SIGNAL TRANSMISSION SYSTEM, CONNECTOR APPARATUS, 5 ELECTRONIC DEVICE, AND SIGNAL TRANSMISSION METHOD Technical Field [0001] The present invention relates to a signal transmission system, a connector 10 apparatus, an electronic device, and a signal transmission method. Background Art [00021 When a signal is transmitted from one device to the other device, signal 15 transmission (including power supply) may be performed through a connector. [0003] In this case, when electrical connection is performed through the connector, there are standards in a casing shape and a signal interface including a terminal unit and a fitting structure and electrical and mechanical interfaces of one device and the 20 other device are defined according to the standards. [0004] For example, recently, downsizing of electronic devices such as a mobile phone, a PDA, a video camera, and a digital camera has progressed and new interfaces that enable high-speed transmission have been standardized. In addition, 25 a shape of a small connector has been standardized to correspond to the downsizing of devices such as a mini-USB and an HDMI (High-Definition Multimedia Interface (HDMI) type C, in the individual interface standard (refer to Patent Literature 1). Citation List 30 Patent Literature [0005] Patent Literature 1: Technical Problem [0006] 2/145 JP 2008-277253A Summary of Invention SP263473 WO00 However, when a connection interface is realized by an electrical contact (that is, electrical wiring line) of the terminal unit of the connector, there occur the following problems. [0007] 10 1) In signal transmission using the electrical contact, there are limitations in a transmission speed and a transmission capacity. This is because shapes and placements of connector electrodes designed for old generations are not suitable for a broadband. In order to overcome the limitations, a method using signal shaping techniques such as a cable equalizer, an echo canceller, and a crosstalk canceller is 15 considered. However, if a wider bandwidth is. required (for example, more than 5 Ob/s), it is very difficult to manufacture the connector using the signal shaping techniques. [0008] 2) A method of increasing the number of wiring lines and decreasing a 20 transmission speed per signal line by parallelization of signals is considered to cope with a problem of highspeed data transmission. However, if the method is used, this may increase the number of input/output terminals, which results in deteriorating compatibility with the existing connector. [0009] 25 3) A method of adding a new signal interface for high-speed transmission from USB 2.0 to USB 3.0, separately from the existing signal interface, is also known. However, it is difficult for the method to be applied to the case of a shape of a connector in which it is difficult to add pins under constraints where the pins can be inserted into a connector of a current generation. 30 [0010] The present invention has been made in view of the above circumstances 3/145 SP263473 WO00 and it is an object of the present invention to provide a new structure to realize connection interfaces of signals such as a video signal and a computer image for which high speed and large capacity are required, while resolving at least one of the problems 1) to 3) described above, when a signal interface is realized by connector 5 connection. Solution to Problem [0011] According to one aspect of the present invention in order to achieve the 10 above-mentioned object, there is provided a signal transmission system including a first connector apparatus and a second connector apparatus coupled with the first connector apparatus. In addition, the first connector apparatus and the second connector apparatus are coupled together to form an electromagnetic field coupling unit and a transmission object signal is converted into a radio signal, which is then 15 transmitted through the electromagnetic field coupling unit. [0012] Specifically, the signal transmission system includes a first signal converting unit that executes modulation processing on the basis of the transmission object signal and converts the signal into a high--frequency signal and a second signal 20 converting unit that executes demodulation processing on the basis of a received radio signal and converts the signal into a baseband signal. The first connector apparatus has a first radio coupling unit that is electrically connected to the first signal converting unit and the second connector apparatus has a second radio coupling unit that is electrically connected to the second signal converting unit. 25 [0013] In addition, the first connector apparatus and the second connector apparatus are coupled together to form the electromagnetic field coupling unit between the first radio coupling unit and the second radio coupling unit, the transmission object signal is converted into the high-frequency signal by the first signal converting unit, and a 30 radio signal based on the high-frequency signal is transmitted to the second signal converting unit through the electromagnetic field coupling unit. 4/145 [0014] SP263473 WO00 In short, connector connection of signals is realized by radio transmission using electromagnetic field coupling. Therefore, high-frequency-related constraints of shapes and placements of connector electrodes designed for old generation 5 interfaces can be eliminated and an application of signal shaping techniques is not necessarily required. Advantageous Effects of Invention [0015] According to the present invention, connection interfaces of signals for 10 which high speed and large capacity are required can be realized, different from connection interfaces using contacts. [0016] The present invention can be applied to a connector not having a structural room in which contact pins cannot be additionally provided. The connection 15 interfaces using the contacts can be continuously maintained. In this case, connection interfaces of signals for which high speed and large capacity are required can be realized while backward compatibility with an existing connector is maintained. 20 Brief Description of Drawings [0017] [Fig. 1] Fig. 1 is an illustration of a basic configuration of a signal transmission system according to this embodiment. [Fig. 2] Fig. 2 is an illustration of an entire configuration of a signal transmission 25 system according to a first embodiment (first example). [Fig. 2A] Fig. 2A is an illustration of an entire configuration of a signal transmission system according to the first embodiment (second example). [Fig. 3] Fig. 3 is an illustration of a first example of an electromagnetic field coupling unit. 30 [Fig. 4] Fig. 4 is an illustration of an example of a specific structure of the electromagnetic field coupling unit (1 thereof) according to the first example. 5/145 SP263473WO00 [Fig. 4A] Fig. 4A is an illustration of a specific structure of the electromagnetic field coupling unit (2 thereu j according to the first example. [Fig. 5] Fig. 5 is an illustration of a second example of the electromagnetic field coupling unit. 5 [Fig. 6] Fig. 6 is an illustration (1 thereof) of an example of a specific configuration of the electromagnetic field coupling unit according to the second example. [Fig. 6A] Fig. 6A is an illustration (2 thereof) of an example of a specific configuration of the electromagnetic field coupling unit according to the second example. 10 [Fig. 613] Fig. 6B is an illustration of an example of an application of the electromagnetic field coupling unit according to the second example with respect to an existing connector. [Fig. 7] Fig. 7 is an illustration of a third example of the electromagnetic field coupling unit. 15 [Fig. 8] Fig. 8 is an illustration (1 thereof) of an example of a specific configuration of the electromagnetic field coupling unit according to the third example. [Fig. 8A] Fig. 8A is an illustration (2 thereof) of an example of a specific configuration of the electromagnetic field coupling unit according to the third example. 20 [Fig. 9] Fig. 9 is an illustration of a front end portion (a modulation fractional unit and a demodulation functional unit) of a radio transmission/reception circuit. [Fig. 10] Fig. 10 is an illustration of a configuration of a radio transmission circuit including a radio front end circuit. [Fig. I OA] Fig. l0A is an illustration of an example of a clock frequency of digital 25 image data. [Fig. 11] Fig. 11 is an illustration of a configuration of a radio reception circuit including a radio front end circuit. [Fig. 12] Fig. 12 is an illustration of an example of detailed configurations of a wired reception circuit and a radio transmission circuit each including a radio front end 30 circuit. [Fig. 13] Fig. 13 is an illustration of an example of detailed configurations of a wired 6/145 SP263473 W000 reception circuit and a radio transmission circuit each including a radio front end circuit. ,... [Fig. 14] Fig. 14 is a conceptual illustration of a circuit that performs bidirectional wireless communication. 5 [Fig. 15] Fig. 15 is an illustration of an entire configuration of a signal transmission system according to a first example of a second embodiment. [Fig. 15A] Fig. 15A is an illustration of an entire configuration of a signal transmission system according to a second example of the second embodiment. [Fig. 16] Fig. 16 is an illustration of an entire configuration of a signal transmission 10 system according to a first example of a third embodiment. [Fig. 16A] Fig. 16A is an illustration of an entire configuration of a signal transmission system according to a second example of the third embodiment. [Fig. 17] Fig. 17 is an illustration of a signal transmission system according to a fourth embodiment. 15 [Fig. 18] Fig. 18 is an illustration of a signal transmission system according to a first example of a fifth embodiment. [Fig. 19] Fig. 19 is an illustration of a specific configuration of an electromagnetic field coupling unit according to the fifth embodiment (first example). [Fig. 20] Fig. 20 is an illustration of a signal transmission system according to a 20 second example of the fifth embodiment. [Fig. 21] Fig. 21 is an illustration of an application example of the fifth embodiment. Description of Embodiments [0018] 25 When functional elements are distinguished for each embodiment, reference letters of English capital letters such as A, B, C, .:. are added to the reference signs and the structural elements are added to the reference signs. When the functional elements do not need to be distinguished for each embodiment, the reference letters are omitted. This is applicable to the drawings. 30 [0019] The following description will be made in the order described below. 7/145 SP263473WO00 1. Entire Outline (Basic Concept and Basic Configuration) 2. First Embodiment(Unidirectional Signal Transmission: Transmission using Conducting Wire in Cable) 3. Second Embodiment (Bidirectional Signal Transmission: Transmission using 5 Conducting Wire in Cable) 4. Third Embodiment (Connection Compatibility Detection Mechanism) 5. Fourth Embodiment (Optical Transmission in Cable) 6. Fifth Embodiment (Application with respect to Power Supply Cable) 7. Comparison with Examples 10 [0020] Figs. 2 and 2A are illustrations of an entire configuration of the signal transmission system 1 according to the first embodiment. In the first embodiment, a 30 structure according to this embodiment for performing radio transmission of a broadband signal by the connector unit is applied to unidirectional communication in 20/145 SP263473 WO00 which the signal transmission from the side of the electronic device 2 to the side of the electronic device 8 is performed. In particular; the first embodiment is different from a fourth embodiment to be described below in that unidirectional communication is performed and wired transmission for the broadband signal in the 5 connection cable 4 is performed by an electrical wiring line (conducting wire 9010). [0057] In this case, a configuration of a first example of the first embodiment illustrated in Fig. 2 is an aspect in which the cable unit 40 transmits the narrowband signal and the broadband signal by different wiring lines, respectively. A 10 configuration of a second example of the first embodiment illustrated in Fig. 2A is an aspect in which the cable unit 40 transmits the narrowband signal and the broadband signal by a common wiring line (which is not limited to the electrical wiring line and may include the optical wiring line). Figs. 2 and 2A illustrate a state in which the first electronic device 2 and the second electronic device 8 are connected by the 15 connection cable 4. [0058] [Configuration: First Example] First, the configuration of the first example illustrated in Fig. 2 will be described. The first electronic device 2 includes a broadband information 20 processing unit 200 (broadband information generating unit) and a wireless communication unit 202 (radio transmitting unit). The electronic device 2 includes a narrowband information processing unit 204 (narrowband information generating unit) that processes narrowband data to be an example of a signal not becoming a radio signal transmission object, a clock processing unit 206 (clock generating unit) 25 that processes a clock signal, and a power supply unit 208. The power supply unit 208 has a power supply circuit that supplies power (DC voltage) to the side of the second electronic device 8 through the connection cable 4. [0059] Contact electrodes 23 (contact pins) are provided in the receptacle 22 to 30 perform connection of the narrowband information processing unit 204, the clock processing unit 206, the power supply unit 208, and a reference potential (ground: 21/145 SP263473 WO00 GND) common to each signal with respect to the side of the electronic device 8 by an electrical wiring iine (conducting wire connection). Also, contact electrodes 43 are provided in the plug 42 of the connection cable 4 fitted into the contact electrodes 23 of the receptacle 22. The contact electrodes 23 and the contact electrodes 43 are 5 collectively called contacts. [0060] In order to form the electromagnetic field coupling unit 12 to perform radio signal connection between the wireless communication unit 202 outside the receptacle 22 and the wireless communication unit 402 inside the plug 42, a coupler 10 unit 120 (radio coupling unit) is provided in the receptacle 22 and a coupler unit 125 (radio coupling unit) is provided in the plug 42. [0061] The second electronic device 8 includes a broadband information processing unit 800 (broadband information reproducing unit) and a wireless communication 15 unit 802 (radio receiving unit). The electronic device 8 further includes a narrowband information processing unit 804 (narrowband information reproducing unit) that processes narrowband data to be an example of a signal not becoming a radio signal transmission object, a clock processing unit 806 (clock reproducing unit) that processes a clock signal, and a power supply unit 808. The power supply unit 20 808 has a power stabilization circuit (direct current-direct current conversion circuit: DC-DC converter) that generates stabilized secondary power, on the basis of the power supplied from the side of the first electronic device 2 through the connection cable 4. The power supply unit 808 can use a power stabilization circuit using a reference power supply such as a three-terminal regulator or a Zener diode, A DC 25 voltage that is generated by the power supply unit 208 may be used at the side of the electronic device 8, without providing the power supply unit 808. [0062] Contact electrodes 85 (contact pins) are provided in the receptacle 84 to perform connection of the narrowband information processing unit 804, the clock 30 processing unit 806, the power supply unit 808, and a reference potential (ground: GND) common to each signal with respect to the side of the electronic device 2 by SP263473 WO00 22/145 an electrical wiring line (conducting wire connection). Also, contact electrodes 45 are provided in the plug 44 of the connection cable 4 fitted into the contact electrodes 85 of the receptacle 84. The contact electrodes 45 and the contact electrodes 85 are collectively called contacts. 5 [0063] In order to form the electromagnetic field coupling unit 14 to perform radio signal connection between the wireless communication unit 802 outside the receptacle 84 and the wireless communication unit 602 inside the plug 44, a coupler unit 130 (radio coupling unit) is provided in the receptacle 84 and a coupler unit 135 10 (radio coupling unit) is provided in the plug 44. [0064] Detailed configurations of the electromagnetic field coupling unit 12 (the coupler unit 120 and the coupler unit 125) and the electromagnetic field coupling unit 14 (the coupler unit 130 and the coupler unit 135) will be described below. 15 [0065] The contact electrodes (that is, the contact electrode 43 of the plug 42 and the contact electrode 45 of the plug 44) of the connection cable 4 are connected by a conducting wire in the cable unit 40 and the power, the clock signal, and the narrowband signal are transmitted. 20 [0066] In the communication chip 401 in the plug 42, a power supply terminal is connected to a power supply wiring line system between a power supply unit 208 and a power supply unit 808 and a reference terminal is connected to a reference potential wiring line system. A clock signal may be supplied from the clock signal 25 wiring line system between the clock processing unit 206 and the clock processing unit 806 to the communication chip 401, which is not essential. In the communication chip 601 in the plug 44, a power supply terminal is connected to the power supply wiring line system between the power supply unit 208 and the power supply unit 808 and a reference terminal is connected to the reference potential 30 wiring line system. A clock signal may be supplied from the clock signal wiring line system between the clock processing unit 206 and the clock processing unit 806 23/145 to the communication chip 601, which is not essential. [0067] SP263473 W 000 A broadband signal of the side of the electronic device 2 is converted into a radio signal by the wireless communication unit 202 and the radio signal is 5 transmitted to the plug 42 through the electromagnetic field coupling unit 12 (the coupler unit 120 and the coupler unit 125). The radio signal is converted into an electrical signal by the communication chip 401 (wireless communication unit 402) in the plug 42 and the electrical signal is transmitted to the side of the electronic device 8 through the conducting wire 901.0 in the cable unit 40, by the wired 10 communication unit 404. In detail, first, the electrical signal is transmitted to the plug 44 of the side of the electronic device 8, is received by the communication chip 601 (wired communication unit 604) in the plug 44, and is converted into a radio signal by the wireless communication unit 602. 'Then, the radio signal is transmitted to the receptacle 84 through the electromagnetic field coupling unit 14 15 (the coupler unit 130 and the coupler unit 135). The radio signal is converted into an electrical signal by the wireless communication unit 802 of the electronic device 8 and the electrical signal is supplied to the broadband information processing unit 800. [0068] [Configuration: Second Example] 20 Next, focusing on a difference with the first example, the configuration of the second example illustrated in Fig. 2A will be described. The communication chip 401 of the plug 42 has a wired communication unit 406 (wired transmitting unit) and a signal selecting unit 408 (selector). The wired communication unit 406 is connected to the narrowband information processing unit 204 and the clock 25 processing unit 206 of the side of the electronic device 2 through the contact electrode 23 and the contact electrode 43 and receives a narrowband signal and a clock signal. The signal selecting unit 408 selects any one of the electrical signal (broadband signal) converted by the wireless communication unit 402 and the electrical signal (the broadband signal and the clock signal) received by the wired 30 communication unit 406 and supplies the selected signal to the wired communication unit 404. SP263473 WO00 24/145 [0069] The communi ation chip 601 of the plug 44 has a wired communication unit 606 (wired receiving unit). The wired communication unit 604 transmits the broadband signal in the demodulated signal to the wireless communication unit 602 5 and transmits the narrowband signal and the clock signal to the wired communication unit 606. The wired communication unit 606 is connected to the narrowband information processing unit 804 and the clock processing unit 806 of the side of the electronic device 8 through the contact electrode 45 and the contact electrode 85 and transmits the narrowband signal and the clock signal. 10 [0070] In the configuration of the second example described above, the narrowband signal and the clock signal that are input from the side of the electronic device 2 through the contact are received by the wired communication unit 406 in the plug 42, are multiplexed with the broadband signal transmission by the signal selecting unit 15 408 (any one is selected by time division), and are transmitted. In this way, conducting wires for the broadband signal transmission and conducting wires for the narrowband signal transmission or the clock signal transmission can be commonly used and the total number of conducting wires can be decreased. [0071] 20 [Electromagnetic Field Coupling Unit: First Example] Fig. 3 is an illustration of a first example of a radio coupler (the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14). In this case, Fig. 3(1) is an illustration of the electromagnetic field coupling unit 12 that is formed when the receptacle 22 of the first electronic device 2 and the 25 plug 42 of the connection cable 4 are fitted. Fig. 3(2) is an illustration of the electromagnetic field coupling unit 14 that is formed when the receptacle 84 of the second electronic device 8 and the plug 44 of the connection cable 4 are fitted. Here, the case in which unidirectional communication from the side of the signal electronic device 2 to the side of the electronic device 8 is performed in a millimeter 30 waveband will be described. [00721 SP263473 WO00 25/145 The first example is the case in which both the electromagnetic field coupling unit 12 configured using the coupler unit 120 and the coupler unit 125 and the electromagnetic field coupling unit 14 configured using the coupler unit 130 and the coupler unit 135 apply spatial transmission. 5 [0073] For example, as illustrated in Fig. 3(1), in the electromagnetic field coupling unit 12, the coupler unit 120 of the receptacle 22 is configured using a transmission path coupling unit 122 and the transmission path coupling unit 122 is connected to the wireless communication unit 202 (in this example, the radio transmitting unit) 10 through a high-frequency transmission path 121 (microstripline). The coupler unit 125 of the plug 42 is configured using the transmission path coupling unit 127 and the transmission path coupling unit 127 is connected to the wireless communication unit 402 (in this example, the radio receiving unit) through a high-frequency transmission path 126 (microstripline). 15 [0074] As illustrated in Fig. 3(2), in the electromagnetic field coupling unit 14, the coupler unit 130 of the receptacle 84 is configured using a transmission path coupling unit 132 and the transmission path coupling unit 132 is connected to the wireless communication unit 802 (in this example, the radio receiving unit) through a 20 high-frequency transmission path 131. The coupler unit 135 of the plug 44 is configured using a transmission path coupling unit 137 and the transmission path coupling unit 137 is connected to the wireless communication unit 602 (in this example, the radio transmitting unit) through a high-frequency transmission path 136. [0075] 25 The transmission path coupling unit 122 and the transmission path coupling unit 127 come close to each other, when the receptacle 22 and the plug 42 are fitted. In addition, the transmission path coupling unit 132 and the transmission path coupling unit 137 come close to each other, when the receptacle 84 and the plug 44 are fitted. As a result, a millimeter-wave signal (radio signal of a millimeter 30 waveband) is electromagnetically coupled and the millimeter-wave signal is spatially transmitted. That is, the transmission path coupling units come close to each other, SP2634 73 WO00 26/145 when the plug is coupled with the receptacle. As a result, the radio transmission is performed by "electromagnetic field coupling" in a spatial portion that is formed between both sides. [0076] 5 In this case, the "electromagnetic field coupling" means that the spatial transmission is realized by any one of coupling by the capacity, coupling by the magnetic field, and coupling by the electromagnetic field. As an example of the coupling by the capacity or the magnetic field, a positional relation is set such that probe-shaped transmission path coupling units extended from the microstripline 10 overlap by an amount corresponding to a 1/4 wavelength, when a wavelength of a radio signal (in this case, the millimeter-wave signal) is set to a, and the receptacle and the plug are fitted, a resonance is generated between the probe-shaped transmission path coupling units, and the millimeter=wave signal is transmitted. This form is called a "radio transmission using proximity electromagnetic field 15 coupling". In the case of the coupling by the electromagnetic field, a radio signal is transmitted using a transmission path coupling unit having an antenna shape. This form is called a "radio transmission using electromagnetic field coupling based on an antenna". [0077] 20 Fig. 4 is an illustration of an example of a specific structure of the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14 (I thereof: the radio transmission using the proximity electromagnetic field coupling is applied) according to the first example. In this case, Fig. 4 illustrates a state in which the plug is coupled with the receptacle. Hereinafter, the case in which the 25 receptacle 22 and the plug 42 are coupled (that is, the case in which the electromagnetic field coupling unit 12 is formed) will be described. The receptacle 22 is a connector apparatus having a concave shape (Female) and the plug 42 is a connector apparatus having a convex shape (Male). A relation of unevenness may be reversed. 30 [0078] The coupler unit 120 and the coupler unit 125 are formed on a multilayer SP263473 W 000 27/145 substrate (dielectric substrate) formed of a dielectric material and the transmission path coupling unit 127 at forms the coupler unit 125 is provided on an end face of a terminal of the plug 42. An integrated circuit is mounted on the same dielectric substrate, a cable conducting wire is connected, and a circuit in the receptacle or a circuit in the plug is configured. [0079] For example, each contact electrode 23 (a broadband signal pin, a narrowband signal pin, a power supply pin, and a shield/GND pin) of the receptacle 22 that is attached to the substrate (device substrate 2002) of the electronic device 2 10 is soldered to a circuit pattern not illustrated in the drawings at the side of a back surface of the substrate (device substrate 2002) of the electronic device 2. In the receptacle 22, a dielectric substrate 2004 is provided and the communication chip 201 storing the wireless communication unit 202 is mounted. A predetermined terminal of the communication chip 201 at the side of the broadband information 15 - processing unit 200 is connected to the contact electrode 23 through a circuit pattern 2010. A predetermined terminal of the wireless communication unit 202 of the communication chip 201 is connected to a high-.frequency transmission path 121 that is formed of a circuit pattern. A probe-shaped electromagnetic field coupling unit 122a that forms the coupler unit 120 is formed in a leading end of the circuit pattern 20 (high-frequency transmission path 121). [0080] In the plug 42 of the side of the cable unit 40, a dielectric substrate 4004 is provided and the communication chip 401 storing the wireless communication unit 402 and the wired communication unit 404 is mounted. Among the conducting 25 wires 9010 of the cable unit 40, each conducting wire 9010 for the narrowband signal, the power, and the shield/GND other than the broadband signal is connected to the corresponding contact electrode 43 through the circuit pattern 4010 of the dielectric substrate 4004. The circuit pattern 4010 of the power and the shield/GND is also connected to the communication chip 401. The conducting wire 9010 for the 30 broadband signal in the cable unit 40 is connected to the predetermined terminal of the wired communication unit 404 of the communication chip 401 by the circuit 28/145 SP263473 W000 pattern 4010. The predetermined terminal of the wireless communication unit 402 of the communication chip 401 is connected to a high-frequency transmission path 126 formed of a circuit pattern. A probe-shaped electromagnetic field coupling unit 127a that forms the coupler unit 125 is formed in a leading end of a circuit pattern (high-frequency transmission path 126). [0081] Similar to the existing connector apparatus, in each of the receptacle 22 and the plug 42, a fitting portion is covered with a metal material forming a shield case 2050 and a shield case 4050 (refer to Fig. 8 to be described below). The 10 electromagnetic field coupling unit 127a is formed at the side (outer side) of a terminal surface of the dielectric substrate 4004 at the outside more than the shield case 4050 (side of a fitting surface with the receptacle 22) and is covered with an insulation protection film 4020. [0082] 15 If the shield case 4050 of the plug 42 enters the shield case 2050 of the receptacle 22, the coupler units face each other. If the receptacle 22 and the plug 42 are fitted at the regulation position and the electromagnetic field coupling unit 122a and the electromagnetic field coupling unit 127a face each other, the electromagnetic field coupling unit 122a and the electromagnetic field coupling unit 127a having the 20 probe shape overlap by an amount corresponding to a X/4 wavelength, a resonance is generated (thereby, the electromagnetic field coupling unit 12 is formed), and the millimeter-wave is transmitted. [0083] Fig. 4A is an illustration of an example of a specific structure of the 25 electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14 (2 thereof: the radio transmission using the electromagnetic field coupling based on the antenna is applied) according to the first example. Fig. 4A illustrates a state in which the plug is coupled with the receptacle. Hereinafter, focusing on a difference with the structure example illustrated in Fig. 4 in which the "radio transmission using 30 the proximity electromagnetic field coupling" is applied, explanation is given. [0084] 29/145 SP263473WO00 The antenna that forms the coupler unit 120 and the coupler unit 125 is disposed on an inner urface of the shield case of each of the receptacle 22 and the plug 42 and the millimeter wave transmission is performed through a space formed when the connectors are coupled. For example, the receptacle 22 includes an 5 antenna coupling unit 122b, instead of the probe-shaped electromagnetic field coupling unit 122a, and the plug 42 includes an antenna coupling unit 127b, instead of the probe-shaped electromagnetic field coupling unit 127a. A waveguide 2040 made of a space is formed between the antenna coupling unit 122b and a casing (mold) of the receptacle 22 and a waveguide 4040 made of a space is formed 10 between the antenna coupling unit 127b and a casing (mold) of the plug 42. The waveguide 2040 and the waveguide 4040 are not made of the space and a dielectric material that is suitable for radio transmission in a millimeter waveband may be filled into the waveguide 2040 and the waveguide 4040. [0085] 15 The antenna coupling unit 122h and the antenna coupling unit 127b may be formed of circuit patterns of the dielectric substrate 2004 and the dielectric substrate 4004. In an example illustrated in the drawings, inverse F antermas that function as antennas having directivity in a transverse direction are used as the antenna coupling unit 122b and the antenna coupling unit 127b. However, it is not essential to use 20 the inverse F antennas and other antennas such as a monopole antenna, a dipole antenna, and a Yagi antenna may be used. [0086] If the shield case 4050 of the plug 42 enters the shield case 2050 of the receptacle 22, the coupler units face each other. When the receptacle 22 and the 25 plug 42 are fitted at a regular position, a millimeter-wave signal transmission path 9 (including the waveguide 2040 and the waveguide 4040) that uses air as a medium is formed and the electromagnetic field coupling unit 12 is formed. [0087] It is preferable to make a structure of a transmission path, such that both 30 ends of the millimeter=wave signal transmission path 9 configured using the waveguide 2040 and the waveguide 4040 open or short-circuit in terms of 30/145 SP263473 WO00 electromagnetism. A reflector may be mounted to each of a transmission side and a reception side of the HLLlime ter-wave signal transmission path 9 configured using the waveguide 2040 and the waveguide 4040, so that an advancement direction of a millimeter wave radiated to the side of the millimeter-wave signal transmission path 5 9 (the waveguide 2040 and the waveguide 4040) by the antenna coupling unit 122b and the antenna coupling unit 127b is converted into an extension direction of the millimeter-wave signal transmission path 9. In this case, the millimeter wave (electromagnetic wave) that is radiated by the antenna coupling unit (122b or 127b) of one communication chip (201 or 401) advances in a thickness direction of the 10 millimeter-wave signal transmission path 9. Then, the electromagnetic wave is reflected by the reflector of the transmission side and advances in the extension direction of the millimeter-wave signal transmission path 9. In addition, the electromagnetic wave is reflected by the reflector of the reception side and reaches the antenna coupling units (122b and 1271h) of the other semiconductor package. 15 [0088] [Electromagnetic Field Coupling Unit: Second Example] Fig. 5 is an illustration of a second example of a radio coupler (the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14). In this case, Fig. 5(1) is an illustration of the electromagnetic field coupling 20 unit 12 that is formed when the receptacle 22 of the first electronic device 2 and the plug 42 of the connection cable 4 are fitted. Fig. 5(2) is an illustration of the electromagnetic field coupling unit 14 that is formed when the receptacle 84 of the second electronic device 8 and the plug 44 of the connection cable 4 are fitted. Hereinafter, focusing on a difference with the first example, explanation is given. 25 [0089] The second example is the case in which both the electromagnetic field coupling unit 12 configured using the coupler unit 120 and the coupler unit 125 and the electromagnetic held coupling unit 14 configured using the coupler unit 130 and the coupler unit 135 perform radio transmission through the waveguide. That is, a 30 portion between the plug and the receptacle is relayed by the waveguide coupling unit and the waveguide. A coupler structure is configured using the waveguide and 31/145 SP263473 WO00 the waveguide coupling unit, the waveguide and the waveguide coupling unit are integrated when the plig is coupled with the receptacle, and the radio transmission is realized. [0090] 5 For example, as illustrated in Fig. 5(1), in the electromagnetic field coupling unit 12, the coupler unit 120 of the second example of the receptacle 22 is configured using a waveguide coupling unit 123 and the waveguide coupling unit 123 is connected to the wireless communication unit 202 (in this example, the radio transmitting unit) through a high-frequency transmission path 121. The coupler 10 unit 125 of the second example of the plug 42 is configured using the waveguide coupling unit 128 and the waveguide 129 and the waveguide coupling unit 128 is connected to the wireless communication unit 402 (in this example, the radio receiving unit) through the high-frequency transmission path 126. [0091] 15 As illustrated in Fig. 5(2), in the electromagnetic field coupling. unit 14, the coupler unit 130 of the second example of the receptacle 84 is configured using a waveguide coupling unit 133 and the waveguide coupling unit 133 is connected to the wireless communication unit 802 (in this example, the radio reception circuit) through the high-frequency transmission path 131. The coupler unit 135 of the 20 second example of the plug 44 is configured using the waveguide coupling unit 138 and the waveguide 139 and the waveguide coupling unit 138 is connected to the wireless communication unit 602 (in this example, the radio transmission circuit) through the high-frequency transmission path 136. [0092] 25 The waveguide coupling unit 123 and the waveguide coupling unit 128 are electromagnetically coupled through the waveguide 129, when the plug 42 is fitted into the receptacle 22. In addition, the waveguide coupling unit 133 and the waveguide coupling unit 138 are electromagnetically coupled through the waveguide 139, when the plug 44 is fitted into the receptacle 84. As a result, a millimeter- 30 wave signal (radio signal of a millimeter waveband) is transmitted by wireless. If the radio transmission is performed through the waveguide, radiation of an 32/145 SP263473 WO00 electromagnetic wave can be decreased and the separation of a radio channel can be easily performed. [0093] Figs. 6 and 6A are illustrations of examples of a specific configuration of 5 the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14 to which the second example is applied. In this case, Fig. 6 illustrates a course of coupling a plug with a receptacle (states before and after the plug is coupled with the receptacle) and Fig. 6A illustrates a state in which the plug is coupled with the receptacle. Hereinafter, focusing on a difference with the structure example to 10 which the first example is applied, explanation is given. [0094] At the side of the receptacle 22, the high-frequency transmission path 121 and the probe-shaped electromagnetic field coupling unit 122a forming the coupler unit 120 are formed of a circuit pattern to extend from the communication chip 201, 15 and the structure is similar to the structure to which the "the radio transmission using proximity electromagnetic field coupling" is applied, in the first example. In a portion that faces the insulation protection film 4020 of the plug 42, an insulation protection film 2020 is formed. [0095] 20 As the plug 42, a waveguide in which a cavity is formed in a conducting wall or a waveguide (dielectric waveguide) in which a dielectric material is filled into a cavity portion is use as the waveguide 129, a slot (conductor removal portion: opening) is formed in the waveguide, and the electromagnetic field coupling is performed through a probe extended from a transmission line connected to the 25 wireless communication unit 402. The positions of the probe and the slot are determined such that reflection or attenuation of an electric wave decreases, when a convex portion of the plug 42 is coupled with a concave portion of the receptacle 22. [0096] For example, print patterns are formed in the dielectric substrate 4004, via 30 holes are formed between layers of the print patterns, and the via holes are arranged in a transmission direction, so that a rectangular dielectric waveguide is formed, and SP263473 WO00 33/145 the rectangular dielectric waveguide is used as the waveguide 129. The print patterns and a via hole row function as a conducting wall 4030. The attenuation of the electromagnetic wave of the corresponding frequency can be suppressed by selecting a diameter of the waveguide to be suitable for an electromagnetic wave of a predetermined frequency and the electromagnetic wave can be transmitted. [0097] The waveguide 129 is connected to the wireless communication unit 402 through the waveguide coupling unit 128 and the high-frequency transmission path 126. By using the dielectric substrate 4004 as a structural member of the 10 waveguide, the waveguide 129 can be easily formed. The waveguide coupling unit 128 is formed to have a waveguide structure using slot coupling. That is, an antenna structure based on an application of a small aperture coupling element (such as a slot antenna) is made to function as a coupling portion of the waveguide. [0098] 15 A slot pattern structure formed in the dielectric substrate 4004 of the plug 42 functions as an antenna and directly radiates an electromagnetic wave. The highfrequency transmission path 126 (stripline transmission path) is drawn from the communication chip 401, the probe-shaped electromagnetic field coupling unit 127a exists in an extension shape thereof, an opening (slot 4032a) forming the waveguide 20 coupling unit 128 is formed in the waveguide 129 formed in a part of the dielectric substrate 4004, and a slot pattern structure is configured. [0099] In the millimeter-wave coupling structure described above, the electromagnetic field coupling unit 127a electrically connected to a signal wiring line 25 of the wireless communication unit 402 of the communication chip 401 through the high-frequency transmission path 126 and the slot 4032a (opening) electromagnetically couple the millimeter-wave signal by a millimeter wave transmission medium formed in a resin of the dielectric substrate 4004 between both sides. 'Thereby, the millimeter wave that has been transmitted through the 30 millimeter-wave transmission medium becomes an electromagnetic wave from the slot 4032a, is radiated, and is incident on the waveguide 129. That is, the slot 34/145 SF263473W000 pattern structure functions as the antenna and radiates the electromagnetic wave. The radiated electromagnetic wave is coupled to the waveguide 129 and is propagated through the waveguide 129. [0100] 5 Similar to the waveguide coupling unit 128, the waveguide coupling unit 123 is formed to have a waveguide structure using slot coupling. In detail, the probe-shaped electromagnetic field coupling unit 122a exists on an extension of the high-frequency transmission path 121 (stripline transmission path) drawn from the communication chip 201, when the convex portion of the plug 42 is coupled with the 10 concave portion of the receptacle 22, and the electromagnetic field is coupled between the opening (slot 4032b) of the waveguide 129 formed in the part of the dielectric substrate 4004 and the electromagnetic field coupling unit 122a. [0101] Similar to the waveguide 2040 and the waveguide 4040 of the first example, 15 it is preferable to make a structure of a transmission path, such that both ends of the waveguide 129 (millimeter-wave signal transmission path 9) open or short-circuit in terms of electromagnetism. A reflector may be mounted to each of a transmission side and a reception side of the waveguide 129, so that an advancement direction of a millimeter wave radiated to the side of the waveguide 129 by the slot coupling is 20 converted into an extension direction of the waveguide 129. [0102] Fig. 6B is an illustration of an example of an application of the electromagnetic field coupling unit of the second example with respect to an existing connector. In this case, Fig. 6B(l) is an illustration of a plug leading end of an 25 I-TDMI and Fig. 6B(2) is an illustration of a plug leading end of USB 3.0. In the related art, the plug leading end is covered with a conductor (shield case 4050) to protect an electrical terminal or protect electromagnetic field radiation. A lock mechanism including a combination of a concave portion (concave configuration: void) and a convex portion (convex configuration: protrusion) to lock the plug 42 30 inserted into the receptacle 22 is provided to make joining strong when the receptacle 22 and the plug 42 are coupled. For example, at the side of the plug 42, a fixing 35/145 SP263473 WO00 hole (lock hole 4050) functioning as the concave portion is provided in a conducting wall. Therefore, the yaveguide (waveguide 129) using the shield case 4050 as the conducting wall 4030 or a part of the conducting wall 4030 is configured and the coupler unit 125 (waveguide coupling unit) using the locking hole 4052 as the slot 5 4032b is formed. As a result, the coupler unit 125 can be configured without changing a shape of the plug 42 from the existing shape. [0103] [Electromagnetic Field Coupling Unit: Third Example] Fig. 7 is an illustration of a third example of a radio coupler (the 10 electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14). In this case, Fig. 7(l) is an illustration of the electromagnetic field coupling unit 12 that is formed when the receptacle 22 of the first electronic device 2 and the plug 42 of the connection cable 4 are fitted. Fig. 7(2) is an illustration of the electromagnetic field coupling unit 14 that is formed when the receptacle 84 of the 15 second electronic device 8 and the plug 44 of the connection cable 4 are fitted. Hereinafter, focusing on a difference with the second example, explanation is given. [0104] The third example is the case in which both the electromagnetic field coupling unit 12 configured using the coupler unit 120 and the coupler unit 125 and 20 the electromagnetic field coupling unit 14 configured using the coupler unit 130 and the coupler unit 135 perform radio transmission through a cross-section of the waveguide. That is, a portion between the plug and the receptacle is relayed by the cross-section of the waveguide. A coupler structure is configured using a pair of the waveguide and the waveguide coupling unit, cross-sections of the waveguides come 25 close to each other when the plug is coupled with the receptacle, and the waveguide coupling unit (waveguide joining unit) is formed. Thereby, the radio transmission is realized. [0105] For example, as illustrated in Fig. 7(1), the coupler unit 120 of the third 30 example of the receptacle 22 is configured using the waveguide coupling unit 123 and the waveguide 124 and the coupler unit 125 of the third example of the plug 42 36/145 SP2634 73 WO00 is configured using the waveguide coupling unit 128 and the waveguide 129. As illustrated in Fig. 7(2), tire coupler unit 130 of the third example of the receptacle 84 is configured is configured using the waveguide coupling unit 133 and the waveguide 134 and the coupler unit 135 of the third example of the plug 44 is 5 configured using the waveguide coupling unit 138 and the waveguide 139. Each of the waveguide 124, the waveguide 129, the waveguide 134, and the waveguide 139 is used as the waveguide. [0106] When the receptacle 22 and the plug 42 are fitted, the cross-sections of the 10 waveguides come close to each other and the waveguide coupling unit is formed. In addition, when the receptacle 84 and the plug 44 are fitted, the cross-sections of the waveguides come close to each other and the waveguide joining unit is formed. Asa result, the radio transmission is realized. In a relay portion (waveguide joining unit) of the cross-section of the waveguide, because a transmission mode is the same, 15 movement of the electromagnetic wave is easy and deterioration of a transmission characteristic with respect to a deviation or a gap can be decreased. [0107] Figs. 8 and 8A are illustrations of examples of a specific configuration of the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 20 14 to which the third example is applied. In this case, Figs. 8(1) and (2) illustrate a state before the plug is coupled with the receptacle and Figs. 8A(1) and (2) illustrate a state in which the plug is coupled with the receptacle. Hereinafter, focusing on a difference with the structure example to which the second example is applied, explanation is given. 25 [0108] In the plug 42, first, the high-frequency transmission path 126 and the probe-shaped electromagnetic field coupling unit 127a forming the coupler unit 125 are formed of a circuit pattern to extend from the communication chip 401 and the structure is similar to the structure to which the "the radio transmission using 30 proximity electromagnetic field coupling" is applied, in the first example. Different from the second example, the dielectric substrate 4004 is not used, the conducting 37/145 SP263473 WO00 wall 4030 is buried in a resin mold formed of a dielectric material of the plug 42, and the dielectric wavegu:12 forming the waveguide 129 is formed. In the waveguide 129, a slot 4032 is formed at the side of the waveguide coupling unit 128. However, at the side of the fitting portion with the receptacle 22, the slot is not formed and the 5 cross-section of the dielectric waveguide protrudes. [0109] Similar to the second example, the waveguide coupling unit 128 is formed to have a waveguide structure using the slot coupling, by a part of the waveguide 129. That is, the probe-shaped electromagnetic field coupling unit 172a exists on an 10 extension of the high-frequency transmission path 126 (stripline transmission path) drawn from the communication chip 401 and the electromagnetic field is coupled between the slot 4032 of the waveguide 129 formed separately from the dielectric substrate 4004 and the electromagnetic field coupling unit 127a. [0110] 15 Similar to the plug 42, even in the receptacle 22, the high-frequency transmission path 121 and the probe-shaped electromagnetic field coupling unit 122a forming the coupler unit 120 are formed of a circuit pattern to extend from the communication chip 201. The conducting wall 2030 is buried in a resin mold formed of a dielectric material of the receptacle 22 and the dielectric waveguide 20 forming the waveguide. 124 is formed. In the waveguide 124, a slot 2032 is formed at the side of the waveguide coupling unit 123. However, at the side of the fitting portion with the plug 42, the slot is not formed and the cross-section of the dielectric waveguide protrudes. The millimeter-wave transmission path 9 is configured using the waveguide 124 and the waveguide 129. 25 [0111] Similar to the waveguide coupling unit 128, the waveguide coupling unit 123 is formed to have a waveguide structure using the slot coupling, by a part of the waveguide 124. That is, the probe-shaped electromagnetic field coupling unit 122a exists on an extension of the high-frequency transmission path 121 (stripline 30 transmission path) drawn from the communication chip 201 and the electromagnetic field is coupled between the slot 2032 of the waveguide 124 formed separately from SP263473W000 38/145 the dielectric substrate 2004 and the electromagnetic field coupling unit 122a. [0112] The waveguide 124 (waveguide-type coupler) of the receptacle 22 is disposed such that the receptacle 22 and the plug 42 face each other on an extension 5 of the waveguide 129 (waveguide-type coupler) of the plug 42. If the plug 42 is coupled with the receptacle 22, a cross=section of the waveguide 124 of the receptacle 22 and a cross-section of the waveguide 129 of the plug 42 face each other. [0113] Similar to the waveguide 129 of the second example, it is preferable to 10 make a structure of a transmission path, such that an end of the waveguide 124 (millimeter-wave signal transmission path) at the side of the waveguide coupling unit 123 and an end of the waveguide 129 (millimeter-wave signal transmission path) at the side of the waveguide coupling unit 128 open or short-circuit in terms of electromagnetism. A reflector may be mounted to each of a transmission side and a 15 reception side of each of the waveguide 124 and the waveguide 129, so that an advancement direction of a millimeter wave radiated to the sides of the waveguide 124 and the waveguide 129 by the slot coupling is converted into an extension direction of the waveguide 124 and the waveguide 129. [0114] 20 [Front End Portion: First Example] Fig. 9(l) is an illustration of a first example of a front end portion (a modulation functional unit and a demodulation functional unit) of a radio transmission/reception circuit. [0115] 25 A radio transmission circuit 1100 (the wireless communication unit 202 and the wireless communication unit 602 in the first embodiment) has a modulation functional unit 1110 and a transmission amplifying unit 1120. A broadband signal (for example, a 12-bit image signal) that becomes a radio transmission object is supplied to the modulation functional unit 1110. As the modulation functional unit 30 1110, various circuit configurations can be adopted according to modulation methods. For example, if the modulation method is a method of modulating amplitude or a 39/145 SP263473WO00 phase, a configuration including a frequency mixing unit 1112 (mixer circuit) and a transmission-side loc 1 oscillating unit 1114 may be adopted. The corresponding drawing illustrates the case in which an ASIC modulation method is adopted. [0116] 5 The transmission-side local oscillating unit 1114 generates a carrier signal (modulation carrier signal) that is used for modulation. The frequency mixing unit 1112 multiplies (modulates) a carrier of a millimeter waveband generated by the transmission-side local oscillating unit 1114 with the broadband signal, generates a modulation signal of the millimeter waveband, and supplies the modulation signal to 10 the transmission amplifying unit 1120. The modulation signal is amplified by the transmission amplifying unit 1120 and is radiated from a coupler (the coupler unit 120 and the coupler unit 135) of the electromagnetic field coupling unit 14. [0117] The radio reception circuit 3100 (the wireless communication unit 402 and 15 the. wireless communication unit 802 in the first embodiment) has a modulation functional unit 3110, a variable gain type reception amplifying unit 3120, and a binarizing unit 3122. In an example illustrated in the drawing, the binarizing unit 3122 is provided at a rear stage of the frequency mixing unit 3112. However, it is not essential to include the binarizing unit 3122. For example, another functional 20 unit of the rear stage of the frequency mixing unit 3112 may be configured to function as the binarizing unit 3122. [0118] The demodulation functional unit 3110 can adopt various circuit configurations in a range according to the modulation method of the transmission 25 side. Here, the case using the method of demodulating the amplitude or the phase will be described to correspond to the explanation of the modulation functional unit 1110. [0119] The demodulation functional unit 3110 includes a two input type frequency 30 mixing unit 3112 (mixer circuit) and uses a square detection circuit that obtains a detection output proportional to the square of amplitude of (an envelope of) a 40/145 5P263473 WO00 received millimeter-wave signal. Instead of the square detection circuit, a simple envelope detection circuit that does not have a square characteristic may be used. [0120] A millimeter-wave reception signal that is received by the coupler (the 5 coupler unit 125 and the coupler unit 130) is input to the reception amplifying unit 3120 and amplitude adjustment is performed with respect to the millimeter-wave reception signal. Then, the millimeter-wave reception signal is supplied to the demodulation functional unit 3110. The reception signal of which the amplitude has been adjusted is input to two input terminals of the frequency mixing unit 3112 at 10 the same time and a square signal is generated. A high-frequency component of the square signal that is generated by the frequency mixing unit 3112 is removed by a low-pass filter of a filter processing unit not illustrated in the drawings and a waveform (baseband signal) of an input signal that is transmitted from the transmission side is generated and is supplied to the binarizing unit 3122. 15 [0121] In the wireless communication through the coupler (the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14), because the leakage or the interference from other channel is small, broadband communication of a low error rate can be performed by a simple AM modulation circuit and a 20 demodulation circuit of a square detection type. Because propagation loss is very small as compared with propagation loss of the free space transmission, the front end circuit can be configured using a small power saving circuit. [0122] [Front End Portion: Second Example] 25 Fig. 9(2) is an illustration of a second example of a front end portion (a modulation functional unit and a demodulation functional unit) of a radio transmission/reception circuit. The second example is a configuration in which an injection synchronization (injection lock) method is applied to the first example. Hereinafter, focusing on a difference with the first example, explanation is given. 30 [0123] Although not illustrated in the drawings, when the injection synchronization 41/145 SP263473 WO00 method is used, the radio transmission circuit 1100 preferably executes appropriate correction processing in advance with respect to a modulation object signal, such that the injection synchronization at the reception side becomes easy. Typically, the modulation object signal is modulated after a direct-current proximity component of 5 the modulation object signal is suppressed, that is, the modulation object signal is modulated after a DC (direct current) proximity reduction component is suppressed (cut), so that a carrier frequency proximity modulation signal component is minimized and the injection synchronization at the reception side becomes easy. Not only the DC but also the DC proximity component is preferably suppressed. In 10 the case of a digital method, DC free encoding is performed to prevcnl a DC component from being generated by continuation of the same codes. [0124] Together with a signal (modulation signal) modulated in the millimeter waveband, a reference carrier signal that corresponds to a carrier signal used in the 15 modulation and is used as a reference of the injection synchronization at the reception side is preferably transmitted. The reference carrier signal is a signal in which a frequency and a phase (preferably, including amplitude) corresponding to the carrier signal output from the transmission-side local oscillating unit 1114 and used in the modulation are always constant (not changed). Typically, the reference 20 carrier signal is only the carrier signal that is used in the modulation. The referenced carrier signal may be at least synchronized with the carrier signal and is not limited thereto. For example, the reference carrier signal is a signal (for example, a high-frequency signal) of a different frequency synchronized with the carrier signal used in the modulation or a signal of a same frequency. However, the 25 reference carrier signal may be a signal (for example, an orthogonal carrier signal orthogonal to the carrier signal used in the modulation) of a different phase. [0125] The carrier signal may be included in an output signal of the modulation circuit (for example, standard amplitude modulation or ASIA) or the carrier may be 30 suppressed (amplitude modulation of a carrier suppressing method or ASK or PSK), according to the modulation method or the modulation circuit. Therefore, as the SP263473 WO00 42/145 circuit configuration to transmit the reference carrier signal together with the signal modulated in the millimeter waveband from the transmission side, a circuit configuration according to a kind of the reference carrier signal (whether the carrier signal used in the modulation is used as the reference carrier signal), the modulation 5 method, or the modulation circuit may be adopted. [0126] In the radio reception circuit 3100 of the second example that adopts the injection synchronization method, the demodulation functional unit 3110 includes a reception-side local oscillating unit 3114. The radio reception circuit 3100 supplies 10 an injection signal to the reception-side local oscillating unit 3114 and acquires an output signal corresponding to the carrier signal used in the modulation at the transmission side. Typically, the radio reception circuit 3100 acquires an oscillation output signal that is synchronized with the caner signal at the transmission side. The radio reception circuit 3100 multiplies the received millimeter-wave modulation 15 signal and a carrier signal for demodulation (demodulation carrier signal: called reproduction carrier signal) based on the output signal of the reception-side local oscillating unit 3114 by the frequency mixing unit 3112 (performs synchronization detection) and acquires a synchronization detection signal. A high-frequency component of the synchronization detection signal is removed by a filter processing 20 unit not illustrated in the drawings and a waveform (baseband signal) of an input signal that is transmitted from the transmission side is obtained. The other configuration is the same as that of the first example. [0127] The frequency mixing unit 3112 performs frequency conversion (down 25 conversion/demodulation) by the synchronization detection, for example, develops the detection into the orthogonal detection in which a bit error rate characteristic is superior. As a result, an advantage of applying phase modulation or frequency modulation is obtained. [0128] 30 When the reproduction carrier signal based on the output signal of the reception-side local oscillating unit 3114 is supplied to the frequency mixing unit SP263473 WO00 43/145 3112 and is demodulated, a phase difference needs to be considered and a phase adjustment circuit needs to be provided in a synchronization detection system. [0129] In the example illustrated in the drawings, a phase/amplitude adjusting unit 5 3116 that has a function for adjusting injection amplitude as well as a function of the phase adjustment circuit is provided in the demodulation functional unit 3110. The phase adjustment circuit may be applied to an injection signal with respect to the reception-side local oscillating unit 3114 or an output signal of the reception-side local oscillating unit 3114 and may be applied to both sides. The demodulation-side 10 carrier signal generating unit that generates the demodulation carrier signal synchronized with the modulation cannier signal by the reception-side local oscillating unit 3114 and the phase/amplitude adjusting unit 3116 and supplies the demodulation carrier signal to the frequency mixing unit 3112 is configured. [0130] 15 Although not illustrated in the drawings, a direct-current component suppressing unit that removes a direct-current offset component included in a synchronization detection signal, according to a phase of the reference carrier signal synthesized with the modulation signal (specifically, when the modulation signal and the reference carrier signal have the same phases), is provided at a rear stage of the 20 frequency mixing unit 3112. [0131] If a free running oscillation frequency of the reception-side local oscillating unit 3114 is set to to (coo), a central frequency of an injection signal (in the case of the reference carrier signal, a frequency thereof) is set to fi (cwi), an injection voltage 25 with respect to the reception-side local oscillating unit 3 114 is set to Vi, a free running oscillation voltage of the reception-side local oscillating unit 3114 is set to Vo, and a Q value (Quality Factor) is set to Q, when a lock range is shown by a maximum pull-in frequency range Afomax, Afomax is defined by an expression (A). From the expression (A), it can be seen that the Q value affects the lock range and 30 the lock range is widened when the Q value decreases. [0132] SP263473WO00 44/145 Afomax = fo/(2 * Q) * (Vi/Vo) ". 1/sgrt(1 - (Vi/Vo) ^ 2) ... (A) [0133] From the expression (A), it can be seen that the reception-side local oscillating unit 3114 acquiring an oscillation output signal by the injection 5 synchronization can be locked (synchronized) with a component within Afomax in the injection signal, but cannot be locked with a component out of Afornax, and a band-pass effect is obtained. For example, when a modulation signal having a frequency band is supplied to the reception-side local oscillating unit 3114 and an oscillation output signal is obtained by the injection synchronization, an oscillation 10 output signal that is synchronized with an average frequency of the modulation signal (frequency of a carrier signal) is obtained and the component out of Afomax is removed. [0134] When the injection signal is supplied to the reception-side local oscillating 15 unit 3114, as illustrated in the drawings, a method of amplifying the received millimeter-wave signal by the reception amplifying unit 3120 and supplying the millimeter-wave signal as the injection signal to the reception-side local oscillating unit 3114 through the phase/amplitude adjusting unit 3116 is considered. In this case, instead of a large number of frequency components of the modulation signal, a 20 small number of frequency components preferably exist within Afomax. The "reason why the small number of frequency components preferably exist is that the injection synchronization can be performed by appropriately adjusting a signal input level or a frequency, even when the slight frequency components exist. That is, because the frequency components unnecessary for the injection synchronization can 25 be supplied to the reception-side local oscillating unit 3114, it may be difficult to perform the injection synchronization. However, if the transmission side modulates a modulation object signal after suppressing a low-pass component of the modulation object signal (performing DC free encoding) so that there is no modulation signal component in the vicinity of the carrier frequency, a problem does not occur in the 30 configuration illustrated in the drawings. [0135] 45/145 SP2634 73 WO00 Although not illustrated in the drawings, a frequency separating unit may be provided between the reception amplifying unit 3120 and the demodulation functional unit 3110, the modulation signal and the reference carrier signal may be frequency-separated from the received millimeter-wave signal, and the separated 5 reference carrier signal component may be supplied as the injection signal to the reception-side local oscillating unit 3114 through the phase/amplitude adjusting unit 3116. In the configuration described above, because the signal is supplied after the frequency components unnecessary for the injection synchronization are suppressed in advance, the injection synchronization is easily performed. 10 [0136] Although not illustrated in the drawings, each of the system for the injection synchronization and the system for the broadband signal transmission may be configured using a different coupler, preferably, a method of receiving a signal not to cause interference. In the configuration described above, the reference carrier 15 signal of which the amplitude is always constant can be supplied to the receptionside local oscillating unit 3114. Therefore, the configuration described above is called an optimal method from a viewpoint of easy injection synchronization performance. [0137] 20 The millimeter-wave reception signal that is received by the coupler (the coupler unit 125 and the coupler unit 130) is supplied to the frequency mixing unit 3112 and the reception-side local oscillating unit 3114 (through the phase/amplitude adjusting unit 3116) by a divider (branching filter) not illustrated in the drawings. The reception-side local oscillating unit 3114 performs the injection synchronization 25 function and outputs a reproduction carrier signal synchronized with the carrier signal used in the modulation at the transmission side. [0138] An injection level (amplitude level of the reference carrier signal input to the oscillation circuit of the injection synchronization method), a modulation method, 30 a data rate, and a carrier frequency are associated with whether the injection synchronization is performed at the reception side (the reproduction carrier signal SP263473 WO00 46/145 synchronized with the carrier signal used in the modulation at the transmission side can be acquired. In tie modulation signal, it is important to decrease components in an injection synchronization enabled band. For this reason, the DC free encoding is preferably performed at the transmission side, so that a central (average) frequency 5 of the modulation signal becomes almost equal to the carrier frequency and a central (average) phase becomes almost equal to zero (original point on a phase plane). [0139] For example, the lock range is controlled by controlling the injection voltage Vi or the free running oscillation frequency to, on the basis of the expression 10 (A). In other words, it becomes important to adjust the injection voltage Vi or the free running oscillation frequency to, such that the injection synchronization is performed. The injection synchronization control unit 3130 is provided at the rear stage of the frequency mixing unit 3112 (for example, a rear stage of a direct-current component suppressing unit not illustrated in the drawings), a state of the injection 15 synchronization is determined on the basis of the synchronization detection signal (baseband signal) acquired by the frequency mixing unit 3112, and each unit of the adjustment object is controlled such that the injection synchronization is performed, on the basis of the determination result. [0140] 20 At that time, one of a handling method at the reception side and a handling method at the transmission side to which information useful for the control (not only the control information but also a detection signal becoming an origin of the control information) are supplied as illustrated by a dotted line in the drawing or both the handling methods can be adopted. In the handling method at the reception side, if 25 the millimeter-wave signal (in particular, a reference carrier signal component) is not transmitted with some strength, the injection synchronization may not be performed at the reception side. For this reason, there is a disadvantage in consumption power or interference tolerance, but there is an advantage in that handling is enabled by only the reception side. Meanwhile, in the handling method at the transmission side, 30 it becomes necessary to transmit information from the reception side to the transmission side. However, there is an advantage in that the millimeter-wave SP263473WO00 47/145 signal can be transmitted with minimum power by which the injection synchronization is performed at the reception side, consumptionpower can be decreased, and the interference tolerance can be improved. [0141] 5 As such, by synchronizing the local oscillators of the transmission and reception sides (the transmission-side local oscillating unit 1114 and the receptionside local oscillating unit 3114) by the injection synchronization method and performing the synchronization detection, data can be transmitted even in a weak radio signal as compared with the free running detection. For this reason, a material 10 or a structure having large loss is allowed with respect to the coupler (the electromagnetic field coupling unit 12 and the electromagnetic field coupling unit 14). [0142] In addition, the transmission side (wireless communication unit 404) of the 15 wired transmission generates (reproduces) a data clock on the basis of the carrier signal reproduced at the radio transmission side (wireless communication unit 402) of a front stage thereof and can use the data clock in transmission signal processing for performing wired transmission by the cable unit 40, which will be described in detail below. That is, even when the wired transmission of the clock is not 20 performed in a state in which the clock is overlapped to the data or is separated from the data, the data clock can be transmitted by the carrier signal. The reception side (wireless communication unit 604) of the wired transmission generates (reproduces) the data clock on the basis of the carrier signal used in the modulation at the radio transmission (wireless communication unit 602) of the rear stage thereof and can use 25 the data clock in reception signal processing for performing the wired transmission by the cable unit 40. [0143] [Baseband Signal -> Radio Transmission] Fig. 10 is an illustration of an example of a detailed configuration of a radio 30 transmission circuit including a radio front end circuit, that is, a functional unit that transmits a broadband signal (baseband signal) generated by the broadband SP263473 WO00 48/145 information processing unit 200 by wireless by the wireless communication unit 202. Fig. 1-0A is an illustratiiou of an example of a clock frequency of digital image data. [0144] The wireless communication unit 202 has the same configuration as that of the radio transmission circuit 1100 (refer to Fig. 9). In this case, explanation of the configuration of the wireless communication unit 202 is omitted. [0145] A broadband information processing unit 200A according to the first embodiment includes a signal processing unit 1200 and a timing signal generating 10 unit 1300. The signal processing unit 1200 has a FIFO memory 1212 to which FIFO (First-In/Fast-Out) is applied, a framer 1214, a code converting unit 1216, and a multiplexer 1218. A broadband signal (for example, 12-bit data of 25 to 600 Mb/s), a write clock (for example, a clock of 25 to 600 MHz), and a read clock from a dividing unit 1310 are input to the FIFO memory 1212. 15 [0146] The FIFO memory 1212 retrieves 12-bit data at 25 to 600 MHz and reads the data in a unit of 8 bits. For example, the FIFO memory 1212 retrieves a broadband signal in synchronization with the write clock and outputs the broadband signal (for example, 8-bit data of 900 Mb/s) in synchronization with the read clock. 20 If an amount of non-read data is less than a constant value, the FIFO memory 1212 outputs an EMPTY signal showing that the amount of non-read data is less than the constant value. The EMPTY signal is supplied to the framer 1214. [0147] The framer 1214 inserts FIFO input data and information regarding a 25 frequency ratio of a clock of 900 MHz into data. For example, the framer 1214 executes known frame processing in synchronization with an operation clock and outputs a broadband signal (for example, 8-bit data of 900 Mb/s). The framer 1214 outputs a NULL signal based on the EMPTY signal. The NULL signal is supplied to the code converting unit 1216. The code converting unit 121.6 is configured 30 using an 8B 1013 conversion circuit and generates a data code having the length of 10 bits or a NULL code and supplies the data code or the NULL code to the multiplexer SP263473 WO00 49/145 1218. [0148] A selection control clock (for example, a clock of 9 GHz) is supplied from the dividing unit 1310 to the multiplexer 1218. The multiplexer 1218 sequentially 5 switches codes supplied from the code converting unit 1216 according to a selection control program and selects the codes. The multiplexer 1218 generates an NRZ signal of 9 Gb/s and supplies the NRZ signal to the frequency mixing unit 1112 of the modulation functional unit 1110. [0149] 10 The timing signal generating unit 1300 generates a timing signal that is used by the broadband information processing unit 200A. The timing signal generating unit 1300 may be configured using any one of timing signal generating units generating various tinning signals and can adopt various circuit configurations. However, the timing signal generating unit 1300 is preferably configured using a 15 PLL (Phase-Locked Loop) or a DLL (Delay=Locked Loop). Hereinafter, the case in which the timing signal generating unit 1300 is configured using the PLL will be described. [0150] The timing signal generating unit 1300 is configured to use the 20 transmission-side local oscillating unit 1114 of the wireless communication unit 202 (radio transmission circuit 1100) as an oscillation circuit and includes a dividing unit 1310, a phase/frequency comparing unit 1320 (PFD), a charge pump unit 1330 (CP), a loop filter unit 1350, and a reference signal generating unit 1370 (REF). [0151] 25 The transmission-side local oscillating unit 1114 may adopt any one of a voltage controlled oscillator (VCO) and a current control oscillator (CCO). Hereinafter, explanation is given on the assumption that the voltage controlled oscillator is adopted, unless the circumstances are exceptional. [0152] 30 The dividing unit 1310 divides an oscillation frequency fvco of an output oscillation signal Vout output from an output terminal of the transmission-side local SP263473 WO00 50/145 oscillating unit 1114 by a, acquires a division oscillation signal Vdev, and supplies the division oscillation signal Vdev to the phase/frequency comparing unit 1320. In this case, a that is a PLL multiple number (also called a division ratio) is a positive integer of 1 or more and may be changed such that of a frequency of the output 5 oscillation signal Vol-it (transmission carrier signal) to be a PLL output clock CK PLL can be changed. [0153] In this configuration example, the dividing unit 1310 has a first dividing unit 1312 that divides a frequency of the output oscillation signal Vout by 6, a second 10 dividing unit 1314 that divides a frequency of an output clock of the first dividing unit 1312 by 10, and a third dividing unit 1316 that divides a frequency of an output clock of the second dividing unit 1314 by N. A total PLL multiple number a of the dividing unit 1310 is "6 * 10 * N". An output clock of the second dividing unit 1314 is used as a read clock of the FIFO memory 1212 and operation clocks of the 15 framer 1214 and the code converting unit 1216. [0154] The phase/frequency comparing unit 1320 compares phases and frequencies of a reference clock REF supplied from the reference signal generating unit 1370 and the division oscillation signal Vdev obtained by dividing the output oscillation signal 20 Vout from the transmission-side local oscillating unit 1114 by the dividing unit 1310 and outputs error signals showing a phase difference and a frequency difference to be comparison results as pulse width modulated UP/DOWN signals. [0155] The charge pump unit 1330 inputs/outputs a driving current (called a charge 25 pump current Icp) according to the UP/DOWN signals output from the phase/frequency comparing unit 1320. For example, the charge pump unit 1330 is configured to include a charge pump inputting/outputting the charge pump current Icp output from the phase/frequency comparing unit 1320 and a current variable current source supplying a bias current Icpbias to the charge pump. 30 [0156] The loop filter unit 1350 is an example of a smoothing unit that smoothes a 51/145 SP263473 W 000 comparison signal output from the phase/frequency comparing unit 1320 through the charge pump 1330. The loop filter unit 1350 that is a low-pass filter integrates the charge pump current Icp generated by the charge pump unit 1330 and generates a loop filter output current lip to control an oscillation frequency feco of the transmission-side local oscillating unit 1114. The loop filter output current lip is used as an oscillation control signal CN_1 of the transmission-side local oscillating unit 1114. [0157] Although not illustrated in the drawings, the loop filter unit 1350 has a 10 capacitor (capacitor element) having a loop filter capacity Cp. By connecting the capacitor and a resistor element having loop filter resistance Rp in series, stability of a loop can be improved. When a configuration including one charge pump is adopted, a configuration including the resistor element is generally adopted. [0158] 15 In the loop filter unit 1350, a voltage signal (called a charge pump voltage Vcp) is generated in one terminal (that is, an input of a voltage/current converting unit) of the loop filter, on the basis of the charge pump current Icp output from the charge pump. Because a charging/discharging operation is performed with respect to the capacitor, the loop filter unit 1350 functions as a low-pass filter showing at 20 least one cutoff frequency to attenuate a frequency component equal to or higher than a predetermined cutoff frequency (called a roll-off frequency or pole) of a comparison result signal from the phase/frequency comparing unit 1320 and smooth an oscillation control signal Vent supplied to the transmission-side local oscillating unit 1114. 25 [0159] An entire operation of the broadband information processing unit 200A is as follows. A transmission carrier signal of 54 GHz that is output from the transmission-side local oscillating unit 1114 of the modulation functional unit 1110 is divided by 6 by the first dividing unit 1312 and becomes a 9 GHz selection control 30 clock of the multiplexer 1218. The 9 GHz selection control clock is further divided by 10 by the second dividing unit 1314 and becomes a 900 MHz operation clock of 52/145 SP263473WO00 the framer 1214 and the code converting unit 1216. The timing signal generating unit 1300 forms a PLL circuit together with the phase/frequency comparing unit 1320, the charge pump unit 1330, and the loop filter unit 1350, such that frequencies and phases of the 900 MHz operation clock and the reference clock REF from the reference signal generating unit 1370 are synchronized with each other. [0160] An RF signal that is obtained by modulating the transmission carrier signal of 54 GHz with a NRZ signal of 9 Gb/s by the frequency mixing unit 1112 drives the coupler unit 120 of the electromagnetic field coupling unit 12 via the transmission 10 amplifying unit 1120. The reason why the transmission carrier signal and the NRZ signal are generated from a VC'O (transmission-side local oscillating unit 1114) for an RF and are synchronized is to decrease the number of PLL components and prevent a characteristic of the modulation functional unit 1110 from being changed by low-frequency beats of the transmission carrier signal and the NRZ signal. 15 [0161] In this example, information that is transmitted from the electronic device 2 is 12-bit data of 25 to 600 Mb/s synchronized with the write clock of 25 to 600 MHz. As such, one of examples in which the frequency changes broadly is R data of RGB data of a digital baseband image. The digital image data has various clock 20 frequencies, as illustrated in Fig. 10A. [0162] In this example, the FIFO memory 1212 and the framer 1214 are used to convert data having a variable rate into NRZ data of 900 Mb/s. The FIFO memory 1212 retrieves input data in a unit of 12 bits by the write clock of 25 to 600 MHz and 25 reads the input data in a unit of 8 bits by the read clock of 900 MHz. At this time, if an amount of non-read data collected in the FIFO memory 1212 is less than a constant value, the FIFO memory 1212 outputs an EMPTY signal. At that time, the framer 1214 outputs a NULL signal. The code converting unit 1216 that has received the FIFO read data. and the NULL signal from the framer 1214 generates a 30 data code having the length of 10 bits or a NULL code. The code is converted into a NRZ signal of 9 Gb/s by the multiplexer 1218 (10: 1 multiplexer) and the NRZ 53/145 SP263473 WO00 signal of 9 Gb/s is supplied to the frequency mixing unit 1112. [0163] [Radio Reception -% Wired Transmission] Fig. I1 is an illustration of an example of a detailed configuration of a radio 5 reception circuit including a radio front end circuit, that is, a functional unit (communication chip 401) that transmits broadband information demodulated by the wireless communication unit 402 by wire by the wired communication unit 404. [0164] The wireless communication unit 402 has the same configuration as that of 10 the radio reception circuit 3100 adopting an injection synchronization method (refer to Fig. 9(2)). In this case, explanation of the configuration of the wireless communication unit 402 is omitted. [0165] A wired communication unit 404A according to the first embodiment 15 transmits a broadband signal demodulated by the wireless communication unit 402 by the connection cable 4 (cable unit 40). At this time, the cable cunt 40 may be driven without changing a frequency of the demodulated broadband signal. However, when the frequency of the demodulated broadband signal is higher than a correspondence frequency of the existing cable, it is preferable to divide the 20 broadband signal into a plurality of signals and decrease the frequency. In order to correspond to highspeed transmission of the transmission data, a configuration to increase the number of wiring lines and decrease a transmission speed per signal line by parallelization of signals, that is, a configuration corresponding to a broadband data transmission through multichannel communication is used. Hereinafter, the 25 configuration corresponding to the broadband data transmission through the multichannel communication will be described. [0166] The wired communication unit 404A includes a signal processing unit 3200 and a timing signal generating unit 3300. The signal processing unit 3200 has an 30 identification circuit 3202, a demultiplexer 3204, a code converting unit 3212, a demultiplexer 3214, a code converting unit 3222, a multiplexer 3234, and a wiring 54/145 driving unit 3240. [0167] SP2634 73 WO00 A retiming clock (for example, a clock of 9 GHz) is supplied from the timing signal generating unit 3300 to the identification circuit 3202 and the 5 demultiplexer 3204. A first operation clock (for example, a clock of 900 MHz) is supplied from the timing signal generating unit 3300 to the code converting unit 3212 and the demultiplexer 3214. A second operation clock (for example, a clock of 300 MHz) of which a speed is slower than that of the first operation clock is supplied from the timing signal generating unit 3300 to the code converting unit 10 3222. An output clock (for example, a clock of 3 GHz) is supplied from the timing signal generating unit 3300 to the demultiplexer 3214. [0168] The identification circuit 3202 retrieves a broadband signal demodulated by the wireless communication unit 402 in synchronization with the retiming clock and 15 supplies the broadband signal to the demultiplexer 3204. The identification circuit 3202 functions as the binarizing unit 3122. [0169] The demultiplexer 3204 divides a broadband signal supplied from the identification circuit 3202 into a plurality of signals (for example, signals of 10 20 systems) in synchronization with the retiming clock, decreases frequencies, and supplies the signals to the code converting unit 3212. [0170] The code converting unit 3212 is configured using a 10B8B conversion circuit and converts data demultiplexed by the demutiplexer 3204 into a data code 25 having the length of 8 bits and supplies the data code to the demultiplexer 3214. The demultiplexer 3214 divides data of a plurality of systems (in this example, 8 systems) supplied from the code converting unit 3212 into a plurality of signals (for example, signals of three systems: a total of 24 systems), decreases frequencies, and supplies the signals to the code converting unit 3222. 30 [0171] The code converting unit 3222 is configured using an 8131013 conversion 55/145 SP263473WO00 circuit and converts data demultiplexed by the demultiplexer 3214 into a data code having the length of 10 bits and supplies the data code to the multiplexer 3234. At this time, the code converting unit 3222 regularly inserts a special code for skew correction into three NRZ signals at the same time. 5 [0172] The multiplexer 3234 sequentially switches the codes supplied from the code converting unit 3222, on the basis of the output clock supplied from the timing signal generating unit 3300, selects the codes, generates signals of a plurality of systems (for example, 3 systems), and supplies the signals to the wiring driving unit l0 3240. [0173] The timing signal generating unit 3300 generates a timing signal that is used by the wired communication unit 404A. The timing signal generating unit 3300 may be any one of timing signal generating units generating various timing signals 15 and can adopt various circuit configurations. However, the timing signal generating unit 3300 is preferably configured using a PLL or a DLL. Hereinafter, the case in which the timing signal generating unit 3300 is configured using the DLL will be described. [0174] 20 The timing signal generating unit 3300 includes a delay synchronizing unit 3310 (DLL) and a dividing unit 3320. The dividing unit 3320 has a first dividing unit 3322 that divides the retiming clock output from the delay synchronizing unit 3310 by 10 and generates a first operation clock (for example, a clock of 900 MHz) and a second dividing unit 3324 that further divides the first operation clock output 25 from the first dividing unit 3322 by 3 and generates a second operation clock (for example, a clock of 300 MHz). [0175] The delay synchronizing unit 3310 is configured to use a reception-side local oscillating unit 3114 of the wireless communication unit 402 (radio reception 30 circuit 3100) as an oscillation circuit and has a dividing unit 3312, a phase comparing unit 3314 (PD), and a phase adjusting unit 3316. 56/145 [0176] SP263473 WO00 The delay synchronizing unit 3310 obtains aretiming clock (for example, a clock of 9 GHz) for the identification circuit 3202 and the demultiplexer 3204 (for 9 Gb/s data) by dividing the demodulation carrier signal (a frequency is 54 GHz) 5 reproduced by the injection synchronization by the wireless communication unit 402 by 6 by the dividing unit 3312. At this time, in order to adjust a phase of the dividing unit 3312 to a phase most suitable for sampling the NRZ data, a phase difference of the NRZ signal demodulated by the wireless communication unit 402 (frequency mixing unit 3112) and the retiming clock output from the phase adjusting 10 unit 3316 is detected by the phase comparing unit 3314 and detected phase difference information is supplied to the phase adjusting unit 3316. [0177] The dividing unit 3312 can adjust the phase of the output signal, under control of the phase adjusting unit 3316. The phase adjusting unit 3316 adjusts the 15 phase of the dividing unit 3312 such that the phase of the retuning clock (in this example, 9 GHz) becomes the most suitable phase, on the basis of the phase difference information detected by the phase comparing unit 3314. [0178] The dividing unit 3312 may be configured as a simple divider and the phase 20 adjusting unit 3316 may be configured as a device in which a plurality of steps of delay elements are arranged. In this case, the phase adjusting unit 3316 adjusts the phase by controlling whether an output of any delay element is used such that the phase of the retiming clock (in this example, 9 GHz) becomes the most suitable phase, on the basis of the phase difference information detected by the phase 25 comparing unit 3314. [0179] An entire operation of the wireless communication unit 402 is as follows. The wireless communication unit 402 uses the signal reproduced by the synchronization injection as the demodulation carrier signal (a frequency is 54 GHz), 30 multiplies the signal with the received RF signal, demodulates the NRZ data of 9 Gb/s, and supplies the data to the identification circuit 3202 of the signal processing SP263473 W 000 57/145 unit 3200. [0180] The data that is sampled by the identification circuit 3202, that is, subjected to retiming is demultiplexed with 1:10 by the demultiplexer 3204, is converted into a 5 signal (10 bits) of 900 Mb/s, and is subjected to lOB8B decoding by the code converting unit 3212. Then, the data is demuitiplexed up to 300 MHz by the demultiplexer 3214, is subjected to 8B10B encoding by the code converting unit 3222, is multiplexed with 10:1 by the multiplexer 3234, is converted into three NRZ signals of 3 Gb/s, and is transmitted by the wiring driving unit 3240 through a 10 conducting wire of the cable unit 40. [0181] [Wired Reception -> Radio Transmission] Fig. 12 is an illustration of an example o'f a detailed configuration of a wired reception circuit and a radio transmission circuit including a radio front end circuit, 15 that is, a functional unit (communication chip 601) that transmits broadband information received by the wired communication unit 604 by wireless by the wireless communication unit 602. [0182] The wireless communication unit 602 has the same configuration as that of 20 the radio transmission circuit 1100 (refer to Fig. 9). In this case, explanation of the configuration of the wireless communication unit 602 is omitted. [0183] The wired communication unit 604A. according to the first embodiment receives the three NRZ signals of 3 Gb/s transmitted by the wired communication 25 unit 404A through the conducting wire of the cable unit 40, multiplexes the signals with 3:1, and generates a NRZ signal of 9 Gb/s. For this reason, the wired communication unit 604A includes a front-stage signal processing unit 5100, a rearstage signal processing unit 5200, and a timing signal generating unit 5300. [0184] 30 The front-stage signal processing unit 5100 is a functional unit that processes the received three NRZ signals of 3 Gb/s and separately includes a 58/145 SP263473 W000 sampling unit 5110 that samples the NRZ signal of 3 Gb/s. The front-stage signal processing unit 5100 further includes one deskewing unit 5150 at a rear stage of the sampling unit 5110. [0185] 5 A waveform equalizing unit 5112 shapes a waveform of the three NRZ signals of 3 Gb/s transmitted through the conducting wire 9010 of the cable unit 40. The identification circuit 5114 retrieves a signal output from the waveform equalizing unit 5112 at the retiming clock (a frequency is 3 GHIz), quantizes the signal in a binary value, and supplies the signal to the demultiplexer 5116. The 10 demultiplexer 5116 divides a broadband signal supplied from the identification circuit 5114 into a plurality of signals (for example, signals of 10 systems) in synchronization with the retiming clock, decreases frequencies, and supplies the signals to the code converting unit 5118. [0186] 15 The deskewing unit 5150 detects a skew between the signals generated by the transmission using the conducting wire of the cable unit 40, on the basis of the special code regularly inserted into the three NRZ signals at the same time by the code converting unit 3222, and corrects the signals to remove the skew. [0187] 20 The rear-stage signal processing unit 5200 is a functional unit that multiplexes the signals of the plurality of systems output from the deskewing unit 5150 of the front-stage signal processing unit 5100 and generates a NRZ signal of 9 Gb/s. The rear-stage signal processing unit 5200 includes a multiplexer 5214, a code converting unit 5216, and a multiplexer 5218. 25 [0188] An operation clock (for example, a clock of 900 MHz) is supplied from the dividing unit 5310 to the multiplexer 5214 and the code converting unit 5216. A highspeed operation clock (for example, a clock of 9 GHz) is supplied from the dividing unit 5310 to the multiplexer 5218. 30 [0189] The multiplexer 5214 sequentially switches the codes supplied from the SP263473 W 000 59/145 deskewing unit 5150 according to a low-speed operation clock, selects the codes, generates NRZ signals of 900 Mb/s, and supplies the signals to the code converting unit 5216. The code converting unit 5216 is configured using an 8B10B conversion circuit and generates a data code having the length of 10 bits and supplies the data 5 code to the multiplexer 5218. The multiplexer 5215 sequentially switches the codes supplied from the code converting unit 5216 according to a high-speed operation clock, selects the codes, generates NRZ signals of 9 Gb/s, and supplies the signals to the frequency mixing unit 1112 of the radio transmission circuit 1100. [0190] 10 The timing signal generating unit 5300 generates a timing signal that is used by the wired communication unit 604A. The timing signal generating unit 5300 may be configured using any one of timing signal generating units generating various timing signals and can adopt various circuit configurations. However, the timing signal generating unit 5300 is preferably configured using a PLL or a DLL. 15 Hereinafter, the case in which the timing signal generating unit 5300 is configured using the PLL will be described. [0191] The timing signal generating unit 5300 is configured to use the transmission-side local oscillating unit 1114 of the wireless communication unit 602 20 (radio transmission circuit 1100) as an oscillation circuit and includes a dividing unit 5310, a phase comparing unit 5320 (PD), a charge pump unit 5330 (CP), and a loop filter unit 5350. [0192] The timing signal generating unit 5300 further includes a phase correcting 25 unit 5360 with respect to two systems of three systems of the front-stage signal processing unit 5100 and includes a dividing unit 5370 separately with respect to all of the systems. The phase correcting unit 5360 is similar to the delay synchronizing unit 3310 and has a phase comparing unit 5364 (PD) and a phase adjusting unit 5366. The phase comparing unit 5320 is configured to function as a phase comparing unit 30 5364 (PD) of one system of the side of the front-stage signal processing unit 5100, in terms of a circuit placement. 60/145 [0193] SP263473 W 000 The dividing unit 5310 has a first dividing unit 5312 that divides a frequency of the output oscillation signal Vout by 6, a second dividing unit 5314 that divides a frequency of an output clock of the first dividing unit 5312 by 3, a third 5 dividing 5316 that divides a frequency of an output clock of the first dividing unit 5312 by 10, and a fourth dividing unit 5318 that divides a frequency of an output clock of the third dividing unit 5316 by 3. [0194] A. transmission carrier signal of 54 GHz that is output from the 10 transmission-side local oscillating unit 1114 of the modulation functional unit 1110 is divided by 6 by the first dividing unit 5312 and becomes a highspeed operation clock (9 GHz selection control clock) of the multiplexer 5218. The 9 GHz selection control clock is further divided by 10 by the third dividing unit 5316 and becomes a low-speed operation clock (900 MHz operation clock) of the multiplexer 5214 and 15 the code converting unit 5216. The low-speed operation clock is further divided by 3 by the fourth dividing unit 5318 and becomes a low-speed operation clock (300 MHz operation clock) of the deskewing unit 5150. [0195] The highspeed operation clock that is output from the first dividing unit 20 5312 is further divided by 3 by the second dividing unit 5314, is supplied as a 3 GHz comparison clock to the phase comparing unit 5320 and the phase correcting unit 5360, and is used as a retiming clock for the identification circuit 5114 and the demultiplexer 5116 of a system not provided with the phase correcting unit 5360. [0196] 25 The timing signal generating unit 5300 forms a PLL circuit together with the phase comparing unit 5320, the charge pump unit 5330, and the loop filter unit 5350, such that frequencies and phases of the 3 GHz comparison clock and the reception signal received by the front-stage signal processing unit 5100 are synchronized with each other. An operation of the timing signal generating unit 5300 is basically 30 similar to the operation of the timing signal generating unit 1300. The operation of the timing signal generating unit 5300 is different from the operation of the timing 61/145 SP263473 WO00 signal generating unit 1300 in that the timing signal generating unit 5300 does not include a functional unit corresponding to the reference signal generating unit 1370 and uses the output signal of the waveform equalizing unit 5112 of the system not provided with the phase correcting unit 5360 of the front stage signal processing unit 5 5100 as a reference clock. [0197] The sampling unit 5110 has a waveform equalizing unit 5112 (EQ: Cable Equalizer) having an amplification function, an identification circuit 5114, a demultiplexer 5116, and a code converting unit 5118. A retiming clock (a 10 frequency is 3 GI-1z) is commonly supplied from the timing signal generating unit 5300 to the identification circuit 5114 and the demultiplexer 5116 of one system. An operation clock that is obtained by dividing the retiming clock (a frequency is 3 GHz) by 10 by the dividing unit 5370 is supplied to the code converting unit 5118 of the corresponding system. A retiming clock (a frequency is 3 GHz) is commonly 15 supplied from the phase correcting unit 5360 to the identification circuit 5114 and the demultiplexer 5116 of the remaining systems (in this example, two systems). An operation clock that is obtained by dividing the retiming clock (a frequency is 3 GHz) from the phase correcting unit 5360 of the same system by 10 by the dividing unit 5370 is supplied to the code converting unit 5118. 20 [0198] A 3 GHz comparison clock is supplied from the second dividing unit 5314 to the phase adjusting unit 5366. The phase adjusting unit 5366 may be a device in which a plurality of steps of delay elements are arranged. The phase adjusting unit 5366 adjusts the phase by controlling whether an output of any delay element is used 25 such that the phase of the retiming clock (in this example, 3 GHz) becomes the most suitable phase, on the basis of the phase difference information detected by the phase comparing unit 5364. [0199] The phase correcting unit 5360 synchronizes a phase of a retiming clock 30 (for example, a clock of 3 GHz) for the identification circuit 5114 and the demultiplexer 5116 (for 3 Gb/s data) with a phase of the reception signal. In 62/145 6P263473 WO00 addition, the frequency synchronization is realized by the timing signal generating unit 5300. In order to adjust a phase of the retiming clock supplied from the timing signal generating unit 5300 to a phase most suitable for sampling the NRZ data, the phase difference of the NRZ signal output from the waveform equalizing unit 5112 5 and the retiming clock output from the phase adjusting unit 5366 is detected by the phase comparing unit 5364 and detected phase difference information is supplied to the phase adjusting unit 5366. The phase adjusting unit 5366 adjusts the phase of the retiming clock, on the basis of the phase difference information detected by the phase comparing unit 5364. 10 [0200] An entire operation of the wired communication unit 604A is as follows. The three NRZ signals of 3 Gb/s transmitted through the conducting wire of the cable unit 40 are first subjected to waveform shaping by the waveform equalizing unit 5112 and are quantized in a binary value at the 3 GHz sampling clocks (retiming 15 clocks). One of the re-3 GHz sampli ng clocks is acquired by the PLL configuration by comparing the shifts and the phases of the received NRZ signals by the phase comparing unit 5320 of the timing signal generating unit 5300 and feeding results back to the transmission-side local oscillating unit 1114. The 3 GHz sampling clocks of the remaining systems are acquired by supplying the 3 GHz sampling clock 20 of one system to (the phase adjusting unit 5366 of) the phase correcting unit 5360 and shifting a phase on the basis of phase difference information (detected by the phase comparing unit 5364) with the NRZ signal of the self system. That is, the shift amount of the phase is adjusted by the phase comparison of each 3 GHz sampling clock and the NRZ signal shift. 25 [0201] The 3 Gb/s signals that are quantized at the 3 GHz sampling clock and are subjected to retiming are decomposed into signals (10 bits ) of 300 Mb/s by the demultiplexer 5116, are converted into 8-bit data by the code converting unit 5118, CLAIMS Claim I A signal transmission system comprising: a first connector apparatus; and 5 a second connector apparatus that is coupled with the first connector apparatus, wherein the first connector apparatus and the second connector apparatus are coupled together to form an electromagnetic field coupling unit, and a transmission object signal is converted into a radio signal, which is then 10 transmitted through the electromagnetic field coupling unit, between the first connector apparatus and the second connector apparatus. Claim 2 The signal transmission system according to claim 1, further comprising: 15 a first signal converting unit that executes modulation processing on the basis of the transmission object signal and converts the signal into a high-frequency signal; and a second signal converting unit that executes demodulation processing on the basis of a received radio signal and converts the signal into a baseband signal, 20 wherein the first connector apparatus has a first radio coupling unit that is electrically connected to the first signal converting unit, the second connector apparatus has a second radio coupling unit that is electrically connected to the second signal converting unit, and the first connector apparatus and the second connector apparatus are 25 coupled together to form the electromagnetic field coupling unit to transmit the radio signal between the first radio coupling unit and the second radio coupling unit, the transmission object signal is converted into the high-frequency signal by the first signal converting unit, and a radio signal based on the high-frequency signal is transmitted to the second signal converting unit through the electromagnetic field 30 coupling unit. 139/145 Claim 3 SP263473 WO00 The signal transmission system according ,to claim 2, wherein the first radio coupling unit has a first transmission path coupling unit connected to the first signal converting unit through a first high-frequency 5 transmission path, the second radio coupling unit has a second transmission path coupling unit connected to the second signal converting unit through a second high-frequency transmission path, and radio transmission is performed in a space between the first transmission 10 path coupling unit and the second transmission path coupling unit that is formed when the first connector apparatus and the second connector apparatus are coupled together. Claim 4 1.5 The signal transmission system according to claim 2, wherein the first radio coupling unit has a first waveguide coupling unit connected to the first signal converting unit through a first high-frequency transmission path, the second radio coupling unit has a waveguide and a second waveguide 20 coupling unit connected to the second signal converting unit through a second highfrequency transmission path, and when the first connector apparatus and the second connector apparatus are coupled together, the first waveguide coupling unit and the second waveguide coupling unit are electromagnetically coupled through the waveguide and radio 25 transmission is performed. Claim 5 The signal transmission system according to claim 2, wherein the first radio coupling unit has a first waveguide and a first 30 waveguide coupling unit connected to the first signal converting unit through a first high-frequency transmission path, 140/145 SP263473 W000 the second radio coupling unit has a second waveguide and a second waveguide coupling unit connected to the second signal converting unit through a second high-frequency transmission path, and when the first connector apparatus and the second connector apparatus are 5 coupled together, a cross-section of the first waveguide in a longitudinal direction and a cross-section of the second waveguide in a longitudinal direction face to form a waveguide joining unit and radio transmission is performed through the waveguide joining unit. 10 Claim 6 The signal transmission system according to claim 1, wherein a signal system that performs signal transmission by an electrical contact between the first connector apparatus and the second connector apparatus, when the first connector apparatus and the second connector apparatus are coupled 15 together, is provided. Claim 7 The signal transmission system according to claim 1, wherein any one of the first connector apparatus and the second connector 20 apparatus is provided in an electronic device, and a power supply system that supplies power when the first connector apparatus is coupled with the second connector apparatus is provided. Claim 8 25 The signal transmission system according to claim 1, further comprising: an electronic device; and a connection cable that performs signal transmission between the electronic device and the connection cable, wherein the electronic device has one of the first connector apparatus and 30 the second connector apparatus, the connection cable has the other of the first connector apparatus and the 141/145 SP263473 WO00 second connector apparatus, and the connectc,: apparatus that is provided in the connection cable has a wired communication unit that performs a conversion of a radio signal and a wired signal transmitted through the connection cable. 5 Claim 9 The signal transmission system according to claim 8, wherein the connection cable has a conducting wire that transmits an electrical signal corresponding to the radio signal; and 10 the wired communication unit generates the electrical signal corresponding to the radio signal, as the wired signal. Claim 10 The signal transmission system according to claim 8, 15 wherein the wired communication unit executes signal processing for decreasing a transmission speed per signal line by parallelization of signals. Claim 11 The signal transmission system according to claim 8, 20 wherein any one of the first connector apparatus and the second connector apparatus is provided in each of a plurality of electronic devices, and the other of the first connector apparatus and the second connector apparatus is provided in both ends of the connection cable. 25 Claim 12 The signal transmission system according to claim 1, wherein the signal transmission system corresponds to bidirectional communication, and one set of electromagnetic field coupling units are shared in each direction 30 of the bidirectional communication. 142/145 SP263473 W 000 Claim 13 The signal transmission system according to claim 12, farther comprising: a direction managing unit that separates a radio signal to be transmitted to the electromagnetic field coupling unit and a radio signal transmitted from the electromagnetic field coupling unit. Claim 14 The signal transmission system according to claim 12, wherein the bidirectional communication is performed using each different 10 carrier frequency, and a frequency selection functional unit corresponding to each different carrier frequency is provided in each reception system of each direction. Claim 15 15 A connector apparatus, wherein the connector apparatus has a coupling structure that is coupled with the other connector apparatus, the connector apparatus has a radio coupling unit that is connected to a signal converting unit to execute modulation processing on the basis of a 20 transmission object signal and convert the signal into a high-frequency signal and execute demodulation processing on the basis of a received radio signal and convert the signal into a baseband signal and transmits the radio signal, and the connector apparatus is coupled with the other connector apparatus to form an electromagnetic field coupling unit between the radio coupling unit and the 25 radio coupling unit of the other connector apparatus. Claim 16 The connector apparatus according to claim 15, further comprising: the signal converting unit. 30 Claim 17 143/145 SP263473W000 The connector apparatus according to claim 15, further comprising: a connection_ sable that performs signal transmission; and a wired communication unit that performs communication using a wired signal through the connection cable and performs a conversion of the wired signal 5 transmitted through the connection cable and a high-frequency signal corresponding to the radio signal. Claim 18 An electronic device comprising: 10 a connector unit that has a coupling structure coupled with (lie other connector apparatus; and a signal converting unit that executes modulation processing on the basis of a transmission object signal and converts the signal into a high-frequency signal and executes demodulation processing on the basis of a received radio signal and 15 converts the signal into a baseband signal, wherein the connector unit has a radio coupling unit that is connected to the signal converting unit and transmits the radio signal, and the connector unit is coupled with the other connector apparatus to form an electromagnetic field coupling unit between the radio coupling unit and the radio 20 coupling unit of the other connector apparatus. Claire 19 The electronic device according to claim 18, further comprising: a connection cable that performs signal transmission between the other 25 connector apparatus and the connection cable; and a wired communication unit that performs communication using a wired signal through the connection cable and performs a conversion of the wired signal transmitted through the connection cable and a high-frequency signal corresponding to the radio signal. 30 Claim 20 144/145 3P263473 WO00 A signal transmission method comprising: using a first onnector apparatus and a second connector apparatus, the first connector apparatus having a first radio coupling unit electrically connected to a first signal converting unit executing modulation processing on the basis of the 5 transmission object signal and converting the signal into a high-frequency signal, the second connector apparatus having a second radio coupling unit electrically connected to a second signal converting unit executing demodulation processing on the basis of a received radio signal and converting the signal into a baseband signal; coupling the first connector apparatus with the second connector apparatus 10 to form an electromagnetic field coupling unit between the first radio coupling unit and the second radio coupling unit; converting the transmission object signal into a high-frequency signal by the first signal converting unit; and transmitting a radio signal based on the high-frequency signal to the second 15 signal converting unit through the electromagnetic field coupling unit.