SP267880WO00 1/46 Description Title of Invention RECEIVING APPARATUS AND RECEIVING METHOD 5 Technical Field [0001] The present disclosure relates to a reception apparatus that receives a broadcasting wave and a reception method used in the receiving apparatus, and more 10 particularly, to technology for receiving a plurality of broadcasting waves of different frequency bands. Background Art [0002] 15 Recently, types of broadcasting schemes (standards) such as terrestrial digital television broadcasting, satellite broadcasting, or the like are diversifying. Also, types of broadcasts (number of channels) handled by one broadcasting scheme are increasing, and thus a frequency band used for transmission of a broadcasting wave is getting wider. Accordingly, a demand to receive various broadcasting 20 schemes or various types of broadcasts using one receiving apparatus is increasing. However, for example, satellite broadcasting and terrestrial digital television broadcasting use very different frequency bands for transmission of broadcasting waves. For this reason, tuners are separately installed for respective broadcasts of such different frequency bands, respectively. This is because, in this way, it is 25 possible to easily implement settings appropriate for receiving respective broadcasting waves, and improve a reception characteristic. [0003] However, when a plurality of tuners are installed, the problems such as an increase in production cost, an increase in device size caused by an increase in circuit 30 mounting area, and an increase in power consumption occur. As a technique of solving these problems, for example, patent literature 1 discloses a technique capable 2/46 SP267880WO00 of achieving communization of circuits by configuring tuner units configured to receive respective broadcasts as one module in a receiving apparatus that receives a broadcasting wave of terrestrial digital broadcasting and a broadcasting wave of BS digital broadcasting. 5 Citation List Patent Literature [0004] Patent Literature 1: JP2002-135668A 10 Summary of Invention Technical Problem [0005] However, when respective tuner units configured to receive respective 15 broadcasts (in particular, high frequency processing units referred to as so-called RF front ends) are simply integrated in one module, a size of a receiving circuit increases, and thus the module becomes large. Also, as local oscillators of different oscillation frequencies are mounted on the same module, spurious generated from the respective local oscillators influence each other, and the problem of deterioration of a 20 reception characteristic occurs. [0006] It is desirable to hold down a circuit size as small as possible and also keep a satisfactory reception characteristic in a receiving apparatus that receives a plurality of broadcasting waves of different frequency bands. 25 Solution to Problem [0007] According to a first aspect of the present disclosure, a receiving apparatus includes a first high frequency processing unit, a second high frequency processing 30 unit, and at least one local oscillator, and performing respective functions and processes as follows. The first high frequency processing unit detects a first SP267880WO00 3/46 broadcasting wave transmitted using a first frequency band, and extracts a first high frequency signal. The second high frequency processing unit detects a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal. The at least one local 5 oscillator generates a local oscillation signal used in the first high frequency processing unit and the second high frequency processing unit. [0008] According to a second aspect of the present disclosure, a receiving method is performed in the following sequence. First, a first high frequency processing unit 10 detects a first broadcasting wave transmitted using a first frequency band, and extracts a first high frequency signal. Subsequently, a second high frequency processing unit detects a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal. At least one local oscillator generates a local oscillation signal 15 used in the first high frequency processing unit and the second high frequency processing unit. [0009] By configuring a receiving apparatus and performing a process as described above, it is possible to detect a broadcasting wave using the local oscillation signal 20 oscillated by the at least one local oscillator even when a plurality of high frequency processing units configured to receive a plurality of broadcasting waves of different frequency bands are installed. Advantageous Effects of Invention 25 [0010] According to a receiving apparatus and a receiving method of the present disclosure, even though a plurality of broadcasting waves of different frequency bands are received, when at least one local oscillator is installed therein, a satisfactory result may be obtained. Accordingly, a circuit size of the receiving 30 apparatus is held down as small as possible, and received signals of a plurality of broadcasting waves of different frequency bands are extracted without deteriorating a SP267880WO00 4/46 reception characteristic of the received signals. Brief Description of Drawings [0011] 5 [FIG. 1] FIG. 1 is a block diagram showing a configuration example of a receiving apparatus that performs wave detection using a direct conversion scheme. [FIG. 2] FIG. 2 is a block diagram showing a configuration example of a receiving apparatus that performs wave detection using a super heterodyne scheme. [FIG. 3] FIG. 3 is an explanatory diagram showing an example of requirements 10 necessary for a receiving apparatus. [FIG. 4] FIG. 4 is a block diagram showing a configuration example of a receiving apparatus according to a first embodiment of the present disclosure. [FIG. 5] FIG. 5 is a block diagram showing a configuration example of a PLL unit according to the first embodiment of the present disclosure. 15 [FIG. 6] FIG. 6 is an explanatory diagram showing an example of a baseband conversion process of a high frequency processing unit according to the first embodiment of the present disclosure. [FIG. 7] FIG. 7 is a flowchart showing an example of control by a host CPU according to the first embodiment of the present disclosure. 20 [FIG. 8] FIG. 8 is an explanatory diagram showing an example of a setting made by a host CPU according to the first embodiment of the present disclosure. [FIG. 9] FIG. 9 is a block diagram showing a configuration example of a receiving apparatus according to another embodiment of the present disclosure. [FIG. 10] FIG. 10 is a block diagram showing a configuration example of a receiving 25 apparatus according to a second embodiment of the present disclosure. [FIG. 11] FIG. 11 is a flowchart showing an example of a receiving process of the receiving apparatus according to the second embodiment of the present disclosure. Description of Embodiments 30 [0012] First, technology to be the premise of the present disclosure will be SP267880WO00 5/46 described with reference to FIG. 1 to FIG. 3, and then, a configuration example of a receiving apparatus according to an embodiment of the present disclosure will be described in the following sequence. However, the present disclosure is not limited to an example stated below. 5 1. Example of First Embodiment (example of a configuration for receiving a plurality of broadcasting waves of different broadcasting schemes using a single detection scheme) 1-1. Description of Technology to be Premise 1-2. Configuration Example According to First Embodiment (example 10 configured with one demodulator) 1-3. Various Modified Examples 2. Configuration Example According to Second Embodiment (example of a configuration in which a plurality of high frequency processing units handling a plurality of broadcasting waves of different broadcasting schemes share one local 15 oscillator) [0013] [1. Example of First Embodiment] <1 -1. Technology to be Premise of This Embodiment Currently, detection (demodulation) of a broadcasting wave of satellite 20 broadcasting is performed using a scheme referred to as a "direct conversion scheme." In the direct conversion scheme, a baseband signal is directly extracted from a received broadcasting wave. Detection of terrestrial digital broadcasting or cable television broadcasting is performed using a scheme referred to as a "super heterodyne scheme." In the super heterodyne scheme, a frequency of a received 25 radio wave is converted into a specific intermediate frequency (IF) and then detected. [0014] FIG. 1 shows a configuration example of a receiving apparatus 5 when wave detection is performed using the direct conversion scheme. The receiving apparatus 5 has a parabola antenna 10, a high frequency processing unit 500, and an Integrated 30 Services Digital Broadcasting-Satellite (ISDB-S) demodulator 520. The high frequency processing unit 500 has an automatic gain control (AGC) amplifier 501 6/46 SP267880WO00 serving as a low noise amplifier, an I/Q mixer 502, an I/Q mixer 503, a PLL unit 510 serving as a local oscillator, a phase shifter 504, a variable Low Pass Filter (LPF) 505, a variable LPF 506, a baseband amplifier 507, and a baseband amplifier 508. [0015] 5 The parabola antenna 10 converts a received broadcasting wave of satellite broadcasting into a satellite IF signal, and inputs the obtained satellite IF signal to the AGC amplifier 501 in the high frequency processing unit 500 through a signal line Li 10. The AGC amplifier 501 adjusts the gain of the satellite IF signal input from the signal line Li 10 based on an AGC control signal input from the ISDB-S 10 demodulator 520 through a control line LalO as feedback, and outputs the satellite IF signal whose gain has been adjusted. The satellite IF signal whose gain has been adjusted by the AGC amplifier 501 is input to the I/Q mixer 502 and the I/Q mixer 503. The I/Q mixer 502 mixes the satellite IF signal input from the AGC amplifier 501 and a local signal output from the PLL unit 510, and thereby extracts a baseband 15 signal of I phase. The I/Q mixer 503 mixes the satellite IF signal input from the AGC amplifier 501 and the local signal that is output from the PLL unit 510 and whose phase is shifted by 90° by the phase shifter 504, and thereby extracts a baseband signal of Q phase. [0016] 20 The PLL unit 510 includes a voltage controlled oscillator (VCO) 511 and a frequency divider 512. The VCO 511 controls a frequency of an oscillating signal according to a level of a control voltage applied through a loop filter that is not shown in the drawings. In the example of FIG. 1, the VCO 511 oscillates a frequency of a range of 2200 MHz to 4400 MHz. The frequency divider 512 25 divides the frequency oscillated by the VCO 511 by 2 to 4, and inputs the divided frequencies to a phase comparator that is not shown in the drawings. From the phase comparator, an error signal according to a phase difference between an input reference signal and the oscillation signal from the VCO 511 is output. Then, the error signal becomes the direct current control voltage by passing through the loop 30 filter, and is applied to the VCO 511. With this configuration, the oscillation signal (local signal) of a range of 550 MHz to 2200 MHz is generated from the PLL unit SP267880WO00 7/46 510. In other words, a local signal of the same frequency as that of a broadcasting wave of satellite broadcasting (950 MHz to 2150 MHz: in the case of BS/CS broadcasting) is output from the PLL unit 510. [0017] 5 As described above, the local signal output from the PLL unit 510 is mixed with the satellite IF signal by the I/Q mixer 502 and the I/Q mixer 503 and converted into the baseband signals of I phase and Q phase. The baseband signals of I phase and Q phase are input to the variable LPF 505 and the variable LPF 506. The variable LPF 505 limits a frequency of the baseband signal of Q phase to a 10 predetermined band and outputs the frequency of the baseband signal of Q phase, and the variable LPF 506 limits a frequency of the baseband signal of I phase to a predetermined band and outputs the frequency of the baseband signal of I phase. Cut-off frequencies of the variable LPFs 505 and 506 are allowed to be switched in a range of 5 MHz to 36 MHz. The aforementioned setting value of the cut-off 15 frequencies is an example, and in practice, varies according to an occupied bandwidth of a broadcasting wave input to the receiving apparatus 5. [0018] The baseband signal of I phase and the baseband signal of Q phase whose bands are limited by the variable LPF 505 and the variable LPF 506 are output to the 20 baseband amplifier 507 and the baseband amplifier 508, respectively. The baseband amplifier 507 and the baseband amplifier 508 adjust levels of the input baseband signals of I phase/Q phase such that the signal levels of the baseband signals of I phase/Q phase become constant levels, and output the baseband signals of I phase/Q phase whose signal levels have been adjusted to the ISDB-S demodulator 520 via a 25 signal line LolO and a signal line Loll. Adjustment of the levels of the input baseband signals of I phase/Q phase is performed based on the AGC control signal input from the ISDB-S demodulator 520 via the control line LalO. [0019] The ISDB-S demodulator 520 demodulates the input baseband signals using 30 a demodulation scheme according to a modulation scheme adopted by ISDB-S that is broadcasting standards of satellite broadcasting. As the modulation scheme adopted SP267880WO00 8/46 by ISDB-S, there is a scheme such as a quadrature phase shift keying (QPSK) scheme, an 8 phase shift keying (8PSK) scheme, or the like. Also, the ISDB-S demodulator 520 generates the AGC control signal, and supplies the generated AGC control signal to the AGC amplifier 501, the baseband amplifier 507, and the 5 baseband amplifier 508 through the control line LalO. [0020] FIG. 2 is a block diagram showing a configuration example of a receiving apparatus 6 that performs wave detection of terrestrial digital broadcasting using the super heterodyne scheme. The receiving apparatus 6 has a UHF antenna 20, a high 10 frequency processing unit 600, and an Integrated Services Digital Broadcasting- Terrestrial (ISDB-T) demodulator 620. The high frequency processing unit 600 has an AGC amplifier 601, a mixer 602, a local oscillation unit 610, a switch 603, a Band Pass Filter (BPF) 604, and an IF amplifier 605. [0021] 15 A broadcasting wave of terrestrial digital broadcasting received by the UHF antenna 20 (will be referred to as a "terrestrial RF signal" below) is input to the AGC amplifier 601 in the high frequency processing unit 600 via a signal line Li20. Based on an AGC control signal input from the ISDB-T demodulator 620 through a signal line La20, the AGC amplifier 601 amplifies the terrestrial RF signal (radio 20 frequency: high frequency signal) input from the signal line Li20 and outputs the amplified terrestrial RF signal. The terrestrial RF signal amplified by the AGC amplifier 601 is input to the mixer 602. The mixer 602 converts the terrestrial RF signal input from the AGC amplifier 601 into an intermediate frequency (IF) signal using an oscillation signal output from the local oscillation unit 610. The local 25 oscillation unit 610 includes a VCO 611, a VCO 612, and a VCO 613. The VCO 611, the VCO 612, and the VCO 613 each generate oscillation signals having a bandwidth of about 300 MHz, and have different ranges of oscillating frequencies. In the example shown in FIG. 2, the local oscillation unit 610 is configured to generate oscillation signals of a range of 80 MHz to 910 MHz by the VCO 611, the 30 VCO 612, and the VCO 613. [0022] 9/46 SP267880WO00 The switch 603 selects one of the oscillation signals output from the VCO 611, the VCO 612, and the VCO 613 and supplies the selected oscillation signal to the mixer 602. The IF signal obtained at the mixer 602 is input to the BPF 604. The BPF 604 is configured as a fixed BPF or a variable BPF. When the BPF 604 is 5 configured as a fixed BPF, the BPF 604 is configured with three different BPFs whose pass frequencies have been set to 6 MHz, 7 MHz, and 8 MHz, and when the BPF 604 is configured as a variable BPF, the BPF 604 is configured with a BPF whose pass frequency is switched in a range of 6 MHz to 8 MHz. The IF signal whose band is limited to one band of 6 MHz to 8 MHz by the BPF 604 is input to the 10 IF amplifier 605. Based on the AGC control signal input from the ISDB-T demodulator 620 through the signal line La20, the IF amplifier 605 adjusts a level of the IF signal to a constant level, and outputs the IF signal having been subjected to level adjustment to the ISDB-T demodulator 620. [0023] 15 The ISDB-T demodulator 620 demodulates the RF signal output from the high frequency processing unit 600 using a demodulation scheme according to a modulation scheme adopted by ISDB-T that is broadcasting standards of terrestrial digital broadcasting. The modulation scheme adopted by an ISDB-T scheme is an Orthogonal Frequency Division Multiplexing (OFDM) scheme, an 8-level vestigial 20 sideband modulation (8VSB) scheme, or the like. An OFDM subcarrier modulation scheme is a Quadriphase PSK (QPSK) scheme, a 16 quadrature amplitude modulation (16QAM) scheme, a 64QAM scheme, or the like. Also, the ISDB-T demodulator 620 generates the AGC control signal, and supplies the generated AGC control signal to the AGC amplifier 601 and the IF amplifier 605 through the signal 25 line La20. [0024] Next, environments in which configurations of the receiving apparatus 5 configured to receive satellite broadcasting and the receiving apparatus 6 configured to receive terrestrial digital broadcasting become those shown in FIG. 1 and FIG. 2 30 will be described with reference to a table of FIG. 3. The table of FIG. 3 shows difference between requirements necessary for respective receiving apparatuses. SP267880WO00 10/46 The requirements include "Input frequency to receiving apparatus," "Occupied bandwidth of modulated wave," "Input signal level," "Minimum VCO (PLL) step frequency," "VCO (PLL) phase noise," and "Frequency division ratio." With regard to each item, comparison is made between the receiving apparatus 5 5 configured to receive satellite broadcasting and the receiving apparatus 6 configured to receive terrestrial digital broadcasting. Since specifications necessary for a receiving apparatus of cable television broadcasting is substantially the same as those necessary for a receiving apparatus of terrestrial digital broadcasting, the two broadcasting schemes of terrestrial digital broadcasting and cable television 10 broadcasting are put in the same category. [0025] An input frequency to the receiving apparatus 5 configured to receive satellite broadcasting is 950 MHz to 2150 MHz, and an input frequency to the receiving apparatus 6 of terrestrial digital broadcasting or cable television 15 broadcasting is 44 MHz to 870 MHz. In other words, it is possible to know that a frequency band used to transmit a broadcasting wave of satellite broadcasting is higher than a frequency band used to transmit a broadcasting wave of terrestrial digital broadcasting or cable television broadcasting. An occupied bandwidth of a modulated wave is 20 MHz to 40 MHz in satellite broadcasting, and 6 MHz, 7 MHz, 20 and 8 MHz in terrestrial digital broadcasting or cable television broadcasting (however, only 6 MHz is used in Japanese cable television broadcasting). In other words, it is possible to know that an occupied bandwidth of a modulated wave of satellite broadcasting is wide, and an occupied bandwidth of a modulated wave of terrestrial digital broadcasting or cable television broadcasting is very small. 25 [0026] For this reason, a minimum step frequency of a VCO (PLL) may be 500 kHz to 1 MHz, that is, rather wide, in the receiving apparatus 5 configured to receive satellite broadcasting. On the other hand, in the receiving apparatus 6 configured to receive terrestrial digital broadcasting or cable television broadcasting, it is necessary 30 to change an output frequency of a VCO with a small step width of 125 MHz to 166.7 MHz. 0 SP267880WO00 11/46 [0027] As a phase noise characteristic of a VCO (PLL), only performance of 10 kHz offset (10 kHz apart from a center frequency) or more is important in satellite broadcasting, and performance of 1 kHz offset or less is also important in terrestrial 5 digital broadcasting or cable television broadcasting. [0028] A frequency division ratio of a frequency divider may be small to be about 2 to 4 in the receiving apparatus 5 configured to receive satellite broadcasting when an oscillation frequency of a VCO is set to 2200 MHz to 4400 MHz. For example, the 10 lowest frequency among input frequencies to the receiving apparatus 5 is 950 MHz, and in order to generate a local signal of 950 MHz, an output frequency of the VCO 511 (see FIG. 1) may be set to 1900 MHz and divided by 2 by the frequency divider 512, or may be set to 3800 MHz and divided by 4 by the frequency divider 512. [0029] 15 On the other hand, in the receiving apparatus 6 configured to receive terrestrial digital broadcasting or cable television broadcasting, when oscillation frequencies of the VCO 611 to the VCO 613 are set to 2200 MHz to 4400 MHz that are the same as those configured to receive satellite broadcasting, it is necessary to increase a range of a frequency division ratio to 4 to 64. For example, the lowest 20 frequency among input frequencies to the receiving apparatus 6 is 44 MHz, and in order to generate a local signal of 44 MHz, it is necessary to set an output frequency of the VCO 611 (see FIG. 2) to 2816 MHz and divide the output frequency by 64 by a frequency divider not shown in the drawings. [0030] 25 In order to particularly ensure VCO (PLL) phase noise characteristic among the respective requirements shown in FIG. 3, it is effective not to increase an oscillation frequency of a VCO too high. Therefore, particularly in the receiving apparatus 6 of terrestrial digital broadcasting or cable television broadcasting in which performance of 1 kHz offset or less is also regarded as important, a plurality 30 of VCOs are installed to keep an oscillation frequency of each VCO low as shown in FIG. 3. © SP267880WO00 12/46 [0031] For such a reason, in the receiving apparatus 5 configured to receive satellite broadcasting, the direct conversion scheme whereby it is possible to operate at a higher frequency is adopted. Also, in the receiving apparatus 6 configured to 5 receive terrestrial digital broadcasting or cable television broadcasting, the super heterodyne scheme whereby it is easy to exhibit phase noise performance is adopted. In general, these receiving apparatuses are configured as respective dedicated tuners. Therefore, when circuits of these tuners are simply caused to be used in common for the purpose of reducing the number of parts, receiving characteristics of the tuners 10 are thought to deteriorate. [0032] 5 The embodiment described above is exemplified with a case in which the one demodulator 40 performs demodulation according to various demodulation schemes of different broadcasting standards such as ISDB-T, ISDB-S, and the like, but is not limited to the case. According to types of received broadcasting waves, a plurality of demodulators may be installed. FIG. 9 shows a configuration example 10 of a receiving apparatus l a in which an ISDB-S demodulator 40s (first demodulator) that demodulates a broadcasting wave of satellite broadcasting and an ISDB-T demodulator 40t (second demodulator) that demodulates a broadcasting wave of terrestrial digital broadcasting are separately installed. In FIG. 9, parts corresponding to FIG. 4 are indicated by the same coincidences, and detailed 15 description thereof will be omitted. [0072] In the receiving apparatus l a shown in FIG. 9, each of the ISDB-S demodulator 40s and the ISDB-T demodulator 40t has two input terminals. In addition, a switch 311 and a switch 312 that switch between output points of a 20 baseband amplifier 309 and a baseband amplifier 310 are installed. Further, a switch 313 that switches between output points of an AGC control signal is also installed. Control performed by a host CPU 70 is similar to that shown in FIG. 7. [0073] When a broadcasting wave of satellite broadcasting is received, connection 25 points of the switch 311 and the switch 312 are switched to the ISDB-S demodulator 40s based on control by the host CPU 70. In other words, the baseband amplifier 310 and the baseband amplifier 309 are connected to a signal line Lol and a signal line Lo2 connected with the ISDB-S demodulator 40s. Accordingly, baseband signals of I phase and Q phase extracted from a satellite IF signal are input to the 30 ISDB-S demodulator 40s and demodulated. Also, a connection point of the switch 313 is switched to the ISDB-S demodulator 40s. In other words, an AGC amplifier SP267880WO00 26/46 301, an AGC amplifier 302, the baseband amplifier 309, and the baseband amplifier 310 are connected to a control line Lai connected with the ISDB-S demodulator 40s. Accordingly, an AGC control signal for receiving satellite broadcasting generated by the ISDB-S demodulator 40s is input to the AGC amplifier 301, the AGC amplifier 5 302, the baseband amplifier 309, and the baseband amplifier 310 through the control line Lai. [0074] When a broadcasting wave of terrestrial digital broadcasting is received, the connection points of the switch 311 and the switch 312 are switched to the ISDB-T 10 demodulator 40t based on control by the host CPU 70. In other words, the baseband amplifier 310 and the baseband amplifier 309 are connected to a signal line Lo3 and a signal line Lo4 connected with the ISDB-T demodulator 40t. Accordingly, baseband signals of I phase and Q phase extracted from an RF signal are input to the ISDB-T demodulator 40t and demodulated. Also, the connection 15 point of the switch 313 is switched to the ISDB-T demodulator 40t. In other words, the AGC amplifier 301, the AGC amplifier 302, the baseband amplifier 309, and the baseband amplifier 310 are connected to a control line La2 connected with the ISDBT demodulator 40t. Accordingly, an AGC control signal for receiving terrestrial digital broadcasting generated by the ISDB-T demodulator 40t is input to the AGC 20 amplifier 301, the AGC amplifier 302, the baseband amplifier 309, and the baseband amplifier 310 through the control line La2. [0075] Even with such a configuration, it is possible to obtain similar effects to those obtained in the embodiment described above. In addition, since it is possible 25 to use a conventionally used ISDB-S demodulator and ISDB-T demodulator as they are, production cost of a receiving apparatus is reduced. [0076] FIG. 9 is exemplified with a case of receiving satellite broadcasting and terrestrial digital broadcasting, but is not limited to this combination. It is possible 30 to receive broadcasting waves in various combinations of, for example, satellite broadcasting and cable television broadcasting, satellite and satellite, terrestrial and SP267880WO00 27/46 terrestrial, and the like. [0077] In general, in a receiving apparatus including a plurality of high frequency processing units (tuner units), some of the high frequency processing units are kept 5 electrified and ready to start at all times even when no broadcast is actually received. When high frequency processing units are installed in proportion to types of broadcasting waves to be received or types of combinations, stand-by power consumption that is consumed in such a state becomes too high. However, by configuring the receiving apparatus l a as shown in FIG 9, a one high frequency 10 processing unit 30a can receive a plurality of types of broadcasting waves in various combinations. In other words, stand-by power consumption can be remarkably reduced. [0078] [2. Second Embodiment] 15 <2-1. Configuration Example of Receiving Apparatus> Next, a configuration example of a receiving apparatus 1 p according to a second embodiment of the present disclosure will be described with reference to a block diagram of FIG. 10. In FIG. 10, parts corresponding to FIG. 1, FIG. 2, FIG. 4, and FIG. 9 are denoted by the same symbols, and repeated description thereof will be 20 omitted. [0079] The receiving apparatus ip according to this embodiment has a high frequency processing unit 30s that detects a satellite IF signal using the direct conversion scheme, and a high frequency processing unit 30t that detects a terrestrial 25 RF signal using the super heterodyne scheme. In the configuration, when a broadcast is received, one of the high frequency processing units 30s and 30t is selected by a switch unit 200 serving as a first switch unit. The switch unit 200 includes a switch 201 and a switch 202. The switch 201 turns on or off a connection between an AGC amplifier 301 of the high frequency processing unit 30s 30 on a satellite broadcasting receiving side and a first mixer 304 and a second mixer 305 of the following stage. The switch 202 turns on or off a connection between an SP267880WO00 28/46 AGC amplifier 601 of the high frequency processing unit 30t on a terrestrial digital broadcasting receiving side and a mixer 602 of the following stage. [0080] A switching operation of the switches 201 and 202 by the switch unit 200 is 5 controlled by a host CPU 70 (see FIG. 4 and FIG. 9) serving as a control unit. The host CPU 70 commands the switch unit 200 to perform a switching operation at a timing at which new channel selection data is supplied from a channel selection unit 50, or at other timings. Also, the host CPU 70 controls a high frequency processing unit 30 in which no broadcasting wave is received to enter a power-off mode. 10 [0081] In the power-off mode, electric current is supplied to a block (output amplifier) that outputs a signal to an Analog/Digital (A/D) converter (not shown in the drawings) connected to the following stage among respective blocks configuring a high frequency processing unit 30, and the supply of electric current to the other 15 blocks is interrupted. As the block that outputs a signal to an ADC of the following statge, the baseband amplifiers 309 and 310 of the high frequency processing unit 30s and an IF amplifier 605 of the high frequency processing unit 30t are shown in FIG. 10. [0082] 20 For example, the baseband amplifiers 309 and 310 of the high frequency processing unit 30s and the IF amplifier 605 of the high frequency processing unit 30t are supplied with a predetermined bias voltage at all times, and the bias voltage is output as a DC voltage when the power-off mode is entered. By setting the bias voltage to a value that causes output voltages of these output amplifiers to become a 25 midpoint potential, even in a connection state in which an A/D converter is galvanically and directly connected to the following stage, it is possible to prevent an input terminal of the A/D converter from entering an uncertain state. [0083] In the configuration of the receiving apparatus 1 (3 shown in FIG. 10, a PLL 30 unit 320 serving as a local oscillator is shared by the high frequency processing unit 30s and the high frequency processing unit 30t. Like that shown as in the first 29/46 SP267880WO00 embodiment, the PLL unit 320 is configured with a fractional-N PLL circuit. In this embodiment, output buffer amplifiers that buffer a local oscillation signal output from a frequency divider 322 of the PLL unit 320 are installed to correspond to the number of output points of the local oscillation signal. In this embodiment, the 5 output points of the local oscillation signal are two, that is, the mixers 304 and 305 of the high frequency processing unit 30s and the mixer 602 of the high frequency processing unit 30t. For this reason, the configuration has an output buffer amplifier 701 that buffers a local oscillation signal input to the mixers 304 and 305 of the high frequency processing unit 30s, and an output buffer amplifier 702 that 10 buffers a signal input to the mixer 602 of the high frequency processing unit 30t. In addition, there are a switch 801 that turns on or off a connection between the frequency divider 322 and the mixers 304 and 305, and a switch 802 that turns on or off a connection between the frequency divider 322 and the mixer 602. [0084] 15 One of connection points of a switch unit (second switch unit) 800 including the switches 802 and 802 is selected by the host CPU 70 (see FIG. 4 and the like). The host CPU 70 turns on a switch connected to a mixer of a high frequency processing unit 30 having not been set to the power-off mode, that is, a side receiving a broadcasting wave, and turns off a switch connected to a mixer of a high frequency 20 processing unit 30 having been set to the power-off mode. For example, when satellite broadcasting is received, the switch 801 connected to the mixers 304 and 305 of the high frequency processing unit 30s is turned on, and the switch 802 connected to the mixer 602 of the high frequency processing unit 30t is turned off. [0085] 25 In addition, the host CPU 70 applies a predetermined voltage, for example, 1.5 V or the like, to an output buffer amplifier on a side whose switch is turned on and that is connected with a mixer, and controls an impedance of an output buffer amplifier on a side whose switch is turned off to be a predetermined high value. By performing such control, an overall load becomes 1.5 V at all times when the buffer 30 side is seen from the frequency divider 322. Therefore, even when the power-off mode is entered, and the power of a mixer of any one high frequency processing unit SP267880WO00 30/46 30, that is, an output point of the local oscillation signal, is turned off, an impedance mismatch does not occur between the frequency divider 322 and the mixer. [0086] <2-2. Example of Receiving Process of Receiving Apparatus> 5 Next, an example of a receiving process of the receiving apparatus ip according to this embodiment will be described with reference to the flowchart of FIG. 11. First, the host CPU 70 loads channel selection data (step Sll), and determines whether or not a selected channel is a channel of terrestrial digital broadcasting (step SI2). When the selected channel is a channel of terrestrial 10 digital broadcasting, a connection point of the switch unit 200 serving as the first input switch unit is switched to the high frequency processing unit 30t on the terrestrial digital broadcasting receiving side (step SI3). Then, the high frequency processing unit 30s on the satellite broadcasting receiving side is set to the power-off mode (step SI4), and a process as described above is performed. Subsequently, a 15 VCO output frequency of the PLL unit 320 and a frequency division ratio of the frequency divider 322 are set to appropriate values for receiving terrestrial digital broadcasting (step SI5), and a process of detecting a broadcasting signal, that is, a terrestrial RF signal, is performed (step SI6). [0087] 20 When it is determined in step S12 that the selected channel is a channel of satellite broadcasting, the connection point of the switch unit 200 is switched by the host CPU 70 to the high frequency processing unit 30s on the satellite broadcasting receiving side (step SI7). Then, a control of setting the high frequency processing unit 30t on the terrestrial digital broadcasting receiving side to the power-off mode is 25 performed (step SI8). Subsequently, the VCO output frequency of the PLL unit 320 and the frequency division ratio of the frequency divider 322 are set to appropriate values for receiving satellite broadcasting (step SI9), and a process of detecting a broadcasting signal, that is, a satellite IF signal, is performed (step SI6). After the process is performed thus far, the process returns to step Sll and continues. 30 [0088] According to the embodiment described above, it becomes possible to detect 31/46 SP267880WO00 a broadcasting signal of a wide frequency band from terrestrial digital broadcasting to satellite broadcasting using only one local oscillator configured as a fractional-N type. Accordingly, it is possible to reduce a mounting area of a high frequency processing unit 30 in an IC. 5 [0089] Also, according to the embodiment described above, since a high frequency processing unit 30 that receives no broadcasting signal is put in the power-off mode, and power supply is interrupted, it becomes possible to hold down power consumption. At this time, electric current is supplied to the baseband amplifiers 10 309 and 310 serving as output amplifiers and the IF amplifier 605, and output voltages are controlled to be a predetermined DC voltage (midpoint potential), such that an input terminal of an A/D converter of the following stage is not put in the uncertain state. [0090] 15 Also, according to the embodiment described above, an output of the frequency divider 322 is distributed to correspond to an output point of the output, and a connection point of the output is switched to a high frequency processing unit 30 receiving a broadcasting signal by the switch unit 800 serving as the second switch unit. At this time, a predetermined voltage is applied to an output buffer 20 amplifier to which a switch is connected, and an output buffer amplifier on a side whose switch is turned off is controlled to have a high impedance. Accordingly, even when an output point of a local oscillation signal is switched, the impedance is matched between the output point and the output buffer amplifier, and thus the local oscillation signal is correctly transmitted to a mixer. 25 [0091] In other words, without causing a reception characteristic of a broadcasting signal to deteriorate, it is possible to reduce a circuit size because the number of local oscillators is limited to one. [0092] 30 Also, in the embodiment described above, detection of a broadcasting signal is performed by switching between the high frequency processing unit 30t configured SP267880WO00 32/46 to receive terrestrial digital broadcasting and the high frequency processing unit 30s configured to receive satellite broadcasting. Accordingly, for example, even when there is the existing high frequency processing unit 30t that is used to receive terrestrial digital broadcasting and performs wave detection according to the super 5 heterodyne scheme, the configuration can be kept as it is. After all, it becomes possible to relatively readily perform a process of adding the high frequency processing unit 30s that is used to receive satellite broadcasting and performs wave detection according to the direct conversion scheme to the existing configuration, and other processes. 10 [0093] Also, by installing a plurality of sets of the high frequency processing unit 30s and the high frequency processing unit 30t shown in FIG. 10, it becomes possible to receive broadcasting waves not only in the combination of terrestrial digital broadcasting and satellite broadcasting but also in various combinations. For 15 example, it becomes possible to simultaneously view or record broadcasting programs in combinations of, for example, satellite broadcasting and satellite broadcasting, terrestrial digital broadcasting and terrestrial digital broadcasting, and the like. [0094] 20 The second embodiment described above is exemplified with a case in which a plurality of high frequency processing units 30 receiving a plurality of broadcasting waves of different frequency bands or broadcasting schemes share one local oscillator (the PLL unit 320), but is not limited to this case. A plurality of local oscillators may be installed to correspond to the respective high frequency 25 processing units 30, and in this case, it becomes possible to keep the power consumption of the receiving apparatus 1 low by supplying power to only a local oscillator supplying a local oscillation signal to a high frequency processing unit that is receiving a broadcasting signal. [0095] 30 Also, the second embodiment described above is exemplified with a configuration in which one local oscillator can cover an entire reception frequency 33/46 SP267880WO00 band, but is not limited to this configuration. For example, a configuration in which a plurality of local oscillators are installed to correspond to respective bands configuring the reception frequency band may be applied. [0096] 5 Additionally, the present disclosure may also be configured as below. (1) A receiving apparatus including: a first high frequency processing unit that detects a first broadcasting wave transmitted using a first frequency band, and extracts a first high frequency signal; a second high frequency processing unit that detects a second broadcasting 10 wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal; and at least one local oscillator that generates a local oscillation signal used in the first high frequency processing unit and the second high frequency processing unit. 15 (2) The receiving apparatus according to (1), wherein the at least one local oscillator is configured with a fractional-N PLL circuit. (3) The receiving apparatus according to (1) or (2), including: a first switch unit that switches between the first high frequency processing 20 unit and the second high frequency processing unit; and a control unit that switches a connection point of the first switch unit to a high frequency processing unit receiving a broadcasting wave, wherein the at least one local oscillator supplies the local oscillation signal to the high frequency processing unit selected by the first switch unit between the 25 first high frequency processing unit and the second high frequency processing unit. (4) The receiving apparatus according to (3), wherein the control unit sets a high frequency processing unit not selected by the first switch unit to a power-off mode. (5) The receiving apparatus according to (4), including: 30 a first output amplifier that amplifies the local oscillation signal generated by the local oscillator and outputs the amplified local oscillation signal to the first 34/46 SP267880WO00 high frequency processing unit; and a second output amplifier that amplifies the local oscillation signal and outputs the amplified local oscillation signal to the second high frequency processing unit, 5 wherein, when the power-off mode is set, the control unit performs control of interrupting supply of electric current to processing units other than the first output amplifier or the second output amplifier among respective processing units of the high frequency processing unit set to the power-off mode between the first high frequency processing unit and the second high frequency processing unit. 10 (6) The receiving apparatus according to (4) or (5), wherein the control unit applies a fixed predetermined constant bias voltage to the first output amplifier and the second output amplifier, and wherein, when the power-off mode is set, the control unit causes the bias voltage to an output amplifier set to the power-off mode between the first output 15 amplifier and the second output amplifier to be output as an output voltage from the output amplifier. (7) The receiving apparatus according to any one of (4) to (6), including: a first output buffer amplifier that amplifies the local oscillation signal output from the frequency divider, and outputs the amplified local oscillation signal 20 to the first high frequency processing unit; a second output buffer amplifier that amplifies the local oscillation signal output from the frequency divider, and outputs the amplified local oscillation signal to the second high frequency processing unit; and a second switch unit that selects one of the first output buffer amplifier and 25 the second output buffer amplifier, and connects the selected output buffer amplifier to a circuit of a following stage, wherein, when the power-off mode is set, the control unit performs control of switching a connection point of the second switch unit to an output buffer amplifier connected to the high frequency processing unit receiving the broadcasting 30 wave, and setting an impedance of an output buffer amplifier connected to the high frequency processing unit set to the power-off mode to a predetermined high value. SP267880WO00 35/46 (8) The receiving apparatus according to (1) or (2), wherein at least one of the first frequency band and the second frequency band is a frequency band of satellite broadcasting. (9) The receiving apparatus according to (1) or (2), 5 wherein at least one high frequency processing unit of the first high frequency processing unit and the second high frequency processing unit performs wave detection according to a direct conversion scheme, and wherein the high frequency processing unit performing wave detection according to the direct conversion scheme includes 10 respective low noise amplifiers that correspond to the first high frequency signal and the second high frequency signal, and amplify any high frequency signal between the first high frequency signal and the second high frequency signal, a first mixer that extracts a baseband signal of I phase by mixing the first high frequency signal or the second high frequency signal amplified by the 15 respective low noise amplifiers and the local signal, a second mixer that extracts a baseband signal of Q phase by mixing the first high frequency signal or the second high frequency signal amplified by the low noise amplifiers and a signal obtained by shifting a phase of the local signal by 90°, a first filter that limits a frequency of the baseband signal of I phase to a 20 predetermined band, a second filter that limits a frequency of the baseband signal of Q phase to a predetermined band, a demodulator that demodulates the baseband signal of I phase whose frequency has been limited to the predetermined band by the first filter and the 25 baseband signal of Q phase whose frequency has been limited to the predetermined band by the second filter, and a control unit that sets an oscillation frequency of the local oscillator, a frequency division ratio of a frequency divider in the local oscillator, cut-off frequencies of the first filter and the second filter, and a demodulation scheme of the 30 demodulator based on channel selection information set by a user. (10) The receiving apparatus according to (9), 36/46 SP267880WO00 wherein the first filter and the second filter are configured as a variable low pass filter capable of being set to a given cut-off frequency, wherein a lowest setting value of the cut-off frequency is determined according to a size of an occupied bandwidth of a carrier wave of a broadcasting 5 wave having a lower frequency band between the first broadcasting wave and the second broadcasting wave, and wherein a highest setting value of the cut-off frequency is determined according to the size of the occupied bandwidth of the carrier wave of the broadcasting wave having the lower frequency band between the first broadcasting 10 wave and the second broadcasting wave. (11) The receiving apparatus according to (9) or (10), wherein the local oscillator includes a crystal oscillator, the frequency divider, a phase comparator, a loop filter, and a voltage controlled oscillator, and wherein a lowest setting value of the frequency division ratio of the 15 frequency divider is determined according to a highest frequency value of a frequency band of a broadcasting wave having a higher frequency band between the first broadcasting wave and the second broadcasting wave. (12) The receiving apparatus according to (11), wherein the voltage controlled oscillator of the local oscillator has an LC 20 resonant circuit, and wherein a coil used in the LC resonant circuit is built in an integrated circuit. (13) The receiving apparatus according to any one of (9) to (11), further including: a first switch that switches an output point of the baseband signal of I phase between a first demodulator side and a second demodulator side; and 25 a second switch that switches an output point of the baseband signal of Q phase between a first demodulator side and a second demodulator side, wherein the demodulator includes the first demodulator that performs demodulation according to a modulation scheme used in a first broadcast, and the second demodulator that performs demodulation according to a modulation scheme 30 used in a second broadcast, and wherein the control unit switches connection points of the first switch and 37/46 SP267880WO00 the second switch based on channel selection information set by the user. (14) A receiving method including: detecting, by a first high frequency processing unit, a first broadcasting wave transmitted using a first frequency band, and extracting a first high frequency 5 signal; detecting, by a second high frequency processing unit, a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracting a second high frequency signal; and generating, by at least one local oscillator, a local oscillation signal used in 10 the first high frequency processing unit and the second high frequency processing unit. Reference Signs List [0097] 15 1,5,6 receiving apparatus 10 parabola antenna 20 UHF antenna 30 high frequency processing unit 40 demodulator 20 40s ISDB-S demodulator 40t ISDB-t demodulator 50 channel selection unit 60 storage unit 70 host CPU 25 100 receiving apparatus 101 parabola antenna 102 UHF antenna 110, 120tuner 130 demodulator 30 200 first switch unit 301, 302AGC amplifier 38/46 SP267880WO00 303 switch 304, 305I/Q mixer 306 phase shifter 307, 308variable LPF 309, 31 Obaseband amplifier 311 to 313 switch 320 PLL unit 321 crystal oscillator 322 frequency divider 322n N counter 322r R counter 323 phase comparator 324 loop filter 325 VCO 500 high frequency processing unit 501 AGC amplifier 502, 5031/Q mixer 504 phase shifter 505, 506variable LPF 507 baseband amplifier 510 PLL unit 511 VCO 512 frequency divider 520 ISDB-S demodulator 600 high frequency processing unit 601 AGC amplifier 602 mixer 603 switch 604 BPF 605 IF amplifier 610 local oscillator 39/46 611 to 613 VCO 620 ISDB-T demodulator 701, 702 output buffer amplifier 800 second switch unit 5 801, 802 switch 901 to 906 frequency divider 3201, 3202, 3203 PLL unit Bl to B3 detection block Bwl, Bw2 bandwidth 10 Lai, Lai0, La2, La20 control line Li 1, Li 10, Li2, Li20, Lo 1, Lo2 signal line 40/46 SP267880WO00 CLAIMS Claim 1 A receiving apparatus comprising: a first high frequency processing unit that detects a first broadcasting wave 5 transmitted using a first frequency band, and extracts a first high frequency signal; a second high frequency processing unit that detects a second broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracts a second high frequency signal; and at least one local oscillator that generates a local oscillation signal used in 10 the first high frequency processing unit and the second high frequency processing unit. Claim 2 The receiving apparatus according to claim 1, 15 wherein the at least one local oscillator is configured with a fractional-N PLL circuit. Claim 3 The receiving apparatus according to claim 2, comprising: 20 a first switch unit that switches between the first high frequency processing unit and the second high frequency processing unit; and a control unit that switches a connection point of the first switch unit to a high frequency processing unit receiving a broadcasting wave, wherein the at least one local oscillator supplies the local oscillation signal 25 to the high frequency processing unit selected by the first switch unit between the first high frequency processing unit and the second high frequency processing unit. Claim 4 The receiving apparatus according to claim 3, 30 wherein the control unit sets a high frequency processing unit not selected by the first switch unit to a power-off mode. SP267880WO00 41/46 Claim 5 The receiving apparatus according to claim 4, comprising: a first output amplifier that amplifies the local oscillation signal generated 5 by the local oscillator and outputs the amplified local oscillation signal to the first high frequency processing unit; and a second output amplifier that amplifies the local oscillation signal and outputs the amplified local oscillation signal to the second high frequency processing unit, 10 wherein, when the power-off mode is set, the control unit performs control of interrupting supply of electric current to processing units other than the first output amplifier or the second output amplifier among respective processing units of the high frequency processing unit set to the power-off mode between the first high frequency processing unit and the second high frequency processing unit. 15 Claim 6 The receiving apparatus according to claim 5, wherein the control unit applies a fixed predetermined constant bias voltage to the first output amplifier and the second output amplifier, and 20 wherein, when the power-off mode is set, the control unit causes the bias voltage to an output amplifier set to the power-off mode between the first output amplifier and the second output amplifier to be output as an output voltage from the output amplifier. 25 Claim 7 The receiving apparatus according to claim 6, comprising: a first output buffer amplifier that amplifies the local oscillation signal output from a frequency divider in the local oscillator, and outputs the amplified local oscillation signal to the first high frequency processing unit; 30 a second output buffer amplifier that amplifies the local oscillation signal output from the frequency divider, and outputs the amplified local oscillation signal SP267880WO00 42/46 to the second high frequency processing unit; and a second switch unit that selects one of the first output buffer amplifier and the second output buffer amplifier, and connects the selected output buffer amplifier to a circuit of a following stage, 5 wherein, when the power-off mode is set, the control unit performs control of switching a connection point of the second switch unit to an output buffer amplifier connected to the high frequency processing unit receiving the broadcasting wave, and setting an impedance of an output buffer amplifier connected to the high frequency processing unit set to the power-off mode to a predetermined high value. 10 Claim 8 The receiving apparatus according to claim 2, wherein at least one of the first frequency band and the second frequency band is a frequency band of satellite broadcasting. 15 Claim 9 The receiving apparatus according to claim 2, wherein at least one high frequency processing unit of the first high frequency processing unit and the second high frequency processing unit performs 20 wave detection according to a direct conversion scheme, and wherein the high frequency processing unit performing wave detection according to the direct conversion scheme includes respective low noise amplifiers that correspond to the first high frequency signal and the second high frequency signal, and amplify any high frequency signal 25 between the first high frequency signal and the second high frequency signal, a first mixer that extracts a baseband signal of I phase by mixing the first high frequency signal or the second high frequency signal amplified by the respective low noise amplifiers and a local signal, a second mixer that extracts a baseband signal of Q phase by mixing the 30 first high frequency signal or the second high frequency signal amplified by the low noise amplifiers and a signal obtained by shifting a phase of the local signal by 90°, SP267880WO00 43/46 a first filter that limits a frequency of the baseband signal of I phase to a predetermined band, a second filter that limits a frequency of the baseband signal of Q phase to a predetermined band, 5 a demodulator that demodulates the baseband signal of I phase whose frequency has been limited to the predetermined band by the first filter and the baseband signal of Q phase whose frequency has been limited to the predetermined band by the second filter, and a control unit that sets an oscillation frequency of the local oscillator, a 10 frequency division ratio of a frequency divider in the local oscillator, cut-off frequencies of the first filter and the second filter, and a demodulation scheme of the demodulator based on channel selection information set by a user. Claim 10 15 The receiving apparatus according to claim 9, wherein the first filter and the second filter are configured as a variable low pass filter capable of being set to a given cut-off frequency, wherein a lowest setting value of the cut-off frequency is determined according to a size of an occupied bandwidth of a carrier wave of a broadcasting 20 wave having a lower frequency band between the first broadcasting wave and the second broadcasting wave, and wherein a highest setting value of the cut-off frequency is determined according to the size of the occupied bandwidth of the carrier wave of the broadcasting wave having the lower frequency band between the first broadcasting 25 wave and the second broadcasting wave. Claim 11 The receiving apparatus according to claim 10, wherein the local oscillator includes a crystal oscillator, the frequency 30 divider, a phase comparator, a loop filter, and a voltage controlled oscillator, and wherein a lowest setting value of the frequency division ratio of the SP267880WO00 44/46 frequency divider is determined according to a highest frequency value of a frequency band of a broadcasting wave having a higher frequency band between the first broadcasting wave and the second broadcasting wave. 5 Claim 12 The receiving apparatus according to claim 11, wherein the voltage controlled oscillator of the local oscillator has an LC resonant circuit, and wherein a coil used in the LC resonant circuit is built in an integrated circuit. 10 Claim 13 The receiving apparatus according to claim 11, further comprising: a first switch that switches an output point of the baseband signal of I phase between a first demodulator side and a second demodulator side; and 15 a second switch that switches an output point of the baseband signal of Q phase between a first demodulator side and a second demodulator side, wherein the demodulator includes the first demodulator that performs demodulation according to a modulation scheme used in a first broadcast, and the second demodulator that performs demodulation according to a modulation scheme 20 used in a second broadcast, and wherein the control unit switches connection points of the first switch and the second switch based on channel selection information set by the user. Claim 14 25 A receiving method comprising: detecting, by a first high frequency processing unit, a first broadcasting wave transmitted using a first frequency band, and extracting a first high frequency signal; detecting, by a second high frequency processing unit, a second 30 broadcasting wave transmitted using a second frequency band different from the first frequency band, and extracting a second high frequency signal; and SP267880WO00 45/46 generating, by at least one local oscillator, a local oscillation signal used in the first high frequency processing unit and the second high frequency processing unit.