Audio Equipment, Servers, Audio Systems, Control Methods and Programs for Audio Equipment
Technical field
[0001]
　One embodiment of the present invention relates to an audio device, a server, an acoustic system, a control method and a program of an audio device that inputs or outputs an audio signal.
Background technology
[0002]
　Patent Document 1 discloses that the emulator 10 debugs the DSP 6 by outputting the signal of the DSP (Digital Signal Processor) 6 to the emulator 10.
Advanced technical literature
Patent documents
[0003]
Patent Document 1: Special Gazette No. 07-11686
Outline of the invention
Problems to be solved by the invention
[0004]
　It is important that audio equipment does not stop sound during use. In other words, it is important for audio equipment to predict whether or not a problem such as stopping the sound will occur. Patent Document 1 does not disclose predicting the occurrence of defects.
[0005]
　One embodiment of the present invention provides an audio equipment, a server, an acoustic system, a control method of the audio equipment, and a program that can confirm information for predicting a defect of the audio equipment from the outside of the audio equipment. The purpose is.
Means to solve problems
[0006]
　The audio equipment includes a network interface, an amplifier that amplifies an audio signal received via the network interface, and a transmission unit that acquires an output value of the amplifier and transmits the output value via the network interface. Be prepared.
The invention's effect
[0007]
　In one embodiment of the present invention, information for predicting a defect of an audio equipment can be confirmed from the outside of the audio equipment.
A brief description of the drawing
[0008]
FIG. 1 is a block diagram showing a configuration of audio equipment 1.
FIG. 2 is a flowchart showing the operation of the audio equipment 1.
FIG. 3 is a block diagram showing a configuration of an audio system 100 including an audio device 1 and a mixer 11 connected to the audio device 1.
FIG. 4 is a block diagram showing a configuration of a mixer 11.
FIG. 5 is a flowchart showing the operation of the mixer 11.
FIG. 6 is a block diagram showing a configuration of a speaker 13.
FIG. 7 is a block diagram showing a more detailed configuration of the amplifier 109.
FIG. 8 is a block diagram showing a detailed configuration of the amplifier 109 according to the first modification.
FIG. 9 is a block diagram showing a detailed configuration of an amplifier 109 according to a second modification.
FIG. 10 is a block diagram showing a detailed configuration of the amplifier 109 according to the third modification.
FIG. 11 is a diagram showing a frequency characteristic of impedance.
FIG. 12 is a diagram showing a frequency characteristic of impedance.
[Fig. 13] Fig. 13 is a block diagram showing a configuration of an acoustic system.
FIG. 14 is a block diagram showing a configuration of a mixer 11.
FIG. 15 is a diagram showing a frequency characteristic of impedance calculated by the signal processing unit 106.
FIG. 16 is a diagram showing a frequency characteristic of impedance calculated by the signal processing unit 204.
FIG. 17 is a diagram showing a display example of the mixer 11 in the display 201.
FIG. 18 is a block diagram showing a configuration of an amplifier 109 that shuts off power when there is no sound.
Mode for carrying out the invention
[0009]
　FIG. 1 is a block diagram showing a configuration of audio equipment 1 according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the audio equipment 1. FIG. 3 is a block diagram showing a configuration of an acoustic system 100 including an audio device 1 and a mixer 11 connected to the audio device 1. FIG. 4 is a block diagram showing the configuration of the mixer 11. FIG. 5 is a flowchart showing the operation of the mixer 11.
[0010]
　The audio equipment 1 includes a network interface (I / F) 103, an amplifier 109, and a transmission unit 150. The network I / F 103 receives an audio signal from an external device (for example, a mixer 11) via the network (S11). The network I / F 103 inputs the received audio signal to the amplifier 109. Although omitted in FIG. 1, the audio equipment 1 includes a D / A converter that converts a digital audio signal into an analog audio signal.
[0011]
　The audio device 1 may include a signal processing unit (DSP: Digital Signal Processor) that processes the audio signal received by the network I / F 103.
[0012]
　The amplifier 109 amplifies and outputs the input analog audio signal (S12). The analog audio signal is input to a speaker (not shown) and output as sound.
[0013]
　The transmission unit 150 acquires the output value of the amplifier 109 (S13). The transmission unit 150 acquires a current value or a voltage value, which is an example of an output value of the amplifier 109, via, for example, a current sensor or a voltage sensor provided in the amplifier 109.
[0014]
　The transmission unit 150 transmits the acquired output value of the amplifier 109 via the network I / F 103 (S14). For example, the transmission unit 150 transmits the output value to the mixer 11 connected via the network.
[0015]
　As shown in FIG. 4, the mixer 11 includes a network I / F 205 and an analysis unit 210. The network I / F 205 receives the output value (S21). That is, the network I / F 205 corresponds to the receiving unit. The analysis unit 210 analyzes the received output value (S22). The mixer 11 predicts whether or not there is a possibility that the audio equipment 1 may have a problem based on the analysis result of the analysis unit 210. For example, if the voltage value shows an abnormally high value or the current value shows an abnormally high value, there is a possibility that the sound equipment 1 may stop sound.
[0016]
　In this way, in one embodiment of the present invention, information for predicting a defect of the audio equipment 1 can be confirmed from the outside of the audio equipment 1 (for example, the mixer 11).
[0017]
　Next, FIG. 6 is a block diagram showing the configuration of the speaker 13. The speaker 13 is one of specific examples of the audio equipment 1.
[0018]
　The speaker 13 includes a display 101, a user interface (I / F) 102, a network interface (I / F) 103, a flash memory 104, a RAM 105, a signal processing unit 106, a CPU 107, a D / A converter 108, an amplifier 109, and a speaker. It includes a unit 111, a power supply unit 131, and an AC supply unit 132.
[0019]
　The display 101, the user I / F 102, the network I / F 103, the flash memory 104, the RAM 105, the signal processing unit 106, the CPU 107, the D / A converter 108, the amplifier 109, and the signal processing unit 106 are connected to the bus 151. There is. The speaker unit 111 is connected to the amplifier 109.
[0020]
　The power supply unit 131 supplies electric power (DC electric power) for driving the amplifier 109. The power supply unit 131 may supply electric power to each configuration of the speaker 13. For example, the power supply unit 131 may supply electric power for driving the CPU 107.
[0021]
　The AC supply unit 132 is a power supply unit that supplies AC power to the power supply unit 131. The AC supply unit 132 is connected to an AC power supply for equipment, a power supply vehicle, or the like. The AC supply unit 132 receives AC power from an AC power source for these facilities, a power supply vehicle, or the like, and supplies the AC power to the power supply unit 131.
[0022]
　The display 101 is composed of, for example, an LCD (Liquid Crystal Display) or an OLED (Organic Light-Emitting Diode), and displays various information. The user I / F 102 includes a switch, a knob, a touch panel, and the like, and accepts the user's operation. When the user I / F 102 is a touch panel, the user I / F 102 constitutes a GUI (Graphical User Interface or less) together with the display 101.
[0023]
　The CPU 107 reads a program stored in the flash memory 104, which is a storage medium, into the RAM 105 to realize a predetermined function. For example, the CPU 107 displays an image for accepting a user's operation on the display 101, and receives a selection operation or the like for the image via the user I / F 102 to realize a GUI.
[0024]
　The program read by the CPU 107 does not need to be stored in the flash memory 104 in the own device. For example, the program may be stored in a storage medium of an external device such as a server. In this case, the CPU 107 may read the program from the server into the RAM 105 and execute the program each time.
[0025]
　The network I / F 103 receives an audio signal from an external device (for example, mixer 11) via the network (same operation as S11 in FIG. 2).
[0026]
　The signal processing unit 106 is composed of a DSP for performing various signal processing. The signal processing unit 106 performs signal processing such as mixing, equalizing, or compression on the audio signal input via the network I / F 103. The signal processing unit 106 outputs the audio signal after signal processing to the D / A converter 108.
[0027]
　The D / A converter 108 converts the input audio signal into an analog audio signal. The amplifier 109 amplifies and outputs the analog audio signal (same operation as S12 in FIG. 2). The analog audio signal is input to the speaker unit 111 and output as sound.
[0028]
　FIG. 7 is a block diagram showing a more detailed configuration of the amplifier 109. The amplifier 109 includes an amplification element 90 and a current-voltage (VI) detection circuit 91. The amplification element 90 is connected to the power supply unit 131. The amplification element 90 amplifies and outputs the analog audio signal output from the D / A converter 108 by receiving the power supply from the power supply unit 131.
[0029]
　The VI detection circuit 91 is connected to the subsequent stage of the amplification element 90 and detects a current value and a voltage value which are examples of output values ​​of the amplification element 90. The signal processing unit 106 acquires the current value and the voltage value from the VI detection circuit 91 (the operation is the same as S13 in FIG. 2). The signal processing unit 106 transmits the acquired output value via the network I / F 103 (same operation as S14 in FIG. 2). That is, in this example, the signal processing unit 106 acquires the output value of the amplifier 109 and transmits the output value via the network I / F 103 to form the transmission unit 150 shown in FIG.
[0030]
　In this example, the transmission unit 150 is configured by a DSP that receives and processes an audio signal via the network I / F 103. Therefore, the audio equipment 1 does not need to be separately provided with new hardware for transmitting the output value of the amplifier 109. Further, the transmission unit 150 may be configured by the operation of software read by the CPU 107. In this case as well, the audio equipment 1 can transmit the output value of the amplifier 109 without the need to separately provide new hardware for transmitting the output value.
[0031]
　FIG. 8 is a block diagram showing a detailed configuration of the amplifier 109 according to the first modification. The amplifier 109 according to the first modification includes a VI detection circuit 901 instead of the VI detection circuit 91. Other configurations are the same as the block diagram shown in FIG. 7.
[0032]
　The VI detection circuit 901 is connected between the power supply unit 131 and the amplifier 109. The VI detection circuit 901 detects the value (current value and voltage value) of the DC power supplied by the power supply unit 131 to the amplifier 109. The signal processing unit 106 acquires the current value and the voltage value of the power supply unit 131 from the VI detection circuit 901. The signal processing unit 106 transmits the acquired current value and voltage value of the power supply unit 131 via the network I / F 103. That is, in this example, the signal processing unit 106 acquires the current value and the voltage value from the power supply unit 131 and transmits them via the network I / F 103.
[0033]
　As a result, the analysis unit 210 can predict whether or not a problem may occur due to the DC power supplied by the power supply unit 131. For example, if a defect occurs in various parts of the power supply unit 131, the voltage value may decrease or the current value may decrease. Therefore, if the voltage value of the power supply unit 131 shows an abnormally low value, or the current value shows an abnormally low value, there is a possibility that the sound equipment 1 may stop sounding.
[0034]
　Therefore, in the modified example 1, the state of the DC power of the power supply unit 131 is confirmed from the outside of the audio equipment 1 (for example, the mixer 11) as information for predicting a defect of the audio equipment 1.
[0035]
　FIG. 9 is a block diagram showing a detailed configuration of the speaker 13 according to the second modification. The speaker 13 according to the second modification includes a VI detection circuit 902.
[0036]
　The VI detection circuit 902 is connected between the AC supply unit 132 and the power supply unit 131. The VI detection circuit 902 detects the value (current value and voltage value) of the AC power supplied by the AC supply unit 132 to the power supply unit 131. The signal processing unit 106 acquires the current value and the voltage value of the AC supply unit 132 from the VI detection circuit 902. The signal processing unit 106 transmits the acquired current value and voltage value of the AC supply unit 132 via the network I / F 103. That is, in this example, the signal processing unit 106 acquires the current value and the voltage value of the AC power output by the AC supply unit 132, and transmits them via the network I / F 103.
[0037]
　As a result, the analysis unit 210 can predict whether or not a problem due to the AC power of the AC supply unit 132 may occur. For example, if the voltage of the power supply on the equipment side drops abnormally, there is a possibility that the sound equipment 1 may stop sound.
[0038]
　Therefore, in the modified example 2, the state of the AC power of the AC supply unit 132 is confirmed from the outside of the audio equipment 1 (for example, the mixer 11) as information for predicting a defect of the audio equipment 1.
[0039]
　The configurations shown in FIGS. 7, 8 and 9 can be realized independently, but the configurations shown in FIGS. 7, 8 and 9 can also be combined.
[0040]
　Next, FIG. 10 is a block diagram showing a detailed configuration of the amplifier 109 according to the third modification. In the amplifier 109 according to the third modification, the signal processing unit 106 includes an analysis unit 110A. Other configurations are the same as the block diagram shown in FIG. 7.
[0041]
　In the example of FIG. 10, the signal processing unit 106 realizes the function of the analysis unit 110A, but the analysis unit 110A may be configured by another hardware. Further, the CPU 107 may realize the function of the analysis unit 110A by software.
[0042]
　The analysis unit 110A analyzes the current value and the voltage value of the amplifier 109 detected by the VI detection circuit 91. The analysis unit 110A calculates the frequency characteristic of impedance, for example, as an example of analysis. The analysis unit 110A converts the impedance time axis signal calculated from the current value and the voltage value into a frequency axis signal by FFT (Fast Fourier Transform). The analysis unit 110A outputs the frequency characteristic of the impedance. The analysis result is output to an external device via the network I / F 103 as shown in FIG. 10, or is displayed on the display 101 by the CPU 107.
[0043]
　FIG. 11 is a diagram showing the frequency characteristics of impedance. The horizontal axis of the graph is frequency (Hz), and the vertical axis is impedance (Ω). In a general amplifier including the amplifier 109, a resonance point is generated in the impedance due to the electrical characteristics of each component, the mechanical characteristics of the components of the speaker unit (for example, the speaker cone and the enclosure), and the like. In the example of FIG. 10, a resonance point exists near 100 Hz.
[0044]
　Then, if a problem occurs in the speaker unit 111, the impedance of the amplifier 109 may change abruptly in a short time. For example, as shown in FIG. 12, when a frequency (singular point) having a specifically high impedance occurs, current does not flow and the amplifier 109 cannot brake the speaker. Further, when a frequency (singular point) having a specifically low impedance occurs, the speaker cone instantly reaches the maximum amplitude, and the speaker cone cannot vibrate. If these states continue, the amplifier 109 or the speaker unit 111 may malfunction and the sound may stop.
[0045]
　Therefore, the audio-visual equipment 1 calculates the frequency characteristic of the impedance and outputs the calculated frequency characteristic to the outside as an analysis result (or displays it on the display 101). As a result, the user can predict in advance whether or not a problem of stopping the sound will occur by observing the frequency characteristic of the impedance. Alternatively, the CPU 107 displays a warning on the display 101 when the above-mentioned singular point occurs, so that the user can determine in advance whether or not a problem that the sound may stop occurs. Can be predicted.
[0046]
　Next, FIG. 13 is a block diagram showing the configuration of the acoustic system 100A. The sound system 100A includes a mixer 11, a plurality of switches (switch 12A, switch 12B), and a plurality of speakers (speakers 13A to 13F).
[0047]
　Each device is connected via a network cable. For example, the mixer 11 is connected to the switch 12A. The switch 12A is connected to the switch 12B and the speaker 13A. The switch 12B is connected to the switch 12A and the speaker 13D. The speaker 13A, the speaker 13B, and the speaker 13C are connected to the switch 12A by a daisy chain. The speaker 13D, the speaker 13E, and the speaker 13F are also connected to the switch 12B by a daisy chain. However, the connection between devices is not limited to the mode shown in FIG. Further, each device does not need to be connected by a network, and may be connected by a communication line such as a USB cable, HDMI (registered trademark), or MIDI, or may be connected by a digital audio cable. ..
[0048]
　The mixer 11 is an example of a server. The mixer 11 inputs an audio signal from another device connected to the network, or outputs an audio signal to the other device. Speakers 13A to 13F are examples of audio equipment, and have the same configuration and function as the speaker 13. The server is not limited to the mixer 11. For example, an information processing device such as a personal computer is also an example of a server. A system (DAW: Digital Audio Workstation) consisting of hardware or software for recording, editing, or mixing audio is also an example of a server.
[0049]
　FIG. 14 is a block diagram showing the configuration of the mixer 11. The mixer 11 includes a display 201, a user I / F 202, an audio I / O (Input / Output) 203, a signal processing unit (DSP) 204, a network I / F 205, a CPU 206, a flash memory 207, and a RAM 208. These configurations are connected via bus 271.
[0050]
　The CPU 206 is a control unit that controls the operation of the mixer 11. The CPU 206 performs various operations by reading a predetermined program stored in the flash memory 207, which is a storage medium, into the RAM 208 and executing the program. For example, the CPU 206 receives the current value and the voltage value of each amplifier from the speakers 13A to the speakers 13F via the network I / F205.
[0051]
　The program read by the CPU 206 does not need to be stored in the flash memory 207 in the own device. For example, the program may be stored in a storage medium of an external device such as a server. In this case, the CPU 206 may read the program from the server into the RAM 208 and execute the program each time.
[0052]
　The signal processing unit 204 is composed of a DSP for performing various signal processing. The signal processing unit 204 performs signal processing such as mixing, equalizing, or compression on the audio signal input via the audio I / O 203 or the network I / F 205. The signal processing unit 204 outputs the audio signal after signal processing to another device such as the speaker 13A via the audio I / O 203 or the network I / F 205.
[0053]
　Further, the signal processing unit 204 inputs the current value and the voltage value of each amplifier from the CPU 206. The signal processing unit 204 constitutes the analysis unit 210. The analysis unit 210 of the signal processing unit 204 analyzes the output values ​​(current value and voltage value of the amplifier 109) of each amplifier from the speakers 13A to 13F. The analysis unit 210 of the signal processing unit 204 also calculates, for example, the frequency characteristic of the impedance. However, the signal processing unit 204 has higher performance than the signal processing unit 106 of the speakers 13A to 13F, and has a high analysis function. Therefore, the signal processing unit 204 can calculate the frequency characteristic of the impedance with a higher resolution than the signal processing unit 106 of the speakers 13A to 13F. As a result, the signal processing unit 204 can obtain a singular point that may lead to a defect with high accuracy.
[0054]
　FIG. 15 is a diagram showing the frequency characteristics of the impedance calculated by the signal processing unit 106, and FIG. 16 is a diagram showing the frequency characteristics of the impedance calculated by the signal processing unit 204.
[0055]
　As shown in FIGS. 15 and 16, the frequency characteristics of the impedance calculated by the signal processing unit 106 and the signal processing unit 204 are discrete values ​​because they are digital signals. The number of discrete values, that is, the resolution, depends on the number of taps of the digital filter realized by the DSP and depends on the resources of the DSP. The signal processing unit 204 of the mixer 11 is realized from a large number of high-performance DSPs in order to process audio signals of a large number of channels. On the other hand, since the signal processing unit 106 provided in the speaker 13 processes the audio signal for one or several channels transmitted from the mixer 11, the performance is relatively higher than the DSP of the signal processing unit 204 of the mixer 11. A low DSP is used. Therefore, as shown in FIGS. 15 and 16, the impedance frequency characteristic calculated by the signal processing unit 106 has a lower resolution than the impedance frequency characteristic calculated by the signal processing unit 204 of the mixer 11. Therefore, there is a possibility that the resonance frequency having a steep peak characteristic (high Q value) cannot be extracted from the impedance frequency characteristic calculated by the signal processing unit 106. On the other hand, as shown in FIG. 16, since the frequency characteristic of the impedance calculated by the signal processing unit 204 has high resolution, the resonance frequency having a steep peak characteristic can be accurately extracted.
[0056]
　In this way, the mixer 11 receives the output value of the amplifier from each speaker, and can perform a highly accurate analysis that cannot be calculated by each speaker. In particular, when the impedance changes rapidly in a short time, there is a possibility that steep characteristics that cannot be extracted by each speaker alone may occur. However, since the mixer 11 performs high-precision analysis, the user can predict in advance the possibility of failure.
[0057]
　Further, in the mixer 11, the user can list the analysis results of a plurality of speakers. For example, as shown in FIG. 17, the mixer 11 displays the frequency characteristics of the impedances of the plurality of speakers 13A, the speakers 13B, the speakers 13C, and the speakers 13D on the display 201 of the mixer 11.
[0058]
　In this case, the user can easily identify the speaker that may cause a problem among the plurality of installed speakers. Therefore, even if the number of speakers installed is large, the user can easily reset which audio signal is transmitted to which speaker and what kind of signal processing is to be performed. For example, the user changes the setting of the mixer 11 when it is determined that there is a high possibility that a problem will occur in a certain speaker (first speaker). For example, the user can output the audio signal of the bus from the second speaker by replacing the bus set in the first speaker with another speaker (second speaker).
[0059]
　In addition, the user can determine by looking at the display of the display 201 whether there is a high possibility that a problem will occur only in a specific speaker or a problem will occur in conjunction with a plurality of speakers. .. For example, as shown in FIG. 17, when similar singularities occur in a plurality of speakers 13A, speakers 13B, speakers 13C, and speakers 13D, the user of the mixer 11 has an individual problem in each speaker. It turns out that it is a problem that occurs in conjunction with multiple devices. Therefore, there are a plurality of problems such as a problem caused by the power supply on the equipment side, a problem of the space where the speakers are installed, a problem of the equipment equipped with a plurality of speakers (for example, a rack for installing in an array), and the like. It is possible to narrow down the causes common to all devices.
[0060]
　Further, as described above, when the user of the mixer 11 determines that there is a high possibility that a problem occurs in a specific speaker, the user sets the audio signal to be transmitted to the specific speaker to another speaker. Then, you can take appropriate measures. Further, the CPU 206 of the mixer 11 operates to transmit an audio signal to be transmitted to the speaker to another speaker when an impedance characteristic (a peak having a high Q value) showing a steeply high value exists in a predetermined frequency band. May be done. In this case, the CPU 206 functions as a control unit that controls the parameters of the audio equipment based on the analysis result of the analysis unit.
[0061]
　In this embodiment, an example of calculating the frequency characteristic of impedance is shown, but the analysis is not limited to the calculation of the frequency characteristic of impedance. For example, the average current value and the average voltage value may be obtained, or the instantaneous value and the average value may be compared. Since the output value of the amplifier 109 is an AC signal, any method can be applied to the method used for the analysis of the AC signal.
[0062]
　Moreover, since the output value (voltage value and current value) of the amplifier is the analog audio signal itself, it can be analyzed as sound. By listening to the output values ​​(voltage value and current value) of the amplifier as sound, the user can determine that there is a high possibility that a problem will occur, for example, when the noise sound is loud.
[0063]
　It should be noted that the description of this embodiment is an example in all respects and is not restrictive. The scope of the present invention is indicated by the scope of claims, not by the above-described embodiment. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the claims.
[0064]
　For example, FIG. 18 is a block diagram showing a configuration of an amplifier 109 that shuts off the power supply when there is no sound in order to reduce power consumption. In FIG. 18, the amplifier 109 includes an amplification element 90, a VI detection circuit 91, an input detection circuit 95, and a switch 50.
[0065]
　The input detection circuit 95 is connected to the front stage of the amplification element 90 and detects the level of the audio signal input to the amplification element 90. The CPU 107 determines whether or not an audio signal is input based on the detection result of the input detection circuit 95. For example, the CPU 107 determines that the audio signal is input when the level of the audio signal detected by the input detection circuit 95 is equal to or higher than a predetermined value. When the level of the audio signal is less than a predetermined value, the CPU 107 determines that the audio signal has not been input. When the CPU 107 determines that no audio signal has been input, the CPU 107 turns off the switch 50 to shut off the power supply of the amplification element 90. As a result, the CPU 107 reduces unnecessary power consumption.
[0066]
　On the other hand, even when the switch 50 is turned off, the CPU 107 turns on the switch 50 when the voltage value detected by the VI detection circuit 91 exceeds a predetermined threshold value. When the power supply of the amplification element 90 is cut off, the cone of the speaker unit vibrates freely. Therefore, the cone of the speaker unit may vibrate due to the influence of sound emitted from other speakers. When the cone of the speaker unit vibrates, the counter electromotive force may damage the amplification element 90. In particular, in the case of a PA (Public Address) system in a large-scale space, a large number of a plurality of speakers are installed adjacent to each other. Also, the volume of each speaker becomes very loud. Therefore, the vibrations between the plurality of speakers have a great influence on each other.
[0067]
　Therefore, even if the power supply of the amplification element 90 is cut off, the CPU 107 turns on the switch 50 to turn on the power supply when the voltage value detected by the VI detection circuit 91 exceeds a predetermined threshold value. When power is supplied to the amplification element 90, the operation of the cone of the speaker unit is controlled by the power of the power supply (power of the output signal). As a result, the amplifier 109 prevents the amplification element 90 from being damaged by the counter electromotive force generated by the vibration of the cone of the speaker unit.
[0068]
　Then, as shown in FIG. 13, when the output value of each speaker is transmitted to the mixer 11, the mixer 11 can monitor the back electromotive force of each speaker. In this case, the mixer 11 transmits an instruction to turn on the power to the speaker whose back electromotive force exceeds a predetermined value. By outputting the output value of the amplifier to the outside in this way, the user can monitor the state of each speaker from the server. Audio-visual equipment can prevent problems from occurring while reducing power consumption.
Description of the sign
[0069]
11 ... Mixers
12A, 12B ... Switches
13, 13A, 13B, 13C, 13D, 13E, 13F ... Speaker
50 ... Switch
90 ... Amplifying element
91 ... VI detection circuit
95 ... Input detection circuit
100 ... Sound system
101 ... Display
102 ... User I / F
103 ... Network I / F
104 ... Flash memory
105 ... RAM
106 ... Signal processing unit
107 ... CPU
108 ... D / A converter
109 ... Amplifier
110A ... Analysis unit
111 ... Speaker unit
131 ... Power supply unit
132 ... AC Supply unit
150 ... Transmission unit
151 ... Bus
201 ... Display
202 ... User I / F
203 ... Audio I / F
204 ... Signal processing unit
205 ... Network I / F
206 ... CPU
207 ... Flash memory
208 ... RAM
210 ... Analysis unit
271 ... Bus
901, 902 ... VI detection circuit
The scope of the claims
[Request item 1]
　An 　acoustic 　system including a network interface,
　an amplifier that amplifies an audio signal received via the network interface, and a transmitter that
acquires an output value of the amplifier and transmits the output value via the network interface.
machine.
[Request item 2]
　A signal processing unit that performs signal processing on an audio signal received via the network interface is provided, and the
　signal processing unit acquires the output value and transmits the output value via the network interface.
　The audio equipment according to claim 1 , which constitutes the transmission unit .
[Request item 3]
　A power supply unit for supplying power to the amplifier,
　and the transmission unit, the power supply unit obtains a current value or voltage value supplied to transmit via the network interface,
　according to claim 1 or claim 2 Audio equipment.
[Request item 4]
　Includes a power supply unit for supplying AC power to the power supply unit,
　and the transmission unit, the power supply unit acquires the current value or the voltage value of the AC power is transmitted via the network interface,
　wherein Item 3. The acoustic device according to item 3.
[Request 5]

　The audio-visual equipment according to any one of claims 1 to 4 　, further comprising an analysis unit for analyzing the output value .
[Request 6]
　A 　server including a
　network interface, a receiving unit that receives an output value of an amplifier of an audio device from the audio device via the network interface, and
　an analysis unit that analyzes the output value received by the receiving unit
.
[Request 7]

　The server according to claim 6 　, further comprising a control unit that controls parameters of the audio equipment based on the analysis result of the analysis unit .
[Request 8]

　The server according to claim 6 or 7, 　wherein the analysis unit calculates the frequency characteristic of impedance .
[Request item 9]
　Equipped with audio devices and a server,
　wherein the acoustic device,
　a first network interface,
　and an amplifier for amplifying the audio signal received via the first network interface,
　the acquired output values of the amplifier, the output value a transmission unit for transmitting via the first network interface,
　including a
　said server,
　a second network interface,
　via the second network interface, receives the output value of the amplifier of audio equipment from the audio apparatus, An 　audio system including a receiving unit and
　an analysis unit that analyzes the output value received by the receiving unit
.
[Request item 10]
　A method for controlling an audio device, in which an audio signal received via a network interface is amplified by an
　amplifier, an output value of the amplifier is acquired, and the
　output value is transmitted via the network interface
　.
[Request 11]
　The audio device according to
　claim 10 , wherein a signal processing unit that performs signal processing on an audio signal received via the network interface acquires the output value and transmits the output value via the network interface. Control method.
[Request 12]
　The 　method for controlling an audio device according to claim 10 or 11 ,
　wherein a current value or a voltage value supplied by a power supply unit that supplies electric power to the amplifier is acquired and transmitted via the network interface
.
[Request 13]
　The 　method for controlling an audio device according to claim 12 ,
　wherein the current value or voltage value of the power supply unit that supplies AC power to the power supply unit is acquired and transmitted via the network interface
.
[Request 14]
　The
　method for controlling an audio device according to any one of claims 10 to 13 , wherein the output value is analyzed .
[Request 15]
　A program that causes an audio device to execute 　a process of amplifying an audio signal received via a network interface by an amplifier, a process
　of acquiring an output value of the amplifier,
　and a process of transmitting the output value via the network interface.