JP2003274499A - Audio information transmission apparatus and audio information reception apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio information transmission apparatus for wirelessly transmitting audio and control data to a receiver (loudspeaker) with an excellent frequency efficiency. <P>SOLUTION: The transmission apparatus comprises: a multi-channel modulator 11 for modulating many analog input signals by selecting two analog input signals for one channel; a digital data generating unit 16 for generating digital data to control the receiver for receiving the modulated input signals; a multiplexer 12 for multiplexing the modulation signal of the digital data with the modulation signal of the analog input signal; a frequency converter 13 for applying frequency conversion to the multiplexed signal; and a changeover device 25 for assigning the modulation signal of the digital data to any of the modulation signals of a plurality of channels. The transmission apparatus applies frequency conversion to the multiplexed signals of a plurality of the channels, assigns them to a plurality of different transmission frequencies, selects at least one of the modulation signal of the digital data from the modulation signals of a plurality of the channels and transmits the multiplexed signal. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention An analog wave of multiple sound sources and its control digital data are transmitted using a wireless communication means for multiplexing analog signals and digital signals such as FM multiplex broadcasting, and both analogs are sent by a multi-channel speaker. The present invention relates to a voice information transmitting / receiving device that receives a wave and control digital data to generate a sound.

[0002]

2. Description of the Related Art Conventionally, FM multiplex broadcasting (ARIB ST
Mixed analog and digital broadcasting conforming to the D-B3) standard is performed. In addition, by owning a sound source and transmitting weak radio waves in accordance with this format, it is possible to locally deliver audio. According to Japanese Utility Model Laid-Open No. Sho 63-68235 and Japanese Utility Model Laid-Open No. 4-96142, analog voice is distributed by FM in a vehicle, a room or the like locally in accordance with the above format.

Further, in the above transmission standard, digital data can be multiplexed at the same frequency, and in ordinary broadcasting, the text is mainly broadcast, and the user often sees the text directly to obtain information. However, these multiplexed data are not limited to texts and may be machine-readable instruction codes, such as Japanese Patent Laid-Open Nos. 9-214446 and 11-168437.
Japanese Patent Laid-Open Publication No. 2003-242242 discloses an example in which a program code that operates in a receiver is multiplexed on the transmitting side and the program code is executed by the receiver.

Therefore, if a weak radio wave is transmitted in accordance with the above-mentioned transmission standard, a machine-readable command can be locally delivered. By the way, with the advent of DVD and BS digital broadcasting tuners in recent years, multi-channel reproduction by a large number of speakers at home has become possible. In this multi-channel reproduction system, a large number of speakers are arranged around a reproduction amplifier in the home, and the amplifier and each speaker are connected by a wired speaker cable as in the conventional case.

In the schematic diagram of multi-channel reproduction by the conventional 6 speakers shown in FIG. 14, there are sound sources (DVD players, digital BS tuners, etc.) that output 6 kinds of analog waves, and an amplifier for amplifying each channel is provided. Is entered. There are six speakers (speakers 70-
Speakers 75) are arranged, and a signal amplified for each channel is transmitted from the amplifier 77 to each speaker by a wired speaker cable.

As described above, in the case of multi-channel reproduction, since the number of speakers is large, the wiring work is complicated, and the movement of the speakers is limited because it is a cable. Further, as shown in FIG. 14, a large number of cables are arranged around the amplifier in a radial pattern, which causes a problem that the usable area of the room is restricted.

[0007]

As described above, when performing multi-channel reproduction by a large number of speakers, connecting by wire increases the number of speakers compared to the conventional two, so that the wiring work of the speaker cable increases and the speaker increases. Is also restricted, and the large number of speaker cables makes the room unusable. There is also a problem that wiring is difficult when the speaker is installed overhead (ceiling).

Therefore, the present invention is a transmission / reception device which has been made to solve such a problem, and wirelessly transmits an audio signal from an amplifier (transmission device) to a speaker (reception device) via a transmission / reception antenna, and the audio is transmitted by the radio. An analog FM radio wave is used as a transmission means for transmitting a signal. When the FM transmission means is used for the multi-multi-channel music transmission as described above, since the FM radio wave broadcasting standard uses 2 channel analog and 1 channel data per frequency, 6
In the case of a speaker or the like, 3 frequencies are required.

Further, in such a transmission method, control such as volume adjustment of each speaker needs to be additionally performed by a communication means different from the voice signal. In the present invention, the FM of the above-mentioned FM radio wave
By using the multiplex communication method, control commands to the speaker such as volume are transmitted and received as character multiplex data for each frequency. Further, since the audio information transmitting apparatus of the present invention uses the same frequency band as the actual broadcasting frequency, a frequency which avoids the transmission frequency of the actual broadcasting which is broadcast in the usage area of the audio information transmitting apparatus of the present invention is selected. There is a need.

[0010]

In order to solve the above-mentioned problems, the invention as set forth in claim 1 is directed to a plurality of speakers arranged to reproduce stereophonic sound by a plurality of audio channels. In a voice information transmitting device that wirelessly transmits each voice channel input signal corresponding to a number of voice channels to a voice information receiving device connected to each speaker, setting of a receiving frequency received by the voice information receiving device, Control data modulators 19 and 24 for generating control data relating to input switching setting to the speaker and volume value setting of the speaker and modulating the control data, and each audio channel input signal as one set of two input signals. Audio input modulators 11A to 11C for modulating by the FM multiplex communication system, output of the control data modulator and each sound A voice information transmitting apparatus, comprising: multiplexers 12A to 12C for multiplexing an output of an input modulator and frequency converters 13A to 13C for frequency-converting the multiplexed signal. The invention described in Item 2 is an audio information receiving device connected to a speaker that receives a transmission signal from the audio information transmitting device according to Claim 1, and a reception signal selection device 41 that selects the reception signal. ~ 43, 51 and audio demodulation devices 44, 52 for demodulating an audio signal from the selected received signal
A control data demodulation device 45, 46 for demodulating the selected control data, and decoding the control data to set the reception frequency control data to the reception signal selection device.
The input switching setting control data is the input switching device 5
3, the volume value setting control data is the speaker amplifying device 5
4 is provided with a control data decoding device 47 respectively supplied to the voice information receiving device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the voice information transmitting / receiving apparatus of the present invention will be described below with reference to the drawings. In the schematic diagram of multi-channel reproduction by 6 speakers of the audio information receiving apparatus of the present invention shown in FIG. 12, there are sound sources (DVD players, digital BS tuners, etc.) 6 that output 6 kinds of analog waves, and each channel has It is input to the transmitting device (amplifier) 7 for amplification. There are 6 speakers centered around the user (speaker 0 to speaker 5)
According to the present invention, the audio signal for each channel is wirelessly transmitted from the transmitting device (amplifier) 7 to the receiving devices 80 to 85 of the respective speakers.

As described above, in the case of multi-channel reproduction, wiring between amplifiers becomes a problem due to the large number of speakers, but since wiring work is unnecessary and no cables are required, the speakers can be moved freely without any restrictions. It is something you can do. Therefore, in the present invention, the audio signal radio is used for transmission, and the FM multiplex communication (broadcast) system is applied to this transmission method.

FIG. 13 shows the frequency allocation of the physical layer standard of the above standard. The sum and difference signals of the L and R2 channel analog signals are arranged, and the pilot signal (frequency F
p) is in between, which separates both channels. On top of that, L-MSK (Level contro
(lled MSK) modulated data is multiplexed so that the entire baseband frequency is within Fbb. Broadcasting is converted into frequencies of each allocation and broadcast while maintaining this frequency arrangement.

Therefore, according to the transmission method based on the FM multiplex communication (broadcasting) system with the frequency allocation shown in FIG. 13, two channels of analog audio waves (signals) (L, R) and 1 per frequency are used.
Channel data (DATA) is transmitted. 12
In the case of the 6-speaker as shown in (3), all 6 channels of analog waves (signals) are transmitted using 3 kinds of frequencies, and the 6-speaker receiving device is controlled by the 3-channel data.

FIG. 1 shows each speaker (speaker ID) of FIG.
= 0 to 5), three frequencies Fc, F1, and F2 are used, and analog audio signals (L,
FIG. 6 is a diagram showing each assignment of R) and multiplexed data DATA. The frequency Fc is a default frequency for the transmitter and the speaker (receiver) to communicate with each other, and the transmitter transmits a command for allocating the frequency or channel as shown in FIG. The analog wave (signal) of the frequency Fc is also used as the signal of the previous two speakers (speaker ID = 0, 1).

The frequencies F1 and F2 are the remaining speakers (speaker ID = 2, 3) and speakers (speaker ID = 4).
The frequency for 5) is changed to each frequency by the command at the frequency Fc. The above frequencies Fc, F1, and F2 are shown in FIG.
It is selectively set by the microprocessor (μP) so that it does not match the frequency Fb of the actual broadcast shown in FIG.

FIG. 2 is a diagram showing the speaker allocation of FIG. 1. The allocation shown in this figure is stored in the transmission device in advance, and a command to make this allocation is issued. In addition, there are few speakers, and the front two (speaker ID =
In the case of only 0, 1), the frequency may be only Fc, and if the user inputs the speaker configuration in advance, the transmitting device can perform flexible frequency and channel allocation according to the speaker configuration.

FIG. 3 is a block diagram showing the first embodiment of the music information transmitting apparatus of the present invention. Analog audio channel input as signal source (analog inputs 1-6)
There are six of them, and each signal is multiplexed by two channels by the multiplexers 11A, 11B, and 11C and FM-modulated.

On the other hand, there is a recording device in which the frequency Fc is predetermined and recorded for the initial communication between the transmitting device and the speaker as described above. Further, there is a storage device having a regional information database (DB) which reads out the frequencies F1 and F2 which avoid the broadcast frequency of the region when the user inputs the regional information (three-digit number or the like) of the transmitting device. The microprocessor (μP) 16 reads the frequency Fc and the area information of the user at the initial stage, and determines the frequencies F1 and F2 in the database (DB).

Further, the microprocessor (μP) 16 sends a command to the speaker to set the frequency, channel, etc. to the data generator 19, and the character multiplex data conforms to the above-mentioned broadcasting format. This signal is L
-MSK (Level controlled MS)
K) The signal is modulated by the modulator 24 and is supplied to the multiplexers 12A, 12B and 12C via the switching device 25 that performs switching according to the instruction of the microprocessor 16, and the FM modulated wave and the multiplexer of each group are combined. 12A, 12B, 12C
To multiplex.

In this case, the control frequency is 3 as described above.
Since there are sets, signals are sent to a predetermined multiplexer and multiplexed at the initial stage. When the initial setting is completed for the speaker, the switching device 2 transmits data corresponding to each frequency.
At 5, the signals are switched to the multiplexers 12A, 12B, 12C for each set.

Each FM signal is frequency-converted by the frequency converters 13A, 13B and 13C into transmission frequencies of frequencies Fc, F1 and F2, the three frequencies are further multiplexed by the analog multiplexer 26, and the power is fed by the power amplifier 27. Amplified,
It is transmitted from the transmitting antenna 28 to the receiving side.

FIG. 4 is a block diagram showing the first embodiment of the voice information receiving apparatus and the speaker apparatus of the present invention. In order to enable the multi-channel speaker device to reproduce multi-channel stereophonic sound as shown in FIG. 12, for example, in the present embodiment, the front speaker (FR) is used.
1, speaker (W) 5, speaker (C) 4, speaker (FL) 0, rear speaker (RR) 2, speaker (R)
It is assumed that a total of 6 speakers of L) 3 are arranged.

The FM radio wave from the receiving antenna 41 is amplified by the amplifier 42, converted into an intermediate frequency by the mixer 43, and FM demodulated by the FM demodulator 44. The demodulated analog signal is L by the demultiplexer (DEMUX) 52,
It is separated into R channels, and either channel is switched by the input switching device 53. The selected channel signal is amplified by the amplifier 54 and reproduced by the speaker 55. Here, it is assumed that the input switching device 53, the speaker amplification device 54, and the speaker 55 constitute a speaker device 60.

On the other hand, the data signal after FM demodulation is L-MS.
A K (Level controlled MSK) demodulation device 45 performs L-MSK demodulation, and a decoding device 46 decodes it to generate a command as a microprocessor (μP).
Is supplied to 47.

The microprocessor 47 reads the digital control data of this command, and if it is a control data command for setting the reception frequency, supplies it to the local oscillator 51 to set the frequency change. In addition, the control data of the input channel (CH) switching setting is supplied to the input switching device 53, and the control data of the volume value setting is supplied to the speaker amplifying device 54. In addition, various sound quality setting functions such as bass and treble can be similarly set by sending setting signals to each function part. At the initial stage, the microprocessor (μP) 47 reads each data from the storage device of the common frequency Fc and the speaker ID which are recorded in advance, and uses them as the basis for interpreting the command.

FIG. 5 is a schematic diagram of the format of the character multiplex data. One setting event such as volume setting is made up of one or more commands, and this command is transmitted using one program. One program consists of a program management header and one or more pages. Describe the command on each page and transmit.

When each page is received by the receiver of level 1 format 0, it is displayed with one line of the header sentence and two lines of the text, and in the figure, the command is described in the text. If it does not fit in two lines, write it over multiple pages. Basically, it conforms to the normal actual broadcast format, and commands are written instead of the main text to be broadcast.

If a program number is inserted in the program data header and a value that does not exist in normal broadcasting is entered, the broadcast will be performed if the reception side sees a match of the program numbers even when the broadcast waves are interfering. Waves can be eliminated.

FIG. 6 is a flowchart showing the operation procedure of the microprocessor 16 of the transmitting apparatus shown in FIG.
FIG. 6A shows the initial settings when the power is turned on (step S
1) Obtain the area code of the transmitting device from the user (step S2), and use frequencies Fc and F that do not overlap with the broadcast frequency.
1, F2 are read from the database (DB) (step S3).

Next, parameters such as a program number, a speaker ID, a designated frequency and a channel which do not overlap with the broadcast are set (steps S4 to S7) and transmitted to the data generator (step S8).

This signal is transmitted to all speakers at frequency Fc (step S9), and analog signals are transmitted from each channel (step S10) for reproduction from the speakers.

FIG. 6B shows the operation of the event to be processed when there is a remote control input (volume increase / decrease) from the user after the initial setting (steps S12 to S14). When the speaker ID instruction (or all) is received from the user (step S15), a setting command such as volume is set to the corresponding speaker ID (or all speakers) at a predetermined frequency assigned to each speaker. A command is transmitted (step S17).

FIG. 7 is a flowchart showing the operation procedure of the microprocessor 47 of the voice information receiving apparatus of FIG. With the initial settings when the power is turned on (step S21),
The storage device in which the frequency Fc and the speaker ID are recorded in advance is read (step S22), the reception frequency is set to the frequency Fc (step S23), and the command is received (S24).

The speaker ID in the command is the own speaker I.
If it matches D (step S25), the command is executed (step S28). For example, in the case of a volume setting command, an operation of decoding the numerical value of the volume setting and outputting the set value from the port to change the amplification degree is performed. An analog signal is received (step S29).

FIG. 8 is a schematic representation of the frequency transmitted from the transmitter (transmitter) to each speaker and the transmission content of the command. First, the frequency is set to Fc as the initial setting (the entire speaker is initially received by Fc), and the speaker ID =
A command for setting 0 (front left FL) and channel = L is transmitted. Next, speaker ID = 1 (front right F
R) to set the channel = R respectively.

The setting of speaker ID = 2 and 3 is the frequency Fc and speaker ID = 2 (rear right RR) is channel =
When R is set, a command for setting speaker ID = 3 (rear left RL) is set to channel = L, and when parameters other than frequency are transmitted, the reception frequency is finally set to frequency F.
A command to change to 1 is transmitted to change the reception frequency.

All of the following speakers 55 (speaker ID 0
Up to 5) parameters such as frequency and channel are set, and the initial setting ends. After that, by transmitting an analog voice for each frequency and channel, the voice is reproduced from each speaker 55 (speaker IDs 0 to 5).

Next, when the user's remote controller 29 gives an instruction to change the volume setting, all the speaker IDs are changed to
Volume setting commands are sequentially transmitted at frequencies of Fc, F1, and F2. If the speaker IDs are set at the same time, two speakers receiving at that reception frequency can simultaneously receive the command and execute the command.
If D is set to a specific value, it is possible to control only a specific speaker.

In the control method of the above-described embodiment, the frequencies for transmitting the control data are changed to the frequencies Fc, F1 and F2, respectively, according to the reception frequency of the speaker.
The data frequency for control is fixed to Fc, and only the analog signal can be transmitted at the above frequency.

FIG. 9 shows a second embodiment of the transmitter of the voice information transmitter according to the present invention, in which the blocks of the transmitter of FIG. 3 are modified as in this embodiment. Data multiplexing is 1
Since only one frequency is needed, the multiplexer 12 needs only one frequency.

FIG. 10 shows a second audio information receiving apparatus according to the present invention.
In this embodiment, the block of the receiving device in FIG. 4 is modified as in this embodiment. Since analog reception and data reception are performed at different frequencies at the same time, from the antenna 61 to frequency conversion and FM demodulation, mixing devices 63A and 63B,
Two FM demodulators 64A and 64B are required, and the microprocessor 67 needs to be controlled to set both frequencies.

As shown in FIG. 5, the transmission format of the above embodiment can be displayed by a general receiving apparatus by the upper hierarchy and the human-readable character code is stored in the character / graphic unit. As another example, consider the case of a dedicated transceiver arrangement. Then, the format need not be a character code that can be read by a general existing receiving device, and in this embodiment, a command group is directly described in a data packet of a lower hierarchy.

FIG. 11 (1) shows the situation. In the layer 2 of the above standard, one frame consists of 272 blocks, and each block consists of a block identification, a data packet, a CRC and a row parity. A block in which a packet of column parity is inserted is appropriately inserted in the frame to perform column correction in the frame.

The control command group is inserted into the data packet, but when it is not included in one packet as shown in FIG. 11A, it is inserted into a plurality of data packets. Other data packets have an empty code to be used as an identification code indicating that the packet is not a command.

In this way, the transmission format in the low hierarchy can reduce the hardware and software loads on both the transmitting side and the receiving side, and the throughput from transmitting to receiving can be improved accordingly.

FIG. 11B schematically shows the temporal storage procedure of these command groups. First, a command group to be transmitted is generated and stored in each packet. If it is known to be stored in a plurality of packets at the time of transmission, it is stored in a plurality of packets and a block identification code is added as shown in the figure, and a CRC or a row parity is added to complete a block.

The empty block is filled with empty code. Since the minimum physical transmission unit is a frame, when a plurality of command groups to be transmitted are stored at once, a frame transmission command is sent to start transmitting a frame.

If no event occurs thereafter, the frame is transmitted and the transmission of one command group is completed. After this, when an event occurs and a new command group is transmitted, the command group is stored in the frame head block again and transmitted in frame units. By repeating the above, it is possible to transmit a command group in frame units.

Here, for example, when the volume key of the remote controller is pressed by the user during frame transmission to transmit a volume command, a volume command (ALLVOL0) is generated by an event and is not transmitted as shown in FIG. 11 (2). Insert in the block. Since the data packet filled with the vacant code is rewritten, the column block for column correction thereafter is also changed at the same time. If an event occurs again during the subsequent frame transmission, the same processing as described above is performed, and it becomes possible to dynamically insert a command group by a plurality of events within one frame, and real-time control processing becomes possible.

The block inserted by the event is transmitted, and if the event does not occur thereafter, the transmission of the frame ends as described above, and the transmission of the plurality of command groups ends. As described above, it may be difficult in hardware implementation to simultaneously change the subsequent column blocks for column correction in accordance with the rewriting of the data packet.

In this case, it is assumed that only the row correction is performed on the receiving side and the column correction is not performed, and the column block for the column correction is prepared with an appropriate fixed value that does not cause an error in the row correction. It should be inserted in the frame without depending on rewriting.

Even if the data is transmitted in such a format, on the receiving side, if there is no error in the row correction, the command group in the packet can be read out and real-time control can be performed as described above. However, since column correction cannot be performed, the reliability of the data in units of frames is reduced.

The receiving device does not always wait for the end of the frame,
The received blocks are sequentially decoded and the decoded commands are executed on the spot. As described above, command insertion is performed in block units, and transmission is performed in frame units. By storing multiple commands in one frame that has a relatively long transmission time, real-time control with a short response time becomes possible. .

Also, when an event occurs during frame transmission and a command is further transmitted, the command group can be transmitted without waiting for the end of the frame by inserting the command group in the frame in the middle of transmission, and the response time is short. Real-time control becomes possible.

In this embodiment, since the ID numbers are assigned to the speakers, it is possible to flexibly control from at least one speaker to all at once.

Further, since the control command has the same format as that of the ordinary teletext, it is easy to reuse the software of the existing transmission / reception device with the transmission / reception device. If a program number is added when a command is sent, it can be eliminated even if radio waves of the actual broadcast that are not that value are interfering.

Further, since the area information is input and the frequency avoiding the broadcasting frequency of the area is selected, the problem of interference with broadcasting can be avoided.

According to the transmission format of the second embodiment, since the hierarchy is low, the hardware of both transmitting and receiving sides,
The software load can be reduced, and the throughput from transmission to reception can be improved accordingly.

Storing a plurality of commands in one frame, which has a relatively long transmission time, improves the transmission efficiency and enables real-time control with a short response time. Also, by inserting a command group into a frame being transmitted even during frame transmission, the command group can be transmitted within the frame without waiting for the end of the frame, and real-time control with a short response time becomes possible.

If the column correction is not performed on the receiving side and the block for column correction is inserted without depending on the inserted command group, the column correction cannot be performed, but the timing problem of the transmission hardware is avoided. It is possible to reduce the circuit amount and cost.

[0062]

As described above, according to the present invention,
Since the audio signals of each channel can be transmitted to a large number of speaker devices cordlessly (wirelessly), the number of steps for wiring a plurality of speaker cables can be reduced. Moreover, the problem that a large number of speaker cables occupy the area of the room is released.

Further, according to the present invention, in addition to analog voice, it is possible to wirelessly set the control such as the volume of each speaker device by the multiplexed control data of the same frequency on the transmitting device side. Therefore, it is not necessary to specially prepare a frequency dedicated for control, and the use efficiency of radio waves can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a multi-channel speaker and frequency allocation of a voice information transmitting / receiving apparatus of the present invention.

FIG. 2 is a diagram showing multi-channel speakers and frequency allocation of the audio information transmitting / receiving apparatus of the present invention.

FIG. 3 is a diagram showing a block configuration of a first embodiment of an audio information transmitting apparatus of the present invention.

FIG. 4 is a diagram showing a block configuration of a first embodiment of a voice information receiving device and a speaker device of the present invention.

FIG. 5 is a format diagram of a character command of the present invention.

FIG. 6 shows a flowchart of the operation of an embodiment of the voice information transmitting apparatus of the present invention.

FIG. 7 shows a flowchart of the operation of one embodiment of the audio information receiving apparatus of the present invention.

FIG. 8 is a diagram showing an example of a communication procedure of the voice information transmitting apparatus and the voice information receiving apparatus of the present invention.

FIG. 9 is a diagram showing a block configuration of a second embodiment of the voice information transmitting device of the invention.

FIG. 10 is a diagram showing a block configuration of a second embodiment of an audio information receiving device of the present invention.

FIG. 11 is a diagram showing a second embodiment of the transmission format of the present invention.

FIG. 12 is a diagram schematically showing a configuration of an embodiment of an arrangement of speakers for reproducing multi-channel speakers according to the present invention.

FIG. 13 is a diagram schematically showing a frequency arrangement of an FM character multiplex communication (broadcast) system.

FIG. 14 is a diagram schematically showing an example of the configuration of the arrangement of each speaker for conventional multi-channel speaker reproduction.

[Explanation of symbols]

0 speaker device (FL) 1 speaker device (FR) 2 speaker device (RR) 3 speaker device (RL) 4 speaker device (C) 5 speaker device (W) 6 sound source 7 multi-channel (CH) amplifier ( Voice information transmitting device) 11A, 11B, 11C Multiplexer (voice input modulator) 12A, 12B, 12C Multiplexing device 13A, 13B, 13C Frequency converter 14, 49, 69 Common frequency 15 Regional frequency 16, 47 Microprocessor ( Control data decoding device,
μP) 17 Display device 18 Input device 19 Data generator (control data generator) 24 L-MSK modulator (control data modulator) 25 Switching device (allocator) 26 Analog multiplexer 27 Power amplifier 28 Transmission antenna 29 Remote controller 41 , 61 receiving antennas 42, 54, 74 amplifiers 43, 63A, 63B mixers 44, 64A, 64B FM demodulators (voice demodulators) 45 L-MSK demodulators (control data demodulators) 46 decoders (control data demodulators) 48, 68 Speaker ID 51, 71A, 71B Local oscillator 52, 72 Demultiplexer (DEMUX, audio demodulation device) 53, 73 Input switching device 54 Speaker amplification device 55, 75 Speaker 60 Speaker device 80-85 Audio information receiving device F1, F2, Fc Transmission frequency F Broadcasting transmission frequency of actual broadcast

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Claims (2)

[Claims] 1. A plurality of speakers arranged so as to reproduce stereophonic sound by a plurality of audio channels, and audio channel input signals corresponding to the plurality of audio channels are wirelessly connected to the respective speakers. In a voice information transmitting device for transmitting to each voice information receiving device, control data relating to setting of a reception frequency received by the voice information receiving device, input switching setting to the speaker, volume value setting of the speaker, and control thereof are generated. A control data modulator for modulating data; a voice input modulator for modulating each voice channel input signal into two sets of two input signals by an FM multiplex communication system; an output of the control data modulator and each voice input; A multiplexer for multiplexing the output of the modulator, and a frequency converter for frequency-converting the multiplexed signal An audio information transmitting apparatus comprising: 2. A voice information receiving device connected to a speaker for receiving a transmission signal from the voice information transmitting device according to claim 1, wherein the reception signal selecting device selects the reception signal, and A voice demodulation device for demodulating a voice signal from a received signal, a control data demodulation device for demodulating the selected control data, and decoding the control data, and setting control data of the reception frequency to the reception signal selection device. An audio information receiving device, comprising: an input switching device for supplying the input switching setting control data; and a control data decoding device for supplying the volume value setting control data to a speaker amplifying device.