JP2009296205A - Local disaster prevention digital radio broadcast system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in a conventional local disaster prevention digital radio broadcast system, there is no other free slot available so that only single broadcast is allowed at a time because five of six slots including a control channel are used for public-address. <P>SOLUTION: Public-address receivers 3 and 5 include memory devices 31 and 51 for recoding voice. Home receivers 4 and 6 include memory devices 41 and 61 for recording voice. Voice information with different contents are respectively recorded in the memory devices 31, 41, 51 and 61. A control signal transmitted from master station radio equipment 2 reproduces the voice recorded in the memory devices 31, 41, 51 and 61 according to a command from a console panel 1. Then, the local disaster prevention digital radio broadcast system can simultaneously perform voice broadcast with different contents to each home receiver without causing line shortage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a municipal disaster prevention digital broadcast radio system that receives information notified by radio from a master station device at a slave station facility and performs loudspeaker broadcasting.

  In a municipal disaster prevention digital broadcast radio system, which is an example of a disaster prevention administrative radio system, a master station device reports signals such as voice or data all at once to a slave station facility by selective calling. Upon receiving this signal, the slave station equipment outputs the reported content to a speaker, a character display device, an information terminal, etc., and transmits the reported information to the local residents.

  In this system, the voice input from the console on the master station device side is encoded by the master station radio device and transmitted as voice data to each slave station. In each slave station, the transmitted voice data is decoded and reported to the local residents as voice.

  The conventional municipal disaster prevention digital broadcast radio system has time slots divided into six times at one frequency (for example, 60 MHz) by the TDMA-TDD system.

  Here, FIG. 10 is a diagram showing a configuration of one frame of an encoded signal transmitted on the same line by the master station radio apparatus in the conventional municipal disaster prevention digital broadcast radio system. In FIG. 10, the number of multiplexing on the radio carrier is 6, and the 6-slot length (80 ms) is the “basic frame”.

  During loudspeaker broadcasting, slot 0 (CH0) is used as a “control slot”, and slots 1, 2, 4, 5 (CH1, CH2, CH4, CH5) are used as “communication slots” for transmitting audio data. in use.

  In the “communication slot”, a voice code encoded by the S system CODEC is inserted. The voice signal input from the console on the master station side is sampled by a sampling signal with a frequency of 16 kHz, and the master station radio device connected to the console performs voice coding with 320 samples as “frame unit”. .

  The master station radio apparatus performs adaptive multiplexing and transmission path encoding on the voice code obtained by voice encoding, thereby transmitting a 512-bit signal as a transmission path code in units of frames. Therefore, it is necessary to use 4 slots as communication slots.

  Also, as a mechanism for blowing the siren sound source built into each slave station equipment and each individual receiver, a control signal for siren ringing is transmitted in the control slot, and as a result, each loudspeaker receiver and Each individual receiver has a function of blowing each siren sound source.

JP 2006-246348 A Municipal Digital Broadcast Communication System Standard ARIB STD-T86 (Radio Industry Association)

  The conventional municipal disaster prevention digital broadcast radio system uses 5 slots including the control channel among the 6 slots when performing loudspeaker broadcasting, and there is no space in the slot, and only one content is broadcast at the same time. I couldn't.

  Therefore, at the same time, when it is necessary to perform audio broadcasting with different contents for each loudspeaker receiver and / or for each individual receiver, the line is insufficient, and such audio broadcasting cannot be performed.

  Moreover, since the sound source incorporated in each loudspeaker receiving device and each individual receiver is only a siren sound source, it is not possible to perform audio broadcasting with different contents for each loudspeaker receiving device and / or for each individual receiver.

  The present invention has been made to solve the above problems, and its purpose is to avoid line congestion and to carry out audio broadcasting with different contents for each loudspeaker receiver and / or for each individual receiver. It is to provide a possible municipal disaster prevention digital broadcast radio system.

  The municipal disaster prevention digital broadcast radio system according to the subject of the present invention includes an operation console and a master station radio device that outputs a control signal wirelessly in accordance with a command from the operation console, each having different contents. A plurality of loudspeaker receivers each having a storage device that records voice information as a voice source, and each of the plurality of loudspeaker receivers is input to a control channel of the control signal received from the master station radio device The voice broadcast is performed by reproducing the voice sound source recorded in the storage device using the voice broadcast start command.

  According to the subject matter of the present invention, it is possible to perform audio broadcasting with different contents for each loudspeaker receiving apparatus in accordance with a control signal from the master station radio apparatus without causing a shortage of lines.

  Hereinafter, various embodiments of the subject of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a municipal disaster prevention digital broadcast radio system according to the present embodiment. In the system of FIG. 1, the master station device side has a console 1 and a master station radio device 2, and the slave station equipment side has a plurality of loudspeaker receivers 3 and 5 and a plurality of door-to-door receivers. 4,6. Each of the loudspeaker receiving devices 3 and 5 includes a communication device (not shown) such as a telephone that can communicate with the master station device.

  The console 1 is an input device for an administrator of the system to input information for performing broadcasting and control, and the master station radio device (master station transmitter) 2 is information transmitted from the console 1. This is a device that encodes (broadcast) and transmits it to the slave station equipment wirelessly. Both devices 1 and 2 are basically the console and master station in the conventional municipal disaster prevention digital broadcasting system. It has the same function as the wireless device.

  The remote control device 7 is a device for inputting a command to the master station radio device 2 via the console 1 in order to broadcast from a remote location, and the district remote control device 8 is remotely connected via a telephone line or the like. This is a device for inputting a command to the master station radio device 2 via the console 1 for broadcasting. A plurality of remote control devices 7 and district remote control devices 8 are installed as necessary.

  The loudspeaker receiving devices 3 and 5 are devices for receiving the information (broadcast) from the master station radio device 2 and performing the loudspeaker broadcast to the local residents through the built-in loudspeaker (not shown). Yes, it is installed throughout the city. Each of the loudspeaker receiving devices 3 and 5 has memory devices (sound source) 31 and 51 capable of recording sound as an example of a storage device. Also, the door-to-door receivers 4 and 6 are installed in the respective doors, etc., receive information (broadcast) from the master station radio device 2, and perform loudspeaking to households of the respective doors by built-in loudspeakers (not shown). It is a device for broadcasting. Each of the individual receivers 4 and 6 has memory devices (sound source) 41 and 61 capable of recording sound as an example of a storage device. As a method for recording sound in each of the memory devices 31, 41, 51, 61, methods such as writing at the time of factory shipment, downloading data on site, or rewriting by air download from the master station are conceivable. At this time, audio information having different contents is recorded in each of the memory devices 31, 41, 51, 61. Then, based on the command from the console 1, the loudspeaker receivers 3 and 5 and the individual receivers according to the voice broadcast start command inputted in the control channel of the control signal sent from the master station radio device 2 Each of 4 and 6 reads out an audio signal recorded in an audio sound source in the corresponding memory device 31, 51, 41, 61 and reproduces the audio signal, thereby executing audio broadcasting of the audio signal.

  Of course, each of the loudspeaker receiving apparatuses 3 and 5 and each of the individual receivers 4 and 6 has a siren sound source (not shown here) as in the conventional case.

  In addition, as means for starting audio broadcasting and stopping audio broadcasting, for example, each control channel of siren report start instruction and siren report release instruction specified in the municipal disaster prevention digital broadcast communication system may be used instead. good.

  When the municipal disaster prevention digital broadcast radio system according to the present embodiment having the above-described configuration is adopted, it is possible to perform audio broadcasting with different contents for each loudspeaker receiving device and each door-to-door receiver. For example, by recording sound indicating different evacuation sites in each area as information in each memory device 31, 41, 51, 61, the evacuation site information corresponding to each area can be instantly handled in the event of a disaster. It is possible to broadcast a loud sound from the loud sound receiving device and the door-to-door receiver.

(Embodiment 2)
The municipal disaster prevention digital broadcast radio system according to the present embodiment basically uses the system configuration of FIG. 1, but in this embodiment, the configuration of each loudspeaker receiving device and each individual receiver is illustrated. This is different from the case of 1. This point is the same in the case of Embodiment 3 described later.

  FIG. 2 is a block diagram showing the configuration of each loudspeaker receiving apparatus employed in the municipal disaster prevention digital broadcast radio system according to the present embodiment. In FIG. 2, the memory devices (which constitute a single sound source) 31, 51 of each of the loudspeaker receiving devices 3 and 5 in FIG. 1 are replaced with a memory device 32 capable of recording a plurality of sounds. That is, as illustrated in FIG. 2, the memory device 32 of the loudspeaker receiving device 3 records the sound corresponding to the broadcast content B, which is different from the broadcast content A, the sound source 1 recording the sound corresponding to the broadcast content A. The sound source 2 that is recording, the sound source 3 that records the sound corresponding to the broadcast content C different from the broadcast content A and B, and the like are stored in the storage area. In the present embodiment, the plurality of sound sources included in each loudspeaker receiving device 3 may be different from each other when viewed from the whole viewpoint. For example, the sound source A of a certain loudspeaker receiving device 3 and the sound source A of another loudspeaker receiving device 3 have different sound contents, but the sound source B of a certain loudspeaker receiving device 3 and some other loudspeaker Even if the sound content of the sound source B of the receiving device 3 is the same as that of the sound source B, as a whole, the plurality of sound sources of both the loudspeaker receiving devices 3 are different from each other as sound information. It can be said.

  FIG. 3 is a block diagram showing the configuration of the individual receivers employed in the municipal disaster prevention digital broadcast radio system according to the present embodiment. In FIG. 3, the memory devices (which constitute a single sound source) 41 and 61 of the individual receivers 4 and 6 in FIG. 1 are replaced with a memory device 42 capable of recording a plurality of sounds. That is, as illustrated in FIG. 3, the memory device 42 of the door-to-door receiver 4 has a sound source 1 that records a sound corresponding to the broadcast content A, and a sound corresponding to the broadcast content B different from the broadcast content B. The sound source 2 that is recording, the sound source 3 that records the sound corresponding to the broadcast content C different from the broadcast content A and B, and the like are stored in the storage area. In the present embodiment, the plurality of sound sources included in each individual receiver 4 may be different from each other when viewed from the overall viewpoint. For example, the sound source A of a certain door-to-door receiver 4 and the sound source A of another door-to-door receiver 4 are the same, but the sound source B of a certain door-to-door receiver 4 and the sound source of another door-to-door receiver 4 are the same. It is assumed that the audio content is different from B.

  Of course, each loudspeaker receiving device 3 and each individual receiver 4 have siren sound sources (not shown here) as in the conventional case.

  FIG. 4 is a block diagram schematically illustrating a configuration example of the loudspeaker receiving device 3 including the memory device 32 capable of recording a plurality of sounds as a main component illustrated in FIG. In FIG. 4, the antenna 39 receives a radio wave transmitted from the master station radio apparatus 2. The receiving unit 38 is a functional unit that demodulates radio waves received by the antenna 39 and demodulates data. The control device 37 controls either the siren sound source 33 composed of a plurality of siren sound sources or the memory device 32 that stores a plurality of sounds in accordance with the data demodulated by the receiving unit 38, and the siren of the siren sound source 33. This is a functional unit that sends out a sound signal or a sound signal read out and output from the memory device 32 to the sound codec 34. The audio codec 34 converts the digital data of any one siren sound source selected from the siren sound source 33 or the digital data of any one sound source selected / output from the memory device 32 into analog form. It is a device that converts it into a siren sound signal or an analog audio signal. The amplifier 35 is a part that amplifies the analog siren sound or analog sound output from the sound codec 34 and drives the loudspeaker 36. The loudspeaker 36 sends out an analog siren sound or analog audio broadcast.

  In the loudspeaker receiving apparatus employed in the conventional municipal disaster prevention digital broadcast radio system, the siren sound source 33 is the only sound source that can be broadcast by control from the master station radio apparatus. However, in the municipal disaster prevention digital broadcast radio system according to the present embodiment, a memory device (an example of a storage device) 32 capable of recording a plurality of sounds in the storage area is added to the siren sound source 33. As a result of being mounted in the loudspeaker receiving device 3, it is possible to provide a plurality of types of audio broadcasts from the loudspeaker receiving device 3 to the residents in the vicinity thereof according to control from the master station radio device 2. Become.

  As an example of controlling the memory device 32, each means of starting audio broadcasting and stopping audio broadcasting includes, for example, a siren notification start instruction and a siren notification release instruction specified in the municipal disaster prevention digital broadcast communication system. Each of the control channels may be substituted.

  In the municipal disaster prevention digital broadcast radio system according to this embodiment, each individual receiver 4 having the configuration illustrated in FIG. 3 has the same configuration as that in FIG.

  FIG. 5 shows a procedure for selecting and reproducing the sound to be amplified for the local residents from among a plurality of sound sources recorded in the memory device 32 of FIG. It is a flowchart. First, the administrator of the system inputs a broadcast content number (n) (hereinafter referred to as “broadcast number (n)”) to be reproduced by each loudspeaker receiving device 3 from the console 1. The master station radio device 2 inputs the command signal indicating the broadcast number (n) and the audio broadcast start command signal input from the console 1 into the control channel of the control signal transmitted on the same line (for example, Refer to the frame configuration example of Fig. 6. In the example of Fig. 6, channels other than channel CH3 are used in communication signals for communication between the console 1 of the master station and a communication device such as a telephone set of a loudspeaker receiver. Therefore, a signal for instructing each loudspeaker receiving apparatus 3 to start audio broadcasting corresponding to the broadcast program (n) is input into the channel CH3 with the vacant channel CH3 as a control channel. ) After modulating the transmission signal, the control signal is transmitted to each of the loudspeaker receiving apparatuses 3 by radio. Each loudspeaker receiver 3 demodulates the received signal, and extracts information on the broadcast number (n) and an audio broadcast start command from the control channel. Then, each loudspeaker receiving device 3 reads out the sound source corresponding to the extracted broadcast number (n) from the storage area of the memory device 32, reproduces the read sound, and through the loudspeaker 36 to the local residents Amplified broadcasting.

  FIG. 7 is a flowchart showing an example of a method of updating the sound source recorded in the memory device 32 in a certain loudspeaker receiving device 3. In FIG. 7, the administrator of this system uses the console 1 to record a sound source corresponding to the nth sound source of the memory device 32 of a certain loudspeaker receiving device 3. There is no need to record the sound source at the console 1, and it is also possible to use a separately recorded sound source. Further, the administrator uses the console 1 to input the slave station number (i) to be updated for the nth sound source. Thereafter, the master station radio device 2 converts the recorded sound source, broadcast number (n), and slave station number (i) into a data transmission format, modulates it, and transmits it to each loudspeaker receiver 3 using radio. To do. As a result, each of the loudspeaker receiving apparatuses 3 demodulates the received signal, and determines whether or not the own station is the station of the slave station number (i) corresponding to the update of the sound source. When the own station is a station that supports updating, the loudspeaker receiving apparatus 3 updates the sound source (rewrites the sound source) in the memory device 32 corresponding to the broadcast number (n).

  4, 5, and 7 describe the case of the loudspeaker receiver, the configuration, the sound reproduction procedure, and the update procedure of the recorded sound source are as described above, and the individual receiver shown in FIG. The same applies to 4.

  According to the municipal disaster prevention digital broadcast radio system according to the present embodiment described above, a plurality of broadcast contents are recorded for each loudspeaker receiver and each individual receiver by a control signal from the master station radio apparatus. It is possible to select and perform audio broadcasting. For example, if the evacuation location is different for each disaster type, more specifically, the evacuation location is usually different between an earthquake and a tsunami. While broadcasting content A, in the case of a tsunami, broadcast content B is broadcasted by issuing a command to broadcast audio in the second of the audio memory, so that all the slave stations and all households can be urgently broadcast according to circumstances. The content to be broadcast can be selected.

(Embodiment 3)
FIG. 8 is a block diagram showing a configuration example of each loudspeaker receiving apparatus in the municipal disaster prevention digital broadcast radio system according to the present embodiment. As understood from a comparison between FIG. 8 and FIG. 4, in each of the loudspeaker receivers of this embodiment, the control device 37, the memory device 32, and the siren sound source in the second embodiment illustrated in FIG. 33 is provided with a selection unit 301.

  FIG. 9 is a diagram for explaining the present embodiment. As shown in FIG. 9, a) the loudspeaker receivers A, B, C, and D broadcast the sound of the sound source 1 when a fire occurs, and b) the loudspeaker receivers A and C receive the sound source when an earthquake occurs. While the sound receiving device B, D broadcasts the sound source 2, the sound receiving device A, B broadcasts the sound of the sound source 1, while the sound receiving device C, when the tsunami occurs. , D is assumed to broadcast the sound of the sound source 2. In this case, in the method of the second embodiment, since the sound source number to be reproduced is directly transmitted from the master station radio apparatus 2, the master station radio apparatus 2 receives each loudspeaker according to the type of disaster. It was necessary to individually transmit the number of the sound source to be broadcast by the device 3. For this reason, the number of transmissions increases, and there is a possibility that a delay in starting the broadcast occurs. As a method for avoiding this, based on the example of FIG. 9, the loudspeaker receiving apparatus A may conceivably record three sound sources 1 for fire, earthquake, and tsunami. However, since this method requires three times the memory capacity, it causes an increase in hardware.

  Therefore, in the present embodiment, the selection unit 301 is mounted in each loudspeaker receiving device 3, and in the example of FIG. 9, the loudspeaker receiving device A uses the selection unit 301 to select any of fire, earthquake, and tsunami. Even at this time, by selecting the sound source 1, the sound of the sound source 1 is reproduced. On the other hand, the loudspeaker B uses the selection unit 301 to select the sound source 1 in the case of fire and tsunami and reproduce / broadcast the sound of the sound source 1, while in the case of an earthquake, The sound source 2 is selected by the selection unit 301 to reproduce / broadcast the sound of the sound source 2. In this way, a conversion table (for example, a look-up table) 301T that defines a correspondence relationship between a sound enhancement pattern and a sound source stored in the storage device of the sound reception device is set in the sound reception device 3 in advance. By implementing the selection unit 301 provided, it is possible to reduce the communication capacity and the memory capacity of the loudspeaker receiving apparatus as compared with the method of the second embodiment.

  A loudspeaker pattern No. 1 indicating an earthquake, tsunami, fire, or the like from the console 1 of FIG. Is input, and the master station radio device 2 receives the loudspeaker pattern No. input from the console 1. Is input to the control channel in the frame of the control signal together with the audio broadcast start command and transmitted wirelessly, and the antenna 39 in FIG. 8 receives the control signal. Then, the control device 37 of FIG. And an audio broadcast start command signal are extracted, Is output to the selection unit 301. The selection unit 301 selects the loudspeaker pattern No. output from the control device 37. Based on the conversion table 301T. Convert to For example, the selection unit 301 selects the sound source 1 when the sound pattern is 1 and selects the sound source 2 when the sound pattern is 2 or 3. The selection unit 301 selects the sound source No. output from the conversion table 301T. Is read out from the storage area of the memory device 32 and output, and the audio codec 34 converts the digital audio output from the memory device 32 into analog audio. The amplifier 35 amplifies the output of the audio codec 34, and the speaker 36 outputs the audio source No. output from the memory device 32. Amplified broadcasting of audio signals.

  In the above description, the case of the loudspeaker receiver is described. However, by installing a selection unit having the same conversion table between the control device and the storage device in each individual receiver, the individual receiver Of course, the same actions and effects can be obtained with respect to the above.

(Appendix)
While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. In other words, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention.

It is a block diagram which shows the structural example of the municipalities disaster prevention digital broadcast radio system which concerns on Embodiment 1 of this invention. It is a figure which shows typically the structural example of the loudspeaker receiver in Embodiment 2 of this invention. It is a figure which shows typically the structural example of the door-to-door receiver in Embodiment 2 of this invention. It is a block diagram which shows the internal structural example of the loud reception apparatus which concerns on Embodiment 2 of this invention. It is a flowchart which shows the procedure which reproduces | regenerates the audio | voice which should be loudly amplified from several audio | voice sound sources in each loudspeaker receiving apparatus of the municipal disaster prevention digital broadcast radio | wireless system which concerns on Embodiment 2 of this invention. It is a figure which shows the example of a frame structure of the municipalities disaster prevention digital broadcast radio system of this invention. It is a flowchart which shows an example of the update method of the audio | voice sound source recorded in the memory apparatus in the loudspeaker receiver 3 with the municipal disaster prevention digital broadcast radio system which concerns on Embodiment 2 of this invention. It is a block diagram which shows the internal structural example of the loudspeaker receiver which concerns on Embodiment 3 of this invention. It is a figure for demonstrating the content of Embodiment 3 of this invention. It is a figure which shows the example of a flame | frame structure of the conventional municipalities disaster prevention digital broadcast radio system.

Explanation of symbols

  A frame structure, 1 console, 2 master station radio device, 3 loudspeaker receiver, 31 memory device, 32 memory device, 33 siren sound source, 34 audio codec 35 amplifier 36 loudspeaker, 37 control device, 38 wireless receiver, 39 Antenna, 301 selection unit, 301T conversion table, 4 door-to-door receiver, 41 memory device, 42 memory device, 5 loudspeaker receiving device, 51 memory device, 6 door-to-side receiver, 61 memory device, 7 remote control device, 8 area remote control apparatus.

Claims (8)

Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of loudspeaker receivers having a storage device for recording audio information of different contents as a sound source,
Each of the plurality of loudspeaker receiving apparatuses reproduces an audio sound source recorded in the storage device by using an audio broadcast start command input to a control channel of the control signal received from the master station radio apparatus. And audio broadcasting
Municipal disaster prevention digital broadcast radio system. Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of loudspeaker receivers having a storage device for recording audio information of different contents,
The storage device of each loudspeaker receiving device stores a plurality of sound sources having different contents as the sound information of the storage device,
Each of the plurality of loudspeaker receiving devices uses the broadcast number input in the control channel of the control signal received from the master station radio device and the audio broadcast start command of the broadcast program, and uses the storage device. Selecting and playing one audio source corresponding to the broadcast number from the plurality of audio sources stored in the program, and performing audio broadcasting of the selected audio source,
Municipal disaster prevention digital broadcast radio system. A municipal broadcast digital broadcasting radio system according to claim 2,
In response to a command from the console, the base station radio device outputs a data transmission signal that gives the newly recorded audio source, the number of the loudspeaker receiving device to be updated, and the broadcast number to be updated,
Each of the plurality of loudspeaker receiving devices that have received the data transmission signal determines whether or not the number of the loudspeaker receiving device matches the number of the target loudspeaker receiving device. Rewriting the sound source corresponding to the broadcast number to be updated from the plurality of sound sources stored in the storage device of the loudspeaker receiving device to the newly recorded sound source,
Municipal disaster prevention digital broadcast radio system. Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of loudspeaker receiving devices having a storage device and a selection unit for recording audio information of different contents,
The storage device of each loudspeaker receiving device stores at least one sound source as the sound information of the storage device,
The selection unit of each loudspeaker receiving device has a conversion table that defines the correspondence between the loudspeaking pattern and the sound source stored in the storage device of the loudspeaker receiving device,
The selection unit of each of the plurality of loudspeaker receiving devices selects, from the conversion table, a sound source corresponding to a loudspeaker pattern input in a control channel of the control signal received from the master station wireless device, and selects The voice sound source is read from the storage device of the loudspeaker receiving device, and the loudspeaker receiving device reproduces the voice sound source read from the storage device, thereby performing voice broadcasting of the selected voice sound source. To
Municipal disaster prevention digital broadcast radio system. Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of door-to-door receivers having a storage device that records audio information of different contents as a sound source;
Each of the plurality of individual receivers reproduces the sound source recorded in the storage device by using a sound broadcast start command input to the control channel of the control signal received from the master station wireless device. And audio broadcasting
Municipal disaster prevention digital broadcast radio system. Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of door-to-door receivers having storage devices for recording audio information of different contents,
The storage device of each door-to-door receiver stores a plurality of sound sources having different contents as the sound information of the storage device,
Each of the plurality of door-to-door receivers uses the broadcast number input in the control channel of the control signal received from the master station radio device and the audio broadcast start command for the broadcast program, Selecting and playing one audio source corresponding to the broadcast number from the plurality of audio sources stored in the program, and performing audio broadcasting of the selected audio source,
Municipal disaster prevention digital broadcast radio system. A municipal disaster prevention digital broadcast radio system according to claim 6,
In response to a command from the console, the base station wireless device outputs a data transmission signal that gives the newly recorded audio source, the number of the individual receiver to be updated, and the broadcast number to be updated,
Each of the plurality of household receivers that have received the data transmission signal determines whether or not the number of the household receiver matches the number of the household receiver to be updated. Rewriting the sound source corresponding to the broadcast number to be updated from the plurality of sound sources stored in the storage device of the individual receiver to the newly recorded sound source,
Municipal disaster prevention digital broadcast radio system. Console,
A master station wireless device that wirelessly outputs a control signal in response to a command from the console;
Each comprising a plurality of door-to-door receivers having a storage device and a selection unit for recording audio information of different contents,
The storage device of each individual receiver stores at least one sound source as the sound information of the storage device,
The selection unit of each door-to-door receiver has a conversion table that defines a correspondence relationship between a loudspeaking pattern and a sound source stored in the storage device of the door-to-door receiver,
The selection unit of each of the plurality of individual receivers selects, from the conversion table, a sound source corresponding to a loudspeaker pattern input in a control channel of the control signal received from the master station radio device, and selects The audio source is read from the storage device of the door-to-door receiver, and the door-to-door receiver plays the audio sound source read from the storage device, thereby performing audio broadcasting of the selected sound source. To
Municipal disaster prevention digital broadcast radio system.

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