JP7170797B1 - Wireless communication system and wireless communication device - Google Patents

Abstract

A wireless communication system is provided which can solve the problems in conventional examples 2 and 3, and which can be installed in a much simpler manner than the conventional example when expanding.
A wireless communication system includes a first wireless communication subsystem including at least one first wireless device (1) and a first repeater (2) for wireless communication with each first wireless device (1). , a second radio communication subsystem including at least one second radio 1 and a second repeater 2 in radio communication with each second radio 1 . After receiving the radio signal from each first radio device 1, the first repeater 2 demodulates the audio signal, adds a plurality of audio signals, and modulates the radio signal according to the added audio signal. is generated and transmitted to each of the first and second radios 1 . After receiving the radio signal from each second radio 1, the second repeater 2 demodulates the audio signal, adds a plurality of audio signals, and modulates the radio signal according to the added audio signal. is generated and transmitted to each of the first and second radios 1 .
[Selection drawing] Fig. 1

Description

The present invention is, for example, a radio communication device for simultaneous relay calls for a specified low-power radio station, comprising a radio communication device (wireless handset) connected to a radio relay device (relay) and a plurality of radio communication devices. and a wireless communication system including a wireless relay device.

(Conventional example 1)
FIG. 4 is a block diagram showing a configuration example of a radio communication system according to Conventional Example 1. In FIG. FIG. 4 shows a wireless communication system comprising two wireless communication subsystems 61 and 62 that are independent of each other. The wireless communication subsystem 61 is composed of three wireless devices (wireless slave devices) 51-1 to 51-3 and one repeater 2-1, and the wireless communication subsystem 62 is composed of three wireless 51-4 to 51-6 and one repeater 2-2.

Here, each of the wireless devices 51-1 to 51-6 (generally denoted by reference numeral 1) includes a receiving antenna (not shown), a receiving demodulator 12, a speaker 16, a microphone 21, a modulation transmission and a transmitting antenna (not shown). In addition, each repeater 2-1 to 2-2 (generically denoted by reference numeral 2) includes a receiving antenna (not shown), receiving demodulators 32, 33, and 34, an adder 35, and modulation transmission and a transmitting antenna (not shown). In each repeater 2-1 to 2-2, each reception demodulator 32 to 34 demodulates each radio signal received by the receiving antenna into an audio signal, and the demodulated audio signal is added by an adder 35. , and the added audio signal is output to the modulation transmission unit 37 . The modulation transmitter 37 modulates a radio carrier wave with a predetermined modulation method such as FM according to an input audio signal to generate a transmission radio signal, which is transmitted from a transmission antenna.

In FIGS. 4, 5, 6 and 1, the transmission frequencies used are indicated on the right side of each modulation transmission section 23, 37 (TX). For example, 454 (A) indicates 454 MHz band channel A. In addition, the reception frequency used is indicated on the right side of each reception demodulation section 12, 32 to 34, 34A (RX). For example, 413(1) indicates 413 MHz band channel 1. These used frequencies are examples. Furthermore, in FIGS. 4, 5, 6 and 1, dotted lines indicate connections by wireless lines, and solid lines indicate connections by wired lines.

Extending and combining the two wireless communication subsystems 61, 62 of FIG. 4 with each other will now be described.

(Conventional example 2)
FIG. 5 is a block diagram showing a configuration example of a radio communication system according to Conventional Example 2 disclosed in Patent Document 1. As shown in FIG. In the conventional example 1, in order to increase the number of radio devices 1 for relay simultaneous communication, as shown in FIG. The external terminal 42 (input terminal of the adder 35) of the repeater 2-2 of the expansion destination is connected by the audio signal line 40, and the radio signal transmitted from the modulation transmission section 37 of the repeater 2-2 is transmitted to each radio. received by the machine 1.

However, in this expansion method, it is necessary to connect the repeaters 2-1 and 2-2 with the wired audio signal line 40, and installation work for the wired audio signal line 40 and restrictions on the installation work (location However, there is a problem that

Next, a method for solving this problem of Conventional Example 2 will be described below.

(Conventional example 3)
FIG. 6 is a block diagram showing a configuration example of a wireless communication system according to Conventional Example 3 disclosed in Patent Document 2. As shown in FIG. The radio communication system of FIG. 6 has the following differences compared to the radio communication system of FIG.
(1) Instead of the wireless communication subsystem 62, a wireless communication subsystem 62A is provided.
(2) In the wireless communication subsystem 62A, in order to eliminate the connection through the wired audio signal line 40 in the conventional example 2, the extension destination repeater 2-2 is provided with a reception demodulator 34A, which is an additional reception circuit. Here, the reception demodulation unit 34A receives the radio signal from the modulation transmission unit 37 of the extension source repeater 2-1 and demodulates it into an audio signal.
(3) An adder 35A is provided instead of the adder 35 in the radio communication subsystem 62A. The adder 35A adds the audio signal demodulated by the reception demodulator 34A to the demodulated audio signals from the reception demodulators 32 to 34, and outputs the resulting audio signal to the modulation transmitter 37. .

Japanese Patent No. 4812711 (Fig. 2) Japanese Patent No. 4805241 (Figs. 2 and 3)

Association of Radio Industries and Businesses, "Radio Equipment Standards for Land Mobile Service Radio Stations (for Work Communication) with Antenna Power of 1mW or Less", RCR STD-31, Version 4.0, Established July 31, 1992, 2020 4.0 revision on September 28 (pages 11 to 14, Tables 3-1 to 3-3)

However, in the method according to Conventional Example 3, when operating in a channel of a frequency band for simultaneous calls that are commonly used (see, for example, Non-Patent Document 1), only two frequency bands, uplink and downlink, can be used. Therefore, the repeater 2A-2, to which another receiving circuit (receiving demodulator 34A) is added, transmits and receives using the channel of the same frequency band. That is, since the repeater 2A-2 receives the 454 MHz band channel A and transmits the 454 MHz band channel B, the transmission frequency and the reception frequency become very close to each other, and the reception demodulator 34A strongly suppresses the sensitivity. receive. As a result, the radio performance is remarkably degraded, and more specifically, the reception sensitivity is degraded and the quality of the received voice is degraded. As a result, at present, the method according to Conventional Example 3 has not been put into practical use as a product.

An object of the present invention is to
(1) Problems in conventional example 2 such as the installation work of the wired audio signal line 40 and the restrictions on the installation work (restrictions such as location),
(2) In conventional example 3, since the reception by another receiving circuit is greatly affected by the transmitted wave, the radio performance is remarkably degraded.
A new wireless communication device for simultaneous relay calls, which can solve problems at the same time and requires extremely simple installation work at the time of expansion compared to the conventional example, and which is connected to a wireless relay device (repeater). An object of the present invention is to provide a device (wireless slave device) and a wireless communication system including a plurality of wireless communication devices and wireless relay devices.

A wireless communication system according to an aspect of the present invention includes:
a first wireless communication subsystem including one or more first wireless communication devices and a first wireless relay device that wirelessly communicates with each of the first wireless communication devices;
A wireless communication system comprising one or more second wireless communication devices and a second wireless communication subsystem including a second wireless relay device that wirelessly communicates with each of the second wireless communication devices There is
After receiving the radio signal from each of the first radio communication devices, the first radio relay device demodulates the audio signal, adds a plurality of audio signals, and modulates a radio carrier according to the added audio signal. By doing so, a radio signal is generated and transmitted to each of the first and second radio communication devices,
After receiving the radio signal from each of the second radio communication devices, the second radio relay device demodulates the audio signal, adds the plurality of audio signals, and modulates the radio carrier according to the added audio signal. By doing so, a radio signal is generated and transmitted to each of the first and second radio communication devices,
Each of the first wireless communication devices,
a first modulation transmission unit that modulates a radio carrier according to an input audio signal to generate a radio signal and transmits the radio signal to the first radio repeater;
a first receiving and demodulating unit that receives a radio signal from the first radio relay device and demodulates it into an audio signal;
a second reception demodulation unit that receives a radio signal from the second radio relay device and demodulates it into an audio signal;
Each of the second wireless communication devices,
a second modulation transmitter that modulates a radio carrier according to an input audio signal to generate a radio signal and transmits the radio signal to the second radio repeater;
a third receiving and demodulating unit that receives a radio signal from the first radio relay device and demodulates it into an audio signal;
A radio communication system comprising: a fourth receiving and demodulating section that receives a radio signal from the second radio repeater and demodulates it into an audio signal.

Therefore, according to the radio communication system of the present invention, since each radio communication apparatus further includes a reception demodulator for receiving a radio signal from another radio relay apparatus to which each radio communication apparatus does not belong, the problems in the conventional examples 2 and 3 are eliminated. It is possible to provide a new radio communication device for simultaneous relay calls, etc., which can solve the problems at the same time and the installation work for expansion is extremely simple as compared with the conventional example.

1 is a block diagram showing a configuration example of a wireless communication system according to an embodiment; FIG. 2 is a block diagram showing a configuration example of the wireless device 1 of FIG. 1; FIG. 2 is a block diagram showing a configuration example of a repeater 2 of FIG. 1; FIG. 1 is a block diagram showing a configuration example of a radio communication system according to Conventional Example 1; FIG. FIG. 11 is a block diagram showing a configuration example of a radio communication system according to Conventional Example 2; FIG. 12 is a block diagram showing a configuration example of a wireless communication system according to Conventional Example 3;

Hereinafter, embodiments and modifications according to the present invention will be described with reference to the drawings. In addition, the same code|symbol is attached|subjected about the same or similar component.

(Inventor's findings)
FIG. 1 is a block diagram showing a configuration example of a wireless communication system according to an embodiment. In order to propose a new radio communication device for simultaneous relay calls, which can simultaneously solve the problems of the conventional examples 2 and 3, and which is extremely easy to install when expanding compared to the conventional example, the conventional example 2 without using the wired audio signal line 40, without increasing the number of receiving circuits of the repeater 2 as in the conventional example 3, and using the same transmission frequency band and reception frequency band in the same wireless communication subsystem 62. Without use, the embodiment of FIG. 1 is characterized by having the following configuration.
(A) Each of the radios 1-1 to 1-6 faces the modulation transmitters 37, 37 of each repeater 2-1, 2-2, and receives the radio signal from the modulation transmitters 37, 37. is provided with a plurality of reception demodulators 12 and 13 for receiving .
(B) Each repeater 2-1, 2-2 faces correspondingly the modulation transmitter 23, 23 of the wireless device (1-1 to 1-3; 1-4 to 1-6) to which it belongs. , and a plurality of reception demodulators 32, 33, 34 for receiving radio signals from the modulation transmitters 23, 23, respectively.

With the above two configurations, the two repeaters 2-1 and 2-2 and the six wireless devices 1-1 to 1-6 are provided under the necessary and sufficient conditions and with the minimum configuration, and each wireless device 1 -1 to 1-6 can be configured to receive voice signals of radio signals from respective wireless devices 1-1 to 1-6 different from the own wireless device.

(Embodiment)
In FIG. 1, as described above, like FIGS. 4 to 6, dotted lines indicate connections by wireless lines, and solid lines indicate connections by wired lines.

1, the wireless communication system of FIG. 1 includes two wireless communication subsystems 61,62. Here, the wireless communication subsystem 61 is composed of three wireless devices (wireless slave devices) 1-1 to 1-3 and one repeater 2-1. It is composed of radio units (radio slave units) 1-4 to 1-6 and one repeater 2-2. That is, the three wireless devices 1-1 to 1-3 of the wireless communication subsystem 61 belong to the repeater 2-1 and are configured to be able to transmit and receive with the repeater 2-1, and the three wireless devices 1-1 to 1-3 of the wireless communication subsystem 62 The wireless devices 1-4 to 1-6 are configured to be able to transmit and receive with the repeater 2-2.

Here, each radio device 1-1 to 1-6 (generally denoted by reference numeral 1) includes a receiving antenna (not shown), receiving demodulators 12 and 13, a speaker 16, a microphone 21, It comprises a modulation transmitter 23 and a transmission antenna (not shown). 1, the adder 14 and audio signal amplifiers 15 and 22 (see FIG. 2) of each radio 1-1 to 1-6 are omitted for convenience of illustration.

In addition, each repeater 2-1 to 2-2 (generically denoted by reference numeral 2) includes a receiving antenna (not shown), receiving demodulators 32, 33, and 34, an adder 35, and modulation transmission and a transmitting antenna (not shown). 1, the illustration of the audio signal amplifier 36 (see FIG. 3) of each repeater 2-1 to 2-2 is omitted for convenience of illustration. In each repeater 2-1 to 2-2, each reception demodulator 32 to 34 demodulates each radio signal received by the receiving antenna into an audio signal, and the demodulated audio signal is added by an adder 35. , and the added audio signal is output to the modulation transmission unit 37 . The modulation transmitter 37 modulates a radio carrier wave with a predetermined modulation method such as FM according to an input audio signal to generate a transmission radio signal, which is transmitted from a transmission antenna.

It should be noted that the transmission directivity of the transmission antenna of the modulation transmitter 37 of each repeater 2 covers the areas of the wireless communication subsystems 61 and 62, and the radio signal transmitted from the repeater 2-1 is the wireless device 1. -1 to 1-3 reception demodulators 12 and radio receivers 1-4 to 1-6 receive demodulators 13, and the radio signal transmitted from the repeater 2-2 is 1 to 1-3, and reception demodulation units 12 of wireless devices 1-4 to 1-6.

FIG. 2 is a block diagram showing a configuration example of the wireless device 1 of FIG. Here, the wireless device 1 is an example of a wireless communication device.

2, the wireless device 1 includes a control unit 10, a receiving antenna 11, receiving demodulators 12 and 13, an adder 14, an audio signal amplifier 15, a speaker 16, and an operation unit 20 including a PTT key 20A. , a microphone 21 , an audio signal amplifier 22 , a modulation transmitter 23 and a transmission antenna 24 .

In FIG. 2, a radio signal received by a receiving antenna 11 is input to receiving demodulators 12 and 13 having different receiving frequencies (channels). Each reception demodulator 12, 13 performs low noise amplification, low frequency conversion, intermediate frequency amplification, etc. on the received radio signal, and then performs predetermined demodulation such as FM (frequency modulation) demodulation or PM (phase modulation) demodulation. is demodulated into an audio signal by the demodulation method of , and output to the adder 14 . The adder 14 adds the two input audio signals and then outputs the resulting audio signal to the speaker 16 via the audio signal amplifier 15 .

The microphone 21 converts an input voice into a voice signal and outputs the voice signal to the modulation transmitter 23 via the voice signal amplifier 22 . When the PTT key 20A is turned on, the control unit 10 operates the modulation transmission unit 23. The modulation transmission unit 23 modulates the radio carrier wave according to the input audio signal with a predetermined modulation method, and then modulates the modulated radio wave. A radio signal, which is a carrier wave, is transmitted from the transmission antenna 24 after high-frequency conversion and power amplification.

FIG. 3 is a block diagram showing a configuration example of the repeater 2 of FIG. Here, the repeater 2 is an example of a wireless repeater.

In FIG. 3, the repeater 2 comprises a reception antenna 31, reception demodulators 32, 33, 34, an adder 35, an audio signal amplifier 36, a modulation transmitter 37, and a transmission antenna 38. be.

In FIG. 3, radio signals received by a receiving antenna 31 are input to receiving demodulators 32, 33, and 34 having different receiving frequencies (channels). Each reception demodulation unit 32, 33, 34 performs low noise amplification, low frequency conversion, intermediate frequency amplification, etc. on the received radio signal, and then performs, for example, FM (frequency modulation) demodulation or PM (phase modulation) demodulation. is demodulated into an audio signal by a predetermined demodulation method and output to the adder 35 . The adder 35 adds the three input audio signals, and then outputs the resultant audio signal to the modulation transmitter 37 via the audio signal amplifier 36 . The modulation transmission unit 37 modulates a radio carrier wave according to an input audio signal by a predetermined modulation method such as FM (frequency modulation) modulation or PM (phase modulation) modulation, and then transmits the radio signal, which is the modulated radio carrier wave, After high frequency conversion and power amplification, the signal is transmitted from the transmission antenna 38 .

In the radio communication subsystem 61 configured as described above, the transmission frequency of the modulation transmission unit 37 of the repeater 2-1 is the reception frequency of the reception demodulation unit 12 of each radio 1-1 to 1-3 and each radio The radio signal from the modulation transmission unit 37 of the repeater 2-1 is the same as the reception frequency of the reception demodulation unit 13 of the radio equipment 1-4 to 1-6, and the reception demodulation of each radio equipment 1-1 to 1-3 After being received by the unit 12, it is demodulated into an audio signal and output from the speaker 16. After being received by the reception demodulation unit 13 of each of the wireless devices 1-4 to 1-6, it is demodulated into an audio signal and output from the speaker. 16 is output. Further, each transmission frequency of the modulation transmission section 23 of each radio 1-1 to 1-3 is the same as the reception frequency of the corresponding reception demodulation section 32 to 34 of the repeater 2-1,
(1) After the radio signal from the modulation transmission unit 23 of the radio device 1-1 is received by the reception demodulation unit 32 of the repeater 2-1, it is demodulated into an audio signal and output to the adder 35,
(2) After the radio signal from the modulation transmission unit 23 of the radio device 1-2 is received by the reception demodulation unit 33 of the repeater 2-1, it is demodulated into an audio signal and output to the adder 35,
(3) After the radio signal from the modulation transmission section 23 of the radio device 1-3 is received by the reception demodulation section 34 of the repeater 2-1, it is demodulated into an audio signal and output to the adder 35.
After the three audio signals input to the adder 35 are added, the added audio signal is input to the modulation transmitter 37, which modulates the radio carrier according to the input audio signal, Transmit a modulated radio signal.

Further, in the radio communication subsystem 62, the transmission frequency of the modulation transmission section 37 of the repeater 2-2 is the same as the reception frequency of the reception demodulation section 12 of each of the wireless devices 1-4 to 1-6. -2 is received by the reception demodulator 12 of each of the radios 1-4 to 1-6, demodulated into an audio signal and output from the speaker 16, and each radio After being received by the receiving and demodulating units 13 of the devices 1-1 to 1-3, the signals are demodulated into audio signals and output from the speakers 16. FIG. Further, each transmission frequency of the modulation transmission section 23 of each radio 1-4 to 1-6 is the same as the reception frequency of the corresponding reception demodulation section 32 to 34 of the repeater 2-2,
(1) After the radio signal from the modulation transmission unit 23 of the radio device 1-4 is received by the reception demodulation unit 32 of the repeater 2-2, it is demodulated into an audio signal and output to the adder 35,
(2) After the radio signal from the modulation transmission unit 23 of the radio 1-5 is received by the reception demodulation unit 33 of the repeater 2-2, it is demodulated into an audio signal and output to the adder 35,
(3) After the radio signal from the modulation transmission section 23 of the radio 1-6 is received by the reception demodulation section 34 of the repeater 2-2, it is demodulated into an audio signal and output to the adder 35.
After the three audio signals input to the adder 35 are added, the added audio signal is input to the modulation transmitter 37, which modulates the radio carrier according to the input audio signal, Transmit a modulated radio signal.

As described above, according to the present embodiment, the number of reception demodulators 12 and 13 of the wireless device 1 is the same as the number of repeaters 2, so that the reception demodulators 12 and 13 of each wireless device 1 receives all the radio signals transmitted from each repeater 2, adds the audio signals received and demodulated by each radio 1, and outputs the result from the speaker 16. - 特許庁As a result, in this embodiment, the degree of freedom in installing the repeater 2 is improved compared to the expansion method using the wired audio signal line 40 according to the conventional example 2 (see FIG. 5). In addition, the present embodiment does not cause the problem of "reduction in wireless performance" in the expansion method (see FIG. 6) that adds the reception demodulation unit 34A to the repeater 2 according to the conventional example 3. It is possible to easily expand the wireless slave units of the system.

That is, according to this embodiment, the problems in the conventional examples 2 and 3 can be solved at the same time, and the installation work for expansion is extremely simple compared to the conventional example. A device and a wireless communication system can be provided that includes a plurality of wireless communication devices.

(Modification)
In the above embodiment, a wireless communication system is described in which two wireless communication subsystems 61 and 62 including two repeaters 2 and three wireless devices 1 per repeater are combined. is not limited to this, and may be configured as follows.
(1) A wireless communication system may be configured by combining two wireless communication subsystems each including two repeaters 2 and one, two, or four or more wireless devices 1 per repeater. .
(2) A wireless communication system may be configured by integrating three or more wireless communication subsystems including three or more repeaters 2 and one or more wireless devices 1 per repeater.
(3) Therefore, a wireless communication system may be configured by combining a plurality of wireless communication subsystems each including a plurality of repeaters 2 and one or a plurality of wireless devices 1 per repeater. At this time, each repeater 2 includes one modulation transmitter 37 for transmitting radio signals to all the radios 1, and the same number of reception demodulators as the radios 1 belonging to the repeater 2. 32 to 34, etc., and includes reception demodulators 32 to 34, etc. for receiving radio signals from the wireless device 1 belonging to the repeater 2. FIG. Each wireless device 1 has one modulation transmitter 23 for transmitting a wireless signal to the relay 2 to which it belongs, and the same number of reception demodulators 12, 13 as the number of all the relays 2. and reception demodulators 12 and 13 for receiving radio signals from each repeater 2 .

As described in detail above, according to the radio communication system of the present invention, since each radio communication device further includes a reception demodulator for receiving a radio signal from another radio relay device to which each radio communication device does not belong, conventional example 2 and 3 can be solved at the same time, and a new radio communication device or the like for simultaneous relay calls can be provided, in which the installation work for expansion is extremely simple compared to the conventional example. In particular, the wireless communication device according to the present invention is suitable for the wireless device of the specified low-power wireless station specified in Non-Patent Document 1 and the like.

1, 1-1 to 1-6 wireless device (wireless slave device; wireless communication device)
2, 2-1 to 2-2 repeaters (radio repeaters)
10 Control Unit 11 Receiving Antennas 12, 13 Receiving Demodulator 14 Adder 15 Audio Signal Amplifier 16 Speaker 20 Operation Unit 20A PTT Key 21 Microphone 22 Audio Signal Amplifier 23 Modulation Transmitter 24 Transmitting Antenna 31 Receiving Antennas 32, 33, 34, 34A Receiving demodulators 35, 35A Adder 36 Audio signal amplifier 37 Modulation transmitter 38 Transmitting antenna 40 Audio signal lines 41, 42 External terminals 51-1 to 51-6 Wireless device (wireless slave device; wireless communication device)
61, 62, 62A wireless communication subsystem

Claims (6)

a first wireless communication subsystem including one or more first wireless communication devices and a first wireless relay device that wirelessly communicates with each of the first wireless communication devices;
A wireless communication system comprising one or more second wireless communication devices and a second wireless communication subsystem including a second wireless relay device that wirelessly communicates with each of the second wireless communication devices There is
After receiving the radio signal from each of the first radio communication devices, the first radio relay device demodulates the audio signal, adds the plurality of audio signals, and determines a predetermined first radio signal according to the added audio signal. generating a radio signal by modulating a radio carrier having a radio frequency of and transmitting it to each of the first and second radio communication devices;
After receiving the radio signal from each of the second radio communication devices, the second radio relay device demodulates the audio signal, adds the plurality of audio signals, and converts the first radio signal according to the added audio signal. generating a radio signal by modulating a radio carrier having a predetermined second radio frequency different from the radio frequency and transmitting the radio signal to each of the first and second radio communication devices;
Each of the first wireless communication devices,
A radio frequency selected from a radio frequency band different from the radio frequency band of the first radio frequency and the second radio frequency according to an input audio signal and different from each other in each of the first radio communication devices a first modulation transmitter that modulates a radio carrier having a predetermined third radio frequency to generate a radio signal and transmit the radio signal to the first radio relay device;
a first receiving and demodulating unit that receives a radio signal from the first radio relay device and demodulates it into an audio signal;
a second reception demodulation unit that receives a radio signal from the second radio relay device and demodulates it into an audio signal;
Each of the second wireless communication devices,
a radio frequency selected from a radio frequency band different from the radio frequency band of the first radio frequency and the second radio frequency according to an input audio signal and different from the third radio frequency, and a second modulation transmitter for generating a radio signal by modulating a radio carrier having a predetermined fourth radio frequency different from each other in each of the second radio communication devices and transmitting the radio signal to the second radio relay device; ,
a third receiving and demodulating unit that receives a radio signal from the first radio relay device and demodulates it into an audio signal;
a fourth receiving and demodulating unit that receives a radio signal from the second radio relay device and demodulates it into an audio signal ;
A radio communication system , wherein the first radio frequency and the second radio frequency are in the same radio frequency band, and the third radio frequency and the fourth radio frequency are in the same radio frequency band . The first wireless relay device,
the same number of fifth receiving and demodulating units as the number of the first wireless communication devices, which receive radio signals from the first wireless communication devices and demodulate them into voice signals;
a first adder that adds the audio signals from each of the fifth reception demodulators and outputs an added audio signal;
A third radio signal is generated by modulating a radio carrier according to the audio signal after addition from the first adder, and is transmitted to each of the first radio communication devices and the second radio communication devices. a modulation transmitter,
The second radio relay device,
the same number of sixth receiving and demodulating units as the number of the second wireless communication devices, which receive radio signals from the second wireless communication devices and demodulate them into voice signals;
a second adder that adds the audio signals from each of the sixth receiving and demodulating units and outputs the added audio signal;
A fourth method for generating a radio signal by modulating a radio carrier according to the added audio signal from the second adder and transmitting the radio signal to each of the first radio communication devices and the second radio communication devices. A wireless communication system according to claim 1, comprising a modulation transmitter. A radio communication device for a radio communication system according to claim 1 or 2,
A wireless communication device, wherein the wireless communication device is the first wireless communication device or the second wireless communication device. A wireless communication system comprising a plurality of N wireless communication subsystems each including one or more wireless communication devices and a wireless relay device that performs wireless communication with each wireless communication device,
N is an integer of 3 or more,
The radio relay apparatus included in each radio communication subsystem receives a radio signal from each radio communication apparatus included in the same radio communication subsystem including the radio relay apparatus, demodulates the audio signal, and and modulating a radio carrier wave having a predetermined first radio frequency different from each other in each of the radio communication subsystems according to the added audio signal to generate a radio signal, transmitting to each wireless communication device included in a communication subsystem and to each wireless communication device included in a plurality of wireless communication subsystems different from the same wireless communication subsystem;
each wireless communication device,
A radio having a predetermined second radio frequency selected from a radio frequency band different from the radio frequency band of the first radio frequency according to an input audio signal and different from each other in each of the radio communication devices. a first modulating transmitter that modulates a carrier wave to generate a radio signal and transmits the radio signal to a radio repeater included in the same radio communication subsystem;
a first receiving and demodulating unit that receives a radio signal from a radio repeater included in the same radio communication subsystem and demodulates it into an audio signal;
a plurality of second receiving and demodulating units for receiving radio signals from respective radio relay devices included in a plurality of radio communication subsystems different from the same radio communication subsystem and demodulating them into audio signals ;
wherein the predetermined first radio frequencies different from each other in each of the radio communication subsystems are in the same radio frequency band, and the predetermined second radio frequencies different from each other in each of the radio communication devices are in the same radio frequency band; Communications system. The radio repeater included in the same radio communication subsystem,
the same number as the number of radio communication devices included in the same radio communication subsystem, for receiving a radio signal from each radio communication device included in the same radio communication subsystem and demodulating it into an audio signal; a reception demodulator;
a first adder that adds the audio signals from each of the third reception demodulators and outputs an added audio signal;
each radio communication device included in the same radio communication subsystem and the same radio communication subsystem generating a radio signal by modulating a radio carrier according to the audio signal after addition from the first adder; a second modulation transmitter that transmits to each wireless communication device included in a wireless communication subsystem separate from the
Each radio relay device included in the another radio communication subsystem,
the number of wireless communication devices included in the separate wireless communication subsystem that receive wireless signals from wireless communication devices included in the wireless communication subsystem including the wireless repeaters and demodulate them into voice signals; the same number of fourth receiving demodulators;
a second adder that adds the audio signals from each of the fourth receiving and demodulating units and outputs an added audio signal;
Each wireless communication device included in the separate wireless communication subsystem and the same wireless communication subsystem, generating a wireless signal by modulating a wireless carrier wave according to the voice signal after addition from the second adder. 5. The wireless communication system of claim 4, comprising a third modulation transmitter for transmitting to each wireless communication device included in the. A radio communication device for a radio communication system according to claim 4 or 5,
A wireless communication device, wherein the wireless communication device is each wireless communication device included in the same wireless communication subsystem or each wireless communication device included in the different wireless communication subsystem.

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