JP6181892B1 - Wireless communication apparatus and wireless communication system - Google Patents

Abstract

A wireless communication device capable of making at least four-party simultaneous communication and a wireless communication system using the same, which can eliminate a parent device. A simultaneous call wireless communication system including an even number of wireless communication devices of four or more, each wireless communication device receiving a wireless signal and demodulating it into a voice signal, and the demodulated The sound mixing means for mixing the sound signal to be transmitted by the local station and outputting the sound signal after mixing, and transmitting the radio signal modulated by modulating according to the sound signal after mixing Transmitting means. A pair of wireless communication devices of the four or more even number of wireless communication devices are sequentially arranged so that the four or more even number of wireless communication devices form a loop circuit of one audio signal. Any one of the four or more even number of wireless communication apparatuses connected via a wireless communication line includes howling prevention means for preventing howling in the loop circuit of the audio signal. [Selection] Figure 3

Description

  The present invention relates to a wireless communication device that performs simultaneous calls with other wireless communication devices, and a wireless communication system that includes a plurality of wireless communication devices that perform simultaneous calls.

  Aiming at the convenience of wireless device manufacturers and users, such as ensuring appropriate quality and compatibility of radio equipment, together with national technical standards for the purpose of effective use of frequencies and avoidance of interference with other users Therefore, “Specified low power radio station radio equipment radio equipment standard” is defined in Non-Patent Document 1. This specific low-power radio station is widely used nationwide because it does not require a radio station license.

  On page 2 of Non-Patent Document 1, it can be classified into “basic type” and “area expansion type” as the operation mode of the standard system, and “opposite type” and “centralized base type” are disclosed as the “basic type”. . Also, on pages 4 to 9 of Non-Patent Document 1, the frequency band, antenna power, number of channels, and frequency used are defined using the “broadcast communication method” or “duplex communication method” communication method for simultaneous communication. ing.

  Hereinafter, a configuration example of a wireless communication system according to a conventional example in which simultaneous calls are performed will be described. In the following conventional examples and examples, an example will be described based on the use frequency and channel defined in Non-Patent Document 1. In the drawing, for example, 454 MHz band CHA represents 454 MHz band channel A, and so on.

  FIG. 1 is a block diagram showing a configuration example of a wireless communication system according to Conventional Example 1. The wireless communication system of FIG. 1 includes a parent device 110 that is a relay device and three child devices 101 to 103, for example. Here, the subunit | mobile_units 101-103 are provided with the 1 mW radio | wireless transmission part which has a mutually different transmission frequency, and the radio | wireless receiving part which has the mutually same receiving frequency. On the other hand, base unit 110 has a radio transmission unit having the same transmission frequency as the reception frequency of the radio reception units of slave units 101 to 103, and a reception frequency that is the same as the transmission frequency of the radio transmission unit of each of slave units 101 to 103. And an adder 111 that adds and mixes the audio signals from the three wireless receivers and outputs the result to the wireless transmitter. By configuring as described above, a simultaneous communication radio communication system is configured.

  FIG. 2 is a block diagram showing a configuration example of a wireless communication system according to the second conventional example. The wireless communication system of FIG. 2 includes a parent device 210 that is a relay device and, for example, three child devices 201 to 203. Here, the subunit | mobile_unit 201-203 is provided with the 10 mW radio | wireless transmission part and radio | wireless receiving part which have the transmission / reception frequency of a mutually different pair channel. On the other hand, base unit 210 has relay device 211 that performs simultaneous call communication with handset 201, relay device 212 that performs simultaneous call communication with handset 202, relay device 213 that performs simultaneous call communication with handset 203, and relay. The adder 214 adds and mixes the audio signals from the respective radio reception units of the devices 211 to 213 and outputs them to the distributor 215, and the audio signal from the adder 214 is transmitted to the 10 mW radio transmission units of the relay devices 211 to 213. And a distributor 215 for outputting to distribute. By configuring as described above, a simultaneous communication radio communication system is configured.

  Incidentally, wireless communication systems having the basic configuration of Conventional Example 1 are disclosed in Patent Documents 1 to 3 below.

  In Patent Document 1, an audio signal obtained by adding the output signals of a plurality of reception demodulation means is added to and added to the output signal of the reception demodulation means of another wireless repeater, whereby the wireless repeater is completed as a product. There has been disclosed a wireless repeater that can theoretically increase the number of wireless communication devices that can be simultaneously talked to infinitely. The radio repeater includes a plurality of reception demodulation means for receiving radio waves and demodulating an audio signal, an external input terminal for inputting an audio signal, and each demodulation output by the plurality of reception demodulation means A mixer for adding a signal and an audio signal input from the external input terminal, a modulation transmission means for modulating the audio signal and transmitting it as a radio wave, and a switch for operating or stopping the modulation transmission means And an external output terminal for outputting the audio signal added by the mixer to the outside.

  Further, in Patent Document 2, a radio repeater is manufactured as a product by modulating and transmitting an audio signal obtained by adding the output signals of a plurality of reception demodulation means as a reception frequency of one reception demodulation means inside another radio repeater. There has been disclosed a wireless repeater that can theoretically increase the number of wireless communication devices that can simultaneously talk even after completion. The wireless repeater includes a plurality of reception demodulation means for receiving radio waves and demodulating an audio signal, a mixer for adding the respective demodulation signals output by the plurality of reception demodulation means, and an audio signal. Modulation transmission means for modulating and transmitting as a radio wave, and one reception frequency shared by a plurality of wireless communication devices as the first transmission frequency of the modulation transmission means, and in one other wireless repeater other than its own station A frequency setting means capable of setting a reception frequency of one reception demodulation means as a second transmission frequency of the modulation transmission means, and a switch capable of selecting the first and second transmission frequencies. .

  Furthermore, in Patent Document 3, all wireless devices can receive the contents of simultaneous calls between parent and child or between child devices via a parent device having a relay function, and other child devices are used for calling even during simultaneous calls. An inexpensive multi-radio simultaneous call system capable of emitting a radio wave is disclosed. In the multi-radio simultaneous call system, at least two repeaters 1 each uniquely assigned with a reception channel frequency and a transmission channel frequency are mutually connected by a relay cable as a parent device that relays the contents of simultaneous calls to a child device. Connected and controlled by the control unit, the microphone input signal from the microphone amplifier, the received signal from the slave unit received by the receiver, the input signal via the relay cable from other repeaters, and among these signals From any one of the mixed signals obtained by mixing the signals selected by the first selector with the mixer, the second selector selects the signals from the transmitter as a call signal for all the slave units, In addition, it is selected by the third selector and transmitted to another repeater via a relay cable.

By the way, on page 13 of Non-Patent Document 1, “career sense” is defined as follows (former notification of the Ministry of Posts and Telecommunications, No. 49 of 1989). Hereinafter, it is referred to as “career sense rules”.
“(3) Carrier Sense Radio equipment shall be equipped with carrier sense. Carrier sense is the same as the radio wave emitted by another radio station when it receives radio waves from other radio stations prior to setting up the radio communication line. It shall not emit radio waves of the frequency (the transmission frequency corresponding to the reception frequency in the case of the duplex system and the half-duplex system.) For the antenna power of 1 mW or less, the communication system is duplex. The carrier sense can be performed at the transmission frequency of the local station even in the system and the half-duplex system, except that radio waves having frequencies of 413.7 MHz to 414.1375 MHz and 454.05 MHz to 454.19375 MHz are used. It is assumed that no carrier sense is required, and the determination of the free state is induced in an antenna having an absolute gain of 2.14 dB. The voltage is 7 μV or less, the determination time is 200 ms or more, and the response time is within 20 ms. ”

JP 2009-010900 A JP 2009-1000043 A JP 2007-096579 A

Radio Industry Association, “Specified Low Power Radio Station Radio Equipment Standards”, RCR-STD-20 4.1 Edition, revised on November 30, 2005 Japan Radio Industry Association, “Radio equipment for land mobile service (for work communication) with aerial power of 1 mW or less”, RCR STD-31 version 3.1, revised on November 30, 2005

  In the wireless communication system according to the above-described conventional example 1, it is not necessary to perform carrier sense by applying the proviso of the carrier sense rules. However, in other words, according to the carrier sense, the transmission antenna power is regulated to 1 mW or less, and there is a problem that the transmission power is very small and the propagation distance is very short. In addition, as described above, the wireless communication system capable of simultaneous communication disclosed in Patent Documents 1 to 3 has the same basic configuration as that of Conventional Example 1, and has the same problems as in Conventional Example 1.

  Further, in the wireless communication system according to the second conventional example, if the slave units 201 to 203 and the relay apparatuses 211 to 213 are configured to have a carrier sense function, a simultaneous communication wireless communication system that satisfies the carrier sense rule is provided. Can be configured. However, since the relay apparatuses 211 to 213 transmit three radio waves simultaneously, it is necessary to arrange the three relay apparatuses 211 to 213 apart from each other by a predetermined distance or more in order to avoid radio wave interference. Therefore, there is a problem that it is difficult to integrate the base unit 210 in a small size.

  An object of the present invention is to provide a wireless communication apparatus capable of making at least 4-party simultaneous communication and a wireless communication system using the same, which can eliminate the need for a master unit.

A wireless communication system according to a first invention is
A simultaneous call radio communication system including at least four first to fourth radio communication devices,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal,
The first wireless communication device transmits a wireless signal to the second wireless communication device;
The second wireless communication device receives a wireless signal from the first wireless communication device, transmits a modulated wireless signal to the third wireless communication device,
The third wireless communication device receives a wireless signal from the second wireless communication device, and transmits a modulated wireless signal to the fourth wireless communication device;
The fourth wireless communication device receives a wireless signal from the third wireless communication device, transmits a modulated wireless signal to the first wireless communication device,
The first wireless communication device receives a wireless signal from the fourth wireless communication device, thereby forming a loop circuit of an audio signal by the first to fourth wireless communication devices,
Any one of the first to fourth wireless communication apparatuses includes a howling prevention means for preventing howling in the loop circuit of the audio signal.

A wireless communication system according to a second invention is
A simultaneous call radio communication system including at least six first to sixth radio communication devices,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal;
The first wireless communication device transmits a wireless signal to the second wireless communication device;
The second wireless communication device receives a wireless signal from the first wireless communication device, transmits a modulated wireless signal to the third wireless communication device,
The third wireless communication device receives a wireless signal from the second wireless communication device, and transmits a modulated wireless signal to the fourth wireless communication device;
The fourth wireless communication device receives a wireless signal from the third wireless communication device, transmits a modulated wireless signal to the fifth wireless communication device,
The fifth wireless communication device receives a wireless signal from the fourth wireless communication device, transmits a modulated wireless signal to the sixth wireless communication device,
The sixth wireless communication device receives a wireless signal from the fifth wireless communication device, and transmits a modulated wireless signal to the first wireless communication device;
The first wireless communication device receives a wireless signal from the sixth wireless communication device, thereby forming a loop circuit of an audio signal by the first to sixth wireless communication devices,
Any one of the first to sixth wireless communication apparatuses includes a howling prevention means for preventing howling in the loop circuit of the audio signal.

A wireless communication system according to a third invention is
A simultaneous call wireless communication system including an even number of wireless communication devices of four or more,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal;
A pair of wireless communication devices of the four or more even number of wireless communication devices are sequentially arranged so that the four or more even number of wireless communication devices form a loop circuit of one audio signal. Connect via wireless communication line,
Any one of the four or more even number of wireless communication apparatuses includes a howling prevention means for preventing howling in the loop circuit of the audio signal.

In the wireless communication system according to the first to third inventions,
Each of the radio communication devices is a radio equipment for a work communication radio station for land mobile work with an antenna power of 1 mW or less.

In the wireless communication system,
The transmitting means and the receiving means of each wireless communication device use wireless channels of different frequency bands, and the transmitting means of the even number of wireless communication devices are sequentially connected to each other along the loop circuit of the one audio signal. It is characterized by using radio channels of different frequency bands.

  A wireless communication device according to a fourth aspect is the wireless communication device for the wireless communication system.

A radio communication system according to a fifth invention is the radio communication system according to the first to third inventions,
At least one of the four or more even-numbered wireless communication devices constituting the wireless communication system receives a wireless signal on a wireless channel different from the wireless channel of the receiving unit of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
A wireless communication device different from the four or more even number of wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
By including another wireless communication device including a reception unit that receives a wireless signal from a transmission unit of the at least one wireless communication device and demodulates it into an audio signal,
Connecting the at least one wireless communication device and the other wireless communication device via a full-duplex wireless communication line;
As a result, simultaneous calls of at least five persons are performed.

In the wireless communication system according to the fifth aspect, the another wireless communication device is:
A wireless communication system different from the wireless communication systems according to the first to third inventions, wherein the wireless communication system has the same configuration as the wireless communication system according to claim 1 except for a wireless channel. It is characterized by being a wireless communication apparatus.

A radio communication system according to a sixth invention is the radio communication system according to the first to third inventions,
A plurality of wireless communication devices among four or more even number of wireless communication devices constituting the wireless communication system each receive a wireless signal on a wireless channel different from the wireless channel of the receiving means of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
The four or more even number of wireless communication devices are a plurality of different wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
A plurality of other wireless communication devices including a reception unit that receives a radio signal from a transmission unit of the at least one wireless communication device and demodulates the signal into an audio signal;
Connecting the plurality of wireless communication devices and the plurality of other wireless communication devices via full-duplex wireless communication lines, respectively.
As a result, simultaneous calls of at least six parties are performed.

In the wireless communication system according to the sixth invention, each of the plurality of other wireless communication devices is
A wireless communication system different from the wireless communication systems according to the first to third inventions, wherein the wireless communication system has the same configuration as the wireless communication system according to claim 1 except for a wireless channel. It is characterized by being a wireless communication apparatus.

A wireless communication apparatus according to a seventh invention is
It is said another radio | wireless communication apparatus for the radio | wireless communications system concerning 5th or 6th invention, It is characterized by the above-mentioned.

  Therefore, according to the wireless communication device and the wireless communication system using the wireless communication device according to the present invention, at least four-party simultaneous call can be realized with the same wireless communication device configuration without using a master unit.

It is a block diagram which shows the structural example of the radio | wireless communications system concerning the prior art example 1. FIG. It is a block diagram which shows the structural example of the radio | wireless communications system concerning the prior art example 2. FIG. 1 is a block diagram illustrating a configuration example of a wireless communication system according to a first embodiment. It is a block diagram which shows the structural example of the radio | wireless communication apparatus 10 of FIG. It is a block diagram which shows the structural example of the radio | wireless communications system concerning Embodiment 2. FIG. FIG. 9 is a block diagram illustrating a configuration example of a wireless communication system according to a third embodiment. It is a block diagram which shows the structural example of 10 A of radio | wireless communication apparatuses of FIG. FIG. 9 is a block diagram illustrating a configuration example of a wireless communication system according to a fourth embodiment. FIG. 10 is a block diagram illustrating a configuration example of a wireless communication system according to a fifth embodiment.

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same component.

Embodiment 1. FIG.
FIG. 3 is a block diagram illustrating a configuration example of the wireless communication system according to the first embodiment. In FIG. 3, the wireless communication system according to the first embodiment is configured to include four wireless communication devices 10-1 to 10-4 (generically, denoted by reference numeral 10). Note that channel numbers CH1 to CH4 in FIG. 3 are any different channel numbers selected from the channel numbers of work communication channels defined in Non-Patent Document 2, for example, and the same applies to the following drawings.

  In FIG. 3, each of the wireless communication devices 10-1 to 10-4 includes one modulation transmission unit 13, one reception demodulation unit 11, a variable amplifier 19, a speaker 16, and a microphone 14. In each of the wireless communication devices 10-1 to 10-4, the audio signal received and demodulated by each reception demodulator 11 is mixed with the audio signal from the microphone 14 via the variable amplifier 19, and then the modulation transmitter 13. Is input. The modulation transmission unit 13 modulates the radio signal according to the input mixed audio signal and transmits the modulated radio signal.

  Here, an operation example of channel use of each of the wireless communication devices 10-1 to 10-4 is as follows. The channel to be used is an example, and it is only necessary to form a sound signal loop circuit as described later.

(1) The modulation transmission unit 13 of the wireless communication device 10-1 transmits a wireless signal through the channel 1 in the 413 MHz band. However, the reception demodulation unit 11 of the wireless communication apparatus 10-1 waits for reception of a wireless signal through the channel 4 in the 454 MHz band.
(2) The reception demodulator 11 of the wireless communication device 10-2 receives the wireless signal from the wireless communication device 10-1 through the channel 413 of the 413 MHz band, thereby performing wireless communication between the wireless communication devices 10-1 and 10-2. After the line L1 is formed, the modulation transmission unit 13 of the wireless communication apparatus 10-2 transmits a wireless signal through the channel 2 in the 454 MHz band.
(3) The reception demodulation unit 11 of the wireless communication device 10-3 receives the wireless signal from the wireless communication device 10-2 through the channel 2 in the 454 MHz band, thereby performing wireless communication between the wireless communication devices 10-2 and 10-3. After the line L2 is formed, the modulation transmission unit 13 of the wireless communication apparatus 10-3 transmits a wireless signal through the channel 3 in the 413 MHz band.
(4) The reception demodulation unit 11 of the wireless communication device 10-4 receives the wireless signal from the wireless communication device 10-3 through the channel 3 of the 413 MHz band, thereby performing wireless communication between the wireless communication devices 10-3 and 10-4. After the line L3 is formed, the modulation transmission unit 13 of the wireless communication device 10-4 transmits a wireless signal through the channel 4 in the 454 MHz band.
(5) The wireless communication device 10-1 receives the wireless signal from the wireless communication device 10-4 through the channel 4 in the 454 MHz band, thereby forming the wireless communication line L4 between the wireless communication devices 10-4 and 10-1. The

  By the operations of the radio communication apparatuses 10-1 to 10-4, the four radio communication lines L1 to L4 are connected in a loop shape to form a loop circuit for one audio signal. As a result, one voice signal loop circuit is formed between the wireless communication devices 10-1 to 10-4, and four parties can talk simultaneously. The odd-numbered wireless communication lines L1 and L3 use the 413 MHz band wireless channel, while the even-numbered wireless communication lines L2 and L4 use the 454 MHz band wireless channel, so that transmission / reception within the same wireless communication device 10 is performed. The difference between the frequencies is separated as much as possible. That is, the modulation transmission unit 13 and the reception demodulation unit 11 of each radio communication device 10 use radio channels of different frequency bands, and each modulation transmission unit 13 of each radio communication device 10 has a loop of the one audio signal. Radio channels in different frequency bands are used sequentially along the circuit. In other words, each reception demodulator 11 of each radio communication device 10 uses radio channels of different frequency bands sequentially along the loop circuit of the one audio signal.

  The features of the wireless communication system according to the first embodiment configured as described above are as follows.

(1) Each of the wireless communication devices 10-1 to 10-4 is configured without a sub reception unit or circuit.
(2) In the wireless communication system, one voice signal loop circuit is formed so that four parties can talk simultaneously.
(3) In the wireless communication system, since a voice signal loop circuit is formed at the time of a four-party simultaneous call, there is a possibility that howling may occur. To prevent this, before the factory shipment or after the factory shipment, It is necessary to adjust the gain of the variable amplifier 19 of each of the wireless communication apparatuses 10-1 to 10-4 so that howling does not occur periodically at a predetermined period. Theoretically, this is known as an “oscillation condition including an amplitude condition and a phase condition”. As the amplitude condition, for example, a loop gain of a voice signal loop circuit is a predetermined value that is 0 or more and less than 1 (the minimum value is for calling) If it is adjusted so that the audio signal is recognized by the human ear), howling can be prevented.
(4) In the wireless communication system, since there is no transmission time limit (aerial transmission power: 1 mW) in order to use the work communication channel specified in Non-Patent Document 2, each carrier sense is not required. There is no restriction on the access timing of the wireless communication devices 10-1 to 10-4.
(5) When at least four-party simultaneous calls are possible and expanded, by adding a wireless communication device 10 having the same configuration as the wireless communication device 10 as described later in the second embodiment, for example, Simultaneous calls by even number of users such as 6, 8 and 10 are possible.
(6) In the conventional example, the radio communication system is configured in the relationship between the master station and the slave station. However, in the radio communication system, a radio communication system limited to the slave stations that does not require the master station can be configured.
(7) It is impossible to configure a wireless communication system with an odd number of users such as five, seven, and nine because of the combination of frequencies.

  Hereinafter, a detailed configuration and detailed operation of the wireless communication device 10 will be described.

  FIG. 4 is a block diagram illustrating a configuration example of the wireless communication device 10 of FIG. In FIG. 4, the wireless communication device 10 includes a reception antenna 11A, a reception demodulation unit 11, a modulation transmission unit 13, a transmission antenna 13A, a control unit 15, a speaker 16, and a PTT (Push To Talk) key 18. And an operation unit 17 having the same.

  In FIG. 4, the reception demodulator 11 receives the radio signal received by the receiving antenna 11A, demodulates the audio signal, and modulates the demodulated audio signal through, for example, the variable amplifier 19 whose gain is semi-fixed. The data is output to the transmission unit 13 and the speaker 16. The modulation transmitting unit 13 mixes each audio signal input from the variable amplifier 19 and the microphone 14 (the audio signal input from the microphone 14 is an audio signal to be transmitted by the own station), and according to the mixed audio signal After modulating the radio signal, the modulated radio signal is transmitted from the transmission antenna 13A. The speaker 16 converts an input audio signal into sound and outputs the sound. When the operator of the wireless communication apparatus 10 turns on the PTT key 18 of the operation unit 17, the control unit 15 turns on the operation of the modulation transmission unit 13. At this time, the modulation transmission unit 13 is input to the microphone 14. After modulating the radio signal according to the voice signal converted from the voice to be transmitted, the modulated radio signal is transmitted from the transmission antenna 13A. The control unit 15 controls the operation of the wireless communication device 10 by executing a predetermined communication control process. Here, the control unit 15 controls the reception frequency of the reception demodulation unit 11 and controls the transmission frequency of the modulation transmission unit 13.

  In the configuration example of FIG. 4, the reception antenna 11 </ b> A and the transmission antenna 13 </ b> A may be configured with one antenna device via a duplexer (not shown). Moreover, although the modulation | alteration transmission part 13 transmits by 1mW of antenna power in order to make it comply with the nonpatent literature 2, for example, this invention is not restricted to this, You may transmit less than 1mW or exceeding 1mW.

  As described above, according to the present embodiment, four wireless communication lines L1 to L4 are connected in a loop shape by the operations of the wireless communication devices 10-1 to 10-4, and one audio signal is transmitted. A loop circuit is formed. As a result, one voice signal loop circuit is formed between the wireless communication devices 10-1 to 10-4, and four parties can talk simultaneously. In the first embodiment, as described above, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of each of the wireless communication devices 10-1 to 10-4.

Embodiment 2. FIG.
FIG. 5 is a block diagram illustrating a configuration example of a wireless communication system according to the second embodiment. In FIG. 5, the second embodiment adds wireless communication apparatuses 10-5 and 10-6 having the same configuration as that of FIG. 4 as compared with the first embodiment of FIG. It is characterized by realizing 6-party simultaneous call by forming.

  In the second embodiment, an operation example of channel use of each of the wireless communication devices 10-1 to 10-6 is as follows. The channel to be used is an example, and it is only necessary to form a single audio signal loop circuit.

(1) The modulation transmission unit 13 of the wireless communication device 10-1 transmits a wireless signal through the channel 1 in the 413 MHz band. However, the reception demodulation unit 11 of the wireless communication apparatus 10-1 waits for reception of a wireless signal through the channel 6 in the 454 MHz band.
(2) The reception demodulator 11 of the wireless communication device 10-2 receives the wireless signal from the wireless communication device 10-1 through the channel 413 of the 413 MHz band, thereby performing wireless communication between the wireless communication devices 10-1 and 10-2. After the line L1 is formed, the modulation transmission unit 13 of the wireless communication apparatus 10-2 transmits a wireless signal through the channel 2 in the 454 MHz band.
(3) The reception demodulation unit 11 of the wireless communication device 10-3 receives the wireless signal from the wireless communication device 10-2 through the channel 2 in the 454 MHz band, thereby performing wireless communication between the wireless communication devices 10-2 and 10-3. After the line L2 is formed, the modulation transmission unit 13 of the wireless communication apparatus 10-3 transmits a wireless signal through the channel 3 in the 413 MHz band.
(4) The reception demodulation unit 11 of the wireless communication device 10-4 receives the wireless signal from the wireless communication device 10-3 through the channel 3 of the 413 MHz band, thereby performing wireless communication between the wireless communication devices 10-3 and 10-4. After the line L3 is formed, the modulation transmission unit 13 of the wireless communication device 10-4 transmits a wireless signal through the channel 4 in the 454 MHz band.
(5) The reception demodulator 11 of the wireless communication device 10-5 receives the wireless signal from the wireless communication device 10-4 via the channel 4 in the 454 MHz band, thereby performing wireless communication between the wireless communication devices 10-4 and 10-5. After the line L4 is formed, the modulation transmission unit 13 of the wireless communication device 10-5 transmits a wireless signal through the channel 5 in the 413 MHz band.

(6) The reception demodulator 11 of the wireless communication device 10-6 receives the wireless signal from the wireless communication device 10-5 through the channel 413 of the 413 MHz band, thereby performing wireless communication between the wireless communication devices 10-5 and 10-6. After the line L5 is formed, the modulation transmission unit 13 of the wireless communication device 10-6 transmits the wireless signal through the channel 6 in the 454 MHz band.
(7) The wireless communication device 10-1 receives the wireless signal from the wireless communication device 10-6 via the channel 454 in the 454 MHz band, thereby forming the wireless communication line L6 between the wireless communication devices 10-6 and 10-1. The

  As described above, according to the present embodiment, the six wireless communication lines L1 to L6 are connected in a loop shape by the operation of the wireless communication devices 10-1 to 10-6, and one voice signal is transmitted. A loop circuit is formed. As a result, one voice signal loop circuit is formed between the radio communication apparatuses 10-1 to 10-6, and six persons can talk simultaneously. In the second embodiment, as described above, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of each of the wireless communication apparatuses 10-1 to 10-6. Moreover, this embodiment is the same as that of Embodiment 1 also about another effect.

  In the first embodiment described above, a four-party simultaneous call is realized, and in the second embodiment, a six-party simultaneous call is realized. The communication system can be configured similarly. That is, each of a pair of four or more even number of wireless communication devices 10 is formed so that four or more even number of wireless communication devices 10 form a loop circuit of one voice signal. By sequentially connecting 10 through a one-way wireless communication line, simultaneous calls of four or more even parties can be realized.

Embodiment 3. FIG.
FIG. 6 is a block diagram illustrating a configuration example of a wireless communication system according to the third embodiment. In FIG. 6, the third embodiment differs from the first embodiment in FIG. 3 in the following points.
(1) During a four-party simultaneous call with the wireless communication devices 10A-1 to 10A-4, the wireless communication device 10A-5 interrupts to realize a five-party simultaneous call. Here, since carrier sense is not required, there is no limitation on the interrupt timing of the wireless communication device 10A-5. Radio communication apparatuses 10A-1 to 10A-5 are collectively referred to as 10A.
(2) The configuration of the radio communication device 10A is different from the radio communication device 10 in FIG. 4 in addition to the reception demodulator 11-1, the reception demodulator 11-2 that is a sub-reception unit, and the audio mixer 12 Is further provided.
Hereinafter, differences from the first embodiment will be described.

In FIG. 6, the configuration of each of the wireless communication devices 10A-1 to 10A-5 is as follows.
(1) Compared to the wireless communication device 10-1 in FIG. 3, the wireless communication device 10A-1 uses the reception demodulation unit 11 as a reception demodulation unit 11-1, and is a sub-reception means, for example, a channel 5 in the 454 MHz band. The reception demodulator 11-2 that receives the radio signal and the audio mixer 12 are provided.
(2) Compared to the wireless communication device 10-2 of FIG. 3, the wireless communication device 10A-2 uses the reception demodulation unit 11 as a reception demodulation unit 11-1, and is a sub-reception means, for example, a channel 413 in the 413 MHz band The reception demodulator 11-2 that receives the radio signal and the audio mixer 12 are provided.
(3) Compared with the wireless communication device 10-3 of FIG. 3, the wireless communication device 10A-3 uses the reception demodulation unit 11 as a reception demodulation unit 11-1, and is a sub-reception means, for example, a channel 454 in the 454 MHz band. The reception demodulator 11-2 that receives the radio signal and the audio mixer 12 are provided.
(4) Compared with the wireless communication device 10-4 of FIG. 3, the wireless communication device 10A-4 uses the reception demodulation unit 11 as a reception demodulation unit 11-1, and is a sub-reception means, for example, a channel 8 in the 413 MHz band. The reception demodulator 11-2 that receives the radio signal and the audio mixer 12 are provided.
(5) The radio communication device 10A-5 includes, for example, a modulation transmission unit 13 that transmits a radio signal using channel 8 in the 413 MHz band, a reception demodulation unit 11-1 that receives a radio signal using channel 4 in the 454 MHz band, For example, a reception demodulator 11-2 that receives a radio signal through a channel X in the 454 MHz band (referred to as a channel that is not used in the other radio communication device 10A), which is a reception unit. The radio communication device 10A-5 does not need to include the audio mixing unit 12 and the variable amplifier 19, but in order to have the same configuration as the other radio communication device 10A, the audio mixing unit 12 and the variable amplifier 19 are provided. The controller 15 may turn off the switches SW1 and SW2 in FIG.

  In the third embodiment, an operation example of channel use of each of the wireless communication devices 10A-1 to 10A-5 is as follows. The channel to be used is an example, and it is only necessary to form a full-duplex wireless communication line L5 in addition to the loop circuit of one audio signal by the wireless communication lines L1 to L4.

(1) First, the wireless communication devices 10A-1 to 10A-4 realize a four-party simultaneous call using the same wireless channel as that of FIG.
(2) The reception demodulator 11 of the radio communication device 10A-5 receives the radio signal from the radio communication device 10-4 on the channel 4 of the 454 MHz band, and the modulation transmitter 13 of the radio communication device 10A-5 receives the radio signal. A full-duplex wireless communication line L5 is formed between the wireless communication apparatuses 10A-4 and 10A-5 by transmitting on the channel 8 in the 413 MHz band. Thereby, the radio communication device 10A-5 can interrupt the loop circuit of the audio signal.

  As described above, in addition to the loop circuit for one voice signal by the wireless communication lines L1 to L4, the full-duplex wireless communication line L5 is formed, thereby realizing a five-party simultaneous call. In the third embodiment, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of each of the wireless communication devices 10A-1 to 10A-4.

  FIG. 7 is a block diagram illustrating a configuration example of the wireless communication device 10A of FIG. In FIG. 7, the wireless communication device 10A includes a reception antenna 11A, reception demodulation units 11-1 and 11-2, a modulation transmission unit 13, a transmission antenna 13A, switches SW1 and SW2, a voice mixing unit 12, A control unit 15, a speaker 16, and an operation unit 17 having a PTT (Push To Talk) key 18 are configured.

  In FIG. 7, the reception demodulator 11-1 receives the radio signal received by the reception antenna 11A, demodulates the audio signal, and outputs it to the audio mixer 12. The reception demodulator 11-2 is a sub-receiver. The radio signal received by the receiving antenna 11A is received, the audio signal is demodulated, and output to the audio mixing unit 12 via the switch SW1. The audio mixing unit 12 adds and mixes a plurality of input audio signals, and then outputs the added audio signal to the modulation transmission unit 13 and the speaker 16 via, for example, a variable amplifier 19 whose gain is semi-fixed. The modulation transmitting unit 13 mixes each audio signal input from the variable amplifier 19 and the microphone 14 (the audio signal input from the microphone 14 is an audio signal to be transmitted by the own station), and according to the mixed audio signal After modulating the radio signal, the modulated radio signal is transmitted from the transmission antenna 13A. The speaker 16 converts an input audio signal into sound and outputs the sound. When the operator of the radio communication device 10A turns on the PTT key 18 of the operation unit 17, the control unit 15 turns on the operation of the modulation transmission unit 13. At this time, the modulation transmission unit 13 is input to the microphone 14. After modulating the radio signal according to the audio signal mixed with the audio signal converted from the audio and the audio signal from the audio mixing unit 12, the modulated radio signal is transmitted from the transmission antenna 13A. The control unit 15 controls the operation of the wireless communication device 10A by executing a predetermined communication control process. Here, the control unit 15 controls the reception frequencies of the reception demodulation units 11-1 and 11-2 and controls the transmission frequency of the modulation transmission unit 13.

  In the configuration example of FIG. 7, the reception antenna 11 </ b> A and the transmission antenna 13 </ b> A may be configured by a single antenna device via a duplexer (not shown).

  The transmission channel of the modulation transmission unit 13 and the reception channels of the reception demodulation units 11-1 and 11-2 are preferably radio channels of different frequency bands, for example. Note that the reception channels of the reception demodulation units 11-1 and 11-2 are radio channels in the same frequency band, for example.

  As described above, according to the present embodiment, the wireless communication device 10A-5 receives the wireless signal of the transmission channel of the wireless communication device 10A-4 during the four-party simultaneous call as in the first embodiment, and By interrupting the reception channel of the reception demodulator 11-2, which is a sub-reception unit of the wireless communication device 10A-4, to transmit a wireless signal, a five-party simultaneous call can be realized.

  In the third embodiment, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of each of the wireless communication devices 10A-1 to 10A-4.

  In the wireless communication system of FIG. 6 described above, each wireless communication device 10A includes the reception demodulator 11-2 as a sub reception unit. In the example of FIG. 6, only the wireless communication device 10A-4 is a sub reception unit. However, the other radio communication apparatuses 10A-1 to 10A-3 and 10A-5 may not include the reception demodulation unit 11-2 as the sub reception unit. The same applies to the fourth embodiment described later.

Embodiment 4 FIG.
FIG. 8 is a block diagram illustrating a configuration example of a wireless communication system according to the fourth embodiment. In FIG. 8, the fourth embodiment differs from the first embodiment in FIG. 3 in the following points.
(1) An 8-party simultaneous call is realized by interrupting the wireless communication devices 10A-5 to 10A-8 during a 4-party simultaneous call with the wireless communication devices 10A-1 to 10A-4. Here, since carrier sense is not required, there is no restriction on the interrupt timing of the radio communication apparatuses 10A-5 to 10A-8. The wireless communication devices 10A-1 to 10A-8 are collectively referred to as 10A. The configuration of the wireless communication device 10A has the configuration shown in FIG.
Hereinafter, differences from the first and third embodiments will be described.

In FIG. 8, the configuration of each of the wireless communication devices 10A-1 to 10A-4 is the same as that of the third embodiment in FIG. The configuration of each of the wireless communication devices 10A-5 to 10A-8 is as follows.
(1) The radio communication device 10A-5 includes, for example, a modulation transmission unit 13 that transmits a radio signal through a channel 5 in the 454 MHz band, a reception demodulation unit 11-1 that receives a radio signal through the channel 1 in the 413 MHz band, For example, a reception demodulator 11-2 that receives a radio signal by using a channel X in a 413 MHz band (referred to as a channel that is not used in the other radio communication device 10A). The radio communication device 10A-5 does not need to include the audio mixing unit 12 and the variable amplifier 19, but in order to have the same configuration as the other radio communication device 10A, the audio mixing unit 12 and the variable amplifier 19 are provided. The controller 15 may turn off the switches SW1 and SW2 in FIG. This is the same in the wireless communication devices 10A-6 to 10A-8.
(2) The radio communication device 10A-6 includes, for example, a modulation transmission unit 13 that transmits a radio signal through a channel 6 in a 413 MHz band, a reception demodulation unit 11-1 that receives a radio signal through a channel 2 in a 454 MHz band, For example, a reception demodulator 11-2 that receives a radio signal through a channel X in the 454 MHz band (referred to as a channel that is not used in the other radio communication device 10A), which is a reception unit.
(3) The radio communication device 10A-7 includes, for example, a modulation transmission unit 13 that transmits a radio signal through a channel 7 in the 454 MHz band, a reception demodulation unit 11-1 that receives a radio signal through a channel 3 in the 413 MHz band, For example, a reception demodulator 11-2 that receives a radio signal by using a channel X in a 413 MHz band (referred to as a channel that is not used in the other radio communication device 10A).
(4) The radio communication device 10A-8 includes, for example, a modulation transmission unit 13 that transmits a radio signal through a channel 8 in the 413 MHz band, a reception demodulation unit 11-1 that receives a radio signal through the channel 4 in the 454 MHz band, For example, a reception demodulator 11-2 that receives a radio signal through a channel X in the 454 MHz band (referred to as a channel that is not used in the other radio communication device 10A), which is a reception unit.

(1) First, the wireless communication devices 10A-1 to 10A-4 realize a four-party simultaneous call using the same wireless channel as that of FIG.
(2) The reception demodulator 11 of the radio communication device 10A-5 receives the radio signal from the radio communication device 10-1 on the channel 1 of the 413 MHz band, and the modulation transmission unit 13 of the radio communication device 10A-5 receives the radio signal. A full-duplex wireless communication line L5 is formed between the wireless communication devices 10A-1 and 10A-5 by transmitting on the channel 5 in the 454 MHz band. Thereby, the radio communication device 10A-5 can interrupt the loop circuit of the audio signal.
(3) The reception demodulator 11 of the radio communication device 10A-6 receives the radio signal from the radio communication device 10-2 on the channel 2 of the 454 MHz band, and the modulation transmission unit 13 of the radio communication device 10A-6 receives the radio signal. By transmitting through the channel 6 in the 413 MHz band, a full-duplex wireless communication line L6 is formed between the wireless communication devices 10A-2 and 10A-6. As a result, the radio communication device 10A-6 can interrupt the audio signal loop circuit.
(4) The reception demodulator 11 of the radio communication device 10A-7 receives the radio signal from the radio communication device 10-3 on the channel 3 of the 413 MHz band, and the modulation transmitter 13 of the radio communication device 10A-7 receives the radio signal. A full-duplex wireless communication line L7 is formed between the wireless communication devices 10A-3 and 10A-7 by transmitting on the channel 7 in the 454 MHz band. As a result, the radio communication device 10A-7 can interrupt the audio signal loop circuit.
(5) The reception demodulator 11 of the radio communication device 10A-8 receives the radio signal from the radio communication device 10-4 on the channel 4 of the 454 MHz band, and the modulation transmitter 13 of the radio communication device 10A-8 receives the radio signal. By transmitting on channel 8 in the 413 MHz band, a full-duplex wireless communication line L8 is formed between the wireless communication devices 10A-4 and 10A-8. Thereby, the radio communication device 10A-8 can interrupt the loop circuit of the audio signal.

  The interrupt timings of the wireless communication devices 10A-5 to 10A-8 are arbitrary and may be performed randomly. Further, the number of the wireless communication devices 10A to be interrupted is 1 or more and 4 or less, and simultaneous conversation of 5 to 8 parties can be realized.

As described above, in addition to the loop circuit of one audio signal by the wireless communication lines L1 to L4, the full duplex wireless communication lines L5 to L8 are formed, so that up to eight persons can simultaneously be up to eight persons. A call can be realized. In the fourth embodiment, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of each of the wireless communication devices 10A-1 to 10A-4.
Embodiment 5. FIG.
FIG. 9 is a block diagram illustrating a configuration example of a wireless communication system according to the fifth embodiment. The fifth embodiment is a so-called diamond-shaped maximum of 20 simultaneous communication systems configured by expanding the 5-party simultaneous call wireless communication system according to the third embodiment and the 8-party simultaneous call wireless communication system according to the fourth embodiment. This is a call radio communication system.

In FIG. 9, A1 to A4, B1 to B4, C1 to C4, D1 to D4, and E1 to E4 are the wireless communication devices 10A of FIG. Here, the wireless communication system of FIG. 9 has the following groups.
(1) Group A: The wireless communication system of FIG. 3, wherein a loop circuit for one audio signal is formed by connecting four wireless communication devices A1 to A4 via wireless communication lines L1 to L4. A wireless communication system for simultaneous four-party calls is configured.
(2) A ′ group: the wireless communication system of FIG. 8, wherein one extended wireless communication device B1, C1, D1, E1 is assigned to each of the four wireless communication devices 10A of the A group. By connecting using the double wireless communication lines L5 to L8, a wireless communication system for a maximum of 8 simultaneous calls is configured. The number of wireless communication devices B1, C1, D1, and E1 to be expanded is not limited to four, and only one to three wireless communication devices 10A may be expanded and connected. The wireless communication lines L5 to L8 are full-duplex wireless communication lines.
(3) Group B: a wireless communication system corresponding to the wireless communication system of FIG. 3, and a loop of one audio signal by connecting four wireless communication apparatuses B1 to B4 via wireless communication lines L11 to L14. A circuit is formed to constitute a wireless communication system for simultaneous four-party calls. By connecting the B-group wireless communication system to the wireless communication apparatus A1 of the A-group wireless communication system via the full-duplex wireless communication line L5, an 8-party simultaneous communication wireless communication system is configured. The radio channels used in the radio communication lines L11 to L14 are preferably different from the radio communication lines L1 to L5, but the radio channels in the group B form the radio communication lines L11 to L14 with the radio communication devices B1 to B4. Is set as follows.
(3) Group C: a wireless communication system corresponding to the wireless communication system of FIG. 3, and a loop of one voice signal by connecting four wireless communication devices C1 to C4 through wireless communication lines L21 to L24. A circuit is formed to constitute a wireless communication system for simultaneous four-party calls. By connecting the wireless communication system of group C to the wireless communication device A2 of the wireless communication system of group A to which the wireless communication system of group B is connected via a full-duplex wireless communication line L6, A wireless communication system for calls is configured. The radio channels used in the radio communication lines L21 to L24 are preferably different from those of the radio communication lines L1 to L5 and L11 to L14. However, the radio channels in the C group are the radio communication devices C1 to C4 and the radio communication lines L21 to L21. L24 is set to form.
(4) Group D: a wireless communication system corresponding to the wireless communication system of FIG. 3, wherein four wireless communication devices D1 to D4 are connected to the wireless communication lines L31 to L31 via a full-duplex wireless communication line L7. By connecting at L34, a loop circuit for one voice signal is formed, and a wireless communication system for simultaneous four-party calls is configured. By connecting the D-group wireless communication system to the wireless communication apparatus A3 of the A-group wireless communication system to which the B-group and C-group wireless communication systems are connected, a 16-party simultaneous call wireless communication system is configured. The wireless channels used in the wireless communication lines L31 to L34 are preferably different from the wireless communication lines L1 to L5, L11 to L14, and L21 to L24, but the wireless channels in the D group are wirelessly connected to the wireless communication devices D1 to D4. Communication lines L31 to L34 are set to be formed.
(5) E group: a wireless communication system corresponding to the wireless communication system of FIG. 3, in which four wireless communication devices E1 to E4 are connected to the wireless communication lines L41 to L41 via a full-duplex wireless communication line L8. By connecting at L44, a loop circuit for one voice signal is formed, and a wireless communication system for simultaneous four-party calls is configured. By connecting the E-group radio communication system to the radio communication apparatus A4 of the A-group radio communication system to which the B-group, C-group and D-group radio communication systems are connected, Configure. The radio channels used in the radio communication lines L41 to L44 are preferably different from the radio communication lines L1 to L5, L11 to L14, L21 to L24, and L31 to L34, but the radio channel in the E group is the radio communication device E1. To E4, the wireless communication lines L41 to L44 are set.

  As described above, according to the present embodiment, the group B, group C, and group D radio communication systems are connected to the group A radio communication system via a full-duplex radio communication line. Thus, a radio communication system for simultaneous calls of up to 20 people can be realized. In the fifth embodiment, it is necessary to avoid howling by the audio signal loop circuit by adjusting the gain of the variable amplifier 19 of the radio communication device 10A in the loop circuit of each audio signal in each group.

  In the fifth embodiment described above, four wireless communication devices 10A are provided in one group. However, the present invention is not limited to this, and as shown in the second embodiment and its modifications, six in one group. You may comprise with the above even number of radio | wireless communication apparatuses 10A. For example, when six wireless communication devices 10A are configured for one group, when there is no limitation on the number of wireless channels, a total of 30 simultaneous wireless communication means can be realized.

Modified example.
In the above embodiment, the variable amplifier 19 is used as the howling prevention means. However, the present invention is not limited to this, and a variable attenuator may be used. Here, at least one variable amplifier 19 or variable attenuator may be inserted in each loop circuit of the audio signal. In the embodiment, the variable amplifier 19 is inserted in the subsequent stage of the audio mixing unit 12. However, the present invention is not limited to this, and the variable amplifier 19 may be inserted in both or one of the previous stages of the audio mixing unit 12. Good.

  In the above embodiment, the speaker 16 is used. However, the present invention is not limited to this, and an audio output device such as an earphone or a headphone may be used.

  In the above embodiment, the radio communication device 10 and the radio communication device 10A are radio equipment for a specific low power radio station radio telephone, and the modulation transmission unit 13 transmits a radio signal with an antenna power of 1 mW. The radio signal is not limited, and a radio signal less than 1 mW or more than 1 mW may be transmitted.

  As described above in detail, according to the wireless communication apparatus and the wireless communication system using the wireless communication apparatus according to the present invention, the parent device can be dispensed with. In addition, it is possible to provide a wireless communication apparatus capable of simultaneous communication with at least four parties and a wireless communication system using the same.

10, 10-1 to 10-6, 10A, 10A-1 to 10A-8... Wireless communication device,
11, 11-1, 11-2 ... reception demodulator,
11A: receiving antenna,
12 ... Audio mixing unit,
13 Modulation transmitter,
13A: Transmitting antenna,
14 ... Microphone,
15 ... control unit,
16 ... Speaker,
17 ... operation part,
18 ... PTT key,
19: Variable amplifier,
A1-A4, B1-B4, C1-C4, D1-D4, E1-E4 ... wireless communication device,
L1-L44 ... wireless communication line,
SW1, SW2 ... switch.

Claims (7)

A simultaneous call radio communication system including at least four first to fourth radio communication devices,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal,
The first wireless communication device transmits a wireless signal to the second wireless communication device;
The second wireless communication device receives a wireless signal from the first wireless communication device, transmits a modulated wireless signal to the third wireless communication device,
The third wireless communication device receives a wireless signal from the second wireless communication device, and transmits a modulated wireless signal to the fourth wireless communication device;
The fourth wireless communication device receives a wireless signal from the third wireless communication device, transmits a modulated wireless signal to the first wireless communication device,
The first wireless communication device receives a wireless signal from the fourth wireless communication device, thereby forming a loop circuit of an audio signal by the first to fourth wireless communication devices,
Any one of the first to fourth wireless communication devices includes howling prevention means for preventing howling in the loop circuit of the audio signal ,
The transmitting means and the receiving means of each wireless communication device use wireless channels of different frequency bands, and the transmitting means of the even number of wireless communication devices are sequentially connected to each other along the loop circuit of the one audio signal. Use radio channels in different frequency bands,
At least one of the four or more even-numbered wireless communication devices constituting the wireless communication system receives a wireless signal on a wireless channel different from the wireless channel of the receiving unit of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
A wireless communication device different from the four or more even number of wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
By including another wireless communication device including a reception unit that receives a wireless signal from a transmission unit of the at least one wireless communication device and demodulates it into an audio signal,
Connecting the at least one wireless communication device and the other wireless communication device via a full-duplex wireless communication line;
A wireless communication system characterized in that at least five or more simultaneous calls are made. A simultaneous call radio communication system including at least six first to sixth radio communication devices,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal;
The first wireless communication device transmits a wireless signal to the second wireless communication device;
The second wireless communication device receives a wireless signal from the first wireless communication device, transmits a modulated wireless signal to the third wireless communication device,
The third wireless communication device receives a wireless signal from the second wireless communication device, and transmits a modulated wireless signal to the fourth wireless communication device;
The fourth wireless communication device receives a wireless signal from the third wireless communication device, transmits a modulated wireless signal to the fifth wireless communication device,
The fifth wireless communication device receives a wireless signal from the fourth wireless communication device, transmits a modulated wireless signal to the sixth wireless communication device,
The sixth wireless communication device receives a wireless signal from the fifth wireless communication device, and transmits a modulated wireless signal to the first wireless communication device;
The first wireless communication device receives a wireless signal from the sixth wireless communication device, thereby forming a loop circuit of an audio signal by the first to sixth wireless communication devices,
Any one of the first to sixth wireless communication devices includes a howling prevention means for preventing howling in the loop circuit of the audio signal ,
The transmitting means and the receiving means of each wireless communication device use wireless channels of different frequency bands, and the transmitting means of the even number of wireless communication devices are sequentially connected to each other along the loop circuit of the one audio signal. Use radio channels in different frequency bands,
At least one of the four or more even-numbered wireless communication devices constituting the wireless communication system receives a wireless signal on a wireless channel different from the wireless channel of the receiving unit of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
A wireless communication device different from the four or more even number of wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
By including another wireless communication device including a reception unit that receives a wireless signal from a transmission unit of the at least one wireless communication device and demodulates it into an audio signal,
Connecting the at least one wireless communication device and the other wireless communication device via a full-duplex wireless communication line;
A wireless communication system characterized in that at least seven parties make simultaneous calls. A simultaneous call wireless communication system including an even number of wireless communication devices of four or more,
Each of the wireless communication devices
Receiving means for receiving a radio signal and demodulating it into an audio signal;
Audio mixing means for mixing the demodulated audio signal and an audio signal to be transmitted by the own station, and outputting an audio signal after mixing;
Transmitting means for transmitting a radio signal modulated by modulating according to the mixed audio signal,
A pair of wireless communication devices of the four or more even number of wireless communication devices are sequentially arranged so that the four or more even number of wireless communication devices form a loop circuit of one audio signal. Connect via wireless communication line,
Any one of the four or more even number of wireless communication devices includes a howling prevention means for preventing howling in the loop circuit of the audio signal ,
The transmitting means and the receiving means of each wireless communication device use wireless channels of different frequency bands, and the transmitting means of the even number of wireless communication devices are sequentially connected to each other along the loop circuit of the one audio signal. Use radio channels in different frequency bands,
At least one of the four or more even-numbered wireless communication devices constituting the wireless communication system receives a wireless signal on a wireless channel different from the wireless channel of the receiving unit of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
A wireless communication device different from the four or more even number of wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
By including another wireless communication device including a reception unit that receives a wireless signal from a transmission unit of the at least one wireless communication device and demodulates it into an audio signal,
Connecting the at least one wireless communication device and the other wireless communication device via a full-duplex wireless communication line;
A wireless communication system characterized in that at least five or more simultaneous calls are made.   The wireless communication system according to any one of claims 1 to 3, wherein each of the wireless communication devices is a wireless facility of a work communication wireless station for land mobile work with an antenna power of 1 mW or less. Before Symbol another wireless communication device,
The wireless communication system according to any one of claims 1-4 to a different radio communication system, radio communication system and a radio channel according to any one of claims 1-4 A wireless communication system that is a wireless communication apparatus in another wireless communication system having the same configuration except for the above. In the radio | wireless communications system as described in any one of Claims 1-4 ,
A plurality of wireless communication devices among four or more even number of wireless communication devices constituting the wireless communication system each receive a wireless signal on a wireless channel different from the wireless channel of the receiving means of the wireless communication device. Sub-reception means is further provided,
The wireless communication system includes:
The four or more even number of wireless communication devices are a plurality of different wireless communication devices,
Transmitting means for modulating in accordance with the audio signal to be transmitted by the own station, and transmitting the modulated radio signal to the sub-receiving means of the at least one radio communication device;
A plurality of other wireless communication devices including a reception unit that receives a radio signal from a transmission unit of the at least one wireless communication device and demodulates the signal into an audio signal;
Connecting the plurality of wireless communication devices and the plurality of other wireless communication devices via full-duplex wireless communication lines, respectively.
Thus, a wireless communication system characterized in that simultaneous calls of at least six parties are performed. The wireless communication system according to claim 6 , wherein
Each of the plurality of other wireless communication devices is
The wireless communication system according to any one of claims 1-4 to a different radio communication system, radio communication system and a radio channel according to any one of claims 1-4 A wireless communication system that is a wireless communication apparatus in another wireless communication system having the same configuration except for the above.

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