JP6771007B2 - Wireless communication device - Google Patents

Description

The present invention relates to a wireless communication device such as a specific low power wireless device, which can be grouped so as to prevent interference.

In large shopping centers, users of many stores use so-called "extra small" specific low power radios. Here, when the user of the existing store uses a plurality of specific low power radios (hereinafter referred to as own station group radios), the user of the new store has a plurality of specific low powers in order to improve work efficiency. It is assumed that a radio (hereinafter referred to as another station group radio) is purchased. Users of other station group radios that entered later do not know which channel of the specified low power radio (in this specification, the radio channel is referred to as a channel) to use, that is, they do not know the free channel. Instead, for the time being, it will be operated on the default initial channel (for example, channel 1) as purchased.

Japanese Unexamined Patent Publication No. 9-187068

However, since the own station group radio has already used the initial channel (channel 1), there is a problem that interference with other station group radios will occur.

For example, in Patent Document 1, in a wireless relay system in which a plurality of groups use one repeater, communication for each group is possible without requiring troublesome operations and complicated configurations of repeaters and slave units. The following wireless relay systems and the like have been proposed in order to provide the wireless relay system.

The wireless relay system according to this conventional example is configured to include a master unit which is a wireless relay device and a plurality of slave units wirelessly connected to the master unit. The slave unit sends out a digital signal corresponding to the tone signal prior to the tone signal and the call signal for each transmission, and the tone signal of the relay control unit of the master unit is a digital signal extracted from the received signal by the digital signal extraction unit. It is configured to be set automatically based on, and the tone signal and the digital signal are set for each of a plurality of groups. This prevents interference with each other and allows a plurality of groups to use one repeater.

However, in the wireless relay system according to the conventional example, it is necessary to arrange a wireless relay device which is a master unit, and there is a problem that the system configuration becomes complicated.

An object of the present invention is to solve the above problems, and in a wireless communication device provided in a wireless communication system including a plurality of wireless communication devices, wireless communication capable of preventing interference between a plurality of groups that do not perform wireless communication. To provide the equipment.

The wireless communication device according to the first invention includes a own station wireless communication device that belongs to the own station group and has a first tone signal to be transmitted and received on the first wireless channel, and another station different from the own station group. A wireless communication device that is the own station wireless communication device in a wireless communication system including a wireless communication device that belongs to a group and has a second tone signal and is transmitted / received by the first wireless channel. ,
A control means for controlling the wireless communication device which is the own station wireless communication device is provided.
The control means
Wherein it is determined whether or not it has received another tone signal other than the first tone signal when it receives a radio signal in the first radio channel by the wireless communication device is a local station radio communication device uses,
When the other tone signal is received, the identifier of the other tone signal is detected,
After changing the tone signal identifier of the wireless communication device, which is the own station wireless communication device, from the first tone signal to the second tone signal based on the identifier of the other detected tone signal, the radio channel is changed. It is characterized in that a wireless signal including a prompting voice signal is transmitted to the other station wireless communication device via the first wireless channel .

In the wireless communication device, the control means transmits a wireless signal including a voice signal for prompting a change of the wireless channel to the other station wireless communication device on the first wireless channel, and then the own station wireless communication device. It is characterized in that the identifier of the tone signal of a certain wireless communication device is changed from the second tone signal to the first tone signal.

Further, in the wireless communication device, the control means is after detecting the identifier of the other tone signal when the other tone signal is received, and is based on the detected identifier of the other tone signal. Before changing the tone signal identifier of the wireless communication device, which is the own station wireless communication device, from the first tone signal to the second tone signal, a first free channel different from the first wireless channel is detected. And
The audio signal is characterized in that it is an audio signal for prompting a change to the first free channel.

Further, in the wireless communication device, the control means belongs to the own station group after transmitting a wireless signal including a voice signal for prompting a change of the wireless channel to the other station wireless communication device on the first wireless channel. The slave unit wireless communication device among the plurality of own station wireless communication devices having the first tone signal includes an audio signal for prompting the slave unit wireless communication device to change to a second free channel different from the first free channel. By transmitting the wireless signal on the first wireless channel, the channel used by the slave unit wireless communication device is changed to the second free channel.

Here, the control means, to the slave machine radio communication apparatus, the first radio signal the first including audio signals to notice a change to a different second idle channel is a vacant channel It is characterized in that the second free channel is detected before transmission on the wireless channel .

The wireless communication device according to the second invention is a slave unit wireless communication among a plurality of own station wireless communication devices that belong to the own station group and transmit and receive a wireless signal having a first tone signal on the first wireless channel. A wireless communication device that is a device
A wireless signal including an audio signal prompting a change to the second free channel from the master unit wireless communication device which is the wireless communication device is received by the first wireless channel, and the used channel is used as the second free channel. It is characterized by changing to a free channel.

Here, the wireless communication device is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal for transmitting and receiving each on the first wireless channel. A wireless communication device
A wireless signal including an audio signal for notifying in advance of a change to the second free channel from the master unit wireless communication device which is the wireless communication device according to claim 5 is received on the first wireless channel, and the audio is received. It is characterized in that the signal is demoted and output.

The wireless communication device according to the third invention is a wireless communication device that is a master unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal.
Another station wireless communication device that belongs to another station group and has a second tone signal, as opposed to a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal. It is characterized in that the channel used by the slave unit wireless communication device is changed to the free channel by transmitting a radio signal including an audio signal prompting the change to a free channel different from the channel used in.

Here, the wireless communication device notifies the slave unit wireless communication device of the change to the free channel in advance before transmitting the wireless signal including the voice signal prompting the change of the free channel to the slave unit wireless communication device. Sends radio signals including.

The wireless communication device according to the fourth invention is a wireless communication device that is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal.
The feature is that a radio signal including an audio signal prompting a change to the free channel is received from the master unit wireless communication device which is the wireless communication device according to claim 8 and the used channel is changed to the free channel. To do.

Here, in the wireless communication device, the wireless communication device which is a slave unit wireless communication device among a plurality of own station wireless communication devices belonging to the own station group and having the first tone signal.
The feature is that a wireless signal including an audio signal for notifying in advance of a change to the free channel is received from the master unit wireless communication device which is the wireless communication device according to claim 9, and the audio signal is demodulated and output. And.

Therefore, according to the wireless communication device according to the present invention, in a wireless communication device provided in a wireless communication system including a plurality of wireless communication devices, a plurality of wireless communication devices are simpler in configuration than the prior art and do not wirelessly communicate with each other. Interference can be prevented between groups of.

It is a block diagram which shows the structural example of the wireless communication apparatus 100 which concerns on Embodiment 1. FIG. It is a functional block diagram which shows the process of the "request call function" of the wireless communication device 100 of FIG. It is a flowchart which shows the 1st part of the communication control processing executed by the own station apparatus 100A in Embodiment 1. FIG. It is a flowchart which shows the 2nd part of the communication control processing executed by the own station apparatus 100A in Embodiment 1. FIG. It is a flowchart which shows the communication control processing executed by the other station apparatus 100B in Embodiment 1. FIG. It is a flowchart which shows the communication control processing executed by the own station master apparatus 100C using the "escape call function" of the wireless communication apparatus 100 which concerns on Embodiment 2. It is a flowchart which shows the communication control processing executed by the own-station handset apparatus 100D using the "escape call function" of the wireless communication apparatus 100 which concerns on Embodiment 2.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In each of the following embodiments, the same reference numerals are given to the same components.

Embodiment 1.
FIG. 1 is a block diagram showing a configuration example of the wireless communication device 100 according to the first embodiment. Further, FIG. 2 is a functional block diagram showing the processing of the “request call function” of the wireless communication device 100 of FIG.

In order to solve the problem in the prior art, in the first embodiment, the user of the other station group radio is requested to change the tone signal number in the "tone squelch", and the setting is changed to the own station group radio and others. We propose a "request call function" to prevent interference with station group radios. Here, the own station group radio that belongs to the own station group and has the first tone signal (No. 25 in the first embodiment) is set as the own station device 100A, and belongs to the own station group and has the second tone signal (implementation). In the first embodiment, the other station group radio having No. 47) is referred to as the other station device 100B, and each device is composed of the wireless communication device 100 of FIG.

In FIG. 1, the wireless communication device 100 includes an antenna 1, a transmission / reception switch 2, a reception demodulation unit 3, a speaker 4, a tone signal detection unit 5, a microphone 6, and a voice generation unit 7 having a voice data memory of 7 m. A signal adder 8, a modulation transmission unit 9, a control unit 10 having a control data memory of 10 m, an operation unit 11, and a display unit 13 are provided.

Here, the control unit 10 controls the transmission and reception of the wireless communication device 100 by controlling each unit based on the control data in the control data memory 10 m. The control unit 10 is connected to an operation unit 11 having a PTT (Push To Talk) key 12 and a display unit 13 for displaying predetermined data. The user turns on the PTT key 12 at the time of transmission, while releasing it at the time of reception to turn it off.

The radio signal received by the antenna 1 is input to the reception demodulation unit 3 via the transmission / reception switch 2 controlled by the control unit 10. The reception demodulation unit 3 amplifies the input radio signal with low noise, converts it into, for example, a baseband signal, and demodulates the audio signal by a predetermined demodulation method. The transmission / reception switch 2 is switched to the contact a side by the control unit 10 at the time of reception, and is switched to the contact b side by the control unit 10 at the time of transmission. The demodulated voice signal is output to the speaker 4, the voice of the voice signal is output, and is output to the tone signal detection unit 5. The tone signal detection unit 5 detects the frequency of the tone signal (signal for “tone squelch” described later) in the voice signal, and notifies the control unit 10 of the tone signal number corresponding to the frequency. If there is no tone signal in the audio signal, the control unit 10 is notified to that effect.

The voice transmitted from the microphone 6 is output to the modulation transmission unit 9 via the signal adder 8. Further, in response to the control signal from the control unit 10, the voice generation unit 7 synthesizes and converts the voice data in the voice data memory 7 m corresponding to the control signal into a voice signal, and then modulates the voice data via the signal adder 8. Output to the transmitter 9. The modulation transmission unit 9 modulates the radio signal by a predetermined modulation method according to the input audio signal, and then outputs the modulated radio signal to the antenna 1 via the transmission / reception switch 2, so that the radio wave of the radio signal is transmitted to the antenna. It is emitted from 1.

In the "request call function", set "tone squelch" for the own station group radio. Here, "tone squelch" uses the same channel and identifies the same tone signal (generally identified by a number; in the analog tone squelch type, it is identified by the frequency of the tone signal in the audio signal, and in the digital tone squelch type, it is a digital code. When receiving radio waves from the same group for which the same tone signal is set, the received sound is heard, and the sound of radio waves for which the same tone signal is not set is not heard, and is transmitted. Occasionally, while adding a tone signal within the modulated signal, by identifying the tone signal when it is received, radio waves from groups other than the same group are filtered to make them silent.

Hereinafter, the "request call function" will be described with reference to FIG. In FIG. 2, the own station device 100A is used as the own station group radio, and the other station device 100B is used as the other station group radio. When a plurality of wireless communication devices 100 exist as own station group radios, it is preferable to set one of them to have a "request call function". Further, in FIG. 2, it is assumed that the respective devices 100A and 100B use the illustrated frequencies, channels, and tone signal numbers, respectively.

In FIG. 2, both the own station device 100A and the other station device 100B are in the receiving state and perform carrier sense (S100). Next, when the radio signal of the other station device 100B enters the own station device 100A (S101), the own station device 100A detects and determines the tone signal number of the radio signal (S102). As a result, when the tone signal number of the received radio signal does not match the tone signal of the own station group radio (or when the tone squelch of the other station group radio is off), the tone signal of the own station group radio is transmitted. After temporarily changing to the tone signal of another station group radio (S103), prompting to change the channel to a specific channel "Channel 1 is currently in use. Excuse me, but please use channel 9." Is automatically transmitted to the other station device 100B (S104), and the other station device 100B outputs the voice guidance from the speaker (S105). On the other hand, the user of the other station device 100B changes the channel of the own station.

In other words, if another station group radio unknowingly enters the channel used by your own station group radio, you will be asked to automatically move out (change channel), and as a result, you will be able to use your own station group radio. Interference with other station group radios can be prevented.

In step S104, the voice guidance prompting the channel change to a specific channel is output, but the present invention is not limited to this, and the current channel is changed to another channel without specifying the changed channel. It may be voice guidance prompting the change of.

Next, the communication control process of the wireless communication device 100 will be described below. It should be noted that the channel, frequency, and tone signal number are examples, and different ones are set differently.

3A and 3B are flowcharts showing the communication control process executed by the own station device 100A in the first embodiment.

In step S1 of FIG. 3A, reception of a radio signal is awaited on channel 1 of the 422 MHz band and tone signal No. 25 (tone frequency: 156.7 Hz). Next, in step S2, it is determined whether or not the radio signal has been received on channel 1 in the 422 MHz band. If YES, the process proceeds to step S3, and if NO, the process proceeds to step S1. In step S3, it is determined whether or not the radio signal of tone signal No. 25 has been received. If YES, the process proceeds to step S4, and if NO, the process proceeds to step S5. In step S4, the normal reception state is set, and the process returns to step S1. In step S5, the frequency of the tone signal of the other station device 100B is detected from the received radio signal to identify the tone signal number (here, the tone signal number is 47). Next, in step S6, it is determined whether or not the tone signal number of the identified other station device 100B is normal unlike the set value of the own station device 100A. If YES, the process proceeds to step S7 of FIG. 3B, while NO. In the case of, the process returns to step S5.

In step S7 of FIG. 3B, an empty channel is detected, and in step S8, it is determined whether or not the empty channel is normal unlike the set value of the own station device 100A. If YES, the process proceeds to step S9, while NO Then, the process returns to step S7. In step S9, the tone signal number for the other station device 100B is set to 47, and in step S10, the voice information (currently set channel and free channel X) for the other station device 100B is set and the control data is set. Store in memory 10m. Next, in step S11, carrier sense is performed on channel 1 in the 422 MHz band, and if there is no carrier, a radio signal including "voice guidance" prompting the channel change is automatically transmitted. Here, the transmission content includes the carrier, tone signal No. 47, and voice guidance. Further, in step S12, after transmission, the initially set tone signal number is set to be returned to 25 and stored in the control data memory 10 m, and the process is completed.

FIG. 4 is a flowchart showing a communication control process executed by the other station device 100B in the first embodiment.

In step S21 of FIG. 4, PTT12 is turned on, carrier sense is performed on channel 1 of the 422 MHz band, and if there is no carrier, the audio signal of channel 1 of the 422 MHz band and tone signal No. 47 (tone signal frequency: 199. A radio signal modulated according to 5 Hz) is transmitted. Next, it is determined in step 22 whether or not the PTT key 12 has been turned off. If YES, the process proceeds to step S23, and if NO, the process returns to step S21. In step S23, the transmission of the radio signal of channel 1 in the 422 NHz band and the tone signal No. 47 is stopped. Next, in step S24, it is determined whether or not the radio signal has been received on channel 1 in the 422 NHz band. If YES, the process proceeds to step S25, and if NO, the process returns to step S24. Further, in step S25, the voice guidance is output from the speaker 4. Here, the voice guidance is, for example, "Channel 1 is currently in use. Excuse me, but please change to channel 9". In response to this, the user of the other station device 100B will perform an operation to change the wireless channel to be used.

As described above, according to the present embodiment, since the "request call function" is provided, when another station group radio unknowingly enters the channel used by the own station group radio, it is automatically provided. It asks you to move out (change channel), which can prevent interference between your own station group radio and other station group radio.

In the above-described first embodiment, it is assumed that the tone signal number is different between the own station device 100A and the other station device 100B, but the present invention is not limited to this, and the tone signal number is the same. It can be applied even when the tone squelch of the other station device 100B is off, and in this case, processing such as changing the tone signal number becomes unnecessary.

In the above first embodiment, the vacant channel is detected and determined in steps S7 and S8, but the present invention is not limited to this, and the vacant channel is not set in the audio information of step S10, and simply a channel. When requesting a change, the processes of steps S7 and S8 may be omitted.

Embodiment 2.
The wireless communication device 100 of the second embodiment has the same configuration as the configuration of the first embodiment (FIG. 1), but the communication control process is changed to FIGS. 5 and 6. The wireless communication device 100 of the second embodiment is characterized by having an "escape call function" instead of the "request call function". The wireless communication system according to the second embodiment includes a self-station master device 100C among a plurality of self-station group radios and at least one (s) self-station slave device 100D wirelessly connected to the self-station master device 100C. Is configured with. Here, the own station master unit device 100C and the own station slave unit device 100D belong to the own station group.

If interference continues even though the communication control process of the "request call function" according to the first embodiment is attempted, the own station master unit device 100C causes the own station slave unit device 100D to automatically change the channel. It is characterized by. Specifically, the voice guidance such as "Channel 1 is interfering, so it is automatically changed to channel 9" is transmitted from the own station master unit device 100C. After that, the channel code (change destination channel information, which is the channel identifier) is continuously transmitted to the own station slave unit device 100D. The own station slave unit device 100D detects and determines based on the received information, and automatically changes the channel. If this "escape call function" spreads within the wireless network, the wireless channel will be automatically reorganized, and both existing stores and new stores will be able to communicate comfortably without interfering with each other. Is possible.

FIG. 5 is a flowchart showing a communication control process executed by the own station master device 100C using the “escape call function” of the wireless communication device 100 according to the second embodiment. Note that, in FIGS. 5 and 6, the frequency, channel, and tone signal number are examples, and different ones are set differently.

In step S31 of FIG. 5, the communication control process (FIGS. 3A and 3B) of the own station device 100A has been executed, an empty channel different from channels 1 and 9 is detected, and channel 1 and tone signal 25 in the 422 MHz band are detected. It waits for the reception of the radio signal at the number (tone signal frequency: 156.7 Hz). Next, in step S32, voice information (currently set channel and different free channel) is set and stored in the control data memory 10 m. In step S33, carrier sense is performed on channel 1 of the 422 MHz band, and if there is no carrier, a radio signal including "voice guidance" for notifying the channel change in advance is automatically transmitted. Here, the transmission content includes, for example, a carrier, tone signal No. 25, and voice guidance. Next, in step S34, the modulation of the tone signal is turned off while holding the transmission carrier after outputting the voice guidance. In step S35, a radio signal including a channel code indicating the changed channel (for example, using an empty data slot reserved by a predetermined digital modulation, for example, a channel code of a different channel 9) is transmitted. Further, in step S36, the transmission is stopped, the setting is changed to the 422 MHz band channel 12, the control data memory is stored in the control data memory 10 m, and the tone signal modulation is turned back on.

FIG. 6 is a flowchart showing a communication control process executed by the own station slave unit device 100D using the “escape call function” of the wireless communication device 100 according to the second embodiment.

In step S41 of FIG. 6, the reception of the radio signal is awaited by the channel 1 of the 422 MHz band and the tone signal No. 25 (tone signal frequency: 156.7 Hz). Next, in step S42, it is determined whether or not the radio signal has been received in channel 1 of the 422 MHz band. If YES, the process proceeds to step S43, and if NO, the process returns to step S42. In step S43, the tone squelch is turned off after the voice guidance is output from the speaker 4. Here, the voice guidance is, for example, "Channel 1 is interfering. Therefore, it is automatically changed to channel 12.". Then, in step S44, it is determined whether or not the tone squelch determination is turned off. If YES, the process proceeds to step S45, and if NO, the process returns to step S44. In step S45, a channel code indicating the changed channel is detected, and in step S46, it is determined whether or not the channel indicated by the detected channel code is different from the current set value and is normal. If YES, step S47 On the other hand, if NO, the process returns to step S46. Further, in step S47, after determining the channel code, the setting is changed to the channel 12 in the 422 MHz band, the channel code is stored in the control data memory 10 m, and the process is completed.

As described above, according to the present embodiment, when the interference continues even though the communication control process of the "request call function" according to the first embodiment is attempted, the own station master unit device 100C is the own station slave unit. Since the device 100D is equipped with an "escape call function" that automatically changes channels, the wireless channels are automatically reorganized, and both existing stores and new stores in the conventional example interfere with each other (interference). Comfortable communication is possible without any problems.

In the above second embodiment, after executing the "request call function" of the first embodiment, the "escape call function" according to the second embodiment is executed, but the present disclosure is not limited to this, and the "request call function" is executed. May be executed without executing the "escape call function" according to the second embodiment.

In the above second embodiment, the voice guidance of the advance notice is output in step S43, but the present invention is not limited to this, and the channel may be automatically changed without the voice guidance of the advance notice. Further, the channel code indicating the changed channel may not be transmitted, and only the voice guidance of advance notification may be output.

The tone signals used in the first and second embodiments may be an analog tone squelch type or a digital code squelch type, as shown in the example of Table 1 below. Here, the identifier, which is a parameter for identifying the tone signal, includes a frequency, a tone signal number, a code, a code number, and the like.

As described in detail above, according to the wireless communication device according to the present invention, the wireless communication device provided in the wireless communication system including a plurality of wireless communication devices has a simpler configuration than the prior art. Interference can be prevented between a plurality of groups that do not communicate wirelessly with each other.

1 Antenna 2 Transmission / reception switch 3 Reception / demodulation unit 4 Speaker 5 Tone signal detection unit 6 Microphone 7 Voice generation unit 7m Audio data memory 8 Signal adder 9 Modulation transmission unit 10 Control unit 10m Control data memory 11 Operation unit 12 PTT key 13 Display 100,100A-100D wireless communication device

Claims (11)

It has a own station wireless communication device that belongs to its own station group and has a first tone signal and transmits / receives a radio signal on the first radio channel, and has a second tone signal belonging to another station group different from its own station group. A wireless communication device that is the own station wireless communication device in a wireless communication system including a wireless communication device of another station that transmits and receives a wireless signal on the first wireless channel .
A control means for controlling the wireless communication device which is the own station wireless communication device is provided.
The control means
Wherein it is determined whether or not it has received another tone signal other than the first tone signal when it receives a radio signal in the first radio channel by the wireless communication device is a local station radio communication device uses,
When the other tone signal is received, the identifier of the other tone signal is detected,
After changing the tone signal identifier of the wireless communication device, which is the own station wireless communication device, from the first tone signal to the second tone signal based on the identifier of the other detected tone signal, the radio channel is changed. A wireless communication device, characterized in that a wireless signal including a prompting voice signal is transmitted to the other station wireless communication device via the first wireless channel . The control means transmits a radio signal including a voice signal prompting the change of the radio channel to the other station wireless communication device via the first wireless channel, and then the tone of the wireless communication device which is the own station wireless communication device. The wireless communication device according to claim 1, wherein the identifier of the signal is changed from the second tone signal to the first tone signal. The control means is the own station wireless communication device after detecting the identifier of the other tone signal when the other tone signal is received, and based on the detected identifier of the other tone signal. Before changing the tone signal identifier of the wireless communication device from the first tone signal to the second tone signal, a first free channel different from the first wireless channel is detected.
The wireless communication device according to claim 1 or 2, wherein the audio signal is an audio signal for prompting a change to the first free channel. The control means has a first tone signal belonging to its own station group after transmitting a radio signal including a voice signal prompting a change of the radio channel to the other station wireless communication device on the first radio channel. respect handset wireless communication device of the plurality of own station wireless communication apparatus, the first of the first wireless radio signals comprising voice signals prompting a change to a different second idle channel is a vacant channel The wireless communication device according to claim 3, wherein the channel used by the handset wireless communication device is changed to the second free channel by transmitting on a channel . The control means transmits a wireless signal including an audio signal for notifying the slave unit wireless communication device of a change to a second free channel different from the first free channel in advance on the first wireless channel. The wireless communication device according to claim 4, wherein the second free channel is detected before transmission. A wireless communication device that is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal for transmission and reception on the first wireless channel .
A wireless signal including an audio signal prompting a change to the second free channel from the master unit wireless communication device which is the wireless communication device according to claim 4 is received by the first wireless channel, and the used channel is used. A wireless communication device characterized by changing to the second free channel. A wireless communication device that is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal for transmission and reception on the first wireless channel .
A wireless signal including an audio signal for notifying in advance of a change to the second free channel from the master unit wireless communication device, which is the wireless communication device according to claim 5, is received by the first wireless channel, and the audio is received. A wireless communication device characterized by demodulating and outputting a signal. A wireless communication device that is a master unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal.
Another station wireless communication device that belongs to another station group and has a second tone signal, as opposed to a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal. A wireless communication device characterized in that the channel used by the handset wireless communication device is changed to the free channel by transmitting a radio signal including an audio signal prompting the change to a free channel different from the channel used in. .. Before transmitting the radio signal including the voice signal prompting the change to the free channel to the slave unit wireless communication device, the radio signal including the voice signal notifying the change to the free channel in advance is transmitted. 8. The wireless communication device according to claim 8. A wireless communication device that is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal.
It is characterized in that it receives a wireless signal including an audio signal prompting to change to the free channel from the master unit wireless communication device which is the wireless communication device according to claim 8, and changes the used channel to the free channel. Wireless communication device. A wireless communication device that is a slave unit wireless communication device among a plurality of own station wireless communication devices that belong to the own station group and have a first tone signal.
It is characterized in that it receives a wireless signal including an audio signal for notifying in advance of a change to the free channel from the master unit wireless communication device which is the wireless communication device according to claim 9, demodulates the audio signal, and outputs the signal. Wireless communication device.

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