Intercom system and method for controlling intercom system

The present invention relates to an intercom system including a main control device, a master unit, and a slave unit, and a control method for the intercom system.

Intercom systems are used in large premises such as large stores, entertainment facilities, factories, etc., as a means of communication between a plurality of members, for example, between a manager and an employee (see Patent Document 1). An intercom system generally includes one or more master units, one or more slave units connected to the master unit, and a main controller that controls the master unit. In the intercom system, in general, the main controller synthesizes the voices transmitted by multiple members and sends them to the slave units owned by each member so that the voices transmitted by multiple members can be heard from each other. It is designed to do.

In recent intercom systems, the master unit and the slave unit are always connected for immediate communication, and the digital intercom system that enables bidirectional communication between the master unit and the slave unit has become the mainstream. .. In the digital intercom system, since the master unit and the slave unit are always connected, the number of slave units that can be connected to one master unit is limited.

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 11-355202</text></patcit><patcit num="2"><text>Japanese Patent Application Laid-Open No. 2005-197955</text></patcit></p>

<p> As described above, in the digital intercom system, although the number of slave units that can be connected to one master unit is limited, there is a desire to further increase the number of slave units. As one method for responding to such a request, there is a method of adding a slave unit for reception that basically only receives the voice information transmitted from the main control device. This method is described in, for example, Patent Document 2.</p><p> However, in the digital intercom system, when the main control device transmits the synthesized voice of the transmitted voice by a plurality of members to each slave unit via the master unit, the slave unit that is the transmission destination transmits from the synthesized voice. It is designed to be transmitted after deducting the voice. Therefore, there is a specific slave unit that is bidirectionally connected to the master unit, and the slave unit for reception that communicates in one direction is connected to the master unit to receive the voice received by the specific slave unit. Even if it is received by the handset of, the handset for receiving cannot hear the sound transmitted by a specific handset. As described above, even if a slave unit for reception is simply added to the conventional digital intercom system, there is a problem that the voice transmitted by the slave unit that communicates bidirectionally with the master unit cannot be heard.</p><p> In view of these problems, the present invention allows a receiving slave unit that communicates with the master unit in one direction to listen to a synthetic voice including a transmitted voice transmitted by the slave unit that communicates bidirectionally with the master unit. It is an object of the present invention to provide an intercom system capable and a control method of the intercom system.</p>

<p> In order to solve the above-mentioned problems of the prior art, the present invention is connected to the main control device (1), one or more master units (2) connected to the main control device, and the master unit. The main control device includes one or a plurality of slave units (3), and the main control device synthesizes the transmitted voice transmitted by each of the slave units to generate a first synthetic voice, and from the first synthetic voice. A voice synthesizer (15) that generates a second synthetic voice obtained by subtracting the transmitted voice from each transmission destination slave unit, and the second synthetic voice are transmitted to each of the slave units via the master unit. The slave unit has a transmitting unit (11) for transmitting, and the slave unit loops the receiving unit (39) for receiving the second synthetic voice and the transmitted voice transmitted by the slave unit to perform the second It is transmitted to the side sound processing unit (33) that performs side sound processing to be added to the synthetic voice of the above, the normal operation mode that communicates bidirectionally with the master unit, and a specific slave unit that communicates bidirectionally with the master unit. It has a switching unit (32) for switching between the command receiving mode connected to the master unit in order to receive the voice, and the slave unit is set to the command receiving mode by the switching unit to the master unit. When connected as a command receiving slave unit, the voice synthesis unit generates the first synthetic voice for the specific slave unit without subtracting the transmitted voice from the specific slave unit. The transmitting unit transmits the first synthetic voice to the specific slave unit, the receiving unit receives the first synthetic voice, and the side sound processing unit invalidates the side sound processing. To provide an intercom system characterized by the above.</p><p> In the above intercom system, when the slave unit is set to the receiving mode by the switching unit and tries to connect to the master unit and is the first receiving slave unit to be connected to the master unit, the first The command slave unit can be set as the command master slave unit which is the specific slave unit.</p><p> In the above intercom system, when the slave unit is set to the command receiving mode by the switching unit and tries to connect to the master unit, and the command master slave unit is connected to the master unit, the slave unit Can be set as a command slave slave unit for receiving the voice transmitted to the command master slave unit.</p><p> Further, in order to solve the above-mentioned problems of the prior art, the present invention connects the main control device (1), one or more master units (2) connected to the main control device, and the master unit. It is a control method of an intercom system including one or a plurality of slave units (3), and when the slave unit is set to a normal operation mode for bidirectional communication with the master unit, the main control device. Synthesizes the transmitted voices transmitted by each of the slave units to generate the first synthesized voice, and subtracts the transmitted voices from the respective transmission destination slave units from the first synthetic voice. The second synthetic voice is generated, the second synthetic voice is transmitted to each of the slave units via the master unit, and the slave unit set to the normal operation mode transmits the second synthetic voice. A specific child that receives, loops the transmitted voice transmitted by the slave unit, adds it to the second synthetic voice, performs side sound processing, and causes the slave unit to bidirectionally communicate with the master unit. When set to the command mode to connect to the master unit to receive the voice transmitted to the unit, the main control device may, for the specific slave unit, from the specific slave unit. The first synthetic voice is generated without subtracting the transmitted voice, the first synthetic voice is transmitted to the specific slave unit, and the slave unit set to the receiving mode is the first slave unit. Provided is a control method of an intercom system, which comprises receiving the synthetic voice of 1 and disabling the side sound processing.</p><p> In the above intercom system control method, when the slave unit is set to the command receiving mode and tries to connect to the master unit and is the first receiver slave unit to be connected to the master unit, the first The command receiving slave unit can be set as the command receiving master slave unit which is the specific slave unit.</p><p> In the above intercom system control method, when the slave unit is set to the command receiving mode and tries to connect to the master unit, and the command master slave unit is connected to the master unit, the slave unit is connected. , It can be set as a command slave slave unit for receiving the voice transmitted to the command master slave unit.</p>

<p> According to the intercom system of the present invention and the control method of the intercom system, a receiving child that unidirectionally communicates with the master unit a synthetic voice including a transmitted voice transmitted by the slave unit that communicates bidirectionally with the master unit. It will be possible to listen on the machine.</p>

<figref num="1">It is a block diagram which shows the whole structure example of one Embodiment of the intercom system of this invention.</figref><figref num="2">It is a block diagram for demonstrating operation when the intercom system of one Embodiment is a normal operation mode.</figref><figref num="3">It is a block diagram which shows the specific configuration example of the main control device 1 in FIG. 1 and FIG.</figref><figref num="4">It is a block diagram which shows the specific configuration example of the master unit 2 in FIG. 1 and FIG.</figref><figref num="5">It is a block diagram which shows the specific configuration example of the slave unit 3 in FIG. 1 and FIG.</figref><figref num="6">It is a flowchart which shows the connection process which is executed in the whole intercom system of one Embodiment.</figref><figref num="7">It is a flowchart which shows the transmission process by the command receiving master slave unit in the intercom system of one Embodiment.</figref><figref num="8">It is a flowchart which shows the transmission processing by the command receiving slave slave unit in the intercom system of one Embodiment.</figref>

Hereinafter, an embodiment of the intercom system and the control method of the intercom system of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the intercom system of one embodiment and the normal operation of the intercom system will be described with reference to FIG. The intercom system shown in FIG. 2 includes a main control device 1, a master unit 2a, 2b, 2c, and a slave unit 3a1,3a2,3a3,3b, 3c. The master units 2a to 2c are connected to the main control device 1 by wire. The slave unit 3a1,3a2,3a3 is wirelessly connected to the master unit 2a, the slave unit 3b is wirelessly connected to the master unit 2b, and the slave unit 3c is wirelessly connected to the master unit 2c. ..

The case where it is not specified which of the master units 2a to 2c is used is referred to as the master unit 2. When it is not specified which of the slave units 3a1, 3a2, 3a3, 3b, and 3c is used, or any slave unit (not shown) is referred to as the slave unit 3. Here, three master units 2 are connected to the main control device 1, but more master units may be connected, or only one master unit 2 may be connected. The number of master units 2 is arbitrary.

The intercom system of this embodiment is a digital intercom system, and the master unit 2 and the slave unit 3 are always connected. Since the master unit 2 allocates slots for transmitting and receiving in a time-division manner to the connected slave unit 3, the number of slave units 3 that can be connected to one master unit 2 is limited. The maximum number of slave units 3 that can be connected to one master unit 2 is, for example, three.

The main control device 1 is installed at a predetermined location inside or outside the premises, and the master unit 2 is attached to, for example, a wall or ceiling in the premises. The slave unit 3 is owned by each member who uses the intercom system.

Let the voices transmitted by the slave units 3a1, 3a2, 3a3, 3b, and 3c be Va1, Va2, Va3, Vb, and Vc, respectively. Since the member who owns the slave unit 3 does not always transmit, at least one of the transmitted voices Va1, Va2, Va3, Vb, and Vc may be silent. The transmitted voices Va1, Va2, Va3, Vb, and Vc are transmitted to the main controller 1 via the respective master units 2. The main controller 1 synthesizes all the transmitted voices Va1, Va2, Va3, Vb, and Vc input via the master unit 2.

When the main control device 1 transmits the synthesized voice to each slave unit 3 via the master unit 2, the main control device 1 subtracts the transmitted voice from the slave unit 3 which is the transmission destination from the synthetic voice, and subtracts the voice transmitted from the slave unit 3 to each slave unit 3. Send to. Specifically, the main controller 1 transmits (Va1 + Va2 + Va3 + Vb + Vc) -Va1 obtained by subtracting the transmitted voice Va1 from the synthetic voice to the slave unit 3a1 and sends it to the slave unit 3a2. For this, the transmitted voice Va2 was subtracted from the synthetic voice (Va1 + Va2 + Va3 + Vb + Vc)-Va2 was transmitted, and for the slave unit 3a3, the transmitted voice Va3 was subtracted from the synthetic voice (Va1 + Va2 + Va3 + Vb + Vc). Va1 + Va2 + Va3 + Vb + Vc)-Send Va3.

In addition, the main controller 1 transmits (Va1 + Va2 + Va3 + Vb + Vc) -Vb, which is obtained by subtracting the transmitted voice Vb from the synthetic voice, to the slave unit 3b, and to the slave unit 3c. , Subtract the transmitted voice Vc from the synthetic voice (Va1 + Va2 + Va3 + Vb + Vc)-Send Vc.

Since the transmitted voice transmitted by oneself is not transmitted from the main controller 1 to the slave units 3a1,3a2,3a3,3b, 3c, the transmitted voice Va1, Va2, Va3, Vb, Vc transmitted by oneself is transmitted to the slave unit 3a1,3a2,3a3,3b, 3c. Each is internally looped and added to the voice obtained by subtracting the transmitted voice sent by oneself from the synthetic voice. As a result, each member having the handset 3 can hear each other's utterances, and can also hear their own utterances.

The main controller 1 transmits the voice obtained by subtracting the voice transmitted from the slave unit 3 which is the transmission destination to each slave unit 3, and each slave unit 3 loops and adds the voice transmitted by itself. As a result, it is possible to reduce the time lag in which the voice transmitted by oneself is heard with a delay. In addition, even if the radio wave used for transmission / reception between the master unit 2 and the slave unit 3 deteriorates, at least one's own voice can be heard. Loop processing and addition of one's own transmitted voice is called lateral sound processing.

Here, an example of the internal configuration of each of the main control device 1, the master unit 2, and the slave unit 3 will be described. The main controller 1 is configured as shown in FIG. In FIG. 3, the wired transmission / reception unit 11 receives the transmitted voice or command transmitted from the master unit 2 and transmits the voice or command to the master unit 2. The voice transmission / reception unit 12 receives the transmitted voice received by the wired transmission / reception unit 11 and inputs it to the voice synthesis unit 15, and transmits the synthetic voice output from the voice synthesis unit 15 to the wired transmission / reception unit 11. The command transmission / reception unit 13 receives the command received by the wired transmission / reception unit 11 and inputs it to the control unit 14, and transmits the command from the control unit 14 to the wired transmission / reception unit 11.

As will be described in detail later, the command is a command for switching between normal operation of the handset 3 and operation as a commander (receiver handset), and an intercom system such as authentication information of the handset 3 sends and receives. Includes various identification and control information necessary to do so. The normal operation mode is when the slave unit 3 is operated normally, and the command reception mode is when the slave unit 3 is operated as a command receiver.

The control unit 14 controls the voice synthesis unit 15 so as to make the operation of the voice synthesis unit 15 different according to the switching command. The control unit 14 manages whether each slave unit 3 is set to the normal operation mode or the command reception mode. In the normal operation mode, as described above, the voice synthesis unit 15 subtracts the voice transmitted from the destination slave unit 3 from the synthesized voice obtained by synthesizing the voices transmitted from all the slave units 3. Generate. For convenience, the voice obtained by subtracting the transmitted voice from the slave unit 3 which is the transmission destination from the synthetic voice is also referred to as a synthetic voice. The operation of the speech synthesizer 15 in the command receiving mode will be described later.

The master unit 2 is configured as shown in FIG. In FIG. 4, the wired transmission / reception unit 21 receives the transmitted voice or command transmitted from the main control device 1 and transmits the voice or command to the main control device 1. The voice transmission / reception unit 22 receives the synthetic voice received by the wired transmission / reception unit 21 and inputs it to the voice processing unit 25, and transmits the transmitted voice output from the voice processing unit 25 to the wired transmission / reception unit 21. The command transmission / reception unit 23 receives the command received by the wired transmission / reception unit 21 and inputs it to the control unit 24, and transmits the command from the control unit 24 to the wired transmission / reception unit 21.

The control unit 24 inputs a command to the command processing unit 26, and inputs the command processed by the command processing unit 26 to the command transmission / reception unit 23. The voice processing unit 25 processes the synthetic voice or the transmitted voice based on the command processed by the command processing unit 26. The voice processing unit 25 performs processing for transmitting the synthesized voice transmitted from the master unit 1 to the slave unit 3 as an RF signal, or transmits the transmitted voice transmitted from the slave unit 3 as an RF signal to the master unit 1. Perform processing for sending. The RF communication control unit 27 controls the transmission of the RF signal in the RF transmission unit 28 and the reception of the RF signal in the RF reception unit 29.

The slave unit 3 is configured as shown in FIG. In FIG. 5, the control unit 301 switches and controls whether the slave unit 3 is operated in the normal operation mode or the command reception mode by selection by the changeover switch 302. The voice processing unit 303 processes the transmitted voice input from the voice input unit 305, which is a microphone, and inputs it to the RF communication control unit 307, and outputs the synthetic voice input from the RF communication control unit 307 as a voice speaker. Process so that it is pronounced from part 306. Based on the control by the control unit 301, the command processing unit 304 generates a command for operating the slave unit 3 normally or as a commander and various other commands, and inputs the command to the RF communication control unit 307. , The command input from the RF communication control unit 307 is processed and input to the control unit 301.

The voice processing unit 303 switches whether to process the sidetone or not to process the transmitted voice input from the voice input unit 305 based on the command from the command processing unit 304. The voice processing unit 303 operates as a side sound processing unit. The RF communication control unit 307 controls the transmission of the RF signal in the RF transmission unit 308 and the reception of the RF signal in the RF reception unit 309. A transmission button 310 and a timer 311 are also connected to the control unit 301. The control unit 301 controls the voice input unit 305 so as to enable the voice input by the voice input unit 305 when the transmission button 310 is pressed.

In the intercom system in which the main control device 1, the master unit 2, and the slave unit 3 are configured as described above, the operation when the changeover switch 302 in the slave unit 3 is set to operate in the command receiving mode will be described. In FIG. 1, the slave units 3b and 3c connected to the master units 2b and 2c are operating in the normal operation mode, and the operations of the main controller 1, the master units 2b and 2c and the slave units 3b and 3c are shown in FIG. Is the same as. FIG. 1 shows an example in which the slave unit 3 connected to the master unit 2a is operating in the command receiving mode.

In the present embodiment, in the state of being set to the receiving mode, the slave unit 3 that is first connected to one master unit 2 is set as the receiving slave unit that communicates bidirectionally with the master unit 2, and the second and subsequent units are set. The slave unit 3 connected to is basically set as a receiver slave unit for reception that only receives. The command slave unit that first connects to the master unit 2 and communicates bidirectionally with the master unit 2 is referred to as the command master slave unit. The second and subsequent receiving receivers connected are referred to as receiving slave slaves. The command master slave unit is a specific slave unit that communicates with the master unit 2 in both directions.

In FIG. 1, the command master slave unit 3am is connected to the master unit 2a. The command master slave unit 3am can operate in the same manner as the slave units 3a1, 3a2, 3a3 in the normal operation mode described in FIG. In the example shown in FIG. 1, the command slave slave units 3as1 and 3as2 are connected to the master unit 2a. The number of receiving slave slave units can exceed the maximum number of slave units 3 that can be connected to one master unit 2.

Although it is expressed here as a reception slave slave unit for reception, it is basically a slave unit mainly for reception and may have a transmission function. The command slave slave unit is basically a slave unit that mainly receives, and is a slave unit that communicates in one direction added to the command master slave unit that communicates bidirectionally with the master unit. .. Although the frequency is low, the transmission may be performed using the transmission function of the receiving slave slave unit. The operation when transmitting by the command slave slave unit will be described later. Here, the command slave slave units 3as1 and 3as2 do not send.

The voices transmitted by the command master slave unit 3am and the slave units 3b and 3c are Vam, Vb and Vc, respectively. The transmitted voices Vam, Vb, and Vc are transmitted to the main controller 1 via the respective master units 2. The voice synthesis unit 15 of the main control device 1 synthesizes all the transmitted voices Vam, Vb, and Vc input via the master unit 2. The main controller 1 is a destination from the synthetic voice when transmitting the synthetic voice to the respective slave units 3 via the master unit 2 for the slave units 3b and 3c operating in the normal operation mode. The voice obtained by subtracting the voice transmitted from the slave unit 3 is transmitted to each slave unit 3.

Specifically, the main control device 1 generates (Vam + Vb + Vc) -Vb obtained by subtracting the transmitted voice Vb from the synthesized voice by the voice synthesizer 15 and transmits it to the slave unit 3b. For the slave unit 3c, the voice synthesis unit 15 generates (Vam + Vb + Vc) -Vc obtained by subtracting the transmitted voice Vc from the synthesized voice and transmits it. In the slave units 3b and 3c, since the transmitted voice transmitted by themselves is not transmitted from the main control device 1, the transmitted voices Vb and Vc transmitted by themselves are processed by the voice processing unit 303 as side sounds from the synthesized voice. The transmitted voice sent by oneself is added to the deducted voice.

On the other hand, if the main controller 1 performs the same operation as the slave units 3b and 3c operating in the normal operation mode for the command master slave unit 3am operating in the command reception mode, the command is received. The master slave unit 3am and the command slave slave units 3as1 and 3as2 cannot hear the transmitted voice of the command master slave 3am. Therefore, in the present embodiment, the main control device 1 executes the following processing on the command receiving master slave unit 3am.

The main control device 1 directly transmits (Vam + Vb + Vc), which is a synthesized voice obtained by synthesizing the transmitted voices Vam, Vb, and Vc by the voice synthesizer 15, to the command master slave unit 3am. That is, the voice synthesis unit 15 of the main control device 1 does not subtract the transmitted voice Vam of the command master slave 3am from the synthetic voice with respect to the command master slave 3am. Therefore, the synthetic voice (Vam + Vb + Vc) is transmitted to the command slave slave units 3as1 and 3as2. At this time, the command receiving master slave unit 3am stops the sidetone processing by the voice processing unit 303. The command slave slave units 3as1 and 3as2 are not transmitting in the first place, and the sidetone processing by the voice processing unit 303 is stopped.

Due to the operation of the main controller 1 on the command master slave 3am, the command master slave 3am and the command slave slaves 3as1 and 3as2 are owned by other members including the voice of the command master slave 3am. It becomes possible to listen to the transmission from the handset 3. In this case, the member who owns the command master slave unit 3am may feel a slight time lag compared to the case where the voice transmitted by himself / herself is processed by the sidetone and added, but this is practically a problem. It does not become. According to the present embodiment, the command receiving master slave unit 3am cannot hear its own transmitted voice, and the receiving slave slave units 3as1 and 3as2 can hear the transmitted voice of the receiving master slave unit 3am. It is possible to solve the problem of not being able to do it.

The operation of the intercom system of the present embodiment will be further described with reference to the flowcharts of FIGS. 6 to 8. FIG. 6 shows the connection processing of the main controller 1, the master unit 2, and the slave unit 3 as a whole when the slave unit 3 to be connected to the master unit 2 is set to the receiving mode by the changeover switch 302. There is. In FIG. 6, the master unit 2 determines whether or not the command slave unit (receiver master slave unit or command slave slave unit) is already connected when the slave unit 3 makes a connection request in step S1. judge. If it is not determined that the receiving slave unit is connected (NO), the slave unit 3 that requested the connection is the slave unit that first tried to connect to the master unit 2 in the receiving mode, and the master unit 2 In step S2, the slave unit 3 and the slave unit 3 execute the command reception master connection process for setting in the command reception master slave unit.

Specifically, the master unit 2 allocates radio frequencies and slots for transmission and reception to the slave unit 3 in response to a connection request from the slave unit 3. The master unit 2 gives the slave unit 3 a key for transmitting and receiving, and executes a connection session with the slave unit 3. This command master connection process is the same as the connection process when the slave unit 3 to be connected to the master unit 2 is set to the normal operation mode.

Next, in step S3, the main control device 1 receives the command without subtracting the voice transmitted from the command master slave unit from the synthetic voice as described above for the voice transmitted to the command master slave unit. Set to use synthetic voice including the voice transmitted from the master slave unit. In step S4, the command master slave unit sets the sidetone processing to invalid and ends the connection processing.

On the other hand, if it is determined in step S1 that the receiving slave unit is connected (YES), the master unit 2 and the slave unit 3 are ordered to be set as the receiving slave slave unit in step S5. Executes the slave connection process and ends the connection process. Specifically, the master unit 2 allocates the radio frequency and slot to be transmitted to the slave unit 3 in response to the connection request from the slave unit 3, and the slave unit 3 assigns the key for receiving the voice. give. A connection session is not executed with the slave unit 3 set as the command slave slave unit.

FIG. 7 shows the transmission processing in the receiving master slave unit. In FIG. 7, the receiving master slave unit determines in step S11 whether or not the transmission button 310 is pressed. If it is determined that the transmission button 310 has been pressed (YES), the receiving master slave unit executes the transmission process while maintaining the connection state with the master unit 2 in step S12, and ends. If it is not determined that the send button 310 has been pressed (NO), the process of step S11 is repeated.

The receiving slave slave unit is basically for receiving, but there is a possibility that it may be necessary to send a call in an emergency. Therefore, in the present embodiment, as shown in FIG. 8, the transmission processing by the command receiving slave slave unit is realized. In FIG. 8, the receiving slave slave unit determines in step S21 whether or not the transmission button 310 is pressed. If it is determined that the transmission button 310 has been pressed (YES), the receiving master slave unit executes the receiving slave disconnection process in step S22. This stops the reception of audio from the master unit 2.

In step S23, the command slave slave unit executes the connection process as a normal slave unit. The slave unit 3 transmits a connection request to the nearest master unit 2. Therefore, even if the command receiving slave slave unit is, for example, the command slave slave unit 3as1 in FIG. 1, the connection process is not always executed for the master unit 2a. Connection processing may be executed for the master units 2b and 2c. Upon receiving the connection request, the master unit 2 assigns the frequencies and slots, if available, to the receiving slave slave unit, gives a key, and executes the connection session. In step S24, the receiving slave slave unit determines whether or not the connection with the master unit 2 as a normal slave unit is successful.

If it is determined that the connection is successful (YES), the command slave slave unit connected to the master unit 2 as a normal slave unit executes the transmission process in step S25, and the transmission button 310 is pressed in step S26. Determine if it is pressed. If it is determined that the transmission button 310 is pressed (YES), the receiving slave slave unit returns the process to step S25 and repeats the determination in step S26. If it is not determined in step S26 that the transmission button 310 is pressed (NO), the receiving slave slave unit operates the timer 311 in step S27 to start counting for a predetermined time.

In step S28, the receiving slave slave unit determines whether or not the timer 311 count has expired. The count by the timer 311 is, for example, about several seconds. If it is not determined that the count of the timer 311 has expired (NO), the receiving slave slave unit determines whether or not the transmission button 310 is pressed in step S32. If it is determined that the message button 310 is pressed (YES), the receiving slave slave unit returns the process to step S25, and if it is not determined that the message button 310 is pressed (NO), The receiving slave slave unit returns the process to step S28.

If it is determined in step S28 that the timer 311 count has expired (YES), the command slave slave unit is disconnected from the master unit 2 as a normal slave unit in step S29. Is executed, the reconnection process as a receiver slave unit is executed, and the process proceeds to step S1 in FIG. As explained in FIG. 6, if the receiving slave unit is not already connected, it is newly connected to the master unit 2 as the receiving master slave unit, and if the receiving slave unit is already connected, it is used as the receiving slave slave unit again. It will be connected to the master unit 2.

On the other hand, if it is not determined in step S24 that the connection is successful (NO), the receiving slave slave unit determines whether or not the transmission button 310 is pressed in step S30. If it is determined that the message button 310 is pressed (YES), the receiving slave slave unit returns the process to step S23, and if it is not determined that the message button 310 is pressed (NO), In step S31, the command receiving slave slave unit executes the reconnection process for the master unit 2 as the command slave slave unit, and ends.

As described above, in the present embodiment, when the transmission button 310 is pressed on the command receiving slave slave unit, the one-way communication connection to the master unit 2 as the receiving slave slave unit is temporarily disconnected. Connect to the master unit 2 as a normal slave unit that communicates in both directions. Therefore, since the receiving slave slave unit shifts to the state of permitting the transmission by the voice input unit 35, it is possible to transmit.

Further, in the present embodiment, when the transmission is completed by releasing the pressing of the transmission button 310, the bidirectional communication connection to the master unit 2 is disconnected after a predetermined time counted by the timer 311 elapses, and the parent is disconnected. It is possible to return to the one-way communication connection, which is the connection as the command slave slave unit, to the machine 2. Therefore, it is possible to limit the time during which the master unit 2 is normally connected as a slave unit. Therefore, it is possible to send and speak when necessary, although it is basically a slave unit for reception without impairing the meaning of operating the slave unit 3 as the command receiving mode.

In the present embodiment, an example in which the slave unit connected to the master unit first is the command receiving master slave unit and the slave unit connected to the second and subsequent units is the receiving slave slave unit has been described, but a specific child is described in advance. You may set the machine to always be the command master slave unit. In this case, if the command receiving master slave unit is fixedly arranged in a place where the radio wave condition is good, good communication can be performed.

Further, in the present embodiment, it is decided to instruct the start of transmission by pressing the transmission button 310, but the transmission is started when the voice input unit 305 detects the voice input without using the transmission button 310. VOX (Voice Operated X) control may be performed to instruct. In this case, when the voice input is not detected for a predetermined time, it is an instruction to end the transmission. That is, it suffices if there is an arbitrary transmission instruction unit.

The present invention is not limited to the present embodiment described above, and various modifications can be made without departing from the gist of the present invention. As mentioned above, the receiving slave unit is not limited to the slave unit that does not have any transmission function, but can be connected regardless of the maximum number of slave units that can be connected to the master unit. , Basically, it is a slave unit that mainly receives.

1 Main controller 2,2a, 2b, 2c base unit 3,3a1,3a2,3a3,3b, 3c slave unit 3am reception master slave unit 3as1,3as2 Command slave slave unit 11 Wired transmitter / receiver (transmitter) 15 Speech synthesizer 303 Audio processing unit (sidetone processing unit) 309 RF receiver (receiver) 310 Send button (send indicator)