JP5849751B2 - Intercom system and control method of intercom system - Google Patents

Description

  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.

  An intercom system is used as a communication means between a plurality of members, for example, between an administrator and an employee in a wide premises such as a large store, an amusement facility, and a factory (see Patent Document 1). An intercom system generally includes one or more parent devices, one or more child devices connected to the parent device, and a main control device that controls the parent device. In the intercom system, in general, the main controller synthesizes the voices sent by multiple members and sends them to the slaves owned by each member so that the voices sent by multiple members can hear each other. It is supposed to be.

  In recent intercom systems, a main unit and a slave unit are always connected for immediate calling, and a digital intercom system that allows two-way communication between the master unit and the slave unit has become the mainstream. . In the digital intercom system, since the parent device and the child device are always connected, the number of child devices that can be connected to one parent device is limited.

Japanese Patent Laid-Open No. 11-355202 JP 2005-197955 A

  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 increase the number of slave units. As a technique for meeting such a demand, there is a technique of adding a receiving slave unit that only receives voice information transmitted from the main control device. This technique is described in Patent Document 2, for example.

  However, even in the case of a slave unit for reception, there is a possibility that it may be necessary to transmit a speech in an emergency case. Therefore, it is basically desired to enable transmission while being used for reception.

  In order to meet such a demand, the present invention can be added as a slave unit for reception regardless of the maximum number of slave units connected to the master unit, and can also transmit and receive an intercom system. And it aims at providing the control method of an intercom system.

  In order to solve the problems of the conventional technology described above, the present invention is connected to the main control device (1), one or more parent devices (2) connected to the main control device, and the parent device. One or a plurality of slave units (3), and the master unit receives a voice transmitted to a specific slave unit (3am) that communicates with the master unit in both directions. Receiving slaves (3as1, 3as2) communicating in the direction are connected, and the receiving slave unit includes a transmission instruction unit (310) for instructing transmission and a voice input unit (305) for transmission. And a timer (311) that counts a predetermined time, and when a transmission instruction is given by the transmission instruction unit, the one-way communication connection to the parent unit is canceled, and Connected as a normal handset that communicates in both directions, and transitioned to a state where transmission by the voice input unit is allowed When the transmission is ended by the end of the transmission instruction by the transmission instruction unit, after the predetermined time counted by the timer has elapsed, the two-way communication connection to the base unit is released, Provided is an intercom system characterized by returning to a one-way communication connection with a base unit.

In the above intercom system, the main control device, with respect to the specific slave unit, a first synthesized voice obtained by synthesizing a transmission voice transmitted by each of the slave units including the specific slave unit, Transmitting via the master unit, the specific slave unit invalidates the side tone processing that loops the transmission voice transmitted by the specific slave unit and adds it to the voice received from the main control unit, It is preferable that the reception slave unit receives the first synthesized voice received by the specific slave unit.

  In the above intercom system, the main control unit is configured to transmit the normal slave unit that is a transmission destination from the first synthesized voice to the normal slave unit other than the specific slave unit and the reception slave unit. The second synthesized voice obtained by subtracting the voice transmitted from the mobile station is transmitted via the master unit, and each of the normal slave units loops the transmitted voice transmitted by each of the normal slave units to perform the loop processing. It is preferable to perform sidetone processing to be added to the second synthesized speech received from the main control device.

In order to solve the above-described problems of the related art, the present invention is connected to the main control device (1), one or more parent devices (2) connected to the main control device, and the parent device. Control method of an intercom system comprising one or a plurality of slave units (3), and a voice transmitted to the master unit that is transmitted to a specific slave unit (3am) bidirectionally communicating with the master unit Receiving slave units (3as1, 3as2) that communicate in one direction from the master unit are connected, and the receiving slave unit is unidirectional to the master unit when an instruction to transmit is given. After releasing the communication connection, connected as Tsujoko machine to communicate bidirectionally with respect to the base unit, is shifted to a state that allows transmission talking, transmission is terminated by the completion of the transmission of the instruction, A predetermined time is counted by a timer, and after the predetermined time has elapsed, Disconnect the bidirectional communications, a control method for intercom system, characterized in that to return to connect one-way communication to the base unit.

In the control method for the intercom system, the main control device is configured to first synthesize a transmission voice transmitted by each of the slave units including the specific slave unit with respect to the specific slave unit. Voice is transmitted via the master unit, and the specific slave unit performs side processing for looping the transmission voice transmitted by the specific slave unit and adding it to the voice received from the main controller. Preferably, the reception slave unit receives the first synthesized speech received by the specific slave unit.

  In the control method of the intercom system, the main control device is the transmission destination from the first synthesized voice to the normal slave unit other than the specific slave unit and the reception slave unit. The second synthesized voice obtained by subtracting the transmission voice from the normal slave unit is transmitted via the master unit, and each of the normal slave units loops the transmission voice transmitted by each of the normal slave units. Then, it is preferable to perform side sound processing to be added to the second synthesized speech received from the main control device.

  According to the intercom system and the control method of the intercom system of the present invention, it can be added as a slave unit for reception regardless of the maximum number of slave units connected to the master unit, and it can also be used for transmission. Is also possible.

It is a block diagram which shows the example of whole structure of one Embodiment of the intercom system of this invention. It is a block diagram for demonstrating operation | movement in case the intercom system of one Embodiment is a normal operation mode. FIG. 3 is a block diagram illustrating a specific configuration example of a main control device 1 in FIGS. 1 and 2. FIG. 3 is a block diagram illustrating a specific configuration example of a base unit 2 in FIGS. 1 and 2. It is a block diagram which shows the specific structural example of the subunit | mobile_unit 3 in FIG.1 and FIG.2. It is a flowchart which shows the connection process performed in the whole intercom system of one Embodiment. It is a flowchart which shows the transmission process by the instruction | indication master subunit | mobile_unit in the intercom system of one Embodiment. It is a flowchart which shows the transmission process by the receiving slave subunit | mobile_unit in the intercom system of one Embodiment.

  Hereinafter, an embodiment of an intercom system and a 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 controller 1, master units 2a, 2b, and 2c, and slave units 3a1, 3a2, 3a3, 3b, and 3c. Master devices 2a to 2c are connected to main controller 1 by wire. Slave units 3a1, 3a2, 3a3 are connected to the master unit 2a by radio, slave units 3b are connected to the master unit 2b by radio, and slave units 3c are connected to the master unit 2c by radio. .

  A case where it is not specified which of the parent devices 2a to 2c is referred to as a parent device 2. The slave unit 3 a 1, 3 a 2, 3 a 3, 3 b, 3 c will be referred to as a slave unit 3 when it is not specified or any slave unit not shown. Here, the number of master units 2 connected to the main control device 1 is three, but more master units may be connected, or only one master unit 2 may be connected. The number of base units 2 is arbitrary.

  The intercom system of this embodiment is a digital intercom system, and the parent device 2 and the child device 3 are always connected. Since the base unit 2 assigns slots for transmitting and receiving in time division to the connected handset 3, the number of handset 3 that can be connected to one base unit 2 is limited. For example, the maximum number of slave units 3 that can be connected to one master unit 2 is 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 a ceiling inside the premises. Each handset 3 is owned by each member who uses the intercom system.

  The voices transmitted by the slave units 3a1, 3a2, 3a3, 3b, and 3c are Va1, Va2, Va3, Vb, and Vc, respectively. Since the member who owns the handset 3 does not always transmit, there is a case where at least one of the transmitted voices Va1, Va2, Va3, Vb and Vc is silent. The transmitted voices Va1, Va2, Va3, Vb, and Vc are transmitted to the main control device 1 through the respective parent devices 2. Main controller 1 synthesizes all transmitted voices Va1, Va2, Va3, Vb, and Vc input via base unit 2.

  When transmitting the synthesized voice to each slave unit 3 via the master unit 2, the main control device 1 obtains the voice obtained by subtracting the transmitted voice from the slave unit 3 as the transmission destination from the synthesized speech. Send to. Specifically, the main control device 1 transmits (Va1 + Va2 + Va3 + Vb + Vc) −Va1 obtained by subtracting the transmission voice Va1 from the synthesized voice to the slave unit 3a1, and transmits the synthesized voice to the slave unit 3a2. (Va1 + Va2 + Va3 + Vb + Vc) −Va2 is transmitted by subtracting the spoken voice Va2, and (Va1 + Va2 + Vb3 + Vb + Vc) −Va3 is transmitted to the slave unit 3a3 by subtracting the transmitted voice Va3 from the synthesized voice.

  Further, main controller 1 transmits (Va1 + Va2 + Va3 + Vb + Vc) −Vb obtained by subtracting transmission voice Vb from the synthesized voice to slave unit 3b, and transmitted voice Vc from the synthesized voice to slave unit 3c. (Va1 + Va2 + Va3 + Vb + Vc) −Vc is transmitted.

  Since the transmitted voice transmitted by itself is not transmitted from the main control device 1 to the slave units 3a1, 3a2, 3a3, 3b, 3c, the transmitted voices Va1, Va2, Va3, Vb, Vc transmitted by themselves are received. Each loops internally and is added to the voice obtained by subtracting the transmission voice transmitted by itself from the synthesized voice. Thereby, each member having the handset 3 can hear each other's transmission, and can also hear his own transmission.

  The main controller 1 transmits to each slave unit 3 a sound obtained by subtracting the transmission voice from the slave unit 3 that is the transmission destination, and loops and adds its own transmitted voice in each slave unit 3. As a result, it is possible to reduce the time lag in which the user's own transmitted voice is heard with a delay. Further, even when the radio wave used for transmission / reception between the parent device 2 and the child device 3 deteriorates, at least the user's own transmitted voice can be heard. The process of looping and adding one's own transmitted voice is called sidetone processing.

  Here, examples of internal configurations of the main control device 1, the parent device 2, and the child device 3 will be described. The main controller 1 is configured as shown in FIG. In FIG. 3, the wired transmission / reception unit 11 receives a transmitted voice or command transmitted from the parent device 2, and transmits the voice or command to the parent device 2. The voice transmission / reception unit 12 receives the transmission voice received by the wired transmission / reception unit 11 and inputs the voice to the voice synthesis unit 15, and transmits the synthesized 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, inputs the command 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 whether to operate the slave unit 3 normally or as a commander (commander slave unit), and an intercom system such as authentication information of the slave unit 3 to transmit / receive It contains various types of identification information and control information necessary for performing. The case where the child device 3 is normally operated is referred to as a normal operation mode, and the case where the child device 3 is operated as an instruction device is referred to as an acceptance mode.

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

  The base unit 2 is configured as shown in FIG. In FIG. 4, the wired transmission / reception unit 21 receives the transmitted voice and command transmitted from the main control device 1, and transmits the voice and command to the main control device 1. The voice transmission / reception unit 22 receives the synthesized voice received by the wired transmission / reception unit 21, 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, inputs the command 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 a command processed by the command processing unit 26 to the command transmission / reception unit 23. The voice processing unit 25 processes the synthesized 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 parent device 1 to the child device 3 as an RF signal, or transmits the transmission voice transmitted from the child device 3 as the RF signal to the parent device 1. Processing to send is performed. 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 subunit | mobile_unit 3 is comprised as shown in FIG. In FIG. 5, the control unit 301 performs switching control of whether the child device 3 is operated in the normal operation mode or the acceptance mode by selection by the changeover switch 302. The voice processing unit 303 processes the transmission voice input from the voice input unit 305 that is a microphone, inputs the processed voice to the RF communication control unit 307, and outputs the synthesized voice input from the RF communication control unit 307 as a voice output that is a speaker. Processing is performed so as to generate a sound from the unit 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 an instruction unit and other various commands and inputs them 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.

  Based on the command from the command processing unit 304, the voice processing unit 303 switches whether the transmitted voice input from the voice input unit 305 is side-side processed or not side-side processed. The sound 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 to validate the voice input by the voice input unit 305 when the send 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 acceptance 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. FIG. 1 shows an example in which the slave unit 3 connected to the master unit 2a is operating in the acceptance mode.

  In this embodiment, in the state where the command mode is set, the first slave unit 3 connected to one master unit 2 is set as the command slave unit that communicates with the master unit 2 in two directions. Basically, the slave unit 3 connected to is set as a reception command slave unit for receiving only. The command slave unit that is first connected to the master unit 2 and communicates bidirectionally with the master unit 2 is referred to as a command master slave unit. The receiving slave unit connected after the second will be referred to as a command slave slave unit. The instruction master slave unit is a specific slave unit that communicates with the master unit 2 in both directions.

  In FIG. 1, an instruction master slave unit 3am is connected to the master unit 2a. The instruction master slave unit 3am can perform the same operation 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 command slave slave units can be connected exceeding the maximum number of slave units 3 that can be connected to one master unit 2.

  Here, although it is expressed 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 data, and is a slave unit that communicates in one direction with respect to the command master slave unit that communicates with the master unit in both directions. . Although the frequency is low, the voice may be transmitted using the transmission function of the slave slave unit. The operation in the case of transmitting by the command slave slave unit will be described later. Here, the command slave slave units 3as1 and 3as2 do not transmit.

  The voices transmitted by the instruction 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 through the respective parent devices 2. The voice synthesizer 15 of the main controller 1 synthesizes all the transmitted voices Vam, Vb, Vc input via the master unit 2. When the main controller 1 transmits the synthesized voice to each of the slave units 3 via the master unit 2 with respect to the slave units 3b and 3c operating in the normal operation mode, the main control device 1 is the transmission destination from the synthesized speech. The voice obtained by subtracting the transmission voice from the handset 3 is transmitted to each handset 3.

  Specifically, the main controller 1 generates and transmits (Vam + Vb + Vc) −Vb obtained by subtracting the transmission voice Vb from the synthesized voice by the voice synthesizer 15 to the slave unit 3b, and transmits it to the slave unit 3c. On the other hand, the voice synthesizer 15 generates (Vam + Vb + Vc) −Vc obtained by subtracting the transmission voice Vc from the synthesized voice and transmits it. The slave units 3b and 3c do not transmit the transmission voice transmitted by themselves, from the main control device 1, and therefore, the voice processing unit 303 performs side sound processing on the transmission voices Vb and Vc transmitted by itself from the synthesized voice. Add to the subtracted voice sent by yourself.

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

  Main controller 1 directly transmits (Vam + Vb + Vc), which is a synthesized voice obtained by synthesizing transmission voices Vam, Vb, and Vc to voice master unit 3am. That is, the voice synthesis unit 15 of the main control device 1 does not subtract the transmission voice Vam of the command master slave unit 3am from the synthesized speech for the command master slave unit 3am. Therefore, synthesized speech (Vam + Vb + Vc) is transmitted to the command slave slave units 3as1 and 3as2. At this time, the reception master slave unit 3am stops the side sound processing by the voice processing unit 303. The instruction slave slave units 3as1 and 3as2 are not transmitting voices in the first place, and the side processing by the voice processing unit 303 is stopped.

  Due to the operation of the master master unit 3am by the main controller 1, the master master unit 3am and the slave slave units 3as1, 3as2 are owned by other members including the voice of the master master unit 3am. It is possible to listen to the transmission from the handset 3 that performs the operation. In this case, the member who owns the instruction master cordless handset 3am may feel a slight time lag compared to the case where the user's own transmitted voice is processed by side processing and added, but this is actually a problem. Not. According to this embodiment, the command master slave unit 3am cannot hear its own transmission voice, and the command slave slave units 3as1 and 3as2 can hear the voice of the command master slave unit 3am. The problem of not being able to be solved can be solved.

  The operation of the intercom system of this embodiment will be further described with reference to the flowcharts of FIGS. FIG. 6 shows a connection process by the main controller 1, the main unit 2, and the sub unit 3 when the sub unit 3 to be connected to the main unit 2 is set to the command mode by the changeover switch 302. Yes. In FIG. 6, when the slave unit 3 makes a connection request in step S1, the master unit 2 determines whether or not the command slave unit (command master slave unit or command slave slave unit) is already connected. judge. If it is not determined that the command slave unit is connected (NO), the slave unit 3 that has requested connection is the slave unit that first tried to connect to the master unit 2 in the command mode. And the subunit | mobile_unit 3 performs the instruction | command master connection process for setting to an instruction | command master subunit | mobile_unit in step S2.

  Specifically, base unit 2 allocates a radio frequency and a slot to be transmitted / received to / from slave unit 3 in response to a connection request from slave unit 3. The base unit 2 gives a key for transmission / reception to the handset 3 and executes a connection session with the handset 3. This command master connection process is the same as the connection process when the handset 3 to be connected to the base unit 2 is set to the normal operation mode.

  Next, in step S3, main controller 1 does not subtract the voice to be transmitted to the command master slave unit from the synthesized voice as described above without subtracting the voice transmitted from the command master slave unit. It is set to be a synthesized voice including the voice sent from the master slave unit. In step S4, the reception master slave unit sets the side sound processing to be invalid and ends the connection processing.

  On the other hand, if it is determined in step S1 that the command slave unit is connected (YES), the master unit 2 and the slave unit 3 receive a command for setting the command slave slave unit in step S5. Execute the slave connection process and finish the connection process. Specifically, in response to the connection request from the slave unit 3, the master unit 2 assigns a radio frequency and a slot to be transmitted to the slave unit 3, and uses a key for the slave unit 3 to receive voice. give. In addition, a connection session is not performed between the subunit | mobile_unit 3 set to an instruction | indication slave subunit | mobile_unit.

  FIG. 7 shows a transmission process in the command master slave unit. In FIG. 7, the command master slave unit determines whether or not the send button 310 is pressed in step S11. If it is determined that the send button 310 has been pressed (YES), the command master slave unit executes the send 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 command slave slave unit is basically for reception, but there is a possibility that it may be necessary to transmit a speech in case of emergency. Therefore, in the present embodiment, as shown in FIG. 8, the transmission process by the command slave slave unit is realized. In FIG. 8, the command slave slave unit determines whether or not the send button 310 is pressed in step S21. If it is determined that the send button 310 has been pressed (YES), the command master slave unit executes command slave disconnection processing in step S22. As a result, reception of audio from the base unit 2 is stopped.

  In step S23, the command slave slave unit executes connection processing as a normal slave unit. The slave unit 3 transmits a connection request to the closest master unit 2. Therefore, even if the command slave slave unit is, for example, the command slave slave unit 3as1 in FIG. 1, the connection process is not necessarily executed for the master unit 2a. In some cases, connection processing is executed for the parent devices 2b and 2c. The base unit 2 that has received the connection request assigns them to the receiving slave unit if the frequency and slot are available, and gives a key to execute the connection session. The command slave slave unit determines whether or not the normal slave unit has been successfully connected to the master unit 2 in step S24.

  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. It is determined whether or not the button is pressed. If it is determined that the send button 310 is pressed (YES), the receiving slave slave returns the process to step S25 and repeats the determination of step S26. If it is not determined in step S26 that the send button 310 is pressed (NO), the command slave slave unit operates the timer 311 to start counting for a predetermined time in step S27.

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

  If it is determined in step S28 that the count of the timer 311 has expired (YES), the command slave slave unit disconnects in a state in which it is connected to the master unit 2 as a normal slave unit in step S29. Is executed, the reconnection process as the handset is executed, and the process proceeds to step S1 in FIG. As described in FIG. 6, if the command slave unit is not already connected, it is newly connected to the master unit 2 as the command master slave unit, and if the command slave unit is already connected, it is again set as the command slave slave unit. It will be connected to the main unit 2.

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

  As described above, in this embodiment, when the send button 310 is pressed in the command slave slave unit, the one-way communication connection that is the connection as the command slave slave unit to the master unit 2 is once released, It is connected to the master unit 2 as a normal slave unit that communicates bidirectionally. Accordingly, the command slave slave unit shifts to a state in which transmission by the voice input unit 35 is permitted, so that transmission is possible.

  Further, in the present embodiment, when the transmission is terminated by depressing the transmission button 310, the bidirectional communication connection to the parent device 2 is canceled after a predetermined time counted by the timer 311 elapses. It is possible to return to the one-way communication connection that is the connection as the command slave slave unit to the machine 2 again. Therefore, it is possible to limit the time during which the base unit 2 is normally connected as a sub unit. Therefore, it is possible to send a message when necessary even though it is basically a receiving slave unit without impairing the meaning of operating the slave unit 3 in the command mode.

  In the present embodiment, an example has been described in which the slave unit that is first connected to the master unit is the command master slave unit, and the slave unit that is connected to the second and subsequent slaves is the command slave slave unit. You may always set the machine to be an order master slave unit. In this case, if the reception master slave unit is fixedly placed in a place with a good radio wave condition, communication can be performed satisfactorily.

  In this embodiment, the start of transmission is instructed by pressing the send button 310. However, when the voice input unit 305 detects voice input without using the send button 310, transmission starts. VOX (Voice Operated X) control may be performed. In this case, when no voice input is detected for a predetermined time, an instruction to end transmission is given. That is, any transmission instruction unit may be provided.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention. As described above, the receiving slave unit is not limited to a slave unit having no 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 handset mainly receiving.

1 Main controller 2, 2a, 2b, 2c Master unit 3, 3a1, 3a2, 3a3, 3b, 3c Slave unit 3am Command master slave unit 3as1, 3as2 Command slave slave unit 11 Wired transmission / reception unit (transmission unit)
15 Speech synthesis unit 303 Speech processing unit (side sound processing unit)
309 RF receiver (receiver)
310 Send button (send instruction section)

Claims (4)

A main control device, one or more parent devices connected to the main control device, and one or more child devices connected to the parent device,
The master unit is connected to a slave unit for receiving communication in one direction from the master unit in order to receive audio transmitted to a specific slave unit that communicates bidirectionally with the master unit.
The receiving slave is
A transmission instruction unit for instructing transmission;
A voice input unit for sending and receiving,
A timer for counting a predetermined time;
With
When the transmission instruction is instructed by the transmission instruction unit, the one-way communication connection to the parent device is released, and the voice connection is performed as a normal child device that performs bidirectional communication with the parent device. Move to a state that allows transmission by the input unit,
When the transmission is ended by the end of the transmission instruction by the transmission instruction unit, the two-way communication is disconnected from the parent device after the predetermined time counted by the timer has elapsed, An intercom system that returns to a one-way communication connection. The main control device transmits, to the specific slave unit, a first synthesized voice obtained by synthesizing a transmission voice transmitted by each of the slave units including the specific slave unit via the master unit. And
The specific slave unit invalidates the side sound processing that loops the transmission voice transmitted by the specific slave unit and adds it to the voice received from the main control unit,
The intercom system according to claim 1, wherein the reception slave unit receives the first synthesized voice received by the specific slave unit. The main control unit subtracts the transmission voice from the normal slave unit as the transmission destination from the first synthesized voice for the specific slave unit and the normal slave unit other than the reception slave unit. The second synthesized voice is transmitted via the master unit,
Each of the normal slave units performs a side-tone process in which a transmission voice transmitted by each of the normal slave units is loop-processed and added to the second synthesized voice received from the main control device. The intercom system according to claim 2. A control method for an intercom system comprising a main control device, one or more parent devices connected to the main control device, and one or more child devices connected to the parent device,
The master unit is connected to a slave unit for receiving communication in one direction from the master unit in order to receive audio transmitted to a specific slave unit that communicates bidirectionally with the master unit.
The receiving slave is
After transmission of the instruction is performed, it proceeds to disconnect one-way communication to the master unit, connected as Tsujoko machine to communicate bidirectionally with respect to the base unit, the state that permits feeding story Let
When the transmission is ended by the end of the transmission instruction, a predetermined time is counted by a timer,
After the predetermined time has elapsed, the intercom system control method is characterized in that the bidirectional communication connection to the parent device is canceled and the unidirectional communication connection is restored to the parent device.

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