JP2008118261A - Telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone system capable of notifying terminals of participation members under group call where one terminal is about to be disconnected during the group call, and capable of eliminating omission of information transmission. <P>SOLUTION: Disclosed is the telephone system which includes a notification section 13 for outputting a voice message indicating that the specified terminal is about to be disconnected to a control unit 1, wherein the control unit 11 monitors signal reception by a group call trunk 12 from respective members during the group call, instructs the notification section 13 to output the voice message, indicating that the terminal as the member is about to be disconnected, when the group call trunk 12 receives a signal on the information of electric field strength from the member, and outputs the voice message to all the members, via the group call trunk 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a telephone system that realizes simultaneous multi-party calls, and in particular, when there is a portable wireless device that is likely to be disconnected during a group call, it can notify the participants of the group call and improve convenience. It relates to a telephone system that can.

Conventionally, as a telephone system such as a private telephone system or a private PHS system, there has been a telephone system that realizes a group call that is a kind of multi-party simultaneous call.
A group call in the conventional telephone system will be described with reference to FIG. FIG. 10 is a schematic explanatory view showing a call image of a conventional group call.

In general, a telephone system that realizes a group call includes a group call trunk (not shown) that includes a plurality of transmission / reception ports and performs voice multiplexing processing, and includes a group special number that is a group identification number and a group special number. A telephone number of a terminal (member) that performs a group call is set in advance in a control device (not shown) in association with the telephone number.
When one of the members calls the group special number, the control device calls the other member, connects the off-hook member to the group call trunk, and the group call trunk synthesizes the voice of the receiving port. By outputting to the transmission port, a group call in which a plurality of members talk at the same time is performed.

  Then, as shown in FIG. 10, if the terminals 1 to 5 are making a group call, in the conventional group call, any member (here, No. 5) is once after the call is started. If for some reason it is difficult to receive the radio wave, the person and other members will be aware that No. 5 is normally participating in the call without noticing that the communication situation is bad. The group call may continue, and important cues and information may not be delivered to members with poor communication conditions (possibly disconnected in some cases).

  For example, in a situation where there is a large amount of noise, when many people are doing dangerous work, it is very dangerous to continue the work without knowing that there are people who have left or are likely to leave the group call.

Incidentally, as a conventional technology of a telephone system for performing a group call, Japanese Patent Laid-Open No. 2001-28631 “Telephone System” (applicant: Hitachi Kokusai Electric Inc., inventor: Michiko Sugino) published on January 30, 2001 is disclosed. is there.
In this prior art, whether or not a member other than a group member can participate is stored in a group information table for managing a group call, and when a group special number is called from a telephone other than the group member during the group call, the line control is performed. Is a telephone system that allows a caller to participate in a group call if the group can participate other than the group members by referring to the group information table, and effectively uses the conference trunk (group call trunk) It is possible to make a multi-party simultaneous call efficiently.

JP 2001-28631 A

  However, in a conventional telephone system, even if one of the portable wireless devices is likely to be disconnected during a group call, it is not possible to notify the participating members of the group call. There was a problem that important information could not be transmitted to the user of the portable radio apparatus that had been disconnected and disconnected, resulting in a dangerous situation during work.

  The present invention has been made in view of the above circumstances, and when any portable wireless device is likely to be disconnected during a group call, the portable wireless device and telephone of a participating member during the group call It is an object of the present invention to provide a telephone system that can notify the user and eliminate the transmission of information.

  The present invention for solving the problems of the above-described conventional example performs a group call with a group call trunk that synthesizes voices from a plurality of connected portable radios or telephones and sends them to each portable radio or telephone. A unique number of a group and a number of portable radio devices or telephones belonging to the group are stored, and when a unique number of a group is called, a plurality of portable radio devices or telephones belonging to the group are called. And a control unit that connects the off-hook portable radio or telephone to the group call trunk, and when the portable radio has a field strength lower than a specific value, information on the field strength and the portable radio Is transmitted to the control unit, and the control unit indicates that the portable wireless device corresponding to the portable wireless device identifier is likely to be disconnected based on the information on the electric field strength. It notifies the message in the group call trunk group call trunks, characterized in sending a notification message to a plurality of portable radio or telephone in the group call.

  According to the present invention, when the field strength is lower than the specific value, the portable wireless device transmits information on the field strength and the identifier of the portable wireless device to the control unit, and the control unit is configured to transmit the field strength information based on the field strength information. A message indicating that the portable wireless device corresponding to the identifier of the portable wireless device is likely to be disconnected is notified to the group call trunk, and the group call trunk notifies a plurality of portable wireless devices or telephones during the group call. Because it is a telephone system that sends out the received message, if any portable wireless device in a group call is about to disconnect, this can be notified to the participating member's portable wireless devices and telephones. Thus, there is an effect that it is possible to eliminate the leakage of information transmission and improve the convenience of group calls.

[Summary of Invention]
Embodiments of the present invention will be described with reference to the drawings.
The telephone system according to the embodiment of the present invention includes a notification unit that outputs a voice message to the effect that the connection of a specific portable wireless device is likely to be disconnected to the control device. When a signal from a member of the group is monitored for signal reception to the group call trunk and a signal of field strength information (field strength information) is received from the member by the group call trunk, the notification unit is connected to the member's portable radio. Instructs the voice message output that it is likely to be disconnected, and outputs the voice message to all members via the group call trunk, and all that a specific member is likely to be disconnected from the group call. For example, to prompt the owner of a portable radio that is likely to be disconnected to move to a location with good radio In which it is possible to eliminate the transmission leakage.

[System configuration: Fig. 1]
A telephone system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a telephone system according to an embodiment of the present invention.
As shown in FIG. 1, the telephone system (this system) according to the embodiment of the present invention includes a control device 1, a maintenance terminal 2, a base station 3, a telephone 4, and a portable radio device 5. The control device 1 further includes a control unit 11, a group call trunk 12, and a notification unit 13.

Each component will be specifically described.
The control device 1 performs exchange control and group call control of the entire system including the local PHS system and the local telephone system, and also connects to an outside line.
The maintenance terminal 2 is used for setting a group special number and members, setting important terminals to be described later, and the like.

The base station 3 is a base station of the private PHS system connected to the control device 1 and performs wireless transmission / reception with the portable wireless device 5.
The telephone 4 is a telephone terminal connected to the control device 1 via a wired line, and is a terminal that can participate in a group call.
The portable wireless device 5 is a wireless terminal device of the local PHS system, and can participate in group calls via the base station 3. The telephone 4 and the portable wireless device 5 are collectively referred to as “terminal”.

However, in the terminal, the information related to the electric field strength (electric field strength information) is transmitted by the portable wireless device 5 and the telephone set 4 does not transmit the electric field strength information.
In the terminal of the portable wireless device 5, the threshold value (specific value) of the electric field strength is stored in the internal storage unit, and when the electric field strength is measured and falls below the threshold value, the terminal identifier (terminal ID) ) And information indicating that the value is below the threshold value is transmitted as information on the electric field strength.
Note that the terminal of the portable wireless device 5 may not store a threshold value, periodically measure the electric field strength, and transmit the terminal ID and the electric field strength value.

The control unit 11 of the control device 1 controls the entire control device 1 and manages group calls based on group special numbers and member setting operations from the maintenance terminal 2.
In particular, the control unit 11 stores a group call management table, which will be described later, and identification numbers (terminal IDs) and telephone numbers (extension numbers) of the terminals of the telephone 4 and the portable wireless device 5 in association with each other in the internal storage unit. is doing.

  Furthermore, this system monitors the signal reception status from each member to the group call trunk 12 during a group call, and if the received signal is information on the electric field strength, it is carried to the notification unit 13. In addition to outputting an instruction to output a voice message indicating that the radio is likely to be disconnected, the group call trunk 12 is informed of a group special number that is likely to be disconnected.

The information on the electric field strength includes the identification number (terminal ID) of the portable wireless device that has transmitted the signal and information that the electric field strength has fallen below a specific value, or the electric field strength value.
The control unit 11 extracts the terminal ID of the transmission source from the information on the electric field strength, specifies the terminal of the transmission source, and acquires the telephone number (extension number) corresponding to the terminal ID from the storage unit.

  In addition, when the information on the electric field strength includes information indicating that the electric field strength is below a specific value, the control unit 11 provides a voice indicating that the connection with the portable wireless device of the terminal ID is likely to be disconnected. An instruction to output a message is output to the notification unit 13. The portable wireless device in the voice message is specified by the telephone number (extension number) acquired from the storage unit.

  In addition, when the field strength information includes the field strength value, the control unit 11 determines whether the field strength value is lower than the specific value. The telephone number is acquired from the terminal, and a voice message to the effect that the connection of the portable wireless device with the terminal ID is likely to be disconnected is output to the notification unit 13. In this process, the control unit 11 determines whether or not the electric field strength is below a specific value (threshold value).

The notification unit 13 outputs a voice message in accordance with an instruction from the control unit 11. As the voice message, a voice message including the extension number of the terminal that is likely to be disconnected, such as “the terminal connection of the telephone number (extension number) xxxxxx is likely to be disconnected”, can be considered.
Further, the name of the user of the portable wireless device 5 may be stored in association with the identification number (terminal ID), and the name may be added to the voice message for output.

  The group call trunk 12 multiplexes voices of group calls, and multiplexes voices input from a plurality of reception ports and outputs the multiplexed voices to a plurality of transmission ports. The group call trunk 12 normally performs voice multiplex processing for each group in order to realize a group conference of a plurality of groups.

  When a voice message is input from the notification unit 13, the group call trunk 12 of the present system sends a voice message to the transmission port of the terminal that is making a group call using the group special number notified from the control unit 11. Is output. As a result, a voice message notifying that there is a terminal that is likely to be disconnected is output to a plurality of terminals that are in a group call, and it can be recognized that a specific user during a call is likely to be disconnected.

[Group call management table: FIG. 2]
Next, the group call management table stored in the control unit 11 of the control device 1 will be described with reference to FIG. FIG. 2 is a schematic explanatory diagram of a group call management table.
As shown in FIG. 2, the group call management table stores a group call special number and a corresponding member terminal's unique number (terminal number = terminal identifier [terminal ID]) in association with each other. . In the example of FIG. 2, the unique numbers “1”, “2”, “3”,... Of member telephones and portable devices are registered corresponding to the group special number “90”. It should be noted that a name corresponding to each terminal number can be registered in a different user management table.

  In the present system, when a certain group special number is called, the control unit 11 of the control device 1 connects the caller terminal to the group call trunk 12 and refers to the group call management table, The terminal number of the member stored corresponding to the group special number is called. Then, the incoming call is connected to the transmission / reception port of the group call trunk 12, and the group call trunk 12 performs voice multiplexing processing, thereby realizing the group call.

[Operation of this system: Fig. 3]
Next, an operation when notifying that there is a terminal that is likely to be disconnected in this system will be described with reference to FIG. FIG. 3 is a schematic explanatory diagram showing the operation of this system.
As shown in FIG. 3, in a state where terminals 1 to n are performing a group call, the control unit 11 of the control device 1 determines whether the group call trunk 12 has received information on electric field strength from each terminal. It is constantly monitored (1). For example, it is assumed that the electric field strength of the terminal [1] decreases and the terminal 1 is likely to be disconnected (2).

  When the control unit 11 detects information reception of the electric field strength from the terminal [1] (3), the control unit 11 reads the telephone number in the storage unit from the terminal ID included in the information, and the connection of the terminal is likely to be disconnected. The message (data) transmission command is output to the notification unit 13 (4).

  Upon receiving the instruction from the control unit 11, the notification unit 13 outputs a voice message according to the message to the group call trunk 12 (5). Here, if the group call trunk 12 is configured to support a plurality of group calls, the control unit 11 refers to the group call management table and terminals that are likely to be disconnected from the group call trunk 12 are participating. Notify the group special number.

Here, the control unit 11 and the notification unit 13 have different configurations, but the notification unit 13 may be included in the control unit 11 and integrated.
In the above example, when the portable wireless device measures the electric field strength and falls below a specific value (threshold), the information on the electric field strength is transmitted. The field strength information including the terminal identification number and the field strength value is transmitted to the control device 1, and the control unit 11 reads the field strength value from the field strength information and determines the threshold value as the threshold value. If the number is less than, the telephone number may be specified from the identification number of the terminal and a message transmission command may be output to the notification unit 13.

  When a voice message is input, the group call trunk 12 synthesizes the voice and voice message input from the receiving port for the group call of the group special number notified from the control unit 11 (6), and Output to the transmission port.

  Thereby, it is possible to notify all the terminals of the group call participants including the terminal that is likely to be disconnected that the connection of the specific terminal is likely to be disconnected. When the group call trunk 12 outputs a voice message, only the voice message may be output to the transmission port of each terminal without synthesizing the voice and the voice message from each terminal.

[Terminal processing: FIG. 4]
Next, processing at the terminal will be described with reference to FIG. FIG. 4 is a flowchart showing processing in the portable wireless device 5.
In order to realize the processing of FIG. 4, the portable wireless device 5 receives (receives) a radio signal transmitted from the base station via an antenna, and measures (detects) the electric field strength of the radio signal received by the receiving unit. ) Detecting means for determining the electric field strength, generating means for generating the electric field strength information, transmitting means for transmitting the electric field strength information as a radio signal to the base station via the antenna, and the like. Specifically, the determination unit and the generation unit are realized by the control unit in the terminal operating a program stored in the storage unit.

  As shown in FIG. 4, the portable wireless device 5 measures the electric field strength of the radio signal received by the detecting means (S11), and determines whether or not the measured electric field strength is lower than a specific value (threshold value). The determination is made by means (S12). If it is not lower than the specific value (in the case of No), the process returns to step S11.

  When the electric field strength is lower than a specific value (in the case of Yes), the generation means generates electric field strength information including information indicating that the terminal ID and the electric field strength are lower than the threshold value (S13), and transmits them. The information on the electric field strength is transmitted from the means to the control device 1 (S14). And it returns to process S11.

[Control Device Processing: FIG. 5]
Next, processing in the control unit 11 of the control device 1 will be described with reference to FIG. FIG. 5 is a flowchart showing processing in the control unit.
The control unit 11 determines whether or not the information on the electric field strength has been received for the signal received from the portable wireless device 5 (S21). If the information on the electric field intensity has not been received (in the case of No), the process returns to the determination process of process S21.

If the information of the electric field strength is received from the portable wireless device 5 (in the case of Yes), the control unit 11 acquires the terminal ID from the information, reads the telephone number corresponding to the terminal ID from the storage unit, A command to send a message indicating that the connection of the received portable wireless device is likely to be disconnected is output to the notification unit 13 (S22).
The message includes information on a telephone number (extension number) for specifying the portable wireless device.

When the group call trunk 12 can realize a plurality of group calls, the control unit 11 notifies the group call trunk 12 of the group special number including the portable radio that is likely to be disconnected (S23).
As a result, the group call trunk 12 outputs a voice message only to the telephone 4 and the portable wireless device 5 that are making a group call with the group special number. If the group call trunk 12 supports only one group call, the process S23 is unnecessary.

  In the above embodiment, for all portable wireless devices participating in the group call, a voice message notifies that all portable wireless devices are about to be disconnected. However, the terminal ID of the important portable wireless device may be stored in the group call management table corresponding to the group call special number, and the voice message may be output only when the connection of the important portable wireless device is likely to be disconnected.

  Specifically, in FIG. 5, the terminal ID is read from the received electric field strength information between the processing S21 and the processing S22, and the important portable radio device in which the read terminal ID is stored in the group call management table. This can be realized by determining whether it matches any of the terminal IDs (assuming a case where there are a plurality of important portable wireless devices), and adding a process of shifting to the process S22 when they match.

  FIG. 5 shows an example in which the information on the electric field strength is transmitted when the electric field strength measured in the portable wireless device is lower than the threshold value stored in the terminal. When transmitting the intensity value and the terminal ID, it is necessary to add a process for determining by the control unit 11 whether or not the electric field intensity value has fallen below the threshold value before the process S22 of FIG.

  According to this system, since the state that the connection of the portable wireless device participating in the group call is likely to be disconnected is notified to the participating member by a voice message, the owner of the portable wireless device that is likely to be disconnected is notified of the radio wave. There is an effect that it is possible to prompt the user to move to a good place and to eliminate leakage of information transmission.

[Additional technology]
In addition, by providing the control device 1 with the following functions, the present system is not limited to notifying a voice message that the terminal connection is likely to be disconnected, but the terminal connection is disconnected. Since it is also possible to notify that the information has been lost, it is possible to further eliminate the leakage of information transmission.
An example in which the connection of the terminal is disconnected is an off-hook operation in the telephone 4 and a line disconnection due to a poor communication state in the portable wireless device 5.

  In other words, the additional technology in this system includes a notification unit that outputs a notification sound to the control device, and the control unit monitors the connection state between each member and the group call trunk during the group call, and any member And the group call trunk are disconnected, the notification unit is instructed to output a notification sound, and the notification sound is output to other members via the group call trunk. For example, it is possible to notify other members of the absence and to transmit the information by another method, for example, and to eliminate information transmission leakage.

  The configuration for realizing the above function is basically the same as that of FIG. 1, but the disconnection detection process of the control unit 11 and the notification sound transmission process of the notification unit 13 in the control device 1 are added. .

  The control unit 11 of the control device 1 monitors the connection status between each member and the group call trunk 12 during a group call, and outputs a notification sound to the notification unit 13 if there is a disconnected terminal. An instruction is output, and a group special number with a disconnected terminal is notified to the group call trunk 12.

  The notification unit 13 outputs a notification sound in accordance with an instruction from the control unit 11. As the notification sound, a signal sound such as “Peep”, a chime or melody sound, a voice message including the extension number of the disconnected terminal, or the like can be considered.

When a notification sound is input from the notification unit 13, the group call trunk 12 outputs a notification sound to the transmission port of the terminal that is performing the group call using the group special number notified from the control unit 11.
Thereby, a notification sound for notifying that there is a disconnected terminal is output to a plurality of terminals in a group call, and a user in a call can know that someone has disconnected. Further, if the notification sound is a voice message including the terminal number and name, the terminal in a call can accurately recognize which terminal is disconnected.

[Operation of additional technology: Fig. 6]
Next, the operation when notifying that there is a disconnected terminal in this system will be described with reference to FIG. FIG. 6 is a schematic explanatory diagram showing the operation of the additional technology of this system.
As shown in FIG. 6, in a state where terminals 1 to n are performing a group call, the control unit 11 of the control device 1 constantly monitors the connection state between the group call trunk 12 and each terminal (1 ). For example, assume that the terminal 1 is disconnected (2).

When detecting the disconnection (3), the control unit 11 outputs an instruction (notification sound transmission command) to output a notification sound to the notification unit 13 (4).
Upon receiving an instruction from the control unit 11, the notification unit 13 outputs a signal sound prepared in advance to the group call trunk 12 as a notification sound (5).

  Here, if the group call trunk 12 is configured to support a plurality of group calls, the control unit 11 refers to the group call management table, and the group in which the terminal disconnected from the group call trunk 12 has joined. Notify the special number.

When the notification unit 13 outputs a message including the number or name of the disconnected terminal as a notification sound, when the control unit 11 outputs a notification sound transmission command to the notification unit 13, The telephone number in the storage unit is read from the terminal ID, or the name corresponding to the terminal ID is read with reference to the user management table and output to the notification unit 13.
The notification unit 13 converts the terminal number or name into voice data, incorporates it into a message, and outputs it to the group call trunk 12 as a voice message.

  When the notification sound is input, the group call trunk 12 synthesizes the voice input from the receiving port and the notification sound for the group call of the group special number notified from the control unit 11 (6), and Output to the transmission port.

As a result, to all terminals other than the disconnected terminal, a signal sound notifying that one of the terminals has disconnected and a voice message including the number of the disconnected terminal are output. It can inform you that it has been disconnected.
When the group call trunk 12 outputs a notification sound, the notification sound may be output only to the transmission port of each terminal without synthesizing the sound from each terminal and the notification sound.

[Additional processing in control device: FIG. 7]
Next, additional processing of the control unit 11 will be described with reference to FIG. FIG. 7 is a flowchart showing additional processing of the control unit.
As shown in FIG. 7, when the group call is started, the control unit 11 monitors the connection status (“connected” or “disconnected”) between each terminal and the group call trunk 12 in the group (S31). ).

Then, the control unit 11 determines whether or not there is a disconnected terminal (S32). If the disconnected terminal is not detected (in the case of No), the control unit 11 returns to the process S31 and monitors the group call.
Further, when the terminal disconnected in the process S32 is detected (in the case of Yes), the control unit 11 outputs a notification sound transmission command to the notification unit 13 (S33). At this time, the notification unit 13 may be notified of the number of the disconnected terminal and the name of the user corresponding thereto.

  When the group call trunk 12 can realize a plurality of group calls, the control unit 11 notifies the group call trunk 12 of the group special number including the disconnected terminal (S34).

As a result, the group call trunk 12 outputs a notification sound only to a terminal that is making a group call with the group special number. If the group call trunk 12 supports only one group call, the process S34 is not necessary.
In this way, additional processing of the control unit 11 of the present system is performed.

  According to this system, during the group call, the control unit 11 monitors the connection state between the member terminal and the group call trunk 12 and outputs a notification sound to the notification unit 13 when a disconnected terminal is detected. When the group special trunk number is notified to the group conference trunk 12 and the notification unit 13 outputs a notification sound, the group conference trunk 12 is connected to the group special number group call notified from the control unit 11. Since the notification sound is output from the transmission port to all the terminals that are in the middle, if someone is not connected during a group call, it can be notified to other members, and important communication leakage And the effect of preventing the occurrence of dangerous situations.

[Application of additional technology]
In this system, the terminal number of the important terminal corresponding to the group special number is stored in the control unit, and when the important terminal is disconnected during the group call, the other terminal is notified that the important terminal has been disconnected. A notification sound or a voice message may be output.
Alternatively, in the present system, a voice message to end the group call because the important terminal is disconnected may be output to end the group call itself.
As a result, it is possible to notify other members that the central person of the group is not participating, or to cancel the group call in such a state and prevent wasting time It is.

Note that the terminal numbers of the important terminals may be stored in the group call management table shown in FIG. 2 corresponding to each group call special number.
The important terminal is a terminal of an important person when performing a group call with the group special number, and is registered when it is inconvenient if the person does not participate in the group call. Therefore, it is not always necessary to register important terminals corresponding to all group special numbers. A plurality of important terminals may be registered.

  Further, when a group special number is called from a terminal, the control unit 11 calls a terminal number corresponding to the group special number and connects to the group call trunk when it goes off hook. If the connected terminal does not go off-hook for a certain period of time, an instruction to output a notification sound (or message) is output to the notification unit 13, and the group call trunk 12 notifies the other terminals of the notification sound in the same manner as described above. Or after outputting a message, you may make it the control part 11 complete | finish a group call.

  As a message output from the notification unit 13, for example, a message such as “Terminal number XX does not participate and group call is terminated” can be considered. When a message is output from the notification unit 13, the control unit 11 adds the number of the important terminal to the instruction and outputs the instruction.

  Then, the notification sound output from the notification unit 13 is voice-multiplexed by the group call trunk 12 and transmitted from the transmission port to the other member terminals, and the control unit 11 ends the group call.

  According to this system, the member corresponding to the group special number and the important terminal are stored in the control unit 11, and when the control unit 11 requests the group call, the member corresponding to the group special number is called. Determining whether the important terminal has gone off-hook, and if the important terminal has not gone off-hook within a certain time, outputs a notification sound transmission command to the notification unit 13 and notifies the group conference trunk 12 of the group special number; The conference trunk 12 outputs a notification sound from the transmission port to all terminals connected to the group special number group call notified from the control unit 11, and the control unit 11 terminates the group call. Therefore, if a person who is important for the group call does not participate, the group call can be canceled, eliminating unnecessary meetings and improving work efficiency. The effect can be improved.

  Further, according to the present system, during the group call, the control unit 11 monitors the connection state between the important terminal and the group call trunk 12, and when the important terminal is disconnected, the notification unit 13 sends a notification sound transmission command. When the group conference trunk 12 is notified of the group special number and the notification unit 13 outputs a notification sound, the group conference trunk 12 is connected to all the group special number group calls notified from the control unit 11. Since the phone system that outputs a notification sound from the transmission port to the terminal, when an important terminal is not connected during a group call, other members can be notified of this and the group call can be canceled. It is possible to eliminate the useless meeting and improve the work efficiency.

[Another additional technology]
Another additional technique will be described with reference to FIGS. FIG. 8 is a block diagram of the configuration of the portable wireless device, and FIG. 9 is a schematic explanatory diagram showing the operation of another additional technology of the present system.
8 in this system includes a control unit 51 that controls each unit, a reception unit 52 that receives a radio signal, a transmission unit 53 that transmits an audio signal as a radio signal, and telephone directory data. A storage unit 54 for storing, a speaker 56 that outputs a sound signal as sound, a microphone 57 that inputs sound and outputs it as a sound signal, and a background noise generator 58 that generates background noise that can identify a wireless device Have.

As a feature, the background noise generator 58 generates background noise that can identify individual portable wireless devices by sound, and the background noise is input from a microphone 57.
In FIG. 8, background noise is input from the microphone 57, but the background noise is output as data to the control unit 51, and the background noise data is input to the audio signal input from the microphone 57 by the control unit 51. You may make it superimpose.

  By adopting such a configuration of the portable wireless device, background noise unique to the wireless device can be sent to the microphone 57, and other members can hear the background noise flowing during the group call. When the background noise stops flowing (cannot be heard), it can be recognized that the portable wireless device that has generated the background noise is disconnected from the group call.

  Therefore, when the above-mentioned additional technology is applied to this system, a voice message is sent to the member who is likely to disconnect the portable wireless device participating in the group call, and the background noise of the portable wireless device cannot be heard. This has the effect of recognizing that the connection has been disconnected.

  In addition, in this system using the portable wireless device, it is possible to recognize that the connection has been disconnected because the background noise of the portable wireless device can no longer be heard, and to notify that the terminal has been disconnected. There is an effect of confirming the disconnection.

  The present invention is suitable for a telephone system that can improve convenience by notifying a participant when there is a portable wireless device that is likely to be disconnected during a group call.

1 is a configuration block diagram of a telephone system according to an embodiment of the present invention. It is a model explanatory drawing of a group call management table. It is a model explanatory view which shows operation | movement of this system. It is a flowchart which shows the process in a portable radio | wireless machine. It is a flowchart which shows the process in a control part. It is a schematic explanatory drawing which shows the operation | movement of the additional technique of this system. It is a flowchart figure which shows the additional process of a control part. It is a configuration block diagram of a portable wireless device. It is a schematic explanatory drawing which shows the operation | movement of another additional technique of this system. It is a schematic explanatory drawing which shows the call image of the conventional group call.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Control apparatus, 2 ... Maintenance terminal, 3 ... Base station, 4 ... Telephone, 5 ... Portable radio | wireless machine, 11 ... Control part, 12 ... Group call trunk, 13 ... Notification part, 51 ... Control part, 52 ... Reception part 53 ... Transmission unit 53, 54 ... Storage unit, 56 ... Speaker, 57 ... Microphone, 58 ... Background noise generator 58

Claims (1)

A group call trunk that synthesizes voices from a plurality of connected portable wireless devices or telephones and sends them to each portable wireless device or telephone, a unique number of a group that performs group calls, and a plurality of portable wireless devices that belong to the group The telephone number is stored, and when a unique number of the group is called, a plurality of portable radios or telephones belonging to the group are called and off-hook portable radios or telephones are connected to the group call trunk. A telephone system comprising a control unit,
When the portable radio device has an electric field strength lower than a specific value, the electric field strength information and an identifier of the portable radio device are transmitted to the control unit,
The control unit notifies the group call trunk of a message indicating that the portable wireless device corresponding to the portable wireless device identifier is likely to be disconnected based on the electric field strength information,
The group call trunk sends the notified message to a plurality of portable wireless devices or telephones in a group call.

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