JPH08186873A - Digital cordless telephone system - Google Patents

Abstract

PURPOSE: To realize the multi-address communication to plural slave machines in the bi-directional speech state with an arbitrary called party, in a digital cordless telephone set. CONSTITUTION: This system is composed of at least three first, second and third terminal equipments PS1, PS2 and PS3. When the transmissions are performed by using timewisely different slots in the transmission and reception of slot-composed digital data between a terminal equipment and the other terminal equipment, slot-composed voice data for speech is alternately transmitted by using a prescribed first channel between the first terminal equipment PS 1 and the second terminal equipment PS 2, and the slot-composed voice data for speech transmitted from the first terminal equipment PS 1 is enabled to be received by the third terminal equipment PS 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device in which communication is performed between terminals by transmitting / receiving digital data.

[0002]

2. Description of the Related Art A digital cordless telephone system is constructed, for example, as shown in FIG. In FIG. 5, reference numeral 1 denotes a base unit which serves as a base station, and the base unit 1 is connected to a telephone line and has an antenna 1a for communicating with a handset. A plurality of (three in this case) slaves capable of communicating with the master 1 are prepared. That is, the slaves 2, 3 and 4 are prepared, the antennas 2a, 3a and 4a are attached to the slaves 2, 3 and 4, respectively, and the antenna 1a of the master 1 and the antennas of the slaves 2, 3 and 4 are attached. 2a, 3a, 4
Wireless transmission is performed with a.

When a call is made with each of the slave units 2, 3 and 4 to the master unit 1 (or the other party connected to the master unit 1 via a telephone line), a connection control signal of a predetermined format is transmitted to the master unit 1.
Then, the voice data converted into digital data is transmitted to the base unit 1 in a time division manner with the base unit 1 to make a call.

In such a digital cordless telephone device, the TDD system (time division duplex system) or the TDMA system (time division multiple access system) for transmitting and receiving the same frequency and performing so-called ping-pong transmission is adopted. There is something.

That is, in the case of the TDD system, for example, A in FIG.
, One channel (frequency) is temporally divided into a transmission slot T and a reception slot R, these slots T and R are alternately repeated, and a guard is provided between these slots T and R. A time (not shown) is provided. In this case, for example, each slot T and R is set to about 1 msec and the guard time is set to several tens of μsec. Then, the mobile phone (slave unit) communicates with the base station (master device) in the transmission slot T and receives from the base station in the reception slot R.

Further, in the case of the TDMA method which is a further improved method of the TDD method, as shown in FIG. 6B, the communication between one child device and the parent device is performed within one channel. The transmission slot T and the reception slot R are used only once every several cycles, and the other transmission slot T and the reception slot R in the same channel are used for communication between other slave units and the master unit. Thus, it is multiplexed so that communication can be performed between a plurality of communication devices on one channel.

By being multiplexed in this way, the frequency band prepared for the cordless telephone can be used efficiently. By the way, in the case of performing such communication, the transmission of the control signal from the master unit to each slave unit is performed according to a fixed format every predetermined period. The transmission of this control signal is performed using a channel (frequency band) different from the channel for communication that transmits and receives the data of the slot configuration described above, and each slave unit receives the control signal in the standby state. When the master unit knows that the slave unit has been called, information such as the slot number used for communication between the master unit and the slave unit is transmitted to the slave unit by a control signal, and based on this control signal With such settings, communication such as voice data in time division communication as shown in FIG. 6 is performed using the call channel.

Further, in this type of digital cordless telephone, in addition to the communication between the master unit and the slave unit using this call channel, the call between the slave units using the channel for direct communication between the slave units is also available. Configured to be able to. The direct communication channel between the slave units is a channel in a frequency band different from that of the above-mentioned call channel, but has the same slot configuration as the call channel as shown in FIG. 6B as a channel configuration. . However, unlike the case of using the call channel, the process of calling the callee's handset by sending a connection request signal from the caller's handset in the transmission slot in the handset inter-communication channel When a response signal is received from the called-side child device, transmission / reception of voice data for a call on the inter-child device direct communication channel is started.

Further, when a call between the handset units is made using the channel for direct communication between the handset units, a certain one handset unit (calling side handset unit) can be used for the remaining plurality of handset units (call reception unit). It is conceivable to perform a broadcast communication in which the slave units are simultaneously called.

[0010]

However, in the conventional communication system using the direct communication channel between the slave units, various problems have occurred when performing the broadcast communication.

Here, FIG. 7 shows an example of the case where the broadcast communication is performed using the direct communication channel between the handset units. Here, three handset units PS1, PS2 and PS3 are prepared and one unit is provided. This is a case where the slave unit PS1 of No. 2 performs a broadcast communication for transmitting a message or the like by voice to the other two slave units PS2, PS3. Here, as shown in FIG. 7, the inter-slave device direct communication channel used for transmission in this case is composed of 8 slots per frame and has four transmission slots T1 and T4.
2, T3, T4 and four receiving slots R1, R2, R
3 and R4 are arranged in order. However, the arrangement of the transmission slot and the reception slot is opposite between the calling side child device (A in FIG. 7) and the receiving side child device (B, C in FIG. 7).

Then, from the calling side cordless handset PS1, FIG.
As shown in A of FIG.
Send the voice data you want to convey to each child device one slot at a time,
The receivers PS2 and PS3 on the receiving side receive the slots one by one in the reception slot R1 at the same timing as shown in B and C of FIG. In this case, the voice data of each slot is added with type data indicating that it is a broadcast communication and transmitted.

Then, as a response signal from the incoming side slave units PS2 and PS3 to the outgoing side slave unit PS1, a slave unit PS2 representing the incoming side slave unit (this representative slave unit is preset. 7B, a response signal is transmitted in the transmission slot T1, and this response signal is received in the reception slot R1 by the calling side child device PS1. As the response signal in this case, it is not necessary to transmit the voice data, and it is sufficient to transmit the data notifying that the voice data transmitted from the calling side has been received.

Then, no response signal is transmitted from the remaining receiver PS3.

With this configuration, one child device P
From S1, voice data can be transmitted to other slaves at the same time, for example, voices can be simultaneously output from the speakers of the slaves PS2 and PS3 on the receiving side, and a plurality of points can be called at the same time. it can.

However, in the case of the broadcast communication by this communication method, each of the receiving side slave units outputs only the voice transmitted from the calling side slave unit and listens. I couldn't do it.

Further, after starting the inter-slave communication or the broadcast communication using the channel for the direct communication between the slaves, it is not possible to change the other party to talk with or send to. It was necessary to call another party again to make an extension call after ending the call etc., and the operation was complicated.

In view of these points, the present invention has an object to enable a cordless telephone device of this type to perform a broadcast communication to a plurality of slave units in a state where two-way communication with an arbitrary partner is possible. And

[0019]

SUMMARY OF THE INVENTION The present invention comprises at least three terminals, first, second and third terminals, and a slot-structured digital signal is provided between one terminal and another terminal. In a digital cordless telephone system in which data is transmitted and received using slots that are different in time,
Between the second terminal and the second terminal, the transmission and reception of the voice data for communication in the slot configuration are alternately performed using the predetermined first channel, and the third terminal This is to receive the voice data for a call having a slot configuration transmitted from the first terminal.

Further, in this case, after interrupting the transmission and reception of the voice data for communication in the slot configuration between the first terminal and the second terminal, the first terminal and the third terminal are interrupted. Of the slot-structured voice data for transmission and reception, and the second terminal receives the voice-data for communication of the slot structure transmitted from the first terminal. It's something that you do.

Further, the call voice data received by the first terminal is superimposed on the call voice data transmitted from the first terminal.

Further, in each case, each terminal device is a slave device which transmits the voice data of the slot configuration using the second channel to the master device.

[0023]

According to the present invention, an extension call can be made between two terminals and the extension call voice can be heard by another terminal, and the calling side terminal can use a specific terminal. Broadcasting will be possible only after receiving a voice response from the machine.

In this case, it is possible to obtain a voice response from any of the terminals by changing the party who bidirectionally transmits / receives the voice data for communication.

Further, by making the received call voice data superposed on the call voice data to be transmitted at the calling terminal, it is possible to hear the voice response from any of the terminals. Become.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In this example, TDMA is performed as in the conventional example.
It is applied to the digital cordless telephone system of the method,
The slave unit is configured as shown in FIG. That is, in FIG. 1, reference numeral 11 denotes an antenna, and the wireless unit 12 receives and processes the data received from the master unit or another slave unit by the antenna 11, and supplies the data to the modulation / demodulation unit 13 to demodulate the received data. Then, the demodulated received data is supplied to the ADPCM codec section 15 through the communication control section 14 and received to obtain A.
Digital data of DPCM is used as an analog audio signal, and this analog audio signal is output from the speaker 16.

The voice signal picked up by the microphone 17 is AD
It is supplied to the PCM codec section 15 to be ADPCM digital data, and this digital data is sent to the communication control section 14
The data is supplied to the modulation / demodulation unit 13 via the wireless LAN and modulated for transmission, and the modulated data is wirelessly transmitted from the antenna 11 connected to the wireless unit 12.

Further, the key input section 18 is connected to the ADPCM codec section 1 via the man-machine interface section 19.
5, and the operation information of the key input unit 18 is supplied to the communication control unit 14 side. Further, the display unit 20 is connected to the man-machine interface unit 19 so that the operating state and the like are displayed.

Then, the communication control unit 14 performs control to receive the control signal transmitted from the master unit on a predetermined control channel at a predetermined interval while in the reception standby state, and directly from another slave unit. The control for receiving and transmitting the transmitted direct connection request signal at a predetermined interval is performed.

Then, when the contents of the control signal received by the communication control unit 14 are discriminated and it is judged that this slave unit is called by the connection request signal included in the control signal, or from another slave unit. When it is determined that the child device is called by receiving the direct connection request signal, the communication control unit 14 controls the child device to perform the corresponding operation.

When it is desired to make an outgoing call or an extension call from each child device through communication via the parent device,
With the control of the communication control unit 14, using the control channel,
The connection request signal is transmitted to the master unit.

Further, when it is desired to make a call for direct communication between the handset units from each handset unit by using the channel for direct communication between the handset units, the communication control unit 14 controls the direct communication with other handset units. A direct connection request signal is transmitted to another slave unit using the communication channel (any of the 10 direct communication channels prepared).

As this direct connection request signal, A in FIG.
The data having the slot configuration shown in is transmitted. That is, as the control signal transmitted using the direct communication channel, as shown in FIG. 2A, the start symbol SS, the preamble PR, the unique word UW, the channel type CI, the destination identification code, the origination identification code, the control Bit data is arranged in the order of data CD and error checking parity CRC,
The connection request data is attached to the portion of the control data CD with a predetermined bit. A signal having this slot configuration is transmitted from the calling side slave unit during a transmission slot within a predetermined direct communication channel.

When each slave unit receives this direct connection request signal and determines that a connection to the corresponding slave unit is requested (determined by the destination identification code in the slot data), the transmission slot During the period, a response signal is transmitted to the calling side child device. As the response signal, the control data CD of the control signal shown in A of FIG. 2 is added with data indicating that it is a response to the connection request.

When the calling side child device receives and determines the response signal, thereafter, voice data is included in a predetermined transmission slot between the calling side child device and the called side child device. It enables to communicate by voice by transmitting and receiving the signals of the slot configuration. As a configuration for transmitting the audio data in this case, as shown in FIG. 2B, the start symbol SS, the preamble PR, the unique word UW, the channel type CI, the control data CD, the audio data TCH,
Bit data is arranged in the order of error check parity CRC, and digitalized voice data is arranged in the voice data TCH portion and transmitted.

In the case of this example, the control signal of the slot configuration shown in FIG. 2A is used to control the broadcast communication for calling all the slaves all at once. In this case, as the control data CD of the control signal shown in A of FIG.
In addition to the data indicating that the communication is the broadcast communication, the control data CD is provided with data designating the number of the slave unit for which a voice response is requested.

Then, in the case of transmitting the voice data to each receiver on the receiving side during the broadcast communication, the voice data TCH is transmitted in the communication slot shown in B of FIG.

Further, when a response signal is transmitted from the receiver side which is the side receiving the voice data transmitted during the broadcast communication, the control data CD is provided with data indicating a response. The communication slot shown in B of FIG. 2 (that is, the slot signal including voice data) is transmitted.

Next, when the configuration of the master unit is shown in FIG. 3, as in the case of the slave unit, the data received from the slave unit by the antenna 31 is received and processed by the radio unit 32 and supplied to the modulation / demodulation unit 33 for reception. Demodulate the data. Then, the demodulated received data is supplied to the ADPCM codec section 35 via the communication control section 34, the ADPCM digital data obtained by reception is used as an analog audio signal, and this analog audio signal is supplied to the line interface section 36. , To the analog telephone line connection terminal 37 side.

Further, the analog voice signal obtained from the analog telephone line connection terminal 37 side is supplied to the ADPCM codec unit 35 via the line interface unit 36, and A
The DPCM digital data is supplied to the modulation / demodulation unit 33 via the communication control unit 34 to be modulated for transmission, and the modulated data is wirelessly transmitted from the antenna 31 connected to the wireless unit 32.

Further, the handset 38 is directly connected to the line interface unit 36 so that the telephone can be communicated with the outside line side through the analog telephone line connection terminal 37, and the handset 38 is connected to the ADPCM codec unit 35 side so that the child can be connected. It is possible to make extension calls with the machine. Further, the key input unit 39 is connected to the line interface unit 36 so that various controls such as transmission to an outside line can be performed.

Then, in the communication control section 34 of this master unit,
A dedicated channel (frequency band) prepared for control signal transmission is used to transmit control signals at predetermined intervals, and an arbitrary slave unit is called by this control signal.

Further, the master unit transmits such a control signal and receives the connection request signal transmitted from each slave unit side for a predetermined period. Then, when the connection request signal from this slave is received, the contents of the connection request (calling to an outside line, distinction between an extension call with the master, etc.) are discriminated and a call signal is sent to the corresponding slave. Allocate a slot for transmission of.

Then, using the assigned slot,
It transmits and receives voice data for calls to and from the handset, and performs transmission for external and internal calls.

Next, a description will be given of a process in the case of performing broadcast communication between a plurality of slave units using the digital cordless telephone system composed of the master unit and the slave units described above.

Here, as shown in the connection sequence in FIG. 4, three slave units PS1, PS2 and PS3 are prepared,
It is assumed that one slave unit (calling side slave unit) PS1 performs broadcast communication for simultaneously transmitting calling voice and the like to the remaining slave units (receiving side slave units) PS2 and PS3.

Explaining based on the connection sequence of FIG. 4, first, the calling side handset PS1 calls another handset. At this time, the control signal shown in FIG. 2A is periodically transmitted using a predetermined channel (a channel having an empty slot) in the direct communication channel (step S1). In this case, as the control data CD of the control signal, data indicating that the communication is broadcast is used, and data designating the number of the slave unit for which a voice response is requested is added and transmitted. Here, the child machine P
Designate S2 as a slave for which a response is requested. The control signal indicating the start of the broadcast communication is received by all the handset units other than the calling side handset unit PS1.

Then, in the slave unit PS2 on the receiving side designated as the slave unit for which a response is requested, when the control signal received in the standby state is added with data for requesting a response from this slave unit, the received control signal is received. A synchronization signal is transmitted to the transmission slot in the same frame of the same channel as (step S2). The synchronization signal is, for example, B in FIG.
The synchronization data is inserted in the voice data portion of the communication slot signal shown in FIG.

Then, this synchronization signal is sent to the calling side child device PS1.
When this is received, the calling side handset PS1 also transmits a slot signal in which synchronization data is inserted (step S3).
The slot signal in which the synchronization data is inserted is received by all the handsets other than the calling side handset PS1.

When the receiver PS2 on the receiving side receives the synchronization data from the sender PS1 on the calling side, the slave P2 receives the synchronization data.
Under the control of the communication control unit 14 in S2, processing for ringing a ringing sound is performed.

Then, as a process for responding to this call, when the handset PS2 is put into the off-hook state by operating the key input unit 18, the handset PS2 is called from the handset PS2.
A response signal is transmitted to 1 (step S4). As the response signal, for example, data indicating that a response is given is added to the control signal having the slot configuration shown in A of FIG.

Then, this response signal is sent to the calling side child device PS1.
Then, the voice call is started. That is, the voice picked up by the microphone 17 of the calling handset PS1 is used as voice data TCH, and the voice data TCH is transmitted from the calling handset PS1 in the communication slot shown in B of FIG. 2 (step S5). And the voice picked up by the microphone 17 of the handset PS2 is used as voice data TCH.
The process (step S6) of transmitting CH from the calling side handset PS2 in the communication slot shown in FIG. 2B is repeated at a frame cycle, and a voice call is performed between the two handset PS1 and PS2. .

Then, the other remote station PS3 on the receiving side receives the slot signal containing the voice data TCH transmitted from the remote station PS1 on the calling side in step S5, and the received voice is transmitted to the remote station PS3. Output from the speaker 16.

In this way, broadcast communication is performed to a plurality of slave units, and a voice response from any one slave unit (PS2) can be heard at the calling slave unit. , Usability during broadcast communication is improved.

Then, in this example, the responding party can be changed during the broadcast communication. That is, FIG.
In the connection sequence of step S5 and step S6, while transmitting / receiving the voice data, when it is desired to change the other party who responds, for example, by pressing a predetermined key of the responding handset PS2. By the operation, the process of interrupting the response is performed. As for this processing, for the handset PS1,
A control signal to which data indicating the interruption is added is transmitted (step S7).

When the handset PS1 receives this control signal,
This slave unit PS1 transmits a control signal indicating that it is being suspended to each slave unit PS2, PS3 (step S
8). To the control signal indicating that the suspension is in progress, data designating the number of another slave unit (PS3) for which a voice response is requested is added and transmitted.

When the handset PS3 receives this control signal, the communication control unit 14 in the handset PS3 controls the ringing tone indicating that the call is being interrupted. Then, when the process of responding to the call is performed by the handset PS3, the handset PS3 transmits a synchronization signal to the calling side handset PS1 (step S9).

Then, the synchronization signal is sent to the calling side child device PS1.
Then, after that, a voice call is started between the handset PS1 and the handset PS3. That is, the calling side PS
The voice picked up by the microphone 17 of No. 1 is used as the voice data TCH, and this voice data TCH is transmitted from the calling side handset PS1 to FIG.
Processing for transmitting in the communication slot shown in B (step S
10), and a process in which the voice picked up by the microphone 17 of the handset PS3 is used as voice data TCH and the voice data TCH is transmitted from the calling side handset PS3 in the communication slot shown in B of FIG. 2 (step S11). Is repeated in the frame cycle, and a voice call is performed between the two slaves PS1 and PS3.

Then, the other remote station PS2 on the receiving side receives the slot signal including the voice data TCH transmitted from the remote station PS1 on the calling side in step S10, and the received voice is transmitted to the remote station PS2. Output from the speaker 16.

In this way, it is possible to easily switch the slave unit that responds by voice. And this step S7
By repeating the following process, the handset that responds by voice can be switched as many times as necessary.

In the above-described embodiment, only the voice from the calling side child device is transmitted to each receiving side child device.
For example, when a voice response is received by the calling handset, the voice may be superimposed on the voice data to be transmitted to the receiving handset and transmitted. By doing so, the answering voice can be heard by the callees other than the responding slave, and the usability is further improved.

Further, in the above-mentioned embodiment, the case where the broadcast communication is carried out between the three slave units has been described, but it goes without saying that it is possible to cope with the case where the broadcast communication is carried out by a larger number of slave units.

In the above embodiment, the case where the broadcast communication is performed only between the slaves has been described, but the slave on the called side may include the master. That is, the present invention can be applied to a case where a predetermined one slave unit performs broadcast communication, all the remaining slave units and the master unit simultaneously output calling voices, and requests a response from any one unit. In this case, it is possible to deal with this by allowing the master unit to receive the direct communication channel between the slave units.

[0065]

According to the present invention, an extension call can be made between two terminals and the extension call voice can be heard by another terminal, which is specified by the calling terminal. It becomes possible to carry out the broadcast communication in the state that the voice response is obtained only from the terminal, and the usability during the broadcast communication is improved.

In this case, it is possible to change the party who bidirectionally transmits / receives the voice data for a call, so that it is possible to obtain a voice response from any terminal by a simple switching operation.

In addition, since the call side terminal device superimposes the received call voice data on the call voice data to be transmitted, the call voice and the response voice can be sent from any of the callee side terminals. Can be heard.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a child device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a slot configuration of a transmission signal according to an embodiment.

FIG. 3 is a configuration diagram of a parent device according to an embodiment.

FIG. 4 is an explanatory diagram showing a connection sequence of broadcast communication between handset units according to an embodiment.

FIG. 5 is a configuration diagram showing a system configuration of a cordless telephone device.

FIG. 6 is a configuration diagram showing a communication system.

FIG. 7 is an explanatory diagram showing an example of conventional broadcast communication.

[Explanation of symbols]

 12, 32 Radio part 13, 33 Modulation / demodulation part 14, 34 Communication control part 15, 35 ADPCM codec part

Claims (4)

[Claims] 1. A terminal comprising at least three terminals, first, second and third, and transmitting and receiving time slot digital data between one terminal and another terminal. In a digital cordless telephone system for transmitting data using different slots, transmitting voice data for communication in a slot configuration using a predetermined channel between the first terminal and the second terminal A digital cordless telephone system in which the third terminal receives the voice data for communication in the slot configuration transmitted from the first terminal, while alternately performing reception and reception. 2. After interrupting transmission and reception of voice data for communication in a slot configuration between the first terminal and the second terminal, the first terminal and the second terminal are interrupted. And transmitting and receiving the voice data for communication in the slot configuration to and from the terminal device of No. 3 and the voice data for communication in the slot configuration transmitted from the first terminal device in the second terminal device. The digital cordless telephone system according to claim 1, wherein reception is performed. 3. The digital cordless according to claim 1, wherein the call voice data received by the first terminal is superimposed on the call voice data transmitted from the first terminal. Telephone system. 4. The terminal device is a slave device that transmits, to the master device, voice data having a slot structure using a parent-child communication channel different from the predetermined channel. 3. The digital cordless telephone system according to any one of 3 above.