JPH06233344A - Digital key telephone system - Google Patents

Abstract

PURPOSE:To omit the cable which secures connection between a main device and a repeater device of a radio telephone set with no exclusive interface required in the main device when a cordless extension telephone set is used. CONSTITUTION:A control part 13 of a main device 1 secures connection among an extension telephone interface 11, a trunk line interface 12, etc., via a PCM highway 15 and a data highway 16 in order to attain the trunk line talking and the extension talking. The 1st and 2nd voice signals equivalent to two channels and the control signals equivalent to a single channel are transmitted and received through a cable 4 which secures connection between the interface 11 and an extension telephone set 3. The talking is carried out to the telephone set 3 by means of the 1st voice signals and control signals. Meanwhile the 2nd voice signals and control signals are transmitted and received through a radio telephone repeater device 5 connected to the telephone set 3. So that the talking is possible with a cordless extension telephone set (not shown in the diagram) via the device 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital button telephone device for converting a voice signal into a digital signal to perform exchange and other services for a wired or wireless extension telephone,
Particularly, it relates to a connection configuration of a cordless telephone with respect to a main device.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing an example of a conventional digital button telephone system of this type. For example, when a key operation is performed to make a station line call from the extension telephone 3, a control signal or a voice signal is multiplexed and passes through the cable 4 to transmit the transmission circuit 11 of the extension telephone interface 11 of the main device 1.
Input to 1. The transmission circuit 111 separates the control signal and the audio signal from the signal input via the cable 4,
Control signal to data highway 16 and voice signal to PCM
Output to highway 15. CPU 131 of control unit 13
When receiving the station line call control signal from the extension telephone 3 input through the data highway 16, the server sends a control signal requesting the CPU 121 of the station line interface 12 to capture the station line through the data highway 16. The time switch 132 is controlled so that the station line interface 12 and the extension interface 11 are connected via the PCM highway 15. The CPU 121 of the station line interface 12 captures the station line of the public line 2.

Next, the CPU 131 of the control unit 13 sends a dial signal input via the data highway 16 to the CPU 121 of the central line interface 12, and this CPU
When the dial signal is sent to the office line from 121, the line is thereafter connected to the destination side. In this state, when an analog voice signal is input from the local line to the local line interface 12, the analog voice signal is converted into a digital signal by the codec 122, and then the transmission circuit of the extension interface 11 via the PCM highway 15. It is output to 111. The transmission circuit 111 outputs the input digital voice signal to the extension telephone 3 via the single cable 4.
The extension telephone 3 converts the input digital voice signal into an analog voice signal and outputs it from the transmitter of the handset 36. The voice signal of the user input from the handset of the handset 36 is converted into a digital signal, then multiplexed on the cable 4 and input to the transmission circuit 111 of the extension telephone interface 11. The transmission circuit 111 separates the audio signal from the control signal and sends it to the PCM highway 15. The digital voice signal on the PCM highway 15 is input to the codec 122 of the office line interface 12, where it becomes an analog voice signal on the public line 2.
Dispatched on.

Reference numeral 5 is a radiotelephone relay device, which is connected via a cable 4 to an interface 14 for the radiotelephone relay device provided in the main unit 1. This interface 14 also has a built-in transmission circuit 141, and performs the same operation as the transmission circuit 111 of the extension interface 11. The wireless telephone repeater 5 has a built-in codec for converting a voice signal into a digital signal or a digital voice signal into an analog voice signal, and a radio for wirelessly transmitting a control signal and a digital voice signal to a handset (not shown). The unit is built in. The control unit 13 of the main unit 1 controls the radio telephone relay device 5 via the interface 14 for the radio telephone relay device in the same manner as the extension telephone 3 described above, so that an extension call and a station call to a cordless extension telephone (not shown) can be made. It enables line calls. The wireless telephone repeater 5 is installed and used in an appropriate place such as an area where a cordless extension telephone is desired to be used. Eventually, the control unit 13 of the main device 1 connects the extension telephone interface 11, the wireless relay device interface 14, and the office line interface 12 to each other via the PCM highway 15 and the data highway 16 to make a station line call and an extension line call. It is possible to implement various services such as.

In such a conventional digital key telephone device, a dedicated interface 14 for the wireless telephone relay device for connecting the wireless telephone relay device 5 used when using the cordless extension telephone to the main device 1 is required. Therefore, since this interface is built in the main device 1, the mounting space in the main device 1 must be wide, and the cable 4 for connecting the radio telephone relay device 5 and the interface 14 is required. For this reason, there is a drawback that the size of the main device 1 is increased and the cost of the device is increased, the number of wires is increased, the construction is complicated, and the construction cost is increased.

[0006]

Conventionally, in order to connect a radio telephone repeater for using a cordless extension telephone to the main device of this kind of digital button telephone device, an interface dedicated to this relay device is provided in the main device. In addition, since a cable for connecting the dedicated interface and the radiotelephone relay device is required, the mounting space in the main device must be wide because the interface is built in the main device 1. A cable is required to connect the wireless telephone repeater and the interface. For this reason, there are drawbacks that the main device becomes large and the cost of the device rises, and the number of wires increases, the construction becomes complicated and the construction cost becomes high.

Therefore, the present invention eliminates the above-mentioned drawbacks, and when using a cordless extension telephone, it is possible to omit the cable connecting the main device and the radio telephone relay device without providing a dedicated interface in the main device. It is intended to provide a digital key telephone device that can be used.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to an extension telephone interface for connecting extension telephones in a digital button telephone apparatus which digitizes a voice signal and performs various services such as exchange to a wired or extension extension telephone. The main unit of the key telephone device is equipped with a first signal transmission unit for transmitting and receiving, for each extension telephone, a voice signal for two channels and a control signal for one channel, which are multiplexed for each line, to and from the extension telephone by wire. A second signal that separates a multiplexed signal sent from the first signal transmission unit by wire and multiplexes a plurality of input signals and sends the multiplexed signal to the first signal transmission unit by wire
Signal transmission means and the first audio signal channel and the control signal channel, which are demultiplexed by the second signal transmission means, transmit and receive audio signals and control signals to and from the main device to make an extension telephone call. The extension telephone is provided with an extension telephone call means for performing the above, and a connection means for connecting the second voice signal channel and the control signal channel which are demultiplexed by the second signal transmission means to a radiotelephone relay device. The radiotelephone relay device is configured to use the second voice channel and the control signal channel to relay a call of a cordless extension telephone connected to the relay device by a radio link with the extension telephone. .

[0009]

In the digital key telephone system according to the present invention, the first signal transmission means of the main unit transmits the audio signal for two channels and the control signal for one channel multiplexed for each extension telephone interface for connecting the extension telephones. It transmits and receives by wire to the extension telephone. The second signal transmission means of the extension telephone separates the multiplexed signal sent from the first signal transmission means by wire and multiplexes a plurality of input signals to wire the first signal transmission means to the first signal transmission means. send. The extension telephone call means transmits / receives a voice signal and a control signal to / from the main unit by the first voice signal channel and the control signal channel, which are demultiplexed by the second signal transmission means, to perform an extension telephone call. To do. The connection means of the extension telephone connects the second voice signal channel and the control signal channel, which are demultiplexed by the second signal transmission means, to the radio telephone repeater. The wireless telephone relay device relays, using the second voice channel and the control signal channel, a call of a cordless extension telephone connected to the relay device by a wireless link with the extension telephone.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a digital key telephone device of the present invention. 1 is the main unit of the digital key telephone device, 2 is the public line to which the main unit 1 is connected,
Reference numeral 3 is a wired extension telephone, 4 is a cable for connecting the extension telephone 3 to the main device 1, and 5 is a wireless telephone repeater connected to the extension telephone 3. Further, the main device 1 is an extension telephone interface 1 for connecting a wired extension telephone 3
1, a station line interface 12 for connecting the public line 2, a control unit 13 for controlling the operation of the main device, a PCM highway 15 for transmitting a voice signal (digital), and a data highway 16 for transmitting a control signal (digital) ing.
Further, the extension telephone interface 11 has a transmission circuit 111 that multiplexes / demultiplexes signals, and the station line interface 12
Has a CPU 121 and a codec 122, and has a control unit 13
Has a time switch 132 for switching the signal path between the CPU 131 and the PCM highway 15.

Next, the operation of this embodiment will be described. For example, when an incoming call arrives at the station line interface 12 of the main device 1, the CPU 131 of the control unit 13 causes the station line interface 1
The CPU 121 receives the control signal of the destination via the data highway 16 and outputs the call signal to the extension telephone interface of the destination based on the control signal via the data highway 16. Here, when the interface to which the destination extension telephone or the cordless extension telephone is connected is, for example, the extension telephone interface 11, the control signal is input from the data highway 16 to the transmission circuit 111 of the extension telephone interface 11. Here, the signals are multiplexed on the cable 4 and output to the extension telephone 3. As a result, the extension telephone 3
Is off-hook, this off-hook signal is transmitted from the extension telephone 3 to the transmission circuit 111 of the extension telephone interface 11.
To the data highway 16 after being separated from other signals.

When the off-hook of the extension telephone 3 is detected, the CPU 131 of the control unit 13 controls the time switch 132 to connect the codec 122 of the central line interface 12 and the transmission circuit 111 of the extension telephone interface 11 via the PCM highway 15. . As a result, the voice signal digitized by the codec 122 of the station line interface 12 is input to the transmission circuit 111 of the extension telephone interface 11 through the PCM highway 15, where it is time-division multiplexed with other signals and is transmitted to the cable 4. Sent out. At this time, when the destination is the extension telephone 3 and the cordless telephone, different channels on the PCM highway 15 are used, and the control signal sent to the data highway 16 is also for the extension telephone 3. It is assumed that additional data is attached so that it can be distinguished whether it is a cordless extension telephone or not.

The PCM highway 15 in the main unit 1 normally carries out audio signals for 32 channels by time division multiplexing, and the extension telephone interface 11 takes in the audio signal on the PCM highway 15 to the transmission circuit 111. That is, the transmission circuit 111 takes in two channels of audio signals on the PCM highway 15 according to the system clock and frame synchronization, and at the same time, the data highway 16
The control signals for the above one channel are taken in, all of these signals are time division multiplexed, and the signals are sent to the extension telephone 3 via the cable 4.

FIG. 2 is a block diagram showing a detailed example of the inside of the extension telephone 3. The two-channel audio signal and the control signal transmitted through the cable 4 are input to the transmission circuit 31, where they are separated into the two-channel audio signal B1 and B2 and the control signal for one channel, and the control signal is the CPU3.
2, the audio signal B1 to the codec 33, the audio signal B2
Is output to the codec 34. The codec 33 converts the input audio signal B1 into an analog audio signal and then, via the switching circuit 35, a handset 36 or a speaker 38.
Output to. The switching circuit 35 controls to switch the audio signal from the codec 33 to either the handset 36 or the speaker 38. In addition, the transmission circuit 31
The voice signal B2 separated by is input to the codec 34, converted into an analog voice signal here, and then output to the wireless telephone relay device 5. The wireless telephone relay device 5 transmits the voice signal to a cordless extension telephone (not shown) via a built-in wireless unit. On the other hand, the transmission circuit 31
The control signal separated by is input to the CPU 32, and CP
Based on this, the U 32 controls the extension telephone 3 with respect to the call operation. The CPU 32 distinguishes whether the control signal input from the transmission circuit 31 is for the extension telephone 3 or for the cordless extension telephone. When the control signal is for the cordless extension telephone, the input control signal is input. To the wireless telephone relay device 5. The wireless telephone relay device 5 performs call control based on the transferred control signal,
This control signal is transmitted to a cordless telephone (not shown) via a wireless link.

The voice signal input from either the handset 36 or the microphone 37 is converted into a digital voice signal by the codec 33, and is time-division multiplexed with the other signals on the cable 4 by the transmission circuit 31 and transmitted. It
At this time, the control signal generated from the CPU 32 is also transmitted to the transmission circuit 3
At 1, the signal is time-division multiplexed with other signals and sent out on the cable 4. Similarly, the radio telephone relay device 5 sends the voice signal received from a cordless extension telephone (not shown) to the codec 34 in the extension telephone 3, converts it into a digital voice signal, and outputs it to the transmission circuit 31. Transmission circuit 31
Transmits the voice signal together with other signals onto the cable 4 in a time division multiplexed manner. The control signal from the cordless extension telephone generated at this time is transferred to the CPU 32 via the radio telephone relay device 5. As a result, this control signal is output to the transmission circuit 31 by the CPU 32, and this control signal is also time-division multiplexed and sent out on the cable 4 together with other signals. The power source 39 is the main unit 1
Power is supplied to the cable 4 that connects the transmission circuit 31 and the transmission circuit 31.

FIG. 3 is a block diagram showing a detailed example of the radiotelephone relay device 5 shown in FIG. Wireless telephone repeater 5
A CPU 51 for performing various controls in the apparatus based on the above-mentioned control signals and processing for transferring the control signals to the extension telephone 3 or a cordless extension telephone (not shown),
It has a wireless unit 52 for wirelessly transmitting and receiving voice signals and control signals to and from the cordless telephone. Incidentally, 53
Is an antenna connected to the wireless unit 52.

FIG. 4 is an enlarged view showing an appearance example of the extension telephone 3 and the radio telephone relay device 5 shown in FIG. A radiotelephone relay device 5 is connected to the main body of the extension telephone 3 via a connection cord 6. Reference numeral 54 is an antenna used when forming a wireless link between the device 5 and a cordless telephone (not shown).

According to the present embodiment, the signals transmitted and received between the main unit 1 and the extension telephone 3 via the cable 4 are composed of two-channel digital voice signals and one-channel control signal, and the extension telephone 3 is used. And a transmission circuit 31 for sending one channel of the voice signal to the device itself, separating another channel for the radiotelephone relay device 5 and transmitting it to the radiotelephone relay device 5 via the codec 34. CPU 3 for transferring a control signal not addressed to itself to the wireless telephone relay device 5
2, the transmission circuit 31 time-division-multiplexes a voice signal input from the radio telephone relay device 5 with other signals on the cable 4, and the CPU 32 is input from the radio telephone relay device 5. The radiotelephone relay device 5 is configured to output the control signal to the transmission circuit 31, time-division multiplex this signal with other signals, and transmit the time-division multiplexed signal to the cable 4.
Using the voice signal channels for the channels, relaying voice signals to a cordless extension telephone (not shown),
Since the cordless extension telephone can be controlled using the control signal, the wireless telephone relay device 5 can be connected to the extension telephone 3. Thereby, the main device 1
It is possible to remove the dedicated interface for the radiotelephone relay device 5 from the above, and to eliminate the cable 4 that connects the main device 1 and the radiotelephone relay device 5. Therefore, the space inside the main device 1 can be saved and the number of connecting cables for the main device 1 can be reduced, so that the wiring work can be facilitated, and the main device can be downsized to reduce the device cost. And the installation cost can be reduced.

[0019]

As described above, according to the digital button telephone apparatus of the present invention, when the cordless extension telephone is used, the main apparatus and the radio telephone relay apparatus are connected without providing a dedicated interface in the main apparatus. Since the cable to be used can be omitted, the device cost and the installation cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital key telephone device of the present invention.

FIG. 2 is a block diagram showing a detailed example of the extension telephone set shown in FIG.

FIG. 3 is a block diagram showing a detailed example of the wireless telephone relay device shown in FIG.

FIG. 4 is an enlarged view of the extension telephone and the wireless telephone relay device shown in FIG.

FIG. 5 is a block diagram showing an example of a conventional digital key telephone device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main apparatus 2 ... Public line 3 ... Extension telephone 4 ... Cable 5 ... Radio telephone relay apparatus 11 ... Extension telephone interface 12 ... Station line interface 13 ... Control part 15 ... PCM highway 16 ... Data highway 31, 111 ... Transmission circuit 32 , 121,
131 ... CPU 33, 34, 122 ... Codec 35 ... Switching circuit 36 ... Handset 37 ... Microphone 38 ... Speaker 39 ... Power supply 132 ... Time switch

Claims (1)

[Claims] 1. A digital button telephone device which digitizes a voice signal to perform various services such as exchange for a wired or wireless extension telephone, and is multiplexed for each extension telephone interface connecting an extension telephone. The main unit of the key telephone device is equipped with a first signal transmission means for transmitting and receiving two channels of audio signals and one channel of control signals to the extension telephone by wire, and the first signal transmission means. A second signal transmission means for separating a multiplexed signal sent from the cable from the same and multiplexing a plurality of input signals and sending the multiplexed signal to the first signal transmission means; and the second signal transmission means. An extension line telephone for transmitting and receiving a voice signal and a control signal to and from the main device by the first and second voice signal channels and the control signal channel, which are demultiplexed, to perform an extension telephone call. The extension telephone is provided with a talking / calling means and a connecting means for connecting the second voice signal channel and the control signal channel, which are demultiplexed by the second signal transmitting means, to a radiotelephone relay device. The telephone relay device uses the second voice channel and the control signal channel to relay a call of a cordless extension telephone connected to the relay device by a wireless link with the extension telephone. Button telephone device.