JP3023208B2 - Button phone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone apparatus, and more particularly to an improvement in an extension telephone connection port for connecting a key telephone main apparatus to an extension telephone.

[0002]

2. Description of the Related Art Generally, in a key telephone apparatus, a key telephone main apparatus is provided with a plurality of extension telephone connection ports, and each extension telephone connection port transmits one channel of audio signal. One extension telephone is connected to each extension telephone connection port.

For this reason, in order to increase the number of extension telephones in this type of key telephone apparatus, the number of extension telephone connection ports must be increased. There was also a problem that the number of telephone lines to be drawn out increased and the construction of telephone lines and the like became troublesome.

In addition, the key telephone apparatus is provided with an extension telephone and a cordless telephone, and an interface for converting a voice signal or a control signal into a radio signal must be provided in order to make a call using the cordless telephone. There were problems such as increasing.

The present invention solves the above problem by increasing the number of extension telephones and increasing the number of wires and the number of wires that can be accommodated without increasing the number of extension telephone connection ports if the number of extension telephones is increased to some extent. It is an object to provide a key telephone device that does not need to be increased.

[0006]

To achieve the above object, the present invention provides an extension telephone connection port to which an extension telephone can be connected, an exchange switch for exchanging voice signals, and two or more channels from the exchange switch. Is supplied to the extension telephone connection port in a state of being converted to a multiplexed signal by time division, and the multiplexed signal from the extension telephone connection port is converted into a voice signal of two or more channels to convert the multiplexed signal to the extension telephone. A key telephone system comprising a main unit having a first multiplexer / demultiplexer supplying a connection port, wherein the extension telephone is connectable to at least one radio telephone, Is also
A codec unit for performing digital / analog conversion, and a multiplexed signal from the extension telephone connection port is converted into an audio signal of two or more channels and supplied to the codec unit, and a digital signal from the codec unit is multiplexed. A second multiplexing / demultiplexing device for supplying to the extension telephone connection port, wherein the codec unit converts a predetermined one channel audio signal of the multiplexed signal from the extension telephone connection port into an analog signal. And the other at least one channel audio signal is converted into an analog signal and supplied to the corresponding wireless telephone, and the audio signal from the telephone handset and the audio signal from the wireless telephone are Into a digital signal to convert the second
To the multiplexing / separating device.

[0007]

In the key telephone main unit, the first multiplexing / demultiplexing unit receives audio signals of two or more channels from the exchange switch, converts them into time-division multiplexed signals by time division, and sends them to the extension telephone connection port. I do. In the extension telephone connected to the extension telephone connection port, the second multiplexing / demultiplexing unit converts the time-division multiplexed signal received from the extension telephone connection port into an audio signal of two or more channels.
The audio signal of the channel is sent to the handset, and the audio signal of the other channel is output to the outside.

The second multiplexing and demultiplexing unit converts the one-channel audio signal from the handset and the one-channel audio signal input from the outside into a time-division multiplexed signal by time division, and Send to the telephone connection port. In the key telephone main unit, the first multiplexing / demultiplexing unit converts the time-division multiplexed signal received from the extension telephone connection port into an audio signal of two or more channels and sends it to an exchange switch. A call can be made with an extension telephone or another extension telephone.

As described above, the extension telephone connection port can transmit and receive audio signals of two or more channels, and the extension telephone connected thereto can externally output and input at least one channel of audio signals. Another extension telephone can be connected and used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the key telephone apparatus according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an outline of a key telephone apparatus 10 according to one embodiment of the present invention. The key telephone main unit 11 of the key telephone unit 10 is provided with an exchange switch 12 for inputting / outputting audio signals of many channels and exchanging audio signals between the channels. The switch 12 is connected to a first multiplexing / separating unit 13 constituted by a multiplexing IC or the like. The first multiplexing / demultiplexing unit 13 receives an audio signal of two or more channels (two channels in this embodiment) from the exchange switch 12 and converts the audio signal into a time-division multiplexed signal by time-division. The time-division multiplexed signal received from the primary winding of the pulse transformer 14 is separated into two or more channels of audio signal and sent to the exchange switch 12.

The first multiplexing / demultiplexing unit 13 also has a CPU 16 for inputting / outputting control data for controlling the key telephone main unit 11 and the extension telephone 15.
Is connected. The first multiplexing / separating unit 13 converts the control data received from the CPU 16 into a time-division multiplexed signal together with the audio signal and sends it to the primary winding of the pulse transformer 14. The control data is separated and extracted from the time-division multiplexed signal sent from the CPU 16 and sent to the CPU 16.

An extension telephone connection port 18 is connected to the secondary winding of the pulse transformer 14 via DC blocking capacitors 17 and 17. A DC power supply unit 20 is further connected to the extension telephone connection port 18 via choke coils 19, 19, and this DC power supply unit 20 functions as a power supply for the extension telephone 15.

The extension telephone 15 is connected to the extension telephone connection port 18. A pulse transformer 21 is attached to the extension telephone 15, and an extension telephone connection port 18 is connected to the secondary winding. The primary winding of the pulse transformer 21 has a second multiplex IC or the like.
Multiplexing and demultiplexing unit 22 is connected. The second multiplexing / separating unit 22 separates the time-division multiplexed signal received from the pulse transformer 21 to extract a two-channel audio signal, sends it to the codec unit 23, and outputs the two-channel audio signal to the codec unit 23. Are time-division multiplexed and transmitted to the pulse transformer 21.

The second multiplexing / demultiplexing unit 22 is connected to a CPU 24 for inputting and outputting control data for controlling the extension telephone 15 and the key telephone main unit 11. The second multiplexing / separating unit 22 sends control data separated and extracted from the multiplexed signal received from the pulse transformer 21 to the CPU 24 and
The control data received from the base station is time-division multiplexed together with the audio signal from the codec unit 23 and transmitted to the extension telephone connection port 18 via the pulse transformer 21.

A codec unit 23 converts the digital two-channel audio signal from the second multiplexing / demultiplexing unit 22 into an analog audio signal, and converts the converted one-channel audio signal to a handset 25 such as a handset. ,Also,
Another one-channel audio signal is output to the outside. Further, the codec unit 23 converts the analog audio signal from the handset 25 and the externally input analog audio signal into a digital signal and sends the digital signal to the second multiplexing / demultiplexing unit 22.

Reference numeral 27 denotes a DC power supply connected to the extension telephone connection port 18 via the choke coils 28, 28. The DC power supply 27 receives the power transmitted from the power supply unit 20 of the key telephone main unit 11, and receives the extension telephone 15. Is supplied to each part.

The extension telephone 15 has a cordless telephone 26
2 for providing a telephone as another extension telephone
9. An adapter 31 containing a CPU 30 and the like is connected. The modulator 29 receives a one-channel analog audio signal externally output from the codec unit 23, converts the analog audio signal into a radio signal, and converts the analog audio signal into a radio signal.
And converts a radio signal received by the antenna 32 into an analog audio signal and transmits the analog audio signal to the codec unit 23.

When the antenna 32 transmits a radio signal, the radio signal is received by the antenna 33 of the cordless telephone 26, and a radio transmission signal transmitted from the cordless telephone 26 is received by the antenna 32 via the antenna 33, and is transmitted to the modulator 32. It is sent to the codec unit 23 via 29.

The control data sent from the CPU 30 to the CPU 24 is sent to the second multiplexing / separating unit 22 and the cordless data input to the CPU 24 from the key telephone unit 11 through the second multiplexing / separating unit 22. Control data relating to the telephone 26 is sent to the CPU 30.

Reference numeral 34 denotes a DC power supply for an adapter, which converts power from a commercial power supply into DC power and supplies the DC power to the modulator 29, the CPU 30, and the like.

When the extension telephone 15 and the cordless telephone 26 communicate with each other in the key telephone 11 configured as described above, the voice signals of the extension telephone 15 and the cordless telephone 26 are transmitted to the first and second multiplexing and demultiplexing units. Due to the operation of 13 and 22, the data is also time-division multiplexed and transmitted at the extension telephone connection port 18. Thus, the extension telephone 15 and the cordless telephone 26 can be used by using one extension telephone connection port 18.

Therefore, the extension telephone can be added up to twice the extension telephone connection port 18 without increasing the size of the key telephone main unit 11 or complicating the telephone line.

[0024]

The codec section in the extension telephone is used not only by the extension telephone itself but also by a cordless telephone performing wireless communication with the extension telephone, so that the configuration of the cordless telephone can be simplified and the cost can be reduced. I can do it. Also, since the extension telephone and the cordless telephone can be connected to one extension telephone connection port, extension telephones can be added without increasing the number of extension telephone connection ports, and the system can be easily changed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a key telephone apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 10 key telephone device 11 key telephone main device 12 exchange switch 13 first multiplexing and demultiplexing unit 14 pulse transformer 15 extension telephone 16 CPU 17 DC blocking capacitor 18 extension telephone connection port 19 choke coil 20 DC power supply 21 pulse transformer 22 Second multiplexing and demultiplexing unit 23 Codec unit 24 CPU 25 Handset 26 Cordless telephone 27 DC power supply 28 Choke coil 29 Modulator 30 CPU 31 Adapter 32 Antenna 33 Antenna

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q 3/58 107

Claims (1)

(57) [Claims] 1. An extension telephone connection port to which an extension telephone can be connected, an exchange switch for exchanging audio signals, and a state in which audio signals of two or more channels from the exchange switches are time-divisionally converted into multiplexed signals. To supply to the extension telephone connection port, and to convert the multiplexed signal from the extension telephone connection port into an audio signal of two or more channels and supply the audio signal to the extension telephone connection port.
A key telephone system including a main device having a separation device, wherein the extension telephone is connected to at least one radio telephone, and the extension telephone further comprises a codec for performing digital / analog conversion. And a multiplexed signal from the extension telephone connection port is converted into an audio signal of two or more channels and supplied to the codec unit, and a digital signal from the codec unit is multiplexed and supplied to the extension telephone connection port A second multiplexing / demultiplexing device, wherein the codec unit converts a predetermined one-channel audio signal of the multiplexed signal from the extension telephone connection port into an analog signal, and supplies the analog signal to a handset. Converting another at least one channel audio signal into an analog signal and supplying the analog signal to the corresponding wireless telephone; and Key telephone system and supplying to the multiplexing / separating device and the second and the audio signal into a digital signal from the audio signal and the radio telephone set from Kioku handset.