JPH04369199A - Key telephone system - Google Patents

Abstract

PURPOSE:To realize the key telephone system in which number of extension connection ports is reduced by adopting a time division multiplex signal for a voice signal. CONSTITUTION:A key telephone master set 11 is provided with an extension telephone set connection port 18 to connect an extension telephone set 15 for a key telephone set 10 and with an exchange switch 12 exchanging a voice signal. The key telephone master set 11 is provided with a multiplexer demiltiplexer section 13 which receives voice signals of 2-channels or over from an exchange switch 121 and in which the voice signal is subject to time division and converted into a time division multiplex signal and it is sent to the extension telephone set connection port 18 and in which the time division multiplex signal received from the extension telephone set connection port 18 is converted into voice signals of 2-channels or over and sent to the exchange switch 12.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art and Problems to be Solved by the Invention] Generally, in a key telephone device, a key telephone main device is provided with a plurality of extension telephone connection ports, and each extension telephone connection port sends one channel of audio signals. One extension telephone is connected to each extension telephone connection port.

Therefore, in order to increase the number of extension telephones in this type of button telephone device, it is necessary to increase the number of extension telephone connection ports. There was a problem in that the number of telephone lines to be drawn out was large, making the construction of telephone lines, etc. complicated.

[0004] Furthermore, in order to equip this button telephone device with an extension telephone and a cordless telephone, and to make calls using the cordless telephone, it is necessary to provide an interface for converting voice signals and control signals into wireless signals, which increases the cost. There were problems such as increasing the amount.

[0005] In order to solve the above-mentioned problem, the present invention has been proposed to increase the number of extension telephones by increasing the number of extension telephones and increasing the number of wires so that the number of extension telephones can be increased to a certain extent without increasing the number of extension telephone connection ports. It is an object of the present invention to provide a button telephone device that does not require additional numbers.

[0006]

[Means for Solving the Problems] The present invention receives audio signals of two or more channels from an exchange switch, time-divides these audio signals, converts them into time-division multiplexed signals, and sends the signals to an extension telephone connection port. and a key telephone main device, which is equipped with a first multiplexing and demultiplexing section that converts a time-division multiplexed signal received from an extension telephone connection port into two or more channels of audio signals and sends them to an exchange switch; The time division multiplexed signal received from the telephone connection port is
The audio signal of one predetermined channel is converted into an audio signal of more than one channel, and the audio signal of one predetermined channel is sent to the handset, and the audio signal of the other one channel is output to the outside, and the audio signal of one predetermined channel is outputted to the outside and received from the handset.
An extension telephone equipped with a second multiplexing and demultiplexing unit that time-divisionally converts the channel audio signal and the externally output one-channel audio signal into a time-division multiplexed signal and sends it to the extension telephone connection port. To provide a button telephone device characterized by being provided with.

[0007]

[Operation] In the button telephone main device, the first multiplexing and demultiplexing section 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. do. In the extension telephone connected to this extension telephone connection port, a second multiplexing and demultiplexing section converts the time-division multiplexed signal received from the extension telephone connection port into audio signals 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.

Further, this second multiplexing and demultiplexing section converts the one-channel audio signal from the handset and the one-channel audio signal inputted from the outside into a time-division multiplexed signal by time division. Send to telephone connection port. In the button telephone main device, the first multiplexing and demultiplexing section converts the time-division multiplexed signal received from the extension telephone connection port into two or more channels of audio signals, sends them to the exchange switch, and sends them to the exchange switch. You can make calls to a landline telephone or other extension telephones.

[0009] As described above, the extension telephone connection port can send and receive audio signals of two or more channels, and the extension telephone connected thereto can output and input at least one channel of audio signals to the outside, so that the extension telephone can receive and receive audio signals of two or more channels. You can connect and use another telephone extension.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the button telephone device of 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 device 10 which is an embodiment of the present invention. The key telephone main device 11 of the key telephone device 10 is provided with an exchange switch 12 for inputting and outputting audio signals of many channels and for exchanging audio signals between the channels. A first multiplexing and demultiplexing section 13 composed of a multiplexing IC or the like is connected to this exchange switch 12. This first multiplexing and demultiplexing unit 13 receives audio signals of two or more channels (two channels in the embodiment) from the exchange switch 12, and converts the audio signals into time-division multiplexed signals to the primary of the pulse transformer 14. The time-division multiplexed signal sent to the winding and received from the primary winding of the pulse transformer 14 is separated into two or more channels of audio signals and sent to the exchange switch 12.

A CPU 16 is also connected to the first multiplexing and demultiplexing section 13, which inputs and outputs control data for controlling the key telephone main device 11 and the extension telephone 15. The first multiplexing and demultiplexing unit 13
The control data received from the PU 16 is converted into a time-division multiplexed signal together with the audio signal and sent to the primary winding of the pulse transformer 14, and the time-division multiplexed signal sent from the primary winding of the pulse transformer 14. The control data is separated and extracted from the control data 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, 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 source for the extension telephone 15 .

An extension telephone 15 is connected to the extension telephone connection port 18 . A pulse transformer 21 is attached to this extension telephone 15, and an extension telephone connection port 18 is connected to its secondary winding. The primary winding of the pulse transformer 21 has a second winding composed of a multiplexing IC, etc.
A multiplexing and demultiplexing unit 22 is connected thereto. This second multiplexing and demultiplexing section 22 separates the time-division multiplexed signal received from the pulse transformer 21, extracts two-channel audio signals, sends them to the codec section 23, and receives the two-channel audio signals from the codec section 23. The audio signals are time-division multiplexed and sent to the pulse transformer 21.

A CPU 24 is also connected to the second multiplexing and demultiplexing section 22, which inputs and outputs control data for controlling the extension telephone 15 and the key telephone main unit 11. The second multiplexing and demultiplexing unit 22 sends the control data separated and taken out from the multiplexed signal received from the pulse transformer 21 to the CPU 24, and also time-shares the control data received from the CPU 24 together with the audio signal from the codec unit 23. It is multiplexed and sent to the extension telephone connection port 18 via the pulse transformer 21.

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

Note that 27 is a DC power supply connected to the extension telephone connection port 18 via choke coils 28, 28, and receives power transmitted from the power supply section 20 of the key telephone main device 11 to connect the extension telephone 15. is supplied to each part of the

The extension telephone 15 has a cordless telephone 26.
Modulator 29 for providing the telephone as a separate telephone extension
, an adapter 31 incorporating 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 this analog audio signal into a wireless signal, and sends it to the antenna 32, and also converts the wireless signal received by the antenna 32 into an analog audio signal. The data is then sent to the codec section 23.

When the antenna 32 sends out a radio signal, this radio signal is received by the antenna 33 of the cordless telephone 26, and the radio transmission signal sent from the cordless telephone 26 is received by the antenna 32 via the antenna 33, and is sent to the modulator. The data 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 and demultiplexing section 22, and the control data is input from the key telephone main device 11 to the CPU 24 through the second multiplexing and demultiplexing section 22. Control data related to telephone 26 is sent to CPU 30.

Note that 34 is a DC power supply for the adapter, which converts power from a commercial power source into DC power and supplies it to the modulator 29, CPU 30, etc.

Key telephone main device 1 configured as described above
1, an extension telephone 15 and a cordless telephone 26
When both make a call, the voice signals of the extension telephone 15 and the cordless telephone 26 are time-division multiplexed and transmitted at the extension telephone connection port 18 by the action of the first and second multiplexing and demultiplexing sections 13 and 22. be done. In this way, two extension telephones 15 and cordless telephones 26 can be used using one extension telephone connection port 18.

Therefore, extension telephones can be added up to twice the number of extension telephone connection ports 18 without increasing the size of the key telephone main device 11 or complicating telephone lines.

[0024]

Effects of the Invention In the button telephone device of the present invention, since the extension telephone connection port is capable of transmitting audio signals of two or more channels, extension telephones can be added without adding an extension telephone connection port.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an overview of a button telephone device of the present invention.

[Explanation of symbols]

10 Button telephone device 11 Button telephone main device 12 Replacement 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 section 24 CPU 25　Handset 26 Cordless telephone 27 DC power supply 28 Choke coil 29 Modulator 30 CPU 31 Adapter 32 Antenna 33 Antenna

Claims (2)

[Claims] Claims: 1. A button telephone device having an extension telephone connection port for connecting an extension telephone in the button telephone device, and an exchange switch for exchanging voice signals in a key telephone main device, wherein two It receives audio signals of channels or more, time-divides these audio signals, converts them into time-division multiplexed signals, and sends them to the extension telephone connection port, and also transmits the time-division multiplexed signals received from the extension telephone connection port into two 1. A button telephone device comprising a multiplexing and demultiplexing unit that converts the audio signal into an audio signal of more than one channel and sends the audio signal to the exchange switch. 2. A key telephone device having an extension telephone connection port for connecting an extension telephone and an exchange switch for exchanging voice signals in the key telephone main device, wherein audio from two or more channels is transmitted from the exchange switch. It receives the signals, time-divides these audio signals, converts them into time-division multiplexed signals, and sends them to the extension telephone connection port, and converts the time-division multiplexed signals received from the extension telephone connection port into two or more channels of audio. The key telephone main device, which is equipped with a first multiplexing and demultiplexing unit that converts the signal into a signal and sends it to the exchange switch, and the time-division multiplexed signal received from the extension telephone connection port are converted into audio signals of two or more channels. The predetermined 1-channel audio signal can be sent to the handset and the other 1-channel audio signal can be output externally, and the 1-channel audio signal received from the handset and the 1-channel audio signal input externally can be converted into an extension telephone equipped with a second multiplexing and demultiplexing section that time-divisions and converts the signal into a time-division multiplexed signal and sends it to the extension telephone connection port.