JPH04151996A - Key telephone system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a button telephone device that is equipped with a main device and a plurality of extension telephones and is capable of providing a large number of service functions.

2. Description of the Related Art Conventionally, in this type of button telephone device, the main device and the extension telephone are connected by a pair of calling/calling lines and another pair of data/power lines. The data/power line is used to transmit data between the telephone and the main device, such as controlling the telephone's lamp, detecting the press of a function button such as flash or pause, and ringing the tone ringer, and as a power supply line to the telephone.

Problems to be Solved by the Invention However, in the above-mentioned conventional button telephone device, the detection of the press of a function button is all transmitted through the data/power line, which increases the load on the data/power line.
Since there is a possibility of a communication error occurring, there is a problem in that the number of extension telephones connected to the main device must be reduced. Furthermore, since the CPU of the data communication system, which is not directly related to the call/call system, controls these functions, there is a problem that the software of the CPU becomes multiple Mfs.

The present invention solves these conventional problems, and provides a button telephone device that can simplify the connection between the main device and the extension telephone and simplify the software of the data communication system CPU. The purpose is to provide

Means for Solving the Problems In order to achieve the above object, the present invention connects a main device and a plurality of extension telephones with a bus line with a 2N tree for N external lines, and also connects a main device and a plurality of extension telephones with a 2N tree bus line, and also connects a main device and a plurality of extension telephones with a 2N tree bus line, and also connects a main device and a plurality of extension telephones with a 2N tree bus line. D
A of the TMF signals.

The A, B, C, and D signals sent from the extension telephone are modulated into B, C, and D signals and transmitted to the main device, and the main device demodulates the A, B, C, and D signals sent from the extension telephone to the original function signal and executes the function. This is what I did.

action The present invention has the following effects due to the configuration described in item 1.

In other words, when the extension telephone is capturing an outside line, for example, if you press the A key on the numeric keypad to which the flag function is assigned, this is modulated into the A signal of the DTMF signal and sent to the main device, and the main device receives this signal. The sent A signal can be demodulated to the original flash function signal and an outside line can be hooked up.

The embodiment diagram shows the configuration of an embodiment of the present invention. In the figure, 10 is the main device connected to the outside line, 20 is the main device 1
A plurality of extension telephones are connected to the bus line via a pair of extension telephone lines 30 to the telephone. When the number of external lines is N, the extension communication path 30 is set to 2N trees.

In the main device 10, ]O is a power supply circuit, which supplies power generated within the main device 10 to the extension telephone 20 via the feeding circuit 101 and the extension communication path 30. A speech network 102 performs signal conversion between an outside line (two-wire system) and a telephone (four-wire system). ]
03 is a modulation circuit that modulates a signal sent to an outside line into a signal suitable for an outside line (telephone line). A demodulation circuit 104 demodulates the modulated and sent signal into the original signal. 105 is a CPU that controls the entire main device 10. 10G is a data communication interface, 1 and 10 are decoders that perform data communication with the extension telephone 20 via the extension communication path 30, 108 is a DTMF receiver, 109 is a dial flash pause circuit,
The function signal sent from the extension telephone 20 is analyzed and executed. 110 is a dial circuit, and extension telephone 20
If the dial signal sent from is a dial pulse signal, it is converted to a push button dial signal and sent to the outside line.

111 is a relay, and 111A is a relay that creates a station line loop and opens and closes the contact 111a. 111B is a hold relay that opens and closes contact 111b. 112 is a holding circuit, 113
is the incoming circuit.

In the extension telephone 20, 200 is a power supply circuit, 201 is a speech network, 202 is a dialer, 1203 is a modulation circuit, 204 is a demodulation circuit, 205 is a CPU, 206
207 is a data communication interface; 208 is a key matrix; 209 is a ten-key matrix; and 210 is a handset.

Next, the operation of the first embodiment will be explained. In the above embodiment, when the outside line key is pressed from the key matrix 208, the CPU 105 of the main device 10 is activated by the modulation circuit 103 through data communication through the extension line 30.
At the same time, the CPU 205 of the extension telephone 20 operates the modulation circuit 203 and the demodulation circuit 204. Demodulation circuit 104 and modulation circuit 103
The frequencies of the modulation circuit 103 and the demodulation circuit 20 are the same.
Since the frequency of No. 4 is also the same, this results in an outside line call state. When dialing from the extension telephone 20 to make a call to an outside line, a DTMF signal is input from the dialer 202 to the modulation circuit 203, and the output signal passes through the extension communication path 30 and enters the demodulation circuit 104 of the main device 10.
It will be played here. And this dial signal, in the case of a push-button dial signal, is the speech network] -
If it is a dial pulse signal, it passes through the DTMF receiver 108, decoder 107, and dial/fludge/pause circuit 109, and is converted into a push button dial signal by the dial circuit 1]-0, and then is sent to the outside line. will be sent to.

Next, from the numeric keypad matrix 209, A, B, C, and D are assigned a predetermined flash or pause function.
When a key is selected and pressed, the dialer 202 creates A, B, C, and D signals of the DTMF signal according to the pressed key, and sends the modulation circuit 203 - extension communication path 30 - demodulation circuit 10104DT. It is sent to the dial flash pause circuit 109 via the receiver 108-decoder 107. In the dial flash pause circuit 109, if the signal is a pause function, the pause is executed, and if the signal is a flash function, a hooking signal for that purpose is sent to the outside line.

In this way, according to the above embodiment, the flash or pause function is activated by inputting from the A, B, C, and D keys of the numeric keypad matrix 209, and the dialer 202
AB, C, and D signals of the TMF signals are created and transmitted from the modulation circuit 203 of the extension telephone 20 to the demodulation circuit 1 of the main device 10.
04, and a flag is sent to the main device 10 from the extension telephone 20.

Alternatively, the main device 10 can send a signal to the outside line to notify that the pause function has been transmitted.

In the above embodiment, the fludge and pause functions have been explained, but other function keys, such as the redial key, shortcut key, one-touch dial key, etc. Similar effects can be obtained by assigning to the keys up to. In this case, a RAM for dial storage is required inside or external to the dial flash pause circuit 109 of the main device 10.

Effects of the Invention As is clear from the above embodiments, the present invention modulates the function signal sent from the extension telephone to the main device into signals A, B, C, and D of the DTMF signals, and modulates these signals in the main device. Since the function is achieved by demodulating, the function signal can be sent from the extension telephone to the main unit even with simple 2-wire bus line wiring, and the software of the data communication system CPU can be simplified. It has the effect of being able to.

[Brief explanation of drawings]

The figure is a block diagram of a key telephone device showing the configuration of an embodiment of the present invention. 10...Main device, 20...Extension telephone, 3...Extension communication path. 100... Power supply circuit, 101... Feedback circuit, 102... Speech network, 103...
Modulation circuit, 104... Demodulation circuit, 105... CPU
, lO6... data communication interface, 107...
・Decoder, 108...DTMF receiver, 109・
...Dial flash pause circuit, 110...
Dial circuit, 111... Relay 111A... Relay that creates a station line loop 111B... Hold relay 1
11a, 1llb...Relay contact, 112...Holding circuit, 113...Incoming call circuit. 200...Power supply circuit, 201...Speech network, 202...Dialer-203...Modulation circuit,
204... Demodulation circuit, 205... CPU, 206...
・Ring tone generation circuit, 207 ・Data communication interface, 208 ・Key matrix, 209 ・Te○ 30 extension communication path

Claims (1)

[Claims] The main device is connected to a plurality of extension telephones by 2N bus lines for N external lines, and the function signals provided in the extension telephones and sent from the extension telephones are A, B, C, and D of the DTMF signals. means for modulating signals and transmitting them to the main device; and means provided in the main device for demodulating the A, B, C, and D signals sent from the extension telephone into the original functional signals to execute the function. A button telephone device comprising means.