JPS6264191A - Kye telephone set - Google Patents

Abstract

PURPOSE:To control the connection within a prescribed time between a line circuit and a key-dial reception circuit providing a retriggable timer circuit to be actuated by a trigger signal made by an hook-off signal and a key-dial signal. CONSTITUTION:When a key-dial telephone 1 is hooked off, the line circuit 2 detects it, and a trigger signal is outputted to the retriggable timer circuit 3. Then the connection between the circuit 2 and a trunk circuit 5 is disconnected by a connection switching circuit 4, and the circuit 2 and the key-dial reception circuit 6 are connected, which is maintained for a prescribed time until the circuit 3 turns off. If the dial operation is executed with the telephone set 1 within the lapsing of said prescribed time, a key-dial signal is transmitted to the circuit 6 through the circuits 2 and 4. The circuit 6 transmits a dial data to a control circuit 7 and outputs a trigger signal to the circuit 3. Accordingly, the circuit 3 counts again the prescribed time, and the connection between the circuits 2 and 6 can newly maintained for the prescribed time duration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a button telephone device that accommodates a general-purpose push-dial telephone as an extension telephone.

(Prior art) When connecting a button telephone device to a dial line, push-dial call-1? It is necessary to convert it into a dial pulse and send it to the office line, but in this case, the following two transmission methods are available.
There were buildings.

One is that the line circuit is connected to the central office line circuit and a control circuit for converting it into dial pulses.The dial pulse is sent to the central office line, and the push dial signal is also transmitted via the central office line circuit. It is transmitted to the central office line.

The second device transmits a push-dial signal from the push-dial telephone and transmits a push-dial signal to the central office line by cutting off the central office line circuit and the line circuit only while the push-dial receiving circuit is receiving signals. This is to prevent

(Problem to be Solved by the Invention) The former is connected to an exchange that receives both the push dial signal and the dial pulse in order to send both the push dial signal from the push dial telephone and the dial pulse from the office line circuit to all office lines. Otherwise, there is a disadvantage that the exchange will connect incorrectly.

The latter has the disadvantage that it requires a push-dial signal receiving circuit whose rise time for detecting the push-dial signal is short and a delay circuit that delays the entire sound during the rise time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a button telephone device that can overcome the above-mentioned drawbacks.

(Friendly Means to Solve All Problems) In order to achieve the above object, the button telephone device according to the present invention includes a push-dial telephone, a line circuit for detecting all the off-footers of the push-dial telephone, and a push-dial telephone that receives and responds to the push-dial signal. a push dial receiving circuit that outputs dial data; a control circuit that receives the dial data and outputs a control signal; and a station line circuit that creates a dial pulse based on the control signal and sends it to the station line;
It consists of a retriggerable timer circuit, and a connection switching circuit that is switched and controlled by the output of the timer circuit and is connected to either all of the line circuits, the push dial receiving circuit, or the office line circuit, and is connected to the line circuit. The off-hook detection signal triggers all of the timer circuits to connect all of the line circuits to the push-dial receiving circuit, and the received push-dial signal of the push-dial receiving circuit triggers the timer circuit again to maintain this connection state. It is composed of:

According to the above configuration, when the push dial signal is sent, the line circuit is separated from the office line circuit and connected to the goose dial receiving circuit, so that the push dial signal is not sent to the dial pulse office line. Furthermore, there is no need for a push-dial signal receiving circuit and a voice delay circuit, both of which have a short startup time for detecting a push-dial signal.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

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

A general-purpose push-dial telephone 1 is connected to a line circuit 2. The line circuit 2 is connected to either the office line circuit 1 or the push dial receiving circuit 6 by a connection switching circuit 4.

The connection is as shown in the figure except when the dash dial signal is sent. Retriggerable timer circuit 3 is line circuit 2
Alternatively, it is triggered by any signal from the push-dial receiving circuit 6, and controls switching to the connection switching circuit 4', and after being triggered, controls the connection switching circuit 4 to maintain that state for a certain period of time.

The control circuit 7 receives the dial data from the dash dial receiving circuit 6, outputs a control signal, and causes the station line circuit 5 to create and send out dial pulses.

The operation of this device for sending out a selection signal is as follows. When the push-dial telephone 1 goes off-hook, the line circuit 2 detects this and gives a trigger signal to the retriggerable timer circuit 3. The retriggerable timer circuit 3 turns on upon receiving the trigger signal, operates the connection switching circuit M4t, disconnects the indicated line circuit 2 and the office line circuit 5, and disconnects the line circuit 2 and the push dial receiving circuit 6. Connect with. This state continues until the retriggerable timer circuit 3 is turned off after a certain period of time has elapsed.

Therefore, if a dial operation is performed on the push-dial telephone 1 during this fixed period of time, the line circuit 2. A push dial signal is sent to the push dial receiving circuit 6 via the connection switching circuit 4. The push dial receiving circuit 6 sends dial data to the control circuit 7 and also provides a trigger signal to the retriggerable timer circuit 3.

Upon input of this trigger signal, the retriggerable timer circuit 3 measures a certain period of time again from the time of input. When the push-dial receiving circuit 6 receives the next push-dial signal during this fixed period of time, a trigger signal is input, and the same operation as described above is repeated. The connection between the line circuit 2 and the push-dial receiving circuit 6 is maintained by such repeated input of the trigger signal.

On the other hand, each time a push dial signal is input, dial data is sent to the control circuit 7, and the control circuit 7 outputs a control signal corresponding to the dial data. The office line circuit 5 generates all dial pulses based on this control signal and sends them to all office lines 8.

When the dash dial telephone 1 stops dialing, the retriggerable timer circuit 3 is turned off after a certain period of time because trigger No. 15 is no longer input, the connection switching circuit 4 is restored, and the line circuit 2 and office line circuit 5 are switched off. Connected.

(Effects of the Invention) As explained above in detail, the present invention completely disconnects the line circuit and the office line circuit by using a retriggerable timer circuit activated by a trigger signal from an off-hook signal and a push-dial signal. This connects and controls the push-dial receiving circuit.

Therefore, when a push-dial signal is sent out, the push-dial signal is not sent to the office line circuit, and there is no need to use a circuit with a fast detection rise in the push-dial receiving circuit, and there is no need for an audio delay circuit for this purpose. There is an effect.

[Brief explanation of the drawing]

The first case is a blocker showing an embodiment of the button telephone device according to the present invention. 1... Push dial telephone 2... Line circuit 3... Retriggerable timer circuit 4... Connection switching circuit 5... Office line circuit 6...
Push dial receiving circuit 7...Control circuit Patent applicant: NEC Corporation Representative Patent attorney: Inoro Jusai Figure 1

Claims (1)

[Claims] A push-dial telephone, a line circuit for detecting off-hook of the push-dial telephone, a push-dial receiving circuit for receiving a push-dial signal and outputting corresponding dial data, and a control circuit for receiving the dial data and outputting a control signal. , a central office line circuit that creates a dial pulse according to the control signal and sends it to the central office line, a retriggerable timer circuit, which is switched and controlled by the output of the timer circuit, and connects the line circuit to the push dial receiving circuit or the central office line. a connection switching circuit connected to any of the office line circuits; an off-hook detection signal from the line circuit triggers the timer circuit to connect the line circuit to the push dial receiving circuit; 1. A button telephone device, characterized in that said timer circuit is triggered again in response to a received push-dial signal to maintain this connected state.