JPS6339198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extension button calling method in a key telephone device.

In the conventional extension button calling system, when the calling party operates the extension calling button to make an extension call, activates the amplifier of the called telephone, and sends out a ringing tone from the speaker of the called telephone. The common terminal side of the button is connected to the power supply inside the telephone, so when receiving calls from the central office line or individual calls such as doorbell calls, if the telephone that does not ring with the individual call setting is receiving an extension call, the Through the extension calling button on the calling side, the amplifier of the called telephone becomes active and receives the central office line incoming tone or the intercom incoming tone, which has the disadvantage that the individual incoming call function is disrupted.

The present invention solves these drawbacks and also facilitates control with other functions.

The present invention will be explained in more detail below with reference to the drawings. FIG. 1 is a circuit diagram showing an extension button calling method in a conventional key telephone device.

In the figure, reference numerals 1 and 2 indicate a central office line trunk having a central office line incoming reception control circuit, 3 a control circuit that receives the signal and controls a tone signal sound source circuit 4 and a gate circuit 5, and 4 a central office line trunk that has a central office line incoming reception control circuit. A sound source circuit that sends out tone signals and extension calling tone signals; 5 a tone signal gate circuit; 6 a main device amplifier; 7 a control that controls the sound source circuit 4 and gate circuit 5 in response to extension calling information from the telephone; 8 is a control circuit for the gate circuit 5; 9 is a doorphone tone signal sending circuit;
Reference numeral 10 denotes a control circuit that receives a call from a handset (not shown in the figure) and sends information to operate the telephone side amplifier to control lines CL1 to CL6, which will be described later.
1 is a main unit; 12 is an individual receiving unit that receives information from office line trunks 1 and 2 and receives calls for each office line; 1;
3 is a doorphone unit, 14 and 15 are telephones, 1
6 and 17 are communication circuits, and 18 and 19 are amplifiers.

C ₁ and C ₂ of the main device 11 are coupling capacitors, D1
~D16 is a loop prevention diode, telephone 1
4 and 15 C3 and C4 are coupling capacitors, TR
1, TR2 is a drive transistor that operates the amplifiers 18 and 19, BK1÷BK6 is an extension call button provided for each extension and used to call an extension, HS is a switch contact of each telephone, L1 of the main unit 11, L2 is the station line, CL1 to CL6
is a control line that controls the operation of the amplifiers of telephones 14 and 15, TN is a tone signal sending line for sending tone signals, P ₁ and P ₂ are extension communication lines, R ₁ and R ₂
is the resistor and SP is the speaker.

Here, when the telephone 14 picks up the handset and calls the extension of the telephone 15, the extension call button is pressed.
By pressing BK1, ground is sent to the control line CL1 through the make contact of the switch HS and the make contact of the button key BK1, through which the transistor TR2 of the telephone 15 is turned on, and the amplifier 19 is turned on. Operate. Also, the control line CL
1 is inputted to the control circuit 7 through the diode D7 of the main device 11, and under the control of the control circuit, an extension ringing tone signal is sent from the sound source circuit 4, and the gate circuit 5 is opened. The extension ringing tone signal is sent to the tone signal line TN through the capacitor C1, the main equipment side amplifier 6, and the capacitor C2, is input to the amplifier 19 of the called telephone 15, is amplified by the amplifier, and is output from the speaker SP. An extension ring tone is sent.

At this time, when a central office line incoming call is received on the central office line trunk 1, the incoming station information from the terminal TC1 of the central office line trunk 1 is input to the individual receiving unit 12, passed through the diode D6, and output to the control line CL6. The transistor TR1 of the telephone 14 connected to the control line CL6 is turned on, and the amplifier 18 becomes operational. At the same time, it is also input to the control circuit 3 of the main device 11, and the tone signal sent from the sound source circuit 4 is switched from the extension ringing tone signal to the office line incoming tone signal, the gate circuit 5 is opened, and the office line incoming tone signal is transferred to the capacitor C1. is input to the input side of the amplifier of each telephone, which is sent to the tone signal transmission line TN through amplifier 6 and capacitor C2. Since the amplifier 18 is in the operating state as described above, the office line incoming tone signal is amplified and sent out from the speaker SP, causing the telephone 14 to ring. When the telephone 14 is not making an extension call, the amplifier 19 of the telephone 15 is not activated due to the individual call setting, so that no central line ringing tone is sent out.

However, since the telephone 14 is making an extension call and the amplifier 19 of the telephone 15 is in operation, the tone signal on the tone signal transmission line TN is amplified and sent from the speaker SP, so that it does not ring as it should in the individual call setting. This had the disadvantage that the incoming call tone of the central office line would sound on a telephone that should not be used, and the individual incoming call setting function would be broken.

Even if you set the individual incoming calls to the doorphone, if a call is received from a doorphone handset not shown in FIG. 1 to the telephone 14, the doorphone unit 1
A control circuit 8 of No. 3 controls the gate circuit 5, and a tone signal is sent out from the tone signal sending circuit 9, and sent to the tone signal sending line TN through the main device amplifier 6 and the capacitor C2. At this time, control circuit 1
0 to the control line CL6 through the diode D16,
It sends out information that operates the telephone side amplifier.
A doorbell call is made to the telephone 14.

However, if an extension button is called on a telephone that does not ring the doorbell ring tone when the individual call setting is set for the doorbell, the individual call setting will be broken and the ring will ring, as described above.

In order to eliminate these drawbacks, the present invention enables extension button calling to be controlled on the main device side, so that calls can be received from the central office line, individual calls from the central office line, individual calls from the doorbell,
Conflict control of extension button calls is performed on the main device side,
By alternately transmitting a central office line incoming tone and an extension calling tone, and by setting individual incoming calls, it is ideally possible to prevent a telephone from ringing if it does not ring.

An embodiment of the extension button calling method of the present invention is shown in FIG. In the figure, the same symbols as in FIG. 1 have the same functions.

In addition, the TR3 of the main device 11 follows the control of the control unit 3 or 81 for incoming calls from the central office line or intercom.
A transistor that controls transistor TR4,
TR4 is the telephone extension call button key BK1~
Transistor, PM, that sends ground power through the switch HS to the common connection point side of BK6
is its power supply line, R3 and R4 are resistors, and D1
7 and D18 are diodes for forming a diode OR between the control sections 3 and 81.

Here, assuming that the telephone 14 picks up the handset and calls the extension of the telephone 15, the extension call button is pressed.
Press BK1. At this time, if there is no incoming call from the central office line or incoming call from the doorbell, the transistor TR4 on the main device side operates and sends out ground power to the sending line PM. Ground is sent to CL1, transistor TR2 of telephone 15 is turned on through control line CL1, and amplifier 1 is turned on.
9 works. Further, the ground of the control line CL1 is inputted to the control circuit 7 through the diode D7 of the main device 11, an extension calling tone signal is sent out from the sound source circuit 4, and the gate circuit 5 is opened. The extension ringing tone signal is sent to the tone signal line TN through the capacitor C1, the main device amplifier 6, and the capacitor C2, inputted to the amplifier 19 of the called telephone 15, amplified by the amplifier, and transmitted from the speaker SP to the extension line. A ring tone is sent.

At this time, when a central office line incoming call is received on central office line trunk 1, the central office line incoming information from terminal TC1 of central office line trunk 1 is input to individual receiving unit 12, passes through diode D6, is output to control line CL6, and is output to control line CL6. Transistor TR1 of telephone 14 connected to control line CL6 is turned on, and amplifier 18 becomes operational.

At the same time, the office line incoming information from the office line trunk 1 is also input to the control circuit 3 of the main device 11, which switches the tone signal output from the sound source circuit 4 from the extension ringing tone signal to the office line incoming tone signal, 5
is opened, and the incoming tone signal from the central office line is transferred to the capacitor C1.
The signal is sent to the tone signal transmission line TN through the main device amplifier 6 and capacitor C2, and is input to the input side of the amplifier of each telephone set.

Here, since the amplifier 18 of the telephone 14 is in the operating state as described above, the station line incoming tone signal is amplified and sent out from the speaker SP.
Telephone 14 rings.

However, the individual receiving unit 12 of the main device 11
, the control line is set to receive individual calls.
CL1 does not receive information about incoming calls from the central office line, and the control line
Transistor TR of telephone 15 connected to CL1
2 is off, and the central office line ring tone does not sound.

Also, although the telephone 14 is currently calling the telephone 15 using the extension button, the control unit 3 of the main device 11
However, when receiving information from the central office line, the transistor TR3 is connected through the diode OR diode D17 and the resistor R3.
By turning off the transistor TR4, the transistor TR4 is cut off. Therefore, since ground is not sent to the sending line PM, even if the extension call button is pressed, the power switch HS and the extension call button BK are
Since the ground is not sent to the control line CL1 through the make contact of 1, the transistor of telephone 15
TR2 is not turned on, and even if the central office line incoming tone signal is input to the amplifier 19, it is not amplified and the speaker
The central office line incoming tone is not sent from the SP. In other words, even if a telephone that does not ring under the individual call setting is called by an extension while receiving a call from the central office line, the telephone will not ring and the individual call setting will not be disrupted. Similarly, in the case where the individual incoming call setting for door intercom calls is made, if a call is received from a door intercom slave unit not shown in FIG.
8. In order to operate the resistor R3, the transistor
TR4 is cut off while the tone is being sent from the door phone tone sending circuit 9. The doorphone tone signal is
The signal is sent to the tone signal transmission line TN via the main device amplifier 6 and the capacitor C2. At the same time, control circuit 1
0 to the control line CL6 through the diode D16,
Sends out information that operates the telephone side amplifier.

At this time, even if the extension button of the telephone 15 that does not sound the doorbell ring tone due to the individual signal setting for incoming door calls is called, the transistor TR4 of the main device 11 is cut off and the line
Ground is not sent to PM. The telephone 15 will not ring due to the individual call reception setting being corrupted.

As explained above, when there is a conflict between the individual incoming settings for incoming calls from the central office line and doorbell and the calling button from the central office line, the power supply for the internal button calling can be cut off on the main device side while the central office line call and doorbell call are being received. This system is extremely effective in preventing a telephone that does not normally receive a central office line incoming tone or a doorbell incoming tone from ringing even if the extension button is called while the central office line or doorbell is receiving a call, because the power supply is cut off. It is a method.

Furthermore, not only incoming calls from the central office line and intercom calls, but also other functions that compete with extension calls can be easily controlled within the main device, which has a very large effect.

[Brief explanation of drawings]

FIG. 1 shows a conventional example, and FIG. 2 shows an embodiment of the present invention. In the figure, 1 and 2 are office line trunks, 3 is a control circuit for the office line, 4 is a sound source circuit for the office line incoming tone signal and extension ringing tone signal, 7 is a control circuit for the extension line, and 9
10 is a door phone tone signal sending circuit, 10 is a control circuit for the door phone, 11 is a main unit, 12 is an individual receiving unit, 13 is a door phone unit, 81 is a gate control circuit for the door phone, and TR3 and TR4 are transistors.

Claims (1)

[Claims] 1. Consisting of a plurality of button telephones and a main device to which the telephones are connected, each telephone is equipped with an amplifier that amplifies a calling signal sent from the main device side and sends it to a speaker, In a button telephone device that makes a call using the speaker of the corresponding telephone when there is an incoming call with individual call settings such as a central office line or a doorbell call, or an incoming call using an extension call button, a power supply for controlling the operation of the amplifier of each telephone. a line is provided in common between the main device and the telephone; the power supply line is connected to a common connection point of the plurality of extension call button keys via a switch in each telephone; A switch circuit is provided to cut off the power supplied to the power supply line, and when the incoming call from the central office line or the doorbell conflicts with the incoming call from the extension, the main unit controls the switch to cut off the extension call, thereby interrupting the extension call. An extension button calling control system for a button telephone device, characterized in that: