JPH07321934A - Circuit for extension speech between telephone sets housing different telephone lines - Google Patents

Abstract

PURPOSE:To enable extension speech between telephone sets housing different telephone lines with each other by providing one of the telephone sets with an intercom extension circuit and providing the other telephone set with an intercom extension circuit and furthermore an intercom line attaching part. CONSTITUTION:At the time of operation for calling the telephone sets 2 from the telephone set 1, a power feeding detection circuit 63 detects speaking current provided for an intercom line 51 so as to send a detected output to a calling control part 62. Then, the calling control part 62 sends a calling signal to a calling circuit 65 and an intercom line 52. This calling signal is detected by the calling detection circuit 44 of the intercom extension line circuit 4. The detection output of the calling detection circuit 44 is sent to a telephone set control part 41. The telephone set control part 41 controls a power feeding circuit 46 to provide a speech current for the intercom line 52 from a speech power source 42. Then, both intercom lines 51 and 52 are provided with the speech current so that the telephone sets 1 and 2 come into a speech possible state by way of the intercom 51-a transformer 61-the intercom line 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extension communication circuit for telephones accommodating different telephone lines through mutual intercom lines.

[0002]

2. Description of the Related Art Conventionally, in order to make a call at a remote place in a home such as a two-family house, an intercom is attached or
I just had to install a new cordless phone that accommodates two lines. In addition, it is possible to make a call through the telephone station by having two cordless telephones at present or by purchasing one cordless telephone if there is only one.

[0003]

However, installing a doorphone or a two-line cordless telephone has a problem in terms of cost, and a telephone call charge is required to make a domestic call using the telephone line, which is extremely permissible. It was difficult.

[0004]

In order to solve these drawbacks of the prior art, the construction of the extension communication circuit of the telephones accommodating different telephone lines according to the present invention is as follows. A telephone control unit, a call power source, a call detection circuit that detects a call signal from an intercom, and the telephone control unit that receives a detection output from the call detection circuit or an operation output for calling a doorphone from a telephone. An intercom extension circuit including a power supply circuit that supplies current from the call power supply to the intercom line, and a first intercom line of a first telephone that accommodates a telephone line and includes the intercom extension circuit; and the telephone. A telephone line accommodating a telephone line different from the line, the transformer connected between the second telephone having the intercom extension circuit and the second doorphone line, the call control unit, and the second telephone from the first telephone. A first power supply detection circuit that detects the current supplied to the first intercom line by the operation of calling the extension of the telephone, and the call control unit receives the detection output of the first power supply detection circuit and outputs the second power supply detection circuit. A second power supply for detecting a current supplied to the second intercom line by an operation of internally calling the first telephone from the second telephone, and a first calling circuit for transmitting a calling signal to the aphone line. The intercom connection unit is provided with a detection circuit and a second calling circuit for transmitting a calling signal to the first intercom line by the calling control section receiving the detection output of the second power supply detection circuit.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram in which a doorphone wire coupling device is connected to doorphone wires of cordless telephones (hereinafter referred to as telephones) which accommodate different telephone lines according to the present invention.
FIG. 2 is a circuit diagram in which two intercoms are connected to a telephone. 1 and 2 are telephones. The illustration of the telephone line is omitted. 3, 30, 4, 40 are intercom extension circuits, 3
1, 41 are telephone control units, 32 and 42 are call power sources, 3
Reference numerals 3, 34, 43 and 44 denote call detection circuits for detecting a call signal from the intercom, and reference numerals 35, 36, 45 and 46 denote call detection circuits 3, 30 (4, 40) for the telephone control unit 31 (41).
A power supply circuit for supplying a current from the call power source by receiving a detection output from the telephone or an operation output for calling an intercom from the telephone, 51 (52) is the telephone 1
(2) The intercom extension circuit 3 (4) accommodates the intercom line, 53 (54) is the intercom line 31 (41) of the telephone 1 (2), and 6 is the intercom line 51. A doorphone line coupling unit that connects the doorphone line 52, 61 a transformer that connects the doorphone line 51 and the doorphone line 52, 62 a call control unit, and 63 (64) a telephone 2 (1) from the telephone 1 (2) The power supply detection circuit for detecting the current supplied to the intercom line 51 (52) by the operation of calling the extension, and 65 (66), the call control unit 62 receives the detection output of the power supply detection circuit 63 (64) A calling circuit for sending a calling signal to 52 (51), 71 (7)
2) is an intercom connected to the intercom line 53 (54). Reference numeral 73 is an intercom connected to the intercom line 51 in FIG.

First, the call response operation between the intercom 71 and the telephone 1 will be described with reference to FIG. When the intercom 71 is operated, the call detection circuit 33 of the intercom extension circuit 30 of the telephone 1 detects this calling signal and sends a detection output to the telephone controller 31. The telephone controller 31 includes a power supply circuit 35.
And the call current is supplied from the call power supply 32 to the doorphone line 53. At this point, the intercom 71 and the telephone 1 are in a callable state. The same applies to the case of calling the telephone 1 from the doorphone 73, so the description thereof will be omitted.

Next, the intercom 71 is operated by operating the telephone 1.
The operation for making the call possible will be described. When the operation for putting the intercom 71 into the call state is performed on the telephone 1, the telephone control unit 31 which receives the operation controls the power supply circuit 35 to supply the call current from the call power supply 32 to the intercom line 53. Here, the intercom 71 and the telephone 1 are in a callable state, and the operator of the telephone 1 can remotely hear the situation around the intercom 71. For example, if one intercom 71 is installed in the infant's room, it is convenient to monitor the state of the lying infant at a remote place. In the above description, the telephone 1 and the intercom 7
Although the operation of the telephone 1 and the doorphone 73 and the telephone 2 and the doorphone 72 perform the same operation, the description thereof will be omitted.

Next, an extension call between telephones accommodating different telephone lines according to the present invention will be described with reference to FIG. When an operation for calling the telephone 2 from the telephone 1 is performed,
In FIG. 1 as well, similar to the operation of calling the intercom 73 from the telephone 1 in FIG. 2, the telephone controller 31 controls the power supply circuit 36 to supply the call current from the call power supply 32 to the intercom line 51. The power supply detection circuit 63 detects the call current supplied to the doorphone line 51 and sends a detection output to the call control unit 62. Then, the call control unit 62 sends a calling signal to the calling circuit 65 through the intercom line 52. The call signal sent to the doorphone line 52 is detected by the call detection circuit 44 of the doorphone extension circuit 4 of the telephone 2. The detection output of the call detection circuit 44 is sent to the telephone control unit 41. The telephone control unit 41 controls the power supply circuit 46 to supply a call current from the call power supply 42 to the doorphone line 52. Door phone line 51 here
Since the call current has been supplied to both the doorphone line 52 and the intercom line 52, the telephone set 1 and the telephone set 2 are in a callable state via the intercom line 51-transformer 61-doorphone line 52.

When the telephone 1 (2) performs a call end operation, the telephone control unit 31 (41) which detects the call termination operation causes the power feeding detection circuit 6 to operate.
Even if the detection output of 3 (64) is received, a malfunction is prevented so that no call is generated until both phones return to the standby state. The operation when calling the telephone 1 from the telephone 2 is also the same as the above-mentioned operation, and therefore the description thereof is omitted.

In the above description of the embodiment, the intercom 7
1 to issue a call signal to the doorphone line 53 and to issue a call signal from the call circuit 65 to the doorphone line 52 by the call control unit 62 of the doorphone line coupling unit 6 means that a pair of doorphone lines to which a call current is supplied are lowered. It is to transmit the state when short-circuited by resistance.

If the intercom extension circuits 3, 30, 4 and 40 are hybrid ICs, downsizing can be achieved. In the above embodiment, since each cordless telephone is provided with a cordless telephone master unit accommodating one telephone line and a plurality of cordless telephone slave units connected to this master unit by a wireless line, calling from an intercom Can be responded to by either the master unit or any of the slave units. Further, it is possible to perform an operation to bring the intercom into a call-enabled state from either the master unit or any of the slave units. Therefore, an extension call using an intercom line can be called from either the master unit or any of the slave units, and the call can be answered by the master unit or any of the slave units. These are achieved by the telephone control unit 31 (41) which has detected the operation from the master unit or the slave unit and controls the speech path switching circuit.

If it is expected to be used in a two-family house in the future, if a cordless telephone having the intercom extension circuit according to the present invention is purchased as the first cordless telephone, the cordless telephone having the same function will be used later. Both parties can make an extension call using a doorphone line.

[0013]

According to the present invention, one of the telephones according to the present invention is provided with the intercom extension circuit, and the other telephone using the different telephone line is provided with the intercom extension circuit and the intercom connection unit to accommodate different telephone lines. This system is expandable and economically effective because it enables extension calls between telephones.

[Brief description of drawings]

FIG. 1 is a circuit diagram in which an intercom connection is connected to an intercom line of cordless telephones accommodating different telephone lines according to the present invention.

FIG. 2 is a circuit diagram in which two intercoms are connected to a telephone.

[Explanation of symbols]

 1 Telephone 2 Telephone 3 Doorphone extension circuit 4 Doorphone extension circuit 31 Control unit 41 Control unit 32 Call power supply 42 Call power supply 34 Call detection circuit 44 Call detection circuit 36 Power supply circuit 46 Power supply circuit 51 Doorphone line 52 Doorphone line 6 Doorphone line coupling unit 61 Transformer 62 Call control unit 63 Power supply detection circuit 64 Power supply detection circuit 65 Calling circuit 66 Calling circuit 71 Doorphone 72 Doorphone

Claims (1)

[Claims] 1. A telephone control unit, a call power source, a call detection circuit for detecting a call signal from an intercom, and the telephone control unit receiving a detection output from the call detection circuit or operating an intercom call from a telephone. An intercom extension circuit including a power supply circuit that supplies an electric current from the call power supply to the intercom line by receiving an output, and a telephone line, and a first intercom extension circuit including the intercom extension circuit.
And a transformer connected between the first intercom line of the telephone set and the second intercom line of the second telephone set, which accommodates a telephone line different from the telephone line and is equipped with the intercom extension circuit. The control unit, the first power supply detection circuit that detects the current supplied to the first intercom line by the operation of calling the second phone from the first phone, and the call control unit detects the first power supply. A first calling circuit for transmitting a calling signal to the second intercom line in response to the detection output of the circuit, and supplying the second intercom line to the second intercom line by an operation of calling the first telephone from the second telephone. And a second calling circuit for sending a calling signal to the first intercom line in response to the detection output of the second power feeding detection circuit. It consists of a door phone line coupling part Internal calls circuit phone comrades accommodate different telephone line characterized by the.