JP2001177655A - Intercom device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cost performance and to eliminate troublesomeness in the case of laying wirings by perfectly eliminating power consumption in a waiting state thereby reducing the power consumption. SOLUTION: An entrance slave set 1 is provided with a power source circuit 12 for receiving the supply of a commercial power source, a power source multiplexing circuit 13 for multiplexing the power from the power circuit with voice on a transmission line L1 and impressing circuits 14a, 14b and 14c for impressing the commercial power on the power circuit by depressing a call button 10 to hold it. An interior master set 2 is provided with a master set end call detecting circuit 34 for detecting an end call and a power separating circuit 35 for separating the power transmitted by multiplexing from the entrance slave set on the transmission line from voice to supply it to the respective parts of the master set and also for changing a power voltage on the transmission line by the end call detection of the master set end call detecting circuit. The entrance door slave set is provided with a slave set end call detecting circuit 22 for detecting the end call by the change of the power voltage on the transmission line when a call is ended and a disconnecting circuit 15 for releasing the holding of the impressing circuits by the detection of the end call by the slave set end call detecting circuit and for disconnecting the supply of the commercial power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus, and more particularly to an intercom apparatus that completely suppresses power consumption in a standby state and saves power to improve economy.

[0002]

2. Description of the Related Art In a circuit block diagram of FIG. 2 showing the configuration of a conventional door phone apparatus, a first transmission line L consisting of two lines is shown.
Among the terminals T51 and T52 of the entrance slave unit 51 connected to the terminals T61 and T62 of the indoor master unit 52 via
One end of a relay 62a is connected to a commercial power supply (100V AC) and one end of a call switch 60a of a call button 60 composed of two circuit call switches 60a and 60b, and a relay switch 63, respectively. A relay switch 62b is connected in parallel between both ends of 60a. On the other hand, a relay switch 62 is connected to the terminal T52.
A commercial power supply is connected via the relay 6c to the connection point between the switching contact of the relay switch 62c and the commercial power supply.
The other end of 2a is connected.

[0003] Among the terminals T53 and T54 of the entrance slave unit 51 connected to the terminals T63 and T64 of the indoor master unit 52 via the second transmission line L52 composed of two wires, the terminal T53 has a call button 60 on the terminal T53. , A call detection circuit 61 to which the other call switch 60b is connected, a hybrid circuit 68, a voltage detection circuit 69, and one end of a relay 70b that forms a handset end call detection circuit 70 together with an NPN transistor 70a. ing. The hybrid circuit 68 is connected to a slave microphone 64 via a microphone amplifier 66 and a slave speaker 65 via a speaker amplifier 67. Further, the base of an NPN transistor 70a whose emitter and collector are connected to the other end of the relay 70b and the reference potential point, respectively, is connected to the voltage detection circuit 69. On the other hand, the terminal T54 is connected to the reference potential point.

A power supply circuit 80 connected to a reference potential point and a power supply circuit 81 is connected to terminals T61 and T62 of the indoor master unit 52.

[0005] Of the terminals T63 and T64 of the indoor master unit 52, a terminal T63 is connected to a power supply sending circuit 81 and a hybrid circuit 8
4 and the voltage detection circuit 85 are connected to each other. The power supply circuit 81 includes a chime sound generation circuit 82.
, The hybrid circuit 84 and the parent device end-of-call detection circuit 86 are connected to each other. Further, the hybrid circuit 8
4 is connected to a chime sound generating circuit 82 and a handset 83 composed of a master unit microphone and a receiver, and a voltage detecting circuit 85 is connected to a chime sound generating circuit 8.
2 are connected. On the other hand, the terminal T64 is connected to the reference potential point.

In the standby state in which the intercom apparatus configured as described above is waiting for a call from a visitor at the dwelling unit, the call switches 60a and 60b serving as the call buttons 60 of the entrance handset 51 are turned off. State and the relay switches 62b and 62c are also open, so that the terminal T51 is connected from the commercial power supply (AC100V).
And T52, the first transmission line L51, and the terminal T of the indoor master unit 52.
The power supply line to the power supply circuit 80 via 61 and T62 is disconnected.

Here, when the visitor presses the call button 60 of the entrance cordless handset 51 to call the resident in the dwelling unit, the call switches 60a and 60b are turned on, respectively.
Power from a commercial power supply (hereinafter, referred to as AC voltage) is supplied to the relay 62a via the call switch 60a in the ON state and the relay switch 63 which is closed. Relay 62a activated by supply of AC voltage from commercial power supply
Closes the relay switches 62b and 62c, respectively. Thus, a power supply line from the commercial power supply to the power supply circuit 80 of the indoor master unit 52 is formed and held.

The power supply circuit 80 of the indoor master unit 52 converts the AC voltage received through the above-described power supply line into an AC / DC power.
Convert. The DC voltage obtained by the AC / DC conversion in the power supply circuit 80 is supplied from the power supply transmission circuit 81 to the chime sound generation circuit 8.
2. While being supplied to the hybrid circuit 84, the voltage detection circuit 85, and the base unit end-of-line detection circuit 86 to serve as an operation power source, the terminals T63 and T64, the terminal T53 of the entrance terminal 51 and the terminal T53 via the second transmission line L52. The power is supplied to T54 and serves as an operating power supply for each unit (each circuit) that constitutes the entrance device. The chime sound generation circuit 82 is activated by the supply of the DC voltage and generates a ringing tone (hereinafter, referred to as an initial ringing tone).
The first ringing tone is sounded by the receiver of the handset 83 via the hybrid circuit 84.

[0009] The called resident does not respond during or after the first ringing of the ringing tone, and the visitor enters the entrance slave unit 51.
Is pressed again, that is, when the second paging operation is performed, the paging switches 60a and 60b are turned on, and the paging detection circuit 61 that detects this is turned on.
, The potential of the DC voltage on the second transmission line L52 decreases for a certain period of time. This voltage drop is detected by the voltage detection circuit 85 of the indoor master unit 52, and a ringing tone (hereinafter referred to as a re-ringing tone) is generated from the chime sound generation circuit 82 under the control of the voltage detection circuit. This re-ringing tone is sounded by the receiver of the handset 83 via the hybrid circuit 84 in the same manner as the first ringing tone.

When the resident who confirms the first or second call from the visitor by ringing the ringing tone (the first ringing tone or the re-ringing tone) picks up the handset 83 of the indoor master unit 52 and responds, From the parent device microphone and receiver via the hybrid circuit 84, the terminals T63 and T64, the second transmission line L52, the terminals T53 and T54 of the entrance slave device 51, the hybrid circuit 68, the microphone amplifier 66 and the speaker amplifier 67. A communication path for transmitting and receiving a voice signal is formed between the speaker 64 and the child device speaker 65, and a two-way communication between the resident and the visitor is established. When a call is established, the indoor master unit 52
The power supply sending circuit 81 superimposes (multiplexes) the DC voltage converted by the power supply circuit 80 on the audio signal transmitted and received on the second transmission line L52, and supplies the superimposed (multiplexed) audio signal to the entrance device 51. Further, when the call is established, the call button 60 of the entrance slave unit 51 is pressed by the visitor, and the call switch 60
Even if a and 60b are turned on, the potential of the DC voltage on the second transmission line L52 is maintained under the control of the call detection circuit 61.

When the occupant returns the handset 83 of the indoor master unit 52 to end the call with the visitor, when the operation is detected, the master unit end detection circuit 86 detects this operation and the power transmission circuit 8
1 is controlled to lower the potential of the DC voltage supplied from the power supply circuit, thereby lowering the potential of the DC voltage on the second transmission line L52. This potential drop is detected by the voltage detection circuit 69 of the entrance cordless handset 51, and the voltage detection circuit outputs a pulse control signal to the base of the NPN transistor 70a constituting the cordless handset end detection circuit 70, and The relay 70b is activated in a short time when the control signal is set to the high level. The activated relay 70b opens the relay switch 63 for a short time to cut off the supply of the AC voltage from the commercial power supply to the relay 62a. This allows
The relay 62a is deactivated, and the relay switch 62b,
Since each of the doors 62c is opened, the power supply line from the commercial power supply to the power supply circuit 80 of the indoor master unit 52 is disconnected, and the intercom apparatus is restored to the standby state.

[0012]

However, in order to install the entrance cordless handset 51, which is a conventional door phone apparatus, at the entrance of a dwelling unit and the indoor master unit 52 at the dwelling unit, an AC voltage from a commercial power supply must be applied to the entrance door. A first transmission line L51 composed of a strong electric wire supplied to the indoor parent device 52 via the device 51, and a second transmission line L52 for transmitting and receiving audio signals, operating power, and the like between the entrance child device 51 and the indoor parent device 52. From the viewpoint of insulation safety, it is necessary to lay the two transmission paths apart from each other by using a separator or the like, and there is a problem that the wiring is complicated when laying the wiring.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned difficulties, and it is intended to completely reduce power consumption in a standby state, to improve economic efficiency by saving power, and to reduce the power consumption when laying wiring. It is an object of the present invention to provide a door phone device that eliminates the complexity of the above.

[0014]

In order to achieve the above object, a door phone apparatus according to the present invention supplies power from an entrance slave unit to an indoor master unit via a transmission line by pressing a call button, and A door phone device that calls an indoor parent device from a device and performs voice communication between the entrance child device and the indoor parent device. The entrance child device transmits a power supply circuit that is supplied with commercial power and a power supply from the power supply circuit. A power supply multiplexing circuit for multiplexing and supplying voice on the road, and an application circuit for applying and holding commercial power to the power supply circuit by pressing a call button; The end-of-call detection circuit and the power multiplexed on the transmission path from the entrance slave unit are separated from the audio and supplied to each unit of the indoor master unit, and the power supply voltage on the transmission line is detected by the end-of-master detection circuit. Change power supply separation The end unit has a slave end detection circuit that detects an end due to a change in the power supply voltage on the transmission line at the end of the call, and an application circuit when the end detection is detected by the slave end detection circuit. And a disconnection circuit for releasing the supply of commercial power by releasing the holding of the power supply.

In such an intercom apparatus, a power supply line for supplying commercial power to the indoor master unit via a transmission line by pressing a call button is formed in the entrance slave unit, and means for holding the power supply line is provided. Means for disconnecting the power supply line when the call between the visitor and the visitor ends, the power consumption in the standby state in which the intercom apparatus is waiting for a call from the visitor is completely reduced. It is suppressed, and the economic efficiency can be improved by power saving. In addition, since the commercial power supplied to the indoor master unit via the entrance cordless handset is multiplexed with audio on the transmission line and supplied, it is not necessary to lay a strong electric wire as in the conventional example, and when laying the wiring, And the like are eliminated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a preferred embodiment to which a door phone device according to the present invention is applied will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram showing a configuration of an intercom apparatus according to an embodiment of the present invention. An entrance slave unit 1 is installed at an entrance of a dwelling unit (hereinafter referred to as a dwelling unit entrance), and is installed in a dwelling unit. Transmission line L consisting of two wires
It is connected and configured via one.

The entrance cordless handset 1 includes a two-circuit call switch 10a, 10b serving as a call button 10 pressed by a visitor to the dwelling unit to call a resident in the dwelling unit, and a call button 10 (10a, 10b). And a power supply (hereinafter, referred to as AC power supply) from a commercial power supply (AC100V).
A power supply circuit 12 that receives and supplies an AC voltage, and performs AC / DC conversion, and an audio signal that is transmitted / received on the transmission line L1 by a power supply (hereinafter, referred to as a DC voltage) that is AC / DC converted by the power supply circuit 12. And superimposed (multiplexed)
A power supply multiplexing circuit 13 for supplying operation power to each unit (each circuit) constituting the entrance terminal, and a call button 10 (10a,
10b), a relay 14a and a relay switch 14 forming an application circuit (hereinafter referred to as a relay power supply circuit) for applying and holding an AC voltage from a commercial power supply to the power supply circuit 12 by holding down the power supply circuit 12
b and 14c, a relay switch 15 forming a disconnection circuit (hereinafter referred to as a relay disconnection circuit) for releasing the holding state of the relay power supply circuit and cutting off the application of the AC voltage from the commercial power supply to the power supply circuit 12, and A handset microphone 16 and a handset speaker 17 for transmitting and receiving a voice signal for establishing a call with the called resident; a microphone amplifier 18 for amplifying a voice signal (transmitted voice) from the handset microphone 16; Speaker amplifier 19 for amplifying a resident's voice signal (received voice) sounded by the loudspeaker 17, and a hybrid for forming a signal transmission line for a microphone amplifier 18 and a voice signal transmitted and received between the speaker amplifier 19 and the terminal T1. Circuit 20, a change in power supply voltage (DC voltage) on the transmission line L1,
Here, a voltage detection circuit 21 for detecting a potential drop, and a slave unit end detection circuit controlled by the voltage detection circuit 21 to detect the end of a call between a resident and a visitor and open a relay switch 15 forming a relay disconnection circuit An NPN transistor 22a and a relay 22b are provided.

The indoor master unit 2 has a chime sound generating circuit 30 for generating a ringing sound for informing a resident of a call from a visitor, and a pick-up resident for picking up a call and responding to the call. A handset 31 including a base unit microphone and a receiver for transmitting and receiving a voice signal for establishing a call, and a signal transmission line for causing the receiver of the handset 31 to ring a ringing tone generated by the chime sound generation circuit 30, or A hybrid circuit 32 forming a signal transmission line for audio signals transmitted and received between the microphone and the receiver of the handset 31 and the terminal T11.
Before the resident picks up the handset 31 and responds, the visitor presses the call button 10 of the entrance slave 1 again.
That is, a voltage detection circuit 33 for detecting the second call operation based on a decrease in the potential of the DC voltage on the transmission line L1, and an end call in which the resident returns the handset 31 to end the call with the visitor. A parent device end-of-call detection circuit 34 for detecting an operation;
The DC voltage multiplex-transmitted on the transmission line L1 from the entrance slave unit 1 is separated from the audio signal to be used as an operation power supply for each unit (each circuit) constituting the indoor master unit, and the master unit end-of-call detection circuit 3
A power supply separation circuit 35 is provided to change the DC voltage on the transmission line L1 under the control of 4, and lower the potential here.

Of the terminals T1 and T2 of the entrance cordless handset 1 connected to the transmission line L1, the terminal T1 is connected to the other call switch 10b of the call button 10 comprising two circuits of call switches 10a and 10b. One end of a relay 22b forming a power detection circuit 11, a power supply circuit 12, a hybrid circuit 20, a voltage detection circuit 21, and a handset end call detection circuit 22 is connected via a power supply multiplexing circuit 13. The power supply circuit 12 connected to the reference potential point has a commercial power supply (A
C100V), one end of a call switch 10a of the call button 10, and one end of a relay 14a forming a relay power supply circuit via a relay switch 15 forming a relay disconnecting circuit, and a relay between both ends of the call switch 10a. A relay switch 14b forming a power supply circuit is connected in parallel. The power supply circuit 12 is connected to a commercial power supply via a relay switch 14c forming a relay power supply circuit, and the other end of the relay 14a is connected to a connection point between the switching contact of the relay switch 14c and the commercial power supply. . Also,
The hybrid circuit 20 is connected to a slave unit microphone 16 via a microphone amplifier 18 and a slave unit speaker 17 via a speaker amplifier 19. Further, the voltage detection circuit 20 is connected to a base of an NPN transistor 22a, which forms a slave unit end detection circuit 22, and has an emitter and a collector connected to the other end of the relay 22b and a reference potential point, respectively. On the other hand, the terminal T2 is connected to the reference potential point.

Among the terminals T11 and T12 of the indoor master unit 2 connected to the transmission line L1, the terminal T11 is connected to the hybrid circuit 3
2, the voltage detection circuit 33, and the power supply separation circuit 35 are connected to each other. The hybrid circuit 32 includes
The chime sound generation circuit 30 and the handset 31 are connected to each other, and the voltage detection circuit 33 is connected to the chime sound generation circuit 30. Further, the power supply separation circuit 35 includes a chime sound generation circuit 30, a hybrid circuit 32, a voltage detection circuit 33, and a base unit end-of-call detection circuit 34.
Are connected respectively. On the other hand, the terminal T12 is connected to the reference potential point.

The operation of the intercom apparatus configured as described above will be described below.

In a standby state in which the intercom apparatus is waiting for a call from a visitor at a dwelling unit, call switches 10a, 10a serving as call buttons 10 of the entrance slave unit 1 are set.
The power supply line from the commercial power supply (100 VAC) to the power supply circuit 12 is disconnected because b is in an off state and the relay switches 14b and 14c forming the relay power supply circuit are also opened. As a result, in the standby state, the power (power consumption) from the commercial power supply consumed by the indoor master unit 2 via the entrance slave unit 1 and the transmission line L1 is completely suppressed, and power saving can be achieved.

Here, when the visitor presses the call button 10 of the entrance cordless handset 1 in order to call the resident in the dwelling unit, the call switches 10a and 10b are turned on, and the power from the commercial power supply (hereinafter, AC power) is turned on. (Referred to as a voltage) is supplied to a relay 14a forming a relay power supply circuit via a call switch 10a in an ON state and a relay switch 15 forming a closed relay disconnection circuit. The relay 14a activated by the supply of the AC voltage from the commercial power supply closes the relay switches 14b and 14c, respectively. Thus, a power supply line from the commercial power supply to the power supply circuit 12 is formed and held.

The power supply circuit 12 of the entrance device 1 performs AC / DC conversion of the AC voltage received via the above-described power supply line. The DC voltage obtained by the AC / DC conversion in the power supply circuit 12 is supplied from the power supply multiplexing circuit 13 to each unit (each circuit) forming the entrance terminal and becomes an operation power supply, and the terminal T
1 and T2, the transmission path L1, and the power supply separation circuit 35 via the terminals T11 and T12 of the indoor master unit 2. The power supply separation circuit 35 supplies the received DC voltage to the chime sound generation circuit 30, the hybrid circuit 32, the voltage detection circuit 33, and the base unit end-of-call detection circuit 34, and uses them as operation power. The chime sound generation circuit 30 is activated by the supply of the DC voltage, and generates a ringing sound (hereinafter, referred to as an initial ringing sound) for informing a resident of a call from a visitor. The first ringing tone is sounded by the receiver of the handset 31 via the hybrid circuit 32.

If the called resident does not respond during or after the initial ringing of the ringing tone, and the visitor presses the call button 10 of the entrance slave unit 1 again, that is, when the second ringing operation is performed. , The call switches 10a and 10b are turned on, and the control of the call detection circuit 11 that detects this causes the potential of the DC voltage on the transmission line L1 to decrease for a certain period of time. This voltage drop is detected by the voltage detection circuit 33 of the indoor master unit 2, and a ringing tone (hereinafter referred to as a re-ringing tone) is generated from the chime sound generation circuit 30 under the control of the voltage detection circuit. This re-ringing tone is sounded by the receiver of the handset 31 via the hybrid circuit 32 in the same manner as the first ringing tone.

When the resident who confirms the first or second call from the visitor by ringing the ringing tone (first ringing tone or re-ringing tone) picks up the handset 31 of the indoor master unit 2 and answers, From the parent device microphone and receiver through the hybrid circuit 32, the terminals T11 and T12, the transmission line L1, the terminals T1 and T2 of the entrance slave device 1, the hybrid circuit 20, the microphone amplifier 18 and the speaker amplifier 19, and A communication path for transmitting and receiving a voice signal is formed between the machine speakers 17, and a two-way communication between the resident and the visitor is established. When a call is established, the power supply multiplexing circuit 13 of the entrance device 1 superimposes (multiplexes) the DC voltage AC / DC converted by the power supply circuit 12 on the audio signal transmitted and received on the transmission line L1. Supply to indoor master unit 2. The power supply separation circuit 35 of the indoor master unit 2 separates the multiplexed DC voltage of the transmission line L1, the terminals T11 and T12 from the audio signal, and outputs a chime sound generation circuit 30, a hybrid circuit 32, a voltage detection circuit 33, and a master terminal. The power is supplied to each of the talk detection circuits 34 and used as an operation power supply when a call is established. Further, when the call is established, even if the call button 10 of the entrance cordless handset 1 is pressed by the visitor and the call switches 10a and 10b are turned on, the DC of the transmission line L1 is controlled by the control of the call detection circuit 11. The voltage potential is maintained.

When the occupant returns the handset 31 of the indoor master unit 2 to end the call with the visitor, when the operation is detected, the master unit end-of-call detection circuit 34 detects the operation and the power supply separation circuit 35.
To reduce the potential of the DC voltage on the transmission line L1. This potential drop is detected by the voltage detection circuit 21 of the entrance slave 1, and the voltage detection circuit
A pulse control signal is output to the base of the NPN transistor 22a, and the relay 22b is activated in a short time when the pulse control signal is at the high level. The activated relay 22b opens the relay switch 15 forming the relay disconnection circuit for a short time, and cuts off the supply of the AC voltage from the commercial power supply to the relay 14a forming the relay power supply circuit. As a result, the relay 14b is deactivated and the relay switches 14b and 14c are respectively opened, so that the room power supply line from the commercial power supply to the power supply circuit 12 is disconnected, and the intercom apparatus is restored to the standby state. .

[0029]

As is apparent from the above description, according to the door phone apparatus of the present invention, the power supply line for supplying commercial power to the indoor master unit via the transmission line by pressing the call button to the entrance slave unit. And a means for holding the same, and a means for disconnecting the power supply line when the call between the resident and the visitor is terminated, so that the intercom apparatus waits for a call from the visitor. The power consumption in the standby state is completely suppressed, and the economy can be improved by power saving. In addition, since the commercial power supplied to the indoor master unit via the entrance slave unit is multiplexed with the audio on the transmission line and supplied, the laying of strong electric wires as in the conventional example is not required, and this is necessary when laying wiring. Is eliminated.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a door phone device according to one embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a conventional door phone device.

[Explanation of symbols]

1 ··········································································································································································· or ··············· Application circuit (relay power supply circuit) ·················································································································································································································································· ... Power supply separation circuit L1 ... Transmission line

Claims (1)

[Claims] When a call button (10) is depressed, power is supplied from an entrance slave unit (1) to an indoor master unit (2) via a transmission path (L1), and the indoor master unit is transmitted from the entrance slave unit. A door phone device for calling and making a voice call between the entrance slave unit and the indoor master unit, wherein the entrance slave unit receives a power supply circuit (1
2) a power supply multiplexing circuit (1) for multiplexing and supplying the power from the power supply circuit to the audio on the transmission line.
3) and an application circuit (14a, 1a) for applying and holding the commercial power to the power supply circuit by pressing the call button.
4b, 14c), wherein the indoor master unit detects a master end call detection circuit (3
4) and separating the power multiplexed on the transmission path from the entrance slave unit from the voice and supplying the separated power to each unit of the indoor master unit, and detecting the end by the master unit end detection circuit. A power supply separation circuit (35) for changing a power supply voltage on a transmission line, wherein the entrance slave unit detects a call termination by a change in the power supply voltage on the transmission line when the call is terminated. When,
A door phone comprising: a disconnection circuit (15) for releasing the holding of the application circuit and disconnecting the supply of the commercial power when the end-of-slave call detection circuit detects the end of call. apparatus.