JP2927046B2 - Door phone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus for connecting a plurality of intercom units to an intercom adapter and connecting the intercom adapter and a telephone with a modular connector or the like.

[0002]

2. Description of the Related Art FIG. 5 shows a configuration of a conventional door phone apparatus. In FIG. 5, A is a door phone adapter,
In the doorphone adapter A, 7 is a transmission amplifier, 8 is a reception amplifier, 9 is a hybrid circuit (HYB) for a doorphone, 10 is a CPU for detecting selection and reception of a doorphone, and 11 is a connection to the doorphone D1. Relay, 12
Is a relay for connection to the doorphone D2, 13 is a detection circuit for calling the doorphone, 108 is a power transformer for the doorphone adapter, and 14 is a regulator.

Reference numeral B denotes a telephone. In the telephone B, reference numeral 20 denotes a transmission amplifier, reference numeral 21 denotes a reception amplifier, reference numeral 22 denotes a speech network circuit, and reference numeral 27 denotes intercoms D1, D2.
When the telephone receiver is picked up within a certain period of time in response to a call signal from the telephone, the CPU has a function of outputting a selection signal of the intercom D1 or the intercom D2 to the intercom adapter A. 26 is a handset contact. 28 is a chime sound source and 126 is an amplifier for chime sound.

Next, the operation of the above configuration will be described. In FIG. 5, when the call button of the door phone D1 is pressed, the detection circuit 13 operates and outputs a signal to the CPU 10. CPU10
Detects an operation and outputs an H (high) level signal to the line. The CPU 27 detects the signal and outputs the chime sound source 2
8, the chime sound is amplified by the amplifier 126, and is transmitted from the speaker.

When the handset of the master unit is lifted within a predetermined time, the handset contact 26 is made up, and when the line is set to the H level by the CPU 27, the CPU 10 sets the line to the H level and the connection relay 11 is turned on. Subsequently, the contact a of the connection relay 11 is made, the hybrid circuit 9 is connected to the intercom D1, and the telephone and the intercom enter a talking state.

When the handset of the telephone is returned, the handset contact 26 breaks, the line goes low, and the line goes low. Then, the contact a of the connection relay 11 breaks, and the intercom call ends.

[0007]

However, the above-mentioned conventional intercom system has lines, lines, a large number of wires, and is not insulated. In this case, when the intercom line is aged and the wire is poorly insulated, there is a drawback in that when connected to a telephone, noise is superimposed on the telephone call on the central office or erroneous dialing occurs.

[0008] The present invention is to solve the above problems,
It is an object of the present invention to provide an excellent door phone apparatus in which insulation in wiring between a door phone adapter and a telephone is improved and the number of wires can be reduced.

It is another object of the present invention to provide an excellent intercom apparatus in which the insulation between the intercom adapter and the telephone is improved, the number of wirings can be reduced, and three or more intercoms can be easily connected. .

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention connects a ground of a telephone and a ground of an intercom adapter with a first line, and a second line connects the ground in the intercom adapter. Connected to a first transformer and a first photocoupler to transmit an AC signal when transmitting from a telephone and to transmit a call signal from a first door phone in a DC manner, and a third line is a door phone adapter. Connected to a second transformer and a second photocoupler, and transmits an AC signal at the time of reception from the first and second doorphones, and transmits a call signal from the second doorphone in a DC manner, Line 4 connects to the third and fourth photocouplers in the doorphone adapter to form a voltage identification circuit, and transmits a selection signal for the first or second doorphone by two types of voltages from the telephone. is there.

[0011] Further, the grounding of the telephone and the grounding of the doorphone adapter are connected by a first line, and the second line is connected to a first transformer and a first photocoupler in the doorphone adapter. And transmitting at least the first and second DC signals by command signals.
And a call signal for any of the third intercoms, wherein the third line is a second transformer in the intercom adapter,
Connected to a second photocoupler to transmit at least the reception from the first, second and third doorphones in an AC manner, and to DC-transmit at least one of the first, second and third doorphones by a command signal from a telephone. the Kano selection signal
To be transmitted .

[0012]

Therefore, according to the present invention, a transformer and a photocoupler are used to transmit an audio signal in an AC manner and a calling signal in a DC manner, and a selection signal of an intercom is transmitted by two photocouplers using two types of voltages. Because DC is controlled by turning on two or one,
In addition to connecting two doorphones, insulation in wiring between the doorphone adapter and the telephone is improved, and the number of wirings can be reduced.

[0013] Further, by using a transformer and a photocoupler to exchange audio signals and to select a call signal and a doorphone using commands, the doorphone can be connected by three lines as many as the number of commands, and the doorphone can be connected. The insulation in the wiring between the adapter and the telephone is improved, and the number of wirings can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the first embodiment.
Note that the same components as those in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, reference numeral A denotes a door phone adapter. In this door phone adapter A, reference numeral 1 denotes a door phone D.
In response to a call from 1, a photocoupler makes up while the intercom button is pressed, and 2 denotes a photocoupler to make up when intercom D2 is called. Reference numeral 3 denotes a photocoupler that is turned ON when the doorphone is selected, and reference numeral 4 denotes a photocoupler that is turned ON only when the doorphone D1 is selected.

Reference numeral 5 denotes a transmission isolating transformer, and reference numeral 6 denotes a telephone insulating transformer. Reference numeral 7 denotes a transmission amplifier, 8 denotes a reception amplifier, and 9 denotes a hybrid (HYB) circuit for supplying a DC voltage to a door phone. 10 is a door phone D1,
This is a CPU that sends a call signal of D2 to the photocouplers 1 and 2 and receives an intercom selection signal from the photocouplers 3 and 4 and controls relays. Reference numeral 11 denotes a relay for making a call with the intercom 1 during a call, and reference numeral 12 denotes a relay for making a call with the intercom D2. Reference numeral 13 denotes an intercom call detection circuit for transmitting intercom signals of the intercoms D1 and D2 to the CPU 10. Reference numeral 14 denotes a regulator for the doorphone adapter A.

In the telephone set B, reference numeral 20 denotes a doorphone transmission amplifier, and reference numeral 21 denotes a doorphone reception amplifier. 2
Reference numeral 2 denotes a speech network for transmitting and receiving voice signals of intercom transmission and reception to and from the handset, and reference numeral 23 denotes a voltage identification circuit for detecting an ON DC voltage of the photocoupler 2 in the intercom adapter. Reference numeral 24 denotes a voltage identification circuit for detecting the ON DC voltage of the photocoupler 1 . Numeral 26 denotes a hook switch contact of the receiver, and numeral 27 denotes when the doorphone D1 is selected.
Send an H level signal to 1 and select doorphone D2
The CPU transmits an H- level signal to 1010 and receives an intercom call signal input from the voltage identification circuit 23 and the voltage identification circuit 24 to activate the intercom chime sound source 28.

Next, the operation of the above embodiment will be described with reference to the timing chart of FIG. In (1) of FIG. 2, when there is a call from the doorphone D1, the doorphone call detection circuit 13 detects it and transmits it to the CPU 10, the level of the CPU 10 becomes H level, the photocoupler 1 is turned on, and the DC voltage of the line W1 becomes V1. → Descent to V2. With this drop, the telephone identification circuit 24 of the telephone B is detected, and 1013 becomes H level and C
The PU 27 detects that the doorphone D1 has been called, activates the chime sound oscillating circuit of the doorphone chime sound source 28, and the chime sounds from the speaker.

When the receiver is off-hook within a certain period of time, the hook switch contact 26 is made and the CPU 27
H is output to 11 and a voltage of 12 V is applied to the line W3. Then, the photocouplers 3 and 4 are turned on and the CPU 10
When the L level signal is input to the CPU, the H level signal is output to the CPU 10, and when the relay 11 is turned on, the contact a is made and a DC voltage is applied to the intercom via the hybrid circuit 9 and the intercom communication path is formed. Is done.

The telephone call from the telephone to the door phone is transmitted from the microphone of the receiver to the speech network 22, the door phone transmitter amplifier 20, the line W1, the transmitter isolation transformer 5, the transmitter amplifier 7, the hybrid circuit 9, and the door phone. Are output in order.

The reception can be heard from the microphone of the doorphone D1 through the hybrid circuit 9, the reception amplifier 8, the telephone isolation transformer 6, the line W2, the doorphone reception amplifier 21, the speech network 22, and the receiver in this order. .

When the receiver is hooked on, the hook switch contact 26 breaks, the line W3 becomes 0 V, the photocouplers 3, 4 are turned off, the output from the CPU 10 becomes L level, the relay 11 is turned off, and the contact a is expected to break. It becomes a state and the talk ends.

Calling, talking, and ending the intercom D2 are performed as shown in the timing chart of FIG.
5V is output to the line W3 as a selection signal of the doorphone D2, and only the photocoupler 3 is turned ON. Otherwise, the operation is the same as that of the door phone 1.

Next, a second embodiment will be described. FIG. 3 shows the configuration of the second embodiment. In the intercom adapter A, 1 is a photocoupler for intercom call transmission and transmission, 2 is a photocoupler for intercom reception and reception, 5 is an isolation transformer for transmission, 6 is an isolation transformer for reception, 7, 8 are amplifiers, and 9 is a hybrid circuit. , 10 detects the door phone call, intercom D1, D2, D3 by type of command data to e
Command data from the photocoupler 2 which can be transmitted to the photocoupler 1 and select any one of the doorphones D1, D2 and D3, and which can control the relay according to the signal. is there. 111 is a relay for connecting the doorphone D1, 112 is a relay for connecting the doorphone D2, 113 is a relay for connecting the doorphone D3, 1
3 is a CPU1 for calling signals of doorphones D1, D2 and D3.
A door phone call detection circuit for transmitting the signal to 0 is a regulator in the door phone adapter A.

In the telephone B, the doorphone transmission amplifier 20, the doorphone reception amplifier 21, the speech network 22, the voltage identification circuit 23, the hook switch contact 26,
The doorphone chime sound source 28 is a circuit similar to that of the first embodiment, and a current source 24 supplies a DC voltage to the line W2 in synchronization with a signal from the CPU 27.

The CPU 27 receives the command signal from the voltage discriminating circuit 23, detects which door phone has been called, and matches the called door phone in response to an input from the hook switch contact 26 within a certain period of time. It is a CPU that can send a door phone selection command.

Next, the operation of the second embodiment will be described.
FIG. 4 is a timing chart of the second embodiment, which will be described according to the timing chart. When there is a call from the doorphone D1 detected by the intercom call detection circuit 13, C
Feed <br/> and out through the door phone call command signal from the PUs 10. Then, the photocoupler 1 turns ON / OFF synchronously and sends out a DC voltage waveform of V1 / V2 to the line W1.

Next, the voltage identification circuit 23 receives the above-mentioned command and transmits it to the CPU 27. The CPU 27 transmits a start signal to the doorphone chime sound source 28, and a doorphone ringing sound called "ping pawn" is output from the speaker.

When the receiver is off-hook within a certain period of time, the hook switch contact 26 is made and the CPU 27 sends the door phone D1 selection command β to the current source 24 via the line W2.
Send to Therefore, the photocoupler 2 selects the doorphone D1.
When the CPU 10 detects the doorphone D1 selection command β and turns it into an H level signal in synchronization with the command β, the relay 111 is turned on and the contact a is made, so that the DC voltage and the communication path to the doorphone D1 are changed. Connected to

Transmission and reception of the telephone are performed using the lines W1 and W2 as in the first embodiment. Then you a handset
When the hook hooks, the hook switch contact 26 breaks,
The termination command γ is output from the CPU 27 to the line W2 via the current source 24, the command data is received by the CPU 10, the relay 111 is turned off to make the L level signal, and the contact a is broken, so that the standby state is established and the call is terminated. Becomes

Calling the doorphones D2 and D3,
Calls and call terminations are also implemented by commands as described above.

[0033]

According to the present invention, as is apparent from the above description,
Using a transformer and a photocoupler to transmit voice signals in an alternating manner and calling signals in a direct current, and use two photocouplers to select a doorphone signal and turn on two or one photocoupler with two different voltages. Therefore, two doorphones can be connected, and the insulation between the doorphone adapter and the telephone can be improved and the number of wirings can be reduced.

Further, by using a transformer and a photocoupler to alternately convert a voice signal and selecting a calling signal and a door phone by using a command, the door phone can be connected by three lines as many as the number of commands, and the door phone adapter can be connected. This has the effect of improving the insulation in the wiring between the telephone and the telephone and reducing the number of wirings.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a door phone device of the present invention.

FIG. 2 is a timing chart for explaining the operation of the first embodiment;

FIG. 3 is a configuration diagram showing a second embodiment.

FIG. 4 is a timing chart for explaining the operation of the second embodiment;

FIG. 5 is a configuration diagram of a conventional door phone device.

[Explanation of symbols]

 Reference Signs List A Doorphone adapter B Telephone 1, 2, 3, 4 Photocoupler 5, 6 Isolation transformer 7 Transmission amplifier 8 Receiver amplifier 9 Hybrid circuit 10 CPU 13 Doorphone call detection circuit 20 Doorphone transmission amplifier 21 Doorphone reception amplifier 22 Speech Network 23 Voltage identification circuit 27 CPU W1, W2, W3, W4 lines

Claims (2)

(57) [Claims] 1. A telephone, a doorphone adapter connected to the telephone via first, second, third and fourth wires, and first and second doorphones connected to the doorphone adapter, The first line connects the ground of the telephone and the ground of the doorphone adapter with the first line, and the second line connects to the first transformer and the first photocoupler in the doorphone adapter. And transmitting a call signal from the first intercom in a DC manner, and the third line is connected to a second transformer and a second photocoupler in the intercom adapter. Connected, transmits an AC signal at the time of reception from the first and second doorphones, and transmits a call signal from the second doorphone in a DC manner. The fourth line is connected to the inside of the doorphone adapter. Above A door phone device comprising a voltage identification circuit connected to third and fourth photocouplers to transmit a selection signal of the first or second door phone by two kinds of voltages from the telephone. 2. A telephone, a doorphone adapter connected to the telephone via first, second, and third wires, and at least first, second, and third doorphones connected to the doorphone adapter. The first line connects the ground of the telephone and the ground of the doorphone adapter with the first line, and the second line connects to the first transformer and the first photocoupler in the doorphone adapter. And transmits a call signal of any of the first, second, and third doorphones by a command signal in a DC manner, and the third line is connected to a third one in the doorphone adapter. 2 transformers, connected to a second photocoupler,
An intercom apparatus characterized in that a reception from the second and third intercoms is transmitted in an alternating manner and a direct current is used as a selection signal for selecting one of the first, second and third intercoms by a command signal from a telephone. .