JPH0134418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intercom device, and more particularly to an intercom device with a monitor function.

Conventional intercom devices have been widely required to have a monitoring function, but when a general telephone type intercom device is on standby, the handset is off, making it impossible to monitor the voice of the called party. In addition, with telephone loudspeaker intercom equipment, it is possible to monitor by picking up the handset, selecting the station of the called party to be monitored, and putting the receiver in the receiving state. Furthermore, the intercom was used exclusively for the intercom during monitoring, making it impossible to make calls, which is its original function.

The present invention has been developed in view of the above-mentioned difficulties, and it is possible to monitor the voice of the called party without leaving the handset by using a loudspeaker, and it is also possible to receive a call from the other party's station and a call from your own station even while monitoring. The present invention aims to provide an intercom device with a monitoring function.

An embodiment of an intercom device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram in which the monitor function of the present invention is added to a conventional telephone loudspeaker intercom device. The intercom device includes a handset 1 consisting of a transmitter M and a receiver R, a loudspeaker microphone 2 and a loudspeaker 6,
One and the other first switch HS ₁ , HS ₁ ′ (hereinafter referred to as one first switch HS 1 and the other first switch HS ₁ ) are composed of normally open contacts that are closed when the handset 1 is lifted.
HS ₁ ′ is simply written as a switch HS ₁ and a switch HS ₁ ′, respectively. ). A loudspeaker amplifier 5 is provided which is operated by being supplied with power through the resistor _R2 , the switch _HS1 , and the line _l2 when the switch _HS1 is closed.
It is interlocked with the switch HS ₁ and HS ₁ ' to open and close in reverse, and is connected to the loudspeaker amplifier 5 and the loudspeaker 6.
A second hook switch HS ₂ (hereinafter simply referred to as hook switch HS ₂ ) consisting of a normally closed contact interposed between the two is provided.

Also, a first switching element Tr ₁ (hereinafter simply referred to as switching element Tr ₁ ) which short-circuits the terminals of the switch HS ₁ according to a monitor signal generated by operating the monitor key M when the switch HS ₁ is opened, and a transmitter. A second switching element Tr ₂ (hereinafter simply referred to as switching element Tr ₂ ) is provided which makes the loudspeaker microphone 2 inactive.

Furthermore, the switching element is activated according to the monitor signal.
The Tr ₁ is operated via the line L ₃ to emit the reception signal from the other station to the loudspeaker 6 via the loudspeaker amplifier 5, and the switching element
It has a control unit 7 that operates Tr ₂ via line l ₇ and deactivates the public address microphone 2 of its own station.

Further, power is applied to the collector of the switching element Tr ₂ and the loudspeaker microphone 2 via the resistor R ₁ . The power supply is connected to the collector of the switching element Tr ₁ and the switch HS ₁ through the resistor R ₂ ,
It is applied to the movable end of HS ₁ ′. The stator end of the switch HS ₁ is connected to the emitter of the switching element Tr ₁ , to the line l ₂ and to the lines l ₄ and l ₈ of the control section 7. The output of the loudspeaker microphone 2 is a capacitor C ₂ , a resistor R ₄ , a microphone amplifier 3,
The signal is applied to the loudspeaker amplifier 5 via the hybrid circuit 4. The handset M of handset 1 is a switch.
The fixed end of HS ₁ ' is connected to the input side of microphone amplifier 3 via capacitor C ₁ and resistor R ₃ . A line is connected between the output side of the microphone amplifier 3 and the input side of the hybrid circuit 4, which is a communication path with the other station.
l ₁ is drawn out.

A receiver R of the handset 1 is connected to the output side of the loudspeaker amplifier 5.

Further, a calling signal is inputted and outputted to the control section 7 via line _l5 , and when the calling signal is inputted from line _l5 , power is supplied to the loudspeaker amplifier 5 via line _l2 . When line l ₅ is empty, when a key signal from keyboard switch 8 is input to control unit 7 via line l ₆ , a call signal is sent to line l 6.
Output via _l5 .

In the intercom device configured as described above, when the switch HS ₁ is closed by lifting the handset 1, the transmission signal from the transmitter M of the handset 1 is transmitted to the capacitor C ₁ and the resistor.
It is amplified by the microphone amplifier ₃ via R3 and sent to the other station from the signal line _L1 . Also, the reception signal sent from the other party's signal line _l1 is sent to the hybrid circuit 4.
sent to. This hybrid circuit 4 distinguishes between the received signal sent from the other station and the transmitted signal from the own station, and the transmitted signal from the own station is transmitted to the receiver R of the handset 1.
We are easing the amount of money being sent to. The output of the hybrid circuit 4 is connected to the resistor R ₂ and the switch
Power is supplied through line HS ₁ and line l ₂ and sent to the operating loudspeaker amplifier 5 , and the output of the loudspeaker amplifier 5 is sent to the receiver R of the handset 1 . When the handset 1 is lifted, the switch HS ₂ is in the open state, so no sound is output from the loudspeaker 6, and when the handset 1 is put down, the received signal from the other station is emitted from the loudspeaker 6. urge Also,
Since switching element Tr ₁ is connected in parallel to switch HS ₁ , this switching element
When Tr ₁ is conducting, the switch HS ₁
Since the terminals of the resistor R2 and the element are shorted, even if the handset 1 is placed and the switch _HS1 is opened, the resistor _R2
It is possible to operate the loudspeaker amplifier 5 through Tr ₁ and line l ₂ . On the other hand, a switching element Tr ₂ that controls the loudspeaker microphone 2 for transmitting speech is connected in parallel to the loudspeaker microphone 2, and makes the loudspeaker microphone 2 inactive when the switching element Tr ₂ is in a conductive state. The control section 7 controls these switching elements Tr ₁ and Tr ₂ . In other words,
To monitor the other station, press keyboard switch 8.
By inputting the monitor signal generated by pressing the monitor key M to the control unit 7 via the line _l6 , the control unit 7 makes the switching element _Tr1 conductive and operates the public address amplifier 5. The switching element Tr ₂ is made conductive to de-energize the loudspeaker microphone 2, and a monitor state is created in which the loudspeaker 6 is made to emit the reception signal from the other station while the handset 1 is left in place. In the monitor state, the audio from microphone 2 of the other station is on line l ₁
It can be monitored via speaker 6. However, even if either the local station or the other party picks up the handset 1, the call cannot be made. Furthermore, if a station other than the partner station tunes in to either the own station or the partner station while in the monitor state, the monitor state is canceled.

The control of the control section 7 as described above is shown in the flowchart of FIG. As shown in the figure, it is determined whether or not the monitor is being monitored during the call, and if the call is not being monitored, the call is ended by putting down the handset 1, while the monitor key M on the keyboard switch 8 is pressed. As a result, a monitor signal is input to the control section 7, which makes the switching element _Tr1 conductive and turns off the switch.
The public address amplifier 5 is operated without detecting the opening of HS ₁ , and at the same time the switching element is activated.
Tr ₂ is rendered conductive, making the public address microphone 2 of the own station unusable. If the handset 1 is put down in this state, the system becomes amplified reception and becomes a monitor state.
Furthermore, when in this monitor state, it monitors whether or not other operations have occurred, that is, it monitors calls from the other station or calls from other stations from its own station, and if each call signal is received, the monitor state is activated. The call is canceled and the call is made, and the call mode is set.

As is clear from the above embodiments, according to the present invention, a telephone loudspeaker intercom device includes a pair of hook switches that open and close in reverse depending on the handset, a switching element that short-circuits one of the hook switches, and a loudspeaker microphone. By providing a switching element to control and a control section to control each switching element, the voice of the receiving party can be monitored using amplified sound using a loudspeaker, so the user does not need to be near the intercom device. Furthermore, the intercom function and the monitor function can be used freely because the monitoring function can be restored by a call from the other station during monitoring or by a call from the own station to the other station.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an intercom device with a monitor function according to the present invention, and FIG. 2 is a flowchart of control of the circuit shown in FIG. 1... Transceiver, 2... Public address microphone, 3... Microphone amplifier, 4... Hybrid circuit, 5... Public address amplifier, 6... Public address speaker, 7... Control section, 8... Keyboard switch, Tr ₁ , Tr ₂
...First and second switching elements, _l1 to _l8 ...
Signal line, HS ₁ , HS ₁ ′...first switch, HS ₂ ...second switch, M...monitor key.

Claims (1)

[Claims] 1 a handset 1, a loudspeaker microphone 2, a loudspeaker 6, a first hook switch HS ₁ that is closed by lifting the handset 1, and a first hook switch HS ₁ that is closed by closing the first hook switch HS 1. a loudspeaker amplifier 5 to which power is supplied through the loudspeaker ₁ ; and a second switch interposed between the loudspeaker amplifier 5 and the loudspeaker 6, interlocked to open and close the first switch _HS1 in reverse. and a first switching element Tr ₁ that shorts the terminals of the first switch HS ₁ and supplies power to the loudspeaker amplifier 5 when the first switch HS ₁ is opened, and a first switching element Tr ₁ that supplies power to the loudspeaker amplifier 5; a second switching element Tr ₂ that makes the loudspeaker microphone 2 inactive;
Then, by operating the monitor key M that sends out a monitor signal, the first switching element Tr ₁ is operated to output the signal to the loudspeaker 6 via the loudspeaker amplifier 5.
In addition to emitting the received signal from the other station,
operating the second switching element Tr ₂ to put the public address microphone 2 of the local station in an inoperable state, and
A control unit 7 that restores the monitoring state by operating the keyboard switch 8 and calling signals from the other station.
An intercom device with a monitor function, comprising: