JPS58143661A - Interphone device with monitor function - Google Patents

Abstract

PURPOSE:To monitor a voice of the incoming side with a handset hooked on and at the same time to answer the calls of the station of the remote side and the own station during monitor, by providing a switching element which controls a mike and a control part which controls the switching element and inactivates the mike. CONSTITUTION:An interphone device is provided with a transmitter 1, a loudspeaker mike 2 and a loudspeaker 6. A hook switch SH1 is closed by picking up the transmitter 1, and as a result a loudspeaker amplifier 5 is actuated. A hook switch SH2 is provided to the input stage of the speaker 6. The switch SH2 interlocks the switch SH1. The open/close of the SH2 is set adverse to that of the SH1. Furthermore switching elements Tr1 and Tr2 are provided to give a short circuit between terminals of the SH1 and to control the mike 2 respectively. Then the Tr1 is controlled in response to a monitor signal, and a receiving speech signal of the remote side station is delivered to the speaker 6 via the amplifier 5. At the same time, a control part 7 controls the Tr2 to inactivate the mike 2 of own station.

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 with general telephone-type intercom devices, when the handset is off, it is impossible to monitor the voice of the called party, and it is difficult to monitor the voice of the called party. With a type intercom device, it is possible to monitor by picking up the handset, selecting the station of the called party you want to monitor, and placing the call in the receiving state. However, in this case, the handset must be picked up at all times, and the monitored voice The problem was that the intercom could only be obtained from the receiver of the handset, and the intercom was exclusively used while 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. 17 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 handset M1, a handset R, a loudspeaker microphone 2, a loudspeaker 6, and a hook switch H81 and Hat' that are closed by lifting the handset 1. When the hook switch H8I is closed, the loudspeaker amplifier 5 is supplied with power through the resistor, the hook switch, and the line 12, and is operated. A hook switch H82 is provided which interlocks with the hook switch H81 to reversely open and close the hook switch H81 and is interposed at a stage before the input of the loudspeaker 6.

Further, a switching element Tri that short-circuits the terminals of the hook switch I (81) and a switching element Tr2 that controls the loudspeaker microphone 2 for transmitting speech are provided in response to a monitor signal when the hook switch H8I is opened.

Furthermore, the switching element Tr1
is controlled via line 1 to cause the loudspeaker to emit the reception signal from the other station via the public address amplifier 5, and the switching element Tr2 is controlled via line 17 to output the received signal from the other station to the loudspeaker via the public address amplifier 5. It has a control section 7 for deenergizing.

Further, power is applied to the collector of the element Tr2 and the microphone 2 via the resistor R2. The power supply is connected to the collector of the element Trl and the hook switch H81 via the resistor R2.
It is applied to the movable end of H81'.

The stator end of the hook switch H81 is connected to the emitter of the element Trl, the line 12 and the line 18 of the control section 7. The output of microphone 2 is capacitor C2, resistor R4, microphone amplifier 3, and hybrid circuit 4.
is applied to the amplifier 5 via. The transmitter M of the transmitter 1 connects the fixed end of the hook switch 11Sl' to the capacitor CI.
, are connected to the input side of the microphone amplifier 3 via a resistor R1.

A line l is drawn out between the output side of the microphone amplifier 3 and the input side of the hybrid circuit 4, which serves as a communication path with the other station.

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

The control section 7 also has a line 4. A call signal is input by line l, and keyboard switch 8 is input by line l.
key signal is input.

In the intercom device constructed in this way,
Hook switch H8 by lifting handset 1
1 is in the closed state, the transmission signal from the transmitter M of the handset 1 is amplified by the microphone amplifier 3 via the capacitor C2 and the resistor R3, and is sent to the other party's station from the signal line 11. Also, a reception signal sent from the other party's signal line l is sent to the hybrid circuit 4. This hybrid circuit 4
In this system, the reception signal sent from the other station and the transmission signal from the own station are distinguished, and the transmission of the transmission signal from the own station to the handset R of the handset 1 is alleviated. The output of the hybrid circuit 4 is connected to the resistor R2, the hook switch H81, and the line l.
! The power is supplied to the activated loudspeaker amplifier 5, and the output of the loudspeaker amplifier 5 is sent to the receiver R of the handset 1. When handset 1 is lifted, hook switch H
82 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 party's station is emitted from the loudspeaker 6. Since the switching element Tr1 is still connected in parallel to the hook switch H81, when this switching element Trl is in a conductive state, it shorts the terminals of the hook switch H81, so the handset 1 is placed and the hook switch H8I is opened. Even if this happens, it is possible to operate the loudspeaker amplifier 5 using the resistor R2, the element Tr1, and the line 12.

On the other hand, a switching element Tr2 that controls the loudspeaker microphone 2 for transmitting speech is connected in parallel to the loudspeaker microphone 2, and puts the loudspeaker microphone 2 in a non-operating state when the switching element Tr2 is in a conductive state.

The control section 7 controls these switching elements Tr.
1 and Tr2. That is, when monitoring a receiving station, a monitor signal generated by pressing the monitor key M on the keyboard switch 8 is inputted to the control section 7 via the line 16.
The switching element Trl is made conductive to operate the loudspeaker amplifier 5, and the switching element Tr2 is made conductive to de-energize the loudspeaker microphone 2. With the handset 1 left in place, the loudspeaker 6 receives the signal from the other station. It is in a monitor state where the received signal is emitted. Furthermore, if a calling signal from the other station or a calling signal from the own station is input from line 1 during monitoring, the control unit 7 turns off the switching elements Trl, Tr2 and the public address amplifier 5 to interrupt the monitoring state. , and controls the call mode.

The control by 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 of the keyboard switch 8 is pressed. As a result, a monitor signal is input to the control unit 7, which causes the switching element Tri to be in a conductive state so that the open state of the hook switch I (81) is not detected and the public address amplifier 5 is turned on.
is activated, and at the same time, the switching element Tr2 is rendered conductive, thereby disabling the public address microphone 2 of the own station. 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 there is any other operation, that is, it monitors calls from the other station or calls from other stations from its own station, and if there is a call signal, it changes the monitor state. Abort the call, change to talk mode and select [7].

As is clear from the above embodiment 5, 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, and a switching element that short-circuits one of the hook switches. By providing a switching element that controls a public address microphone and a control section that controls each switching element, the voice of the receiving party can be monitored using amplified sound using a loudspeaker. You don't have to be at the station, you can monitor with the handset still on, and even if you are monitoring, you can answer calls from the other station or from your own station, so you can use the intercom freely.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an intercom device with a monitoring function according to the present invention, and FIG. 2 is a control diagram of the circuit shown in FIG. 1...Transmitter/receiver 2...Publication microphone 3...Mic amplifier 4...Hybrid circuit 5...Publication amplifier 6... ... Loudspeaker 7 ... Middle control section 8 ... Keyboard switch Tri, Tr2 ... Switching element l, ~18
...Signal lines H8I, H8t', H82...
・Hook Switch Agent Patent Attorney Moritani -O

Claims (1)

[Claims] Handset (1), public address microphone (2) and public address speaker (
6), a hook switch (H81) that is closed by lifting the handset (1), and a hook switch (H81) that closes by lifting the handset (1);
The public address amplifier (5) operates via the hook switch when the hook switch (H81) is closed;
) and interlocked with the switch to open/close inversely to the loudspeaker (6) and interposed at the front stage of inputting the loudspeaker (6).
), a switching element (Tri) that short-circuits the terminals of the hook switch (H8I) when the hook switch (H81) is opened, and the loudspeaker microphone (2) for transmitting speech.
a switching element (Tr2) that controls the switching element (Tr2), and a switching element (Trl) that controls the switching element (Trl) according to a monitor signal to transmit a reception signal from the other station to the loudspeaker (6) via the loudspeaker amplifier (5). Along with emitting sound,
An intercom device with a monitor function, comprising: a control section (7) that controls the switching element (Tr2) to disable the loudspeaker microphone (2) of the local station.