JPH0774836A - Interphone device - Google Patents

Abstract

PURPOSE:To provide an interphone device which can decrease the number of wires between speaking devices. CONSTITUTION:The interphone device is constituted by connecting the speaking devices 20 and 21, equipped with transmitter receivers, to each other by a speaking line and each speaking device is provided with a transmitting means 24 which outputs a frequency signal (control signal) outside the voice band, a receiving means 25 which receives the control signal, an amplifying means 26 which amplifies a frequency signal (ringing tone) in the voice band received and loudens and outputs the voice only while the receiving means 25 receives the control signal; and a calling-side speaking device sends out the ringing tone and control signal to the speaking line at the same time at the time of calling operation. A called-side speaking device loudens and outputs the ringing tone only while the amplifying means 26 receives the control signal. The control signal is sent by the speaking line which is common to the ringing tone and a speech signal, so the number of wires between the speaking devices may be reducible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom device used for extension telephone calls in a house, and more particularly, it is configured to reduce the number of wires connecting the devices.

[0002]

2. Description of the Related Art In a conventional intercom system, as shown in FIG. 4, a sub-base unit 11 and an intercom slave unit 17 are connected to an intercom base unit 10. Intercom base unit 10 and sub-base unit 11 are each a call circuit that connects to the call line.
12, a call signal transmitting / receiving unit 13 for transmitting / receiving a call signal between the master unit and the sub-master unit through a control line, and an intercom slave unit
Built-in ringing tone sending unit 15 that outputs the ringing tone from 17 and the ringing tone between the master unit 10 and the sub-master unit 11 from the speaker,
The base unit 10 further includes a doorphone interface 14 connected to the doorphone slave unit 17, and a power supply unit 16 for supplying power to each block of the base unit 10, the doorphone slave unit 17 and the sub-base unit 11 through a power line. There is.

The base unit 10 and the sub base unit 11 are connected by two positive and negative power lines, a call line and a control line, and the negative line of the power line is the call line and the control line. It is shared by one of the pairs in the line, so the total number of wires is four.

In this interface device, the main unit 10
When calling the sub base unit 11 from, the call switch of the base unit 10 is pressed. By this operation, the calling signal transmitting / receiving unit 13 of the base unit 10
Sends to the control line a signal notifying that the sub-base unit 11 has been called.

When the signal transmission / reception unit 13 of the sub-base unit 11 receives the signal of the control line, the signal transmission / reception unit 13 notifies the ringing tone sending unit 15 of the ringing tone sending unit.
Reference numeral 15 outputs a ringing tone from the speaker to notify the called party that there is a call. If the called party answers,
The base unit 10 and the sub-base unit 11 are a communication circuit 12 of each unit,
A call is made through a call line connecting them.

[0006]

However, in the conventional intercom system, the communication devices must be wired by four lines, that is, a communication line, a control line and a power supply line, so that wiring cost is increased and wiring error occurs. There was a problem.

The present invention solves these conventional problems, and an object of the present invention is to provide an intercom system which is excellent in workability by reducing the number of wires between communication devices.

[0008]

Therefore, according to the present invention, in an intercom device in which communication devices having a handset are interconnected by a communication line, a transmission means for outputting a frequency signal outside a voice band to the communication device, Receiving means for receiving a frequency signal outside the voice band transmitted from another communication device, and amplifying and amplifying the voice band frequency signal received only while the receiving means is receiving the frequency signal outside this voice band. An amplifying means for outputting and a signal separating means for separating a frequency signal outside the voice band and a frequency signal within the voice band received from the same call line are provided, and when the calling side communication device makes a call operation, a ring tone and a voice The frequency signal outside the band is simultaneously transmitted to the communication line.

Further, the calling side communication device is
After the ringing tone is transmitted for a certain period of time, the voice input from the handset is transmitted to the communication line together with the frequency signal outside the voice band.

Further, the communication device is provided with an alarm sound transmitting means which is activated when an alarm switch is input. When the alarm sound transmitting means transmits an alarm sound to a communication line, the transmitting means transmits a frequency signal outside the voice band. Are simultaneously transmitted to the telephone line.

Further, each call device is provided with a call switch corresponding to each of the plurality of other call devices, and the transmitting means sends out a frequency signal outside the voice band in a pattern corresponding to the operated call switch, The receiving means is configured to recognize the pattern and receive the frequency signal outside the voice band.

Further, the call line is configured to be connected to the telephone through the call switching means for switching the connection from the telephone line to the call line in response to the reception of the frequency signal outside the voice band.

[0013]

Therefore, in the caller on the called side, the amplifying means outputs the frequency signal in the voice band, that is, the ringing sound, only while receiving the frequency signal outside the voice band.
The frequency signal outside the voice band functions as a control signal for the amplifying means, and this control signal is transmitted through the common communication line with the frequency signal in the voice band, so that the number of wires between the communication devices can be reduced. .

Further, when the call operation is performed, the voice input to the transmitter and the control signal are simultaneously transmitted, so that the voice call to the called party becomes possible.

Further, when the control signal is transmitted at the same time when the alarm sound is transmitted, it is possible to output the alarm sound from one communication device to another communication device.

Further, by assigning a control signal pattern to each communication device and allowing the receiving means to respond only to the control signal of the pattern allocated to itself, individual calling between communication devices becomes possible.

Further, by connecting the telephone to the interphone call line through the call switching means, it becomes possible for the telephone normally connected to the telephone line to talk with the intercom talk device when the control signal is received. .

[0018]

(First Embodiment) As shown in FIG. 1, the intercom device according to the first embodiment has an intercom base unit 20 to which an intercom slave unit 29 is connected, and between the base unit 20 and the sub-base unit 21. Is 2
Interconnected by book call lines. In this device, a frequency signal outside the voice band is used as a control signal, and the control signal and the voice signal in the voice band are transmitted and received through the same communication line. In addition, a power source is superimposed on this call line.

The master unit 20 and the sub-master unit 21 include a signal separating unit 23 for superposing / separating a voice signal, a control signal and a power source, a control signal transmitting unit 24 for outputting a control signal having a frequency outside the voice band, Control signal receiving unit 25 that receives this control signal
And a call circuit 22 connected to the handset, and an amplification circuit 26 that amplifies the signal in the voice band and outputs it from the speaker.The base unit 20 is connected to the intercom slave unit 29. An interface 27, a ringing sound source unit 30 that outputs a ringing tone, a power supply unit 28 that supplies the signal separating unit 23 with power to be superimposed on the call line, an alarm switch interface 32 that connects to an alarm switch, and an alarm sound. An alarm sound output circuit 31 for outputting is provided.

The operation of this intercom apparatus when there is a call from the intercom slave 29 will be described. The intercom interface 27 is an intercom slave 29
When an incoming call is detected, the control signal transmitter 24 is notified of that fact and the ringing tone generator 30 is activated. The control signal transmitter 24 sends a control signal out of the voice band to the signal separator 23 for a certain period of time, and at the same time, the ringing tone generator 30
A ringing tone from the intercom is sent to the signal separating unit 23. The signal separating unit 23 outputs the ringing tone and the control signal to the communication line.

The control signal separating unit 23 of the sub-base unit 21 separates the received signal into a signal having a frequency outside the voice band, that is, a control signal and a signal having a voice band frequency, that is, a ringing tone signal, and controls the signal. The signal is output to the control signal receiving unit 25, and the ringing tone is output to the communication circuit 22 and the amplification circuit 26.

The control signal receiving section 25 which has received the control signal is
While the control signal is being received, the amplifier circuit 26 is activated, and the activated amplifier circuit 26 outputs the ringing tone of the intercom sent through the signal separating unit 23 from the speaker and uses that there is a call. Notify the person. At this stage, since the handset is on-hook, the voice band signal sent to the call circuit 22 does not flow from the handset.

When the call switch of the base unit 20 is pressed, the control signal transmitting section 24 is activated, and at the same time, the ring tone generator 30 is activated by the signal of the control signal transmitting section 24 to transmit the control signal. A control signal outside the voice band is sent from the unit 24 for a certain period of time, and a ringing sound from the master unit is sent from the ringing sound source unit 30 to the signal separating unit 23, respectively, and the sub parent line is sent through the communication line. Transmitted to machine 21.

In the sub-master unit 21, when the control signal receiving unit 25 receives the control signal through the signal separating unit 23, as in the previous case, the amplifying circuit 26 is activated, and the amplifying circuit 26 causes the ringing sound from the master unit. Is output from the speaker.

When the called party answers the call, the voice signals input from the handsets of the master unit 20 and the sub-master unit 21 are transmitted to the other party through the telephone line, and the other party's master unit 20.
Alternatively, it is sent to the speech circuit 22 and the amplification circuit 26 by the signal separation unit 23 of the sub-master device 21. The voice signal sent to the call circuit 22 is subjected to signal processing there, and then sent to the handset, so that a call is made through the call line. At this stage, the amplifier circuit 26 is not activated, so that no sound is played from the speaker.

As described above, in the intercom device of the first embodiment, when the calling device on the calling side is called, the control signal of the frequency outside the voice band and the ringing tone are simultaneously sent to the calling line, and the called side. In the communication device, the amplification circuit is activated by the received control signal, and the ringing tone received at the same time is output in a loud voice. Therefore, a control line, which has been separately provided for a call operation, is no longer necessary, and a call between the communication devices can be performed with two wires.

(Second Embodiment) In the intercom apparatus of the second embodiment, in FIG.
While the call switch of the base unit 20 is being pressed, it is configured to continue outputting the control signal outside the voice band, and the ring tone generator 30 is configured to stop sending the ring tone at a fixed time. is doing.

In this device, when the caller continues to press the call switch, the control signal transmitting unit 24 continues to send the control signal, and in the receiving side communication device, the control signal receiving unit 25 receives the signal and amplifies the signal. The activation of circuit 26 continues. Therefore, the calling party can call the called party by using the handset of the transmitting side communication device while pressing the call switch even after the sending of the ringing tone is stopped. The voice signal of this interrogation is sent to the signal separation unit 23 of the receiving side communication device through the communication line, and the signal separation unit 23 outputs this to the amplification circuit 26 and the communication circuit 22, and the activated amplification circuit 26 This signal is amplified and output from the speaker.

As described above, the intercom system of the second embodiment has the function of voice calling, and the voice of the handset can be input from the handset while pressing the call switch at the time of calling to make the speaker of the called party's communication system. It is possible to output a loud sound from.

(Third Embodiment) In the third embodiment, the operation of the intercom apparatus shown in FIG. 1 when the alarm switch is pushed in the event of an emergency or the like will be described.

When the alarm switch is pressed, the alarm switch interface 32 that detects it is activated by the alarm sound output circuit.
31 and the control signal transmitter 24 are activated. Alarm sound output circuit 31
Sends a warning sound from the speaker through the amplifier circuit 26 in the base unit 20 and sends a warning sound to the call line through the signal separating unit 23, and at the same time, the control signal sending unit 24 sends the control signal outside the voice band to the call line. Send to.

As in the first embodiment, the sub-master unit 21 outputs the alarm sound from the master unit transmitted via the telephone line from the speaker to notify the user of the alarm occurrence.

As described above, the intercom system shown in FIG.
A function that, when an alarm is input, a frequency signal outside the voice band and an alarm sound from the alarm sound output circuit 31 are sent to the call line at the same time, and an alarm sound is output from the communication device installed in another room. Have.

(Fourth Embodiment) As shown in FIG. 2A, the intercom device of the fourth embodiment is an intercom master unit 33.
2 and the sub-base stations 34 and 35 respectively have two call switches corresponding to the other two communication devices, and when these call switches are pressed, the control signal transmission unit 24 causes the control signal transmitter 24 to operate as shown in FIG.
As shown in (b), a control signal of a frequency outside the voice band having a different pattern is output for each call switch. Further, the control signal receiving section 25 has a function of recognizing the pattern of the received control signal.

In this intercom system, when calling the first sub-base unit 34 from the base unit 33, the first sub-base unit built in the base unit 33 is used.
Push down the call switch corresponding to 34. When the call switch is pressed, the control signal of the first sub-master call pattern shown in FIG. 2B is output from the control signal transmission unit 24, and the call sound output from the call sound source unit 30 is transmitted to the call line. Sent out.

In the first sub-master unit 34, the control signal receiving unit 25
Recognizing that the control signal pattern is addressed to the own device, the amplifier circuit 26 is operated to output the ringing sound from the speaker. On the other hand, in the second sub-master device 35, the control signal receiving unit 25 recognizes that the control signal pattern is not addressed to the own device, and does not activate the amplification circuit 26.

As described above, in the intercom apparatus of the fourth embodiment, by providing the receiving circuit for recognizing the pattern of the frequency signal outside the voice band, each calling apparatus can be arbitrarily called individually.

(Fifth Embodiment) The intercom apparatus of the fifth embodiment is configured such that a single telephone is connected to a call line via an adapter and can be used as an intercom communication apparatus. This single telephone adapter is, as shown in FIG. 3, connected to a telephone call switching unit 41 that switches the connection of the single telephone 40 to a telephone line or an intercom call line, an incoming call timer 42 that measures the time from an incoming call, and an intercom call line. A signal separating unit 43 for separating a call signal, a control signal and a power source, an amplifier circuit 46 for amplifying a frequency signal in a voice band and outputting it from a speaker, and a control signal for receiving the control signal and activating the amplifier circuit 46. And a receiver 44.

In this device, the call switching unit 41 normally connects the single telephone 40 to the telephone line. When there is an incoming call from the intercom slave or other communication device, the control signal receiving unit 44 receives the control signal outside the voice band through the signal separating unit 43.
Activates the incoming call timer 42 and the amplification circuit 46.

The amplification circuit 46 outputs the ringing tone transmitted through the intercom communication line from the speaker. Further, the incoming call timer 42 measures the time until the preset valid incoming call time is reached, and during that time, the call switching unit 41 connects the single telephone 40 to the intercom call line to set the single telephone 40.
Allow incoming calls to be answered. When the effective time of the incoming call expires without the independent telephone 40 answering, the incoming call timer 42
The call switching unit 41 notified by the
Switch the connection of to the telephone line. Further, when the single telephone 40 responds within the valid incoming time, the call switching unit 41 maintains the connection between the single telephone 41 and the intercom communication path until the call ends.

As described above, in the device of the fifth embodiment, the voice frequency signal transmitted on the intercom call line is amplified and output to call, and the call switching unit 41 connects the single telephone to the interphone call line side. By switching to, it becomes possible to make an intercom call with the single telephone 40.

In each of the embodiments, the case where the number of wires between the communication devices is two has been described. However, by providing a communication line and a power supply line separately and sharing one of them,
The number of wires can be set to three in total. In any case, in the intercom apparatus of the present invention, since the control signal and the voice signal are transmitted on the common line, the number of wires is reduced as compared with the conventional one.

[0043]

As is apparent from the above description of the embodiments, in the intercom apparatus of the present invention, the number of wires between the communication devices can be reduced, which simplifies the wiring work and may cause miswiring. Decrease.

In this device, the called party can be called by using the transmitter and the individual calling devices can be called individually.
An alarm sound can be generated from each communication device, or a telephone can be used as an intercom device by attaching an adapter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an intercom apparatus according to an embodiment of the present invention,

FIG. 2 is a diagram showing a configuration (a) and a control signal pattern (b) of a master / sub-master unit of a fourth embodiment,

FIG. 3 is a block diagram showing the configuration of a single telephone adapter connected to a telephone line in the intercom system of the fifth embodiment;

FIG. 4 is a block diagram showing a configuration of a conventional intercom apparatus.

[Explanation of symbols]

 10, 20, 33 Base unit 11, 21, 34, 35 Sub-base unit 17, 29 Doorphone slave unit 12, 22 Call circuit 13 Ringing signal transmitting / receiving unit 14, 27 Doorphone 1 / F 15 Ringing tone sending unit 16, 28 Power supply unit 23, 43 Signal separating unit 24 Control signal transmitting unit 25, 44 Control signal receiving unit 26, 46 Amplifying circuit 31 Alarm sound output circuit 32 Alarm switch 1 / F 40 Single telephone 41 Call switching unit 42 Incoming timer 45 Single telephone adapter

Claims (5)

[Claims] 1. An intercom device in which a communication device having a handset is interconnected by a communication line, wherein the communication device outputs a frequency signal outside a voice band to the communication device, and the communication device transmits from another communication device. The same receiving means for receiving the frequency signal outside the voice band and the amplifying means for amplifying and outputting the amplified voice frequency signal only while the receiving means is receiving the frequency signal outside the voice band A signal separating means for separating the frequency signal outside the voice band and the frequency signal within the voice band received from the call line of
An intercom device, wherein a ringing tone and a frequency signal outside the voice band are simultaneously transmitted to the communication line. 2. The calling communication device transmits the ringing tone for a certain period of time during the call operation, and then transmits the voice input from the handset to the communication line together with a frequency signal outside the voice band. The intercom device according to claim 1, wherein 3. The communication device is provided with an alarm sound transmitting means which is activated when an alarm switch is input, and when the alarm sound transmitting means transmits an alarm sound to the communication line, the transmitting means causes the voice band to be transmitted. The intercom device according to claim 1, wherein the intercom device is configured to simultaneously send an external frequency signal to the communication line. 4. The calling device is provided with a paging switch corresponding to each of a plurality of other calling devices, and the transmitting means comprises:
The frequency signal outside the voice band having a pattern corresponding to the operated call switch is transmitted, and the receiving means recognizes the pattern and receives the frequency signal outside the voice band. The intercom device according to any one of 1 to 3. 5. The telephone call line is connected to a telephone through a telephone call switching means for switching the telephone line to the telephone call line in response to reception of a frequency signal outside the voice band. The intercom device according to 1.