JPH0566781B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention allows ringing tones to be heard from both a speaker provided on the base unit and an additional speaker provided separately by operating a ring switch provided on the slave unit. The present invention relates to an intercom device with a so-called additional speaker that is configured to be able to do so.

Conventional configurations and their problems Intercom devices with additional speakers are generally known, but in all of these types of devices, a ring tone generation circuit that operates by operating a ring switch provided on the handset side is connected to the base unit. This device simply connects the speaker on the base unit and the additional speaker installed separately to the output side of the ring tone generation circuit installed on the base unit. It was just something that could be detected simultaneously on both the base unit and the additional speakers. That is, with this type of intercom device that has been used in the past, it has not been possible to call the additional speaker side from the base unit side, and the intercom device as a whole has not necessarily had sufficient functionality.

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide an excellent intercom device with an additional speaker that can call the additional speaker from the base unit with a simple configuration. This is the purpose.

Structure of the Invention The present invention is configured so that the ring tone generation circuit provided on the base unit operates when either a ring switch provided on the slave unit or a ring switch provided on the base unit is operated. A predetermined ringing tone is output from an additional speaker connected to the output side of the ringing tone generating circuit in response to both a call from the slave unit and a call from the base unit.

Description of Embodiment The figure is a schematic configuration diagram of an embodiment of the intercom device with an additional speaker of the present invention, and in the figure, 1
2 is the main unit, 2 is the slave unit, 3 is an additional speaker, 4 is a ringing tone generating circuit provided in the main unit 1, and 5 is an additional speaker drive connected to the output side of the ringing tone generating circuit 4. Amplification circuit, 6 is a transistor for controlling the call of the additional speaker, 7 is a current limiting resistor connected in series with the transistor 6, 8 is the main unit main body 1
Switch for calling the additional speaker installed in 9
1 is a detection circuit for detecting whether or not a handset 15 has been picked up, which will be described later; 10 is a relay control circuit operated by the voltage applied to the first control terminal a of the ringer generating circuit 4; and 11 is a current limiting circuit. resistance, 12 is a transistor for relay control, 13
is a relay connected in series with transistor 12,
14 is operated by the relay 13 whose one fixed terminal a is connected to the second control terminal b of the ringing tone generating circuit 4, and whose other fixed terminal b is connected to the input/output terminal 18 of the main unit body 1. A relay contact 15 indicates a handset 1 which constitutes a base unit together with the base unit body 1.
Reference numeral 6 denotes a transistor that is turned on when the hook switch 17 provided in the handset 15 is turned on; 19 is a communication circuit provided in the handset 15; 20 is a call switch provided in the handset 2;
21 is a call speaker provided in the handset 2;
2 is a capacitor connected in parallel to the call switch 20 for forming a communication path.

Incidentally, when a high level voltage is applied to the first control terminal a, the ring tone generation circuit 4 generates a first ring tone, for example, a continuous tone such as "beep", and a low level voltage is applied to the second control terminal b. is configured to generate a second ringing tone, for example, a ringing tone of "ping pong" when a voltage of . Further, although not shown, a microphone for transmitting and a speaker for receiving calls are built into the handset 15, and these are each connected to a communication circuit 19. A switch 17 provided within the handset 15 is configured to be turned on when the handset 15 is lifted up.

In the above embodiment, in the normal state, the handset 15 is placed on the main body 1, and the switch 17 is in the off state. Therefore,
No DC voltage is applied to the input/output terminal 18 of the main unit 1. Therefore, in this state, the transistor 12 is off, the relay 13 is inactive, and its contact 14 is connected to one fixed terminal a. In this state, the detection circuit 9 is also inactive, and the transistor 6 is also turned off. Therefore, even if the ringing switch 8 provided on the main unit side is turned on in this state, the ringing tone generating circuit 4
doesn't work at all.

Now, in the above state, call switch 2 installed on handset 2
0 is turned on, the second ring tone generating circuit 4
Control terminal b is relay contact 14, call switch 2
DC grounded via 0. Therefore, the second control terminal b of the ringing tone generation circuit 4 becomes low level in terms of direct current, and the second ringing tone is outputted from the ringing tone generation circuit 4. When the second ringing tone is output from the ringing tone generating circuit 4, it is applied to the handset 15 via the input/output terminal 18 and also to the additional speaker 3 via the amplifier circuit 5. Therefore, in this state, the speaker in the handset 15 and the additional speaker 3 operate together, and a call from the handset 2 can be detected at the position where each speaker is installed.

Next, assume that the handset 15 is lifted up in this state. When the handset 15 is lifted, the switch 17 is turned on, so the transistor 16 is turned on, and a high-level DC voltage is applied to the input/output terminal 18 of the main body 1. Therefore,
In this state, transistor 12 turns on, and relay 1
3 is activated and the relay contact 14 is connected to the other fixed terminal b.
It is thrown into the side. When the relay contact 14 is connected to the other fixed terminal b side, the handset 2 and the handset 1
A communication path is established between the two parties, and communication becomes possible between the two parties. In this state, the detection circuit 9
also enters the operating state, and the transistor 6 becomes in a state where it can be turned on.

Now, when the ringing switch 8 provided on the main body 1 is turned on, the transistor 6 is turned on, and a high level DC voltage is applied to the first control terminal a of the ringing tone generating circuit 4. Therefore, the ringing tone generation circuit 4 operates with the above-mentioned high level DC voltage and outputs the first ringing tone to the output terminal. Therefore, in this case, the first ring tone is emitted from the speaker in the handset 15 and the additional speaker 3, respectively.
In this case, when the transistor 6 is turned on, a high level DC voltage is simultaneously applied to the relay control circuit 10, so even if the transistor 12 is turned on by the DC voltage from the transistor 16, it is forcibly turned off. I am made to do so. Therefore, in this case, the relay 13 becomes inactive, its contact 14 is connected to one fixed terminal a side, and the slave unit 2
The communication path between the terminal and the handset 15 is cut off.

In this way, according to the above embodiment, when the call switch 2 provided on the handset 2 is turned on, the handset 1
Speaker installed in 5, additional speaker 3 installed separately
Not only can the ringing tone be emitted from both speakers, but also when the ringing switch 8 provided on the base unit body 1 is turned on while the handset 15 is lifted, the ringing tone can be emitted from both of the speakers. Therefore, for example, if the handset 2 is installed outdoors such as at the entrance, the main unit 1 is installed indoors on the first floor, and the additional speaker 3 is installed indoors on the second floor, when a call from the handset 2 is received, the main unit The first side can respond and then the additional speaker 3 side can be called, which is extremely advantageous in practice. Further, according to the above embodiment, when calling the additional speaker 3 from the base unit side, the slave unit 2
Since the communication path between the base unit and the base unit is temporarily disconnected, no ringing tone is sent to the slave unit 2 side, and there is an advantage that only the so-called additional speaker 3 can be called independently.

Effects of the Invention As is clear from the above embodiments, the intercom device of the present invention operates by operating a ring switch provided on the handset to operate the ringing tone generation circuit on the base unit side, by lifting up the handset on the base unit side, and It also operates when the call switch installed on the base unit is operated, and when these call switches are operated, a ring tone is emitted from both the speaker installed on the base unit and the additional speaker installed separately. With this structure, not only calls from the slave unit but also calls from the base unit can be easily sensed by the separately provided additional speaker, which is extremely advantageous in practice. In particular, according to the present invention, a call from the base unit is configured so that it will not work unless the handset is lifted and the call switch is operated, thus preventing unnecessary calls by mistake. It has the advantage of being able to

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of an embodiment of an intercom device with an additional speaker according to the present invention. 1...Base unit, 2...Slave unit, 3...Additional speaker, 4...Ring tone generation circuit, 5...Amplification circuit,
6, 12, 16...transistor, 7, 11...
Resistor, 8, 20... Call switch, 9... Detection circuit, 10... Relay control circuit, 13... Relay,
14...Relay contact, 15...Handset, 1
7...Hook switch, 18...Input/output terminal, 1
9...Telephone circuit.

Claims (1)

[Claims] 1. A ring tone generation circuit that is operated by the operation of a ring switch provided on the slave device is provided on the base device side, and a speaker on the base device side is connected to the output side of this ring tone generation circuit, respectively.
By connecting a separately provided speaker and operating the call switch provided on the handset, a ring tone is output from each of the speakers, and a call switch is further provided on the base unit, By operating the ringing switch on the base unit side while the handset is lifted up, the ringing tone generation circuit is activated, and in this case also, the ringing tone is output from each of the speakers. Intercom device with speaker.