JPS59122067A - Interphone - Google Patents

Abstract

PURPOSE:To facilitate operation by outputting a ring-back tone when a handset is taken off the hook. CONSTITUTION:When the handset 7 of a telephone set A 51 is lifted, a switch 13 is placed on the side of a contact 13a and a ring-back tone signal generating circuit 16 oscillates to transmits its output signal to a telephone set B 52 through a connection cord 9. Then when the handset 7 of the set 52 is lifted, the circuit 16 stops and a switch circuit 19 turns to allow the telephone service between the both. If the handset 7 of the set 52 is put on the hook regardless of the subscriber of the set 51 wants to continue the call, the subscriber of the set 51 calls out the opposite subscriber through the handset 7a and the voice is transmitted to the handset 7b of the set 52, thus carrying on the talk with the side of the set 52.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intercom used for making calls between rooms that are separated from each other, or between rooms and entrances.

The purpose of this is that when one party wants to make a call to the other party, they can call the other party by simply raising the handset, and furthermore, when one party is about to talk, the other party takes down the handset. Even if you do, one of the above is part 1.
The purpose is to provide an intercom that allows you to call another party simply by calling the other party using your voice.

The drawings showing the embodiments of the present application will be described below.

In FIGS. 1 to 5, ■ indicates one room, 2 indicates the other room, and 3 indicates a wall existing between the two rooms. Note that the one room and the other room may be an entrance or the like. Reference numerals 51952 and 51952 respectively indicate intercoms, and both have the same configuration. Hereinafter, in this specification, if necessary, 51 will be referred to as a medium machine and 52 will be referred to as a 6 machine to distinguish between the two. In the intercom described above, 6 indicates a main body, and the intercom circuit is housed inside a case made of a synthetic resin material. Reference numeral 7 denotes a handset, which includes a transmitter 7a and a receiver 7b, and is connected to the main body 6 by a connecting cord 8 (a curl cord is used as an example). A connection cord 9 connects the middle machine 51 and the sixth machine 52, most of which is buried in the wall of the building. Reference numeral 10 denotes an operation piece of a changeover switch, a part of which is protruded from the outside of the main body 6, and the transmitter/receiver 7 is mounted on the main body 6.
This operating piece 10 is provided to be operated.

Next, in the intercom circuit mainly shown in Fig.
11 is a control signal sending circuit, and 11a and 11b indicate its two output terminals. 12 is an oscillation circuit, for example -3
It is designed to oscillate a signal of about 00■Z. I
3 is a changeover switch, which has two contacts 13a and 13b and is connected to the operation piece 10. 14 is a detection circuit, and 14a and 14b indicate an input end and an output end, respectively.

15 is a control circuit with two input terminals 15a, 15
B and one output terminal 15C, and as shown in FIG. 6, well-known logic circuit elements are illustrated with MIL symbols, and resistors and capacitors are illustrated with JIS electrical diagram symbols, respectively. It is connected and configured as follows. The control circuit shown in FIG. 6 operates as shown in Table 7, that is, each point P1 inside the circuit is controlled according to the state of each of the first input terminal 15a1 and the second input terminal 15b. -P7 operate so that the states shown in Table 1 are obtained.

Reference numeral 16 denotes a ringing signal generation circuit, which uses an oscillation circuit that generates a ringing signal such as a well-known "jirpururu" or "ping-pong" force.When the state of the control terminal 16a becomes H, it oscillates and becomes L. The structure is such that the oscillation stops when this occurs. 17 indicates a well-known detection circuit, and 17 indicates an inverting circuit, respectively.
19 is a switch circuit, when the signal state of the control terminal 19a becomes ■, the connection between the input terminal 19b and the output terminal If) is cut off, and when the control terminal +9a becomes the L state. , so that the input terminal 19b and the output terminal 19C are electrically connected.

Note that this switch circuit I9 is a circuit such as a transistor.
It can be configured using a five-element relay.

Next, the operation of the above earphone will be explained based on the following Table 2 (Part 2).

First, as shown in FIG. 7, the middle machine 51. When the transmitter/receiver 7 of the second machine 52 is not raised (that is, the standby state), the states of each member in the circuit are as shown in A of Table 2.

That is, the transmitter/receiver 7 has been lowered, the selector switch 13 has been switched to the 13b side, and there is no input to the detection circuit 14, and its output is in the L state. Further, in the control circuit L5, the first input terminal (indicated by /) is in the H1 state, the second input terminal (indicated by 2) is in the L state, and the output terminal 15
e is in the L state. Due to this, the ringing signal generation circuit 16 is in a stopped state. Furthermore, there is no input to the detection circuit 17, and the output of the inverting circuit is constantly in the H state. Further, as a result, the switch circuit 19 is in a cut-off state. Further, the transmitter 7a has no audio input, and the receiver 7b has no audio output.

Next, when the transmitter/receiver 7 of the intermediate machine 51 is picked up as shown in FIG. 2, each member is in the state shown in Table 2B. That is, the switch sleeve in the intermediate machine 51 is the contact point t3a.
In order to switch to the side, the signal from the oscillation circuit is applied to the detection circuit 14, and its output becomes ■. As a result, the output of the υ control circuit L5 also becomes ■, and the ringing tone signal generation circuit 16 oscillates. The output signal (ringing tone signal) of this ringing tone signal generation circuit 16 is transmitted to the six aircraft 52 via the connection cord 9. Then, the signal is applied to the six detection circuits 17 to generate an output from the detection circuit 17, and the output for the inverting circuit becomes L.

As a result, the switch circuit 19 of the second machine becomes conductive, and the ring tone signal is transmitted to the receiver 7b of the six machines via this switch circuit 19. Therefore, a ringing tone is emitted from the receiver 7b. In this case, as is clear from the circuit diagram, the output signal of the oscillation circuit 12 of the middle machine also flows to the six handsets 7b, but the output level of the oscillation circuit must be kept low or the frequency of the oscillation signal should be adjusted appropriately. Select (
For example, by selecting a low frequency such as the above-mentioned 3θθHz that is unlikely to flow out from the handset 7b, the presence of the signal can be made substantially non-problematic.

Next, when the six transceivers 7 are picked up as shown in FIG. 3, each circuit element is in the state shown in C of Table 2. That is, the signal from the oscillation circuit of the sixth machine 52 is transmitted to the middle machine 5.
1 to the detection circuit 17, and as a result,
The first input terminal 15a of the intermediate machine 51 becomes L, the output terminal 15c thereof becomes L, the ringing tone signal generating circuit 16 stops, and the switch circuit 19 becomes conductive. In this state, the transmitter 7a of the intermediate aircraft 51
The audio signal sent to the receiver 7b of the sixth aircraft 52 flows out from the receiver 7b of the sixth aircraft 52, and the audio signal sent to the receiver 7a of the sixth aircraft 52 flows out from the receiver 7b of the middle aircraft 51.

This allows both parties to communicate with each other.

Next, when the conversation is over and the handsets of the six aircraft 52 are unloaded, each member in the circuit is in the state shown in the second table.

In this state, the switch circuit 19 of the sixth plane 52 is still in a conductive state.For example, if there is a conversation from the middle plane 51, but only one transceiver 7 of the fourth plane 52 is taken down. As shown in FIG. Receiving a call? A voice saying "Oi" comes out from s7b. This allows the users of the six machines to be summoned again. Then, when the handset 7 of the six machines 52 is picked up again, the state of the circuit is as shown in Table 2 C, and two-way communication is possible again.

Next, after the transmitter/receiver 7 of the six aircraft 52 is lowered as described above, when the transmitter/receiver of the middle aircraft 5I is lowered, the state of each part of the circuit is as shown in Table 2 E, that is, the state of the above A. The state will be exactly the same as in the previous case, and the device will go back to standby mode.

As mentioned above, the Kotobuki, mid-sized aircraft, and 6 aircraft are configured in exactly the same way, so when calling the middle aircraft from the 6th aircraft side, the middle aircraft and the 6 aircraft in Table 2 above must be interchanged. Just understand. The operation status of the middle aircraft and the operation status of the 6th aircraft when the middle aircraft's transmitter/receiver 7 is lowered first after two-way communication is shown in Table 2. You can understand this by replacing them with each other. Therefore, in this case, if it is still necessary to make a call from the 6th aircraft side after the middle aircraft's handset 7 has been lowered, by calling from the 6th aircraft side in the same way as in the above case, You can call the medium machine again.

Next, FIG. 7, which shows a different embodiment of the present application, will be described. This figure shows a different example of the control signal sending circuit, and in the figure, 21 is a signal source (for example, a positive DC power supply) of the ■ signal.

In such a configuration, when the switch 13e is switched to the contact 13ae side, the oscillation circuit P2e
When the KL signal is added, this oscillation circuit 12e oscillates,
The oscillation signal is outputted from the output terminal 11ae, and
The ■ signal of the signal source 21 is output from the output terminal 11 b e. Further, when the switch 13e is switched to the contact 1.3be side, the oscillation circuit 12e stops operating, and an L signal is output from the output terminal ube.

In addition, the parts that are considered to have the same or equivalent structure as those in the previous figure in terms of function are given the same reference numerals as those on the front side with the letter e, and redundant explanations are omitted. (Also, in the next period and onward, the same idea applies to alpha vent f,,g
are attached in order and redundant explanations will be omitted. ) Next, Fig. g shows a further different embodiment of the present invention, in which it is possible to connect the middle and six machines with each other using seven connection cords, and the size of the audio signal flowing from the receiver can be controlled. This shows an example in which switching is possible depending on the state.

In the figure, the phantom is an oscillation circuit used in place of the oscillation circuit, and the frequency is significantly higher than that in the previous case (for example, 1
It is designed to oscillate a signal from 0kk to ≠5θ music). Sae is a modulation circuit, and is configured to modulate the signal from the oscillation circuit array as a carrier wave with a ringing tone signal or a voice signal from a transmitter. The group is an amplifier circuit for amplifying audio signals, which is used as necessary. In addition, a switch circuit is constructed so that the input terminal 26b and the output terminal 26e are brought into a disconnected state and a conductive state, respectively, according to the signal (1) or FiL applied to the control terminal 26a.

I is a hybrid circuit, with three terminals'; im, 27b
.

27C, and is constructed in a well-known manner so that signals can be transmitted between these terminals only in the direction shown by the arrow. An example of this is the hybrid coil (
A three-winding transformer) is used. The circuit is used as needed in the amplifier circuit.

Reference numeral denotes a demodulation circuit, which is provided correspondingly to each of the modulation circuits, and is used to demodulate the modulation signal sent from another intercom and extract the voice signal or ring tone signal. . 30a and 3ob each indicate an attenuation circuit, and the attenuation amount of the attenuation circuit 30B is set to a larger value than the attenuation amount of the attenuation circuit 30b. 3] is a switch,
It is configured to be interlocked with the operation piece 1of.

In such a configuration, the transmitter/receiver 7f is connected to the main body 6.
When picking up voice signal f and talking to each other, the switch 31 is switched to the contact point 3], a, so that an attenuation circuit 3Qa with a large amount of attenuation intervenes in the audio signal transmission path.

Therefore, the receiver 7bf outputs sound at an appropriate volume that is suitable for listening by placing one's ear against the receiver 7bf. On the other hand, when the handset 7f is lowered onto the main body 6f and a ringing signal or a re-ringing voice from one side as described above is sent, the switch 31 closes the contact 31b.
Since the attenuation circuit 30b with a small amount of attenuation (even zero) intervenes in the signal transmission path, the ringing tone signal or audio signal is output from the receiver 7bf with a loud sound ft.

Next, FIG. 9 shows a further different embodiment of the present invention, in which indoor wiring (light lines) strung indoors is used to make it possible to communicate with each other using an intercom. be. In the figure, reference numeral 35 indicates indoor wiring, and as is well known, outlet sockets are provided at various locations on the indoor wiring. 368 is a well-known plug, a is a transmitting side interface, (a is a receiving side interface, and each is composed of an isolation transformer, a capacitor, etc., and is configured to not pass commercial alternating current signals but to pass the modulated signal. 39° and 40 each have one end connected to the interface place and 38, and the other end of the filter string is connected to the above-mentioned variable W, ■ circuit U, and the other end of the filter 40 is connected to the above-mentioned amplifier circuit. The above bandpass filters pass only the modulation signal of the own machine, and the filters pass only the modulation signals of other machines. In this example, the oscillation frequencies of the oscillation circuit zag are made to be different between the middle machine and the fourth machine.

With this configuration, the modulated signal from one intercom collar passes through the bandpass filter blade and the interface, and is transmitted from the plug 36B inserted into the outlet 1-36 to the indoor wiring. and sent to another aircraft. For other machines, outlet 1
The modulated signal is taken in through the 1 plug 36 a , the interface blade, and the filter cutter 7 .

With such a configuration, by bringing the intercom into any room and inserting the plug 36a into the electrical outlet (36) in that room, you can connect any room with an electrical outlet (36) installed. You can also make calls.

As described above, in this invention, by simply picking up the handset 7 from the main body 6, it is possible to transmit a ringing tone signal to the other party and generate a ringing tone from the other party's intercom. There are effects that can be easily achieved.

Furthermore, even if the other party drops the handset 7 during the conversation, the user can call the other party again by voice and resume the conversation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIGS. 1 to ψ are schematic diagrams showing how the intercom is used, FIG. 3' is a block circuit diagram, FIG. 3 is a block circuit diagram of the control circuit, and FIG. 7
9 is a partial circuit diagram showing a different embodiment; FIG. 9 is a block circuit diagram showing a further different embodiment; and FIG. 9 is a partial circuit diagram showing a further different embodiment. 6... Main body, 7... Handset, 16... Ringing signal generation circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 7

Claims (1)

[Claims] It consists of a main body and a handset that is detachably attached to the main body, and the main body includes an intercom circuit and a ringing signal generation circuit that outputs a ringing signal when the handset is removed. An intercom characterized by being equipped with.