JPS622497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multifunctional intercom device comprising a plurality of loudspeaker type simultaneous call slave units and a plurality of handset type base units.

(Prior Art) Conventionally, in this type of intercom device, as the number of connected slave units increases, it has been necessary to increase the number of channel selection switches on the base unit or increase the number of wires accordingly. Also, for call signals, different circuits and wiring are used between the slave unit and the base unit, and between the base units.
Similarly, it was necessary to increase the wiring for the call signal.

The present invention has been made in order to solve the above-mentioned problems, and makes it easy to expand the function, that is, to increase the number of connected base units and slave units, and to identify the ring tone that distinguishes from where the call is made by tone color. It is possible to reduce the number of wires while satisfying the following conditions and adding functions. This provides an intercom device that is rational in terms of functional development.

(Structure of the Invention) The present invention comprises a plurality of loudspeaker type simultaneous call handset units, a plurality of handset type base units, and a main device inserted between the handset group and the base unit group. be done. In response to the calling operation of each handset, the main device has a first switching circuit consisting of a plurality of contacts that automatically switches and connects the communication path to the calling handset, and a second switching circuit that disconnects the communication path between the handset and the base unit in conjunction with a ringing operation between the handsets; and a first calling oscillator that generates a ring signal with a different tone depending on the ringing operation of each handset. and a first control circuit that controls the operations of the first and second switching circuits and the first call generator, and each base unit is connected to a signal line and receives a call signal from the slave unit. A first terminal that inputs and outputs all call signals as well as a second terminal that is connected to the calling line and inputs and outputs call signals between the base units, and a second terminal that is connected to the calling line and inputs and outputs the call signals between the base units. A call circuit equipped with two types of call levels for making calls at different levels during a call, and switching control between the two types of levels by identifying whether the call is with a handset or a base unit. a second control circuit that transmits an encoded calling signal to the base device to be called, and a third control circuit that receives the encoded signal and performs calling control only when the signal is directed to the base device. The device includes a control circuit and a second call oscillator that generates a call signal for driving a speaker according to the call control.

(Function) According to the configuration of the present invention, when the call switch of a handset is operated, the handset is connected to all the bases, and a ring tone specific to the handset is transmitted to all the bases. When one of the base units responds to this, a direct current for communication flows from the base unit to the slave unit.
By detecting the direct current, the gain of the speech path is set, that is, it is set to a predetermined first speech level.

When a call is made between base units, when the call switch is operated, a coded call signal is sent out, and at the same time, the communication path with the slave unit is disconnected. The calling signal is detected by a base unit corresponding to its encoding, and when the called base unit responds, communication becomes possible through the signal line. At that time, no direct current for communication flows between the parent devices that are communicating, and by detecting this, a predetermined second communication level is set.

(Example) Hereinafter, an example will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the present invention, where R ₁ , R ₂ , R ₃ , and R ₄ are amplified simultaneous call handsets;
K ₁ , ......, K _o are handset-type base units, and 1 is a main unit inserted between the slave unit and the base unit.

Handsets R ₁ to _{R 4} all have the same configuration: speaker ps ₁ , microphone m ₁ , call circuit t ₁ , call switch cs ₁
It consists of The base units K ₁ to _{K o} all have the same configuration, including a speaker SP ₁ for generating a ringing tone that also serves as a receiver, a microphone M ₁ , a communication circuit T ₁ , a control circuit (second control circuit) H ₁ , and a ringing tone generation speaker SP 1 that also functions as a receiver. It is composed of an extension control circuit (third control circuit) SE ₁ and an extension calling oscillator (second calling oscillator) G ₁ . The main device 1 is
Separate terminals r ₁ to _{r 4} to connect child units R ₁ to _{R 4} and parent unit K ₁
It has common terminals s and c that connect ~K _o , and has internal relays A, B, C, and D and a control circuit (first control circuit) 2 that controls them, and is controlled by this control circuit 2. The device includes a calling oscillator (first calling oscillator) 3 that generates calling signals of different tones in response to calling operations of handsets _R1 to _R4 .

Next, the operation of this embodiment will be explained.

In the standby state, the first switching circuit consisting of relays A, B, C and their contacts a ₁ - a ₃ , b ₁ - b ₃ , c ₁ - c ₃ has contacts a ₂ , b ₂ , c ₂ All contacts a ₁ , b ₁ ,
c It is inserted into _{the 1} side. In the base units K ₁ to _{K o} , the handset and receiver are placed, and the communication circuits T ₁ to _{T o}
No direct current voltage appears on the line extending from the control circuits H ₁ to H _o . (When you lift the handset, a constant DC voltage is output, which supplies DC current to the handset.) When you operate the ring switch on any one of handsets _R1 to _R4 , a ringing signal is generated. The signal is input to the control circuit 2, and relays A, B, and C are selectively activated, and the handset that presses the switch is connected to the communication path. For example, when you operate switch cs ₁ , relay A,
B and C are all in the driving state, and contacts a ₂ , b ₂ , c ₂
are all applied to contacts a ₁ , b ₁ , and c ₁ . When switch cs ₂ is operated, relays B and C are activated, and contacts a ₂ is placed on the a ₃ side, b ₂ is placed on the b ₁ side, and c ₂ is placed on the c _{1 side.}
It is thrown into the side. When operating Switch CS ₃ ,
Only relay C is activated, and contacts _a2 are connected to _a3 side, _b2 is connected to _b3 side, and _c2 is connected to _c1 side. or,
When switch cs ₄ is operated, all relays are deactivated, contacts a ₂ are placed on the a ₃ side, b ₂ is placed on the b ₃ side, and c ₂ is placed on the c ₃ side.

A simple circuit example of the control circuit 2 that performs such operation control is shown in FIG. In Figure 2,
4 is a latch circuit, and 5 is a calling signal detection circuit.

If you now operate switch cs ₁ of slave unit R ₁ , relays A, B, and C will operate, and contacts a ₂ , b ₂ , and c ₂ will all be closed to contacts a ₁ , b ₁ , and c ₁ , so The communication circuit t ₁ is connected to the communication circuits T 1 -T _o through contacts a ₁ , a ₂ , d ₂ , d ₁ and control circuits H _{1 -H o} . at the same time,
A signal with a level preset for the handset _R1 is input to the calling oscillator 3, and a signal with a frequency corresponding to the level, that is, a calling signal with a specific tone is output from the oscillator 3.

The calling signal passes through the signal line SL from the contacts d ₂ and d ₁ and reaches all base units K ₁ to K _o , and is sent to the speaker SP ₁
~Sound SP _o . The calling signal is also sent to the handset _R1 side, and this can be heard as a back tone.

When you hear the ringtone, turn on one of the base units, e.g.
When the handset of K ₁ is raised, a constant DC voltage appears in the line from the communication circuit T ₁ to the control circuit H ₁ , which causes a DC current to flow to the handset R ₁ . This DC current is detected by the control circuit _H1 , and the communication circuit _T1 is controlled and set to a predetermined first gain. That is, a call is made between the slave unit and the base unit at a predetermined level.

When making a call between base units, call the other party's base unit by operating call switches CS ₁ to CS _o .
Now, when the call switch CS _o of the base unit K ₁ is operated, a call signal encoded for the base unit K _o is sent from the control circuit SE ₁ to the call line CL. On the other hand, SE ₁ to _{SE o} each include a circuit that detects only the coded call signal for its own machine, and therefore the coded call signal for the base machine K _o is sent to the control circuit. Only SE _o will detect it. Control circuit that detects encoded call signal
SE _o drives the call generator G _o to generate a ring tone from the speaker SP _o .

The calling signal sent from the control circuit SE ₁ is also sent to the control circuit 2 at the same time. Then, as shown in FIG. 2, after the call signal detection circuit 5 detects the signal, the relay D, which is the second switching circuit, is activated to switch the connection of the contact d ₂ from d ₁ to d ₃ . Disconnect the communication line with the machine.

When the base unit K _o receives a call and answers by picking up the handset, a constant DC voltage appears on the line from the communication circuit T _o to the control circuit H _o , and a call can be made to the base unit K ₁ through the signal line SL. state. On the other hand, since the same value of DC voltage is output from the parent unit K ₁ , there is no level difference between the parent units K ₁ and _Ko , and no DC current flows. Therefore, the control circuits H ₁ and H _o that detected this are connected to the communication circuits T ₁ and T _o
is controlled to set the second gain. That is, calls between base units are conducted at a predetermined level different from the call level between the slave unit and the base unit (Effects of the Invention) As is clear from the embodiments, the present invention
Multiple loudspeaker simultaneous call handsets (e.g. doorbell)
In addition to making it possible to talk between any one of these and multiple handset-type base units, it is also possible to talk between handset-type base units, and the call level is automatically set in the former case and the latter case. In both the former and latter cases, it is possible to communicate in an optimal state.

Moreover, both the base unit and the slave units are connected in parallel to a common communication path, and the base unit and slave units are characterized in that it is extremely easy to add or reduce the number of base units and slave units.

Further, according to the present invention, when a call is made from a slave unit, a ring tone sounds on all base units, and furthermore, it is possible to easily determine which slave unit is calling from this ring tone, and which base unit However, in response to this, a conversation can be made with the handset, and in this case, it is sufficient to simply raise the handset, so it has the advantage of being extremely easy to handle.

Furthermore, when calling between base units, you can call the other party's base unit and make a call by simply operating the call switch and outputting a coded signal to the desired base unit. , the handset side is disconnected and calls can be made at a relatively low level, which is desirable for a handset/receiver.

As described above, according to the present invention, it is possible to provide an intercom device that has a simple overall configuration and is extremely easy to use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an intercom device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a first control circuit included in the main device. R ₁ ~ R ₄ ... Loudspeaker type simultaneous call handset, K ₁ ~ _{K o} ......
Handset-type base unit, 1... Main device, 2... First control circuit, 3... First call generator, A, B, C, D
...Relay, sp ₁ , SP ₁ , SP _o ... Speaker, m ₁ ,
M ₁ , M _o ... microphone, t ₁ , T ₁ , T _o ... telephone circuit,
H ₁ , H _o ... second control circuit, SE ₁ , SE _o ... third control circuit
control circuit, CS ₁ , CS ₁ ~ CS _o ... call switch,
G ₁ , G _o ... second call generator, SL ... signal line,
CL...Call line.

Claims (1)

[Claims] 1 Consists of a plurality of loudspeaker type simultaneous call handset units, a plurality of handset-type base units, and a main device inserted between the handset group and the base unit group, and the main device is A first switching circuit consisting of a plurality of contacts that automatically switches and connects a call path to the calling handset in response to a calling operation of the handset; and a first switching circuit that is linked to the calling operation between the base units. a second switching circuit that disconnects a communication path between the handset and the base unit; a first call generator that generates a ringing signal with a different tone depending on the calling operation of each handset; , a second switching circuit, and a first control circuit that controls the operation of the first call generator, each base unit is connected to a signal line and inputs a call signal from the slave unit, and all A first terminal that inputs and outputs a call signal, and a second terminal that is connected to a calling line and inputs and outputs a call signal between the base units, which are different when talking with the handset and when talking between the base units. a second communication circuit for controlling switching between the two levels by identifying whether the call is with a handset or a base unit; A control circuit and a third circuit that transmits an encoded calling signal to the base device to be called, receives the encoded signal, and performs calling control only when the signal is directed to the parent device.
1. An intercom device comprising: a control circuit; and a second call oscillator that generates a call signal for driving a speaker according to the call control.