CN2230065Y - Electronic speaker-phone for multiple users - Google Patents

Abstract

The utility model discloses an electronic speaker-phone for multiple users, which is suitable for transmission by two transmission lines and can realize that users can be selected for talkback, comprising a dial-up part, a decoding part. A ringing part, a talkback part and a control part. The utility model has the advantages of simple structure and capability of talkback for multiple users; besides, the talkback of the utility model has security.

Description

A kind of multi-user electronic intercom

The utility model relates to two transmission lines of a kind of suitable usefulness to be transmitted, and realization can select the user to carry out the multi-user electronic intercom of communicating talkback.

Multi-user's intercom of the prior art has and adopts two transmission lines to transmit, and also has to adopt many transmission lines to finish transmission, and its latter is because structure and wiring are complicated, for assembling, install and maintenance brings a lot of troubles; The former, main, pair machine of telling of having, main frame can be called out the machine of paying arbitrarily, then can not converse but pay between the machine, though realizing of having conversed its complex structure between pair machine, cost cost height, in addition, also often the limit is between two sides for existing its communicating talkback of multi-user's intercom, and communicating talkback does not possess confidentiality.

The purpose of this utility model is to provide two transmission lines of a kind of suitable usefulness to transmit, and realization can select the user to carry out the multi-user electronic intercom of both sides' communicating talkback.

Secondly, the purpose of this utility model is that also the multi-user electronic intercom that is provided can realize the MPTY intercommunication.

Moreover another purpose of the present utility model is that the multi-user electronic intercom that is provided can realize two sides or secret telephony intercommunication in many ways.

Its purpose is realized by following scheme:

This intercom comprises section dialing in, decoding part, ring part and conversation part and control section, is characterized in that described control section comprises K switch ₁, K ₂, K ₃And by containing triode TV ₄, capacitor C ₃The electric current holding circuit, wherein, K switch ₃Be connected on the keyboard of described section dialing in, constitute the connecting relation that the may command keyboard outwards sends " # " or " * " sign indicating number; The electric current holding circuit is connected between power supply and the section dialing in, and constituting to section dialing in provides on-hook moment to keep the connecting relation of electric current; K switch ₁Be connected between power supply, section dialing in and the conversation part, constitute the connecting relation of controllable power to section dialing in and the power supply of conversation part; K switch ₂Then be connected between the electric current holding circuit of power supply, ring part, control section, constitute power supply and partly power or the connecting relation of electric current holding circuit charging in control section to ring convertiblely.

It is desirable to, in the such scheme, control section also comprises K switch ₄, this K switch ₄Be connected between described decoding part and the outside line, constitute the connecting relation that the described decoding part of may command divides the code signal that receives outside line.

Better is, in the such scheme, control section also comprises and contains relay J and triode TV ₃The conversation dialing control circuit again of powering, wherein, triode TV ₃As the switch element of relay J, its base stage is controlled by the decoding part, and the normally-closed contact of relay J then is connected to K switch ₁Transfer point and conversation part and section dialing between, formation can further be controlled the connecting relation that power supply is powered to conversation part and section dialing in.

Fig. 1, Fig. 2 and Fig. 3 all are embodiments of the present utility model.

Shown in accompanying drawing, conversation part IC ₃Amplify integrated LM386 and peripheral circuit receiver MC, transmitter T etc. form by audio frequency, its input/output signal passes through capacitor C ₁With outside line L ₁Connect L ₂Be common ground; Section dialing in IC ₄Be made up of integrated MK5087 and numeric keypad etc., the touch-tone signal DTMF that section dialing in sends is exported by 16 pin, through capacitor C ₁Be coupled to outside line L ₁Decoding part IC ₁, IC ₂Form by integrated MT8870 and CD4028 etc., when receiving outside line L ₁On effective dtmf signal the time, through transistor T V ₁Amplify, by the 2 pin input of MT8870, the function of MT8870 is to convert dtmf signal to 8421 yards by D ₁～D ₄Pin is exported, and is input to A, B, C, D four pin of CD4028, and CD4028 has latch function, and its effect is to convert decimal code to 8421 yards, and by Y ₀～Y ₉Pin output, the number 0～9 on the section dialing in numeric keypad respectively should with the Y of integrated CD4028 ₀～Y ₉Pin is corresponding one by one, when numeric keypad sends # or * sign indicating number, and Y ₀～Y ₉All be low level, set Y ₀～Y ₉Be initial condition during low level all, when receiving a dtmf signal, through decoding part, Y ₀～Y ₉In export a high level accordingly, with Y ₀～Y ₉In one be attached to triode TV ₂Base stage, control TV ₂Saturated and end Y ₀～Y ₉Middle control triode TV ₂The number of that of base stage correspondence is the numbering of this machine, for example, and Y ₀Control TV ₂Base stage, then this machine is numbered 0; Ring part IC ₅By integrated KD-153, loud speaker B, triode TV ₂Deng composition, by triode TV ₂Conducting and by carrying out power supply control, TV ₂Conducting, integrated KD-153 power connection, ringing tone takes place in loud speaker B; Control circuit comprises K switch ₁, K ₂, K ₃And triode TV ₄And capacitor C ₃, its effect is to send # or * sign indicating number when controlling the conversion of power supply and control on-hook, to finish the releasing to online each machine locking.

Embodiment 1, can realize purpose one by this example.Its course of work is as follows:

With reference to Fig. 1, during on-hook, K switch ₁Be in A point place, disconnect to conversation part and section dialing in power supply, K switch ₂Be in B point place, power supply partly provides power supply to ring, and when the dual tone multi-frequency dtmf signal was arranged in the outside line, this signal was through triode TV ₁Amplify back input decoding part, one, identical if the corresponding number of this signal and telephone set are numbered, triode TV then ₂Base stage can obtain high level, at this moment, and TV ₂Saturation conduction, ring is partly worked, and loud speaker B sends ring, if off-hook, K switch ₁Be in the C point, K switch ₂Be in the D point, power supply disconnects partly powers to ring, and ring stops, and power supply is transferred to conversation part and section dialing in power supply, simultaneously, and to capacitor C ₃Charge, at this moment both sides can begin intercommunication conversation, when end of conversation on-hook moment, and capacitor C ₃Just by triode TV ₄Base stage discharge, make triode TV ₄Conducting is kept electric current for section dialing in provides, because K switch ₃Be in on-state during on-hook, so dial-up circuit just sends " # " coded signal to outside line, after online each machine is received the corresponding dtmf signal of " # " sign indicating number, its Y ₀～Y ₉All be low level, restPose, subsequently, owing to keep the disappearance of electric current, sending also of " # " coded signal stops thereupon; If unmanned off-hook during calling party's on-hook, sends " # " coded signal equally, each machine is restPosed, therefore callee's telephone set can not produce ring again.Two, if the numbering of the signal received and this machine not simultaneously, owing to transistor T V ₂End, so do not send ring.

Embodiment 2: can realize purpose two by this example.Its structure and the course of work are described below:

With reference to Fig. 2, on the basis of embodiment 1, in decoding part and outside line L ₁Between be connected to K switch ₄, during on-hook, it is in closure state, during off-hook, then is in off-state.If online first, second two machines off-hook are conversed, their dial-up circuit while is energized also, as long as wherein a side is ready, then can continue dialing, selected telephone set still can be received the dtmf signal that sends in online other each machines, its ring part is also sent ringing tone, if its off-hook according to said process, then can carry out Three-Way Calling, in like manner, if correspondent wherein redials, then can resurrect four directions, the 5th side or the like, and then realize the MPTY intercommunication, since the telephone set of off-hook, its K switch ₄Disconnect, so, be not subjected to other telephone set to continue the influence of dialing.

Embodiment three: this example can realize purpose three.Its structure and the course of work are as follows:

With reference to Fig. 3, on the basis of embodiment 2, also be provided with and comprise relay J and triode TV ₃The conversation dialing control circuit again of powering, wherein, triode TV ₃Base stage by the Y of decoding part ₀～Y ₉Control removes the selected oxide-semiconductor control transistors TV that is used for ₂Y outside, all the other 9 with diode D ₁～D ₅Form OR-gate and be attached to transistor T V ₃Base stage on.When the coding of the DTMF of outside line and the coding that receives extension set not simultaneously, corresponding to transistor T V ₂That of base stage Y is " 0 " signal, has in all the other 9 one to be " 1 " certainly, and at this moment, OR-gate output " 1 " signal is if this receives extension set off-hook, K switch ₂Be in the D point, K switch ₁Then be in the C point, at this moment, transistor T V ₃Conducting, relay J adhesive, its normally-closed contact J _1-1Disconnect, stop power supply further to the power supply of conversation part, therefore, this machine can not be heard dialogue wherein from first, the second extension set of conversing; But if among first, second two sides,, then can continue dialing as long as wherein a side is ready, selected third party, its ring part is just sent ring, simultaneously, transistor T V ₃End, provide condition for stoping the relay J adhesive, if this third party's off-hook, K switch ₁Then be in the C point, K switch ₂Then be in the D point, for section dialing in and conversation part provide power supply, simultaneously, to capacitor C ₃Charging, at this moment, the third party can participate in dialogue, in like manner, can resurrect four directions, the 5th side or the like, thereby, realize secret telephony intercommunication in many ways.This scheme can also be at transistor T V ₃Collector electrode or emitter on the serial connection light-emitting diode D ₆, be used for when online certain two machine just when intercommunication is conversed, third party's circuit of prompting off-hook just is used, promptly the line is busy.

Multi-user's intercom of the present utility model compared with prior art has following advantage.

1. the utility model can realize selecting the user to carry out both sides' communicating talkback, is fit to transmit with two transmission lines, has characteristic of simple structure.

2. the utility model also can realize carrying out simultaneously in many ways communicating talkback.

3. two above-mentioned sides or communicating talkback in many ways have confidentiality.

Claims (4)

1. a multi-user electronic intercom comprises section dialing in, decoding part, ring part and conversation part and control section, it is characterized in that described control section comprises K switch ₁, K ₂, K ₃And by containing triode TV ₄, capacitor C ₃The electric current holding circuit, wherein, K switch ₃Be connected on the keyboard of described section dialing in, constitute the may command keyboard sends " * " sign indicating number or connecting relation from " # " sign indicating number to outside line; The electric current holding circuit is connected between power supply and the section dialing in, and formation can provide on-hook moment to keep the connecting relation of electric current to section dialing in; K switch ₁Be connected between power supply, section dialing in and the conversation part, constitute the connecting relation of controllable power to section dialing in and the power supply of conversation part; K switch ₂Then be connected between the electric current holding circuit of power supply, ring part and control section, constitute power supply and partly power or the connecting relation of electric current holding circuit charging in control section to ring convertiblely.

2. according to the intercom of claim 1, it is characterized in that described control section also comprises K switch ₄, this K switch ₄Be connected between described decoding part and the outside line, constitute the connecting relation that the described decoding part of may command divides the code signal that receives outside line.

3. according to the intercom of claim 2, it is characterized in that described control section also includes by containing relay J and triode TV ₃The conversation dialing control circuit again of powering, wherein, triode TV ₃As the switch element of relay J, its base stage is controlled by the decoding part, and the normally-closed contact of relay then is connected to K switch ₁Transfer point C and conversation part and section dialing between, formation can further be controlled the connecting relation that power supply is powered to conversation part and section dialing in.

4. according to the intercom of claim 3, it is characterized in that described triode TV ₃Collector electrode or emitter on be serially connected with light-emitting diode D ₆

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