CN2241419Y - Quasi-duplex converter for intercom - Google Patents

Abstract

The utility model relates to a further improved design of quasi-duplex converter for a single-frequency simplex interphone. In the design, a synchronous speech output circuit is additionally arranged; a radio frequency anti-interference network and an anti-self-excited structure adopt a one-way limiter amplification circuit and a gain adjustment circuit to further improve the reliability and the stability of the random conversion sending and receiving state of a complete machine; therefore, quasi-duplex talking mode under single frequency is realized; the utility model is very important for the popularization and application of single-frequency intercoms and the practicability of the application of promotion and incorporation into city telephone network.

Description

Intercom quasi-duplex transducer

This practicality newly belongs to a kind of wireless telecommunications dedicated devices, and specifically a kind of special-purpose audio-switch is the novel quasi-duplex conversion equipment of using with frequency or different single-frequency simplex intercom.

The single worker's intercom of single-frequency in the mobile communication (or alien frequencies) is long with its communication distance, and equipment infusion of financial resources is few, and service fee is low and developed widely.After particularly it enters local network, there is more unprofessional user to use this mobile communications tool.Because the transmitting-receiving of intercom conversion need realize making users to feel inconvenience deeply by the manual switch manual operation, particularly entering behind the local network has influenced speech quality greatly because manual switching is inaccurate, has also just limited applying of such communication tool.The patent (ZL93215698) that the inventor designed and applied for " simplex channel duplexer " for the speech quality that solves this contradiction and raising intercom, this transducer is essentially an automatic change-over by the acoustic control of calling party's language, it is by microtelephone, controlled audio amplifier circuit, trigger and analog switch are formed, by controlled amplifying circuit can be successful the feedback interference of retardance radio reception signal.Select calling party's voice to come trigger switch, thereby the sound control quick automatic switching of state " is sent out " in realization " receipts ", has replaced manual switch hand-manipulated, thereby speech quality is improved greatly, thereby be subjected to liking of user deeply.Find that by further application in practice this design still has technical defective, it is mainly reflected in, and every first language word runs into the lower syllable of fundamental frequency when giving orders or instructions, and still has the phenomenon of losing syllable as " one ", " seven ", " wishing " etc.If volume is excessive then can flood and give orders or instructions sound and that change over switch is started is untimely in receiving the words process, even can't chip at all.Jamproof in addition measure is not strong, and problems such as can forming the self-excitation emission falls in supply voltage, requires further improvement to improve the stability of work.

The purpose of this utility model is to provide a kind of new improvement project, and the improvement that reaches former design circuit by newly-increased circuit improves this device antijamming capability and realizes that manual switch switches fast and accurately.

Basic design concept of the present utility model is to increase anti-interference network in original concrete circuit, adjust controlled sound discharge line structure and add adjusting that power supply weakens to guarantee the steady-working state of complete machine, increased the simultaneous voice signal input circuit among the design, the voice of this partial circuit directly draw the microtelephone of autocollimatic duplexer, and the output voice signal after it is handled is connected to the positive input of talkback microphone mouth.The increase of this part circuit makes calling party's speech signal not only can start the manual switch circuit, also can be gone out by synchronized transmissions by intercom, this has just guaranteed sound control signal and has sent signal from same audio signal source, guaranteed as long as manual switch is opened and can be sent audio signal synchronously, this is circuit not to be produced lose word, and one that loses words is effectively improved.

How to realize below in conjunction with the furthermore bright goal of the invention of the present utility model of the accompanying drawing that provides.

Fig. 1 is the design's a structured flowchart.

Fig. 2 is the electric principle schematic of the design's embodiment.

Wherein 1 is microtelephone, the controlled audio amplifier circuit of 2 representatives, and 201 represent the voice amplifying circuit, and 202 represent the audio frequency amplification control circuit.201A and 201B form two unidirectional limiting amplifiers of 201,202A is a signal negative limiting amplifier, 202B is an agc signal generator, 202C represents filter, 202D represents technotron, 3 represent trigger signal generator, and 3A represents electronic analog swtich, and 4 represent the simultaneous voice signal output apparatus.

The core circuit of this device partly remains controlled sound discharge road 2 as can be seen from the given structure chart of accompanying drawing 1.Its input signal is connected to microtelephone 1, and control signal is connected to the horn mouth of intercom, and the manual switch control signal of being sent by controlled sound discharge road 2 is connected to trigger signal generator 3.The output of this trigger signal generator 3 causes the manual signal switch of intercom.More than design has similar overall structure with first to file.Different is to have set up a simultaneous voice signal output apparatus 4 in the overall structure.The miniature tube 1 of answering of the input of this part circuit, the audio signal of its output is connected to the positive input of talkback microphone mouth, this just can guarantee to finish when manual switch is realized conversion voice transmission, to improve the technical indicator of whole device, prevent that each manual switch from opening the first lower syllable of moment top news loss of voice, particularly fundamental frequency and losing phenomenon and can be able to obvious correction.

Also relate to further improvement in the design of the present utility model in addition to physical circuit.It can also be seen that from accompanying drawing 1 and accompanying drawing 2: controlled audio amplifier circuit 2 comprises two-part structure.A part is the voice amplifying circuit 201 of giving orders or instructions, and a part is that sound is put control circuit 202.201 effect is that the audio signal when giving orders or instructions forms enough intensity by processing and amplifying and produces the conversion that triggering signal realizes manual switch.And 202 effect is feedback to be entered the audio signal limiting gain of microphone 1 when receiving speech phase to avoid producing the self-excitation conversion.The gain controlling termination sound that the input of voice amplifying circuit 201 is connected to microtelephone 1,201 is put the output of control circuit 202.201 output of voice amplifying circuit is connected to the trigger signal generator 3 of manual switch.And sound is put the input of control circuit 202 and is connected to the intercom horn mouth.After 202 processing, produce control signal in bell-mouthed audio signal under " receipts " state like this and make 201 gain decline, thereby though feed back to 201 conversions that have the audio signal input can not produce manual switch from microphone 1.Only the voice signal from the calling party could produce the conversion that enough gains remove to drive manual switch.Can find out further that from Fig. 2 what form voice amplifying circuit 201 is that (201A 201B) and at every grade of signal input part has increased the anti-radio frequency interference circuit of capacitance-resistance (R to the unidirectional limiting amplifier of two-stage ₁And C ₁₄, R ₁₃And C ₁₅).It is to cause the great disparity of amplifying on the audio frequency signal amplitude of back in order to overcome voice low-and high-frequency difference that two-stage voice amplifying circuit is designed to unidirectional amplitude limit formula amplifier architecture.Thereby the amplification that makes the high frequency voice when avoiding low frequency voice amplitude to reach the manual switch triggering level enters the nonlinear operation district of operational amplifier, and the amplification amplitude of low frequency language can't start manual switch and make the losing of indivedual voice when high frequency voice amplitude can reach the manual switch switching levels.Above design can make the linear working range of amplifying circuit expand to be twice and to make the voice low frequency signal fully to amplify, and adding anti-radio frequency interference network can the filtering high-frequency signal, avoids the self-excitation emission, makes the more stable work, reliable of circuit.See that specifically the unidirectional limiting amplifier 201A of the first order is amplifier IC ₁A and peripheral Resistor-Capacitor Unit and diode D ₃The Gain Adjustable joint amplifying circuit that is barricaded as.The gain control circuit that is increased is by resistance R ₁₉, electronic analog swtich IC ₃Be connected at amplifier IC after the A series connection ₁Form between the 1st and the 3rd pin of A.With electronic analog swtich IC ₃The A control end is connected to the output that sound is put control circuit 202.It can also be seen that from Fig. 2 the unidirectional limiting amplifier 201B in the second level is by amplifier IC ₁B and peripheral Resistor-Capacitor Unit and diode D ₂Be barricaded as, by IC ₁Voice signal after the 7th pin output of B is amplified is also by load potentiometer W ₁, capacitor C ₁₁Be connected to the input of trigger signal generator 3.

It can also be seen that from accompanying drawing 1 sound is put control circuit 202 and is made up of audio amplifier circuit 202A and agc signal generator 202B.The input of audio amplifier circuit 202A is connected to the horn mouth of intercom, the control end of output termination 202B.The output signal of agc signal generator 202B is connected to the control end of the unidirectional limiting amplifier 201A of the first order.The audio signal of sending into from horn mouth is connected to the generator 202B that produces gain signal after 202A amplitude limit processing and amplifying like this.The gain control signal that is produced makes electronic analog swtich IC ₃The A conducting.This just equals R ₁₉Be connected on amplifier IC ₁Between 1,2 pin of A.Suitably adjust and select R ₁₉Resistance can make amplifier IC ₁A increases and drops to a suitable scope.Compared with the prior art here not with IC ₁A is converted into emitter follower.But the gain of first order amplifier is dropped to about 10dB.This has just overcome the defective of normally giving orders or instructions to realize the manual switch conversion when volume of reception is excessive, also can freely chip in even facts have proved to use under the bigger situation of this improvement design back volume of reception.Can find out further that from accompanying drawing 2 audio amplifier circuit 202A is by amplifier IC ₁C and peripheral Resistor-Capacitor Unit and diode D thereof ₁A unidirectional amplitude limiting amplifier circuit of forming.Its signal input part is provided with by C ₁₆, R ₉The radio frequency anti-jamming circuit of forming also is connected to the horn mouth of intercom.Its output is by current potential W ₂And capacitor C ₁₂Be connected to agc signal generator 202B.202B is an ic chip ₂The one-shot multivibrator that B forms.Its signal output part is connected to electronic analog swtich IC ₃The control end of A.By electronic analog swtich IC ₃The pass of A, open and realize operational amplifier IC ₁The gain-adjusted of A.

Can also provide ideal design more.Promptly be designed to IC ₁The gain of A is with the adjusting automatically that realizes of bell-mouthed audio signal power.This needs R ₁₆Be designed to two series resistances and (see the R that dotted line marks ₁₆A, R ₁₆B).And agc signal generator 202 is designed to the rheostat that technotron is formed.Make the source ground of field effect transistor, the grid level is connected to the output of 202A by the filter of a 50ms-100ms, and drain electrode is connected to R ₁₆Be changed to R ₁₆A, R ₁₆The Lian Dianshang of two resistance during the b cascaded structure (seeing Fig. 1,2 dotted portion for details).

Avoid self-excitation, the amplifier (IC in the unidirectional amplitude limiting amplifier circuit when descending to some extent for assurance intercom supply voltage ₁A, IC ₁B, IC ₁C) biasing circuit has been taked diode voltage stabilizing form, the biasing resistor R of this part circuit ₁₄, R ₁₀, R ₂₂All be connected to voltage stabilizing didoe V ₂Output.

Manual switch switching signal generator 3 is by ic chip among the given embodiment of Fig. 2 ₂The one-shot multivibrator that A forms.This oscillator is by R ₆, C ₈Determine its trigger pulse width, its control signal is delivered to the electronic analog swtich IC that is serially connected between intercom manual switch and the ground wire ₃The control end of B.When amplifying to form by the two poles of the earth, the voice of giving orders or instructions to make electronic analog swtich IC when enough amplitudes make one-shot multivibrator work ₃The A closure is finished manual switch and is realized conversion, and intercom enters emission state automatically.

Simultaneous voice signal output apparatus 4 specifically can be amplifier IC ₁The emitter follower that D and peripheral Resistor-Capacitor Unit are formed.The signal input is from microtelephone 1.Its output passes through C ₁₃Be connected to former talkback microphone mouth anode, biasing resistor R ₂Be connected to voltage stabilizing didoe V ₂Output.

More than improve circuit and carry out actual test surfaces job stability and greatly improve, the randomness of chipping in communication process has significant improvement, prevents that the ability of self-excitation emission from having obvious enhancing." receipts " that the manual operations state can be finished down " are sent out " conversion and can be realized by voice control is automatic fully, thereby make intercom quasi-duplex transducer practical more, more the effect of conversing near duplex.Particularly this is very significant improvement to common layman.

Claims (10)

1, a kind of intercom quasi-duplex transducer, comprise microtelephone 1 in this converter structure, controlled audio amplifier circuit 2 and intercom manual switch transition trigger signal generator 3 three parts, the audio input signal of controlled audio amplifier circuit 2 is connected to microphone 1, controlled signal is connected to the horn mouth of intercom, the switch controlling signal output on sound discharge road 2 is connected to trigger signal generator 3, the manual switch transition trigger signal of these generator 3 outputs causes the manual signal controlling end of intercom, it is characterized in that in this converter structure, also set up a simultaneous voice signal output apparatus 4, this circuit input signal termination microphone 1, its output audio signal is connected to the positive input of talkback microphone mouth.

2, according to the said quasi-duplex transducer of claim 1, it is characterized in that controlled audio amplifier circuit 2 puts control circuit 202 by voice amplifying circuit 201 and sound and form, the audio signal input end of voice amplifying circuit 201 connects microtelephone 1, its gain controlling is connected to the output that sound is put control circuit 202, the output of voice amplifying circuit 201 is connected to manual trigger signal generator 3, and the input that sound is put control circuit 202 is connected to the intercom horn mouth.

3,, it is characterized in that (201A 201B) forms voice amplifying circuit 201, and every grade signal input part is set up the anti-radio frequency interference network of capacitance-resistance (R by the unidirectional limiting amplifier of two-stage according to the said quasi-duplex transducer of claim 2 ₁And C ₁₄, R ₁₃And C ₁₅).

4,, it is characterized in that the unidirectional limiting amplifier 201A of the first order is amplifier IC according to the said quasi-duplex transducer of claim 3 ₁A and peripheral Resistor-Capacitor Unit and diode D ₃Be barricaded as the amplifying circuit of controllable gain, the ride gain part is by resistance R ₁₉Be serially connected in amplifier IC ₁Electronic analog swtich IC between the 1st, the 3rd pin of A ₃A constitutes, electronic analog swtich IC ₃The control end of A is connected to the output that sound is put control circuit 202, and the unidirectional limiting amplifier 201B in the second level is by amplifier IC ₁B and peripheral Resistor-Capacitor Unit and diode D ₂Be barricaded as, output pin 7 is by load potentiometer W ₁, capacitor C ₁₁Be connected to the input of trigger signal generator 3.

5, according to the said quasi-duplex transducer of claim 3, it is characterized in that sound puts control circuit 202 and be made up of audio amplifier circuit 202A and agc signal generator 202B, the horn mouth of sound discharge road 202A input termination intercom, the control end of output termination 202B, the output signal of agc signal generator 202B is connected to the gain control end of the unidirectional limiting amplifier 201A of the first order.

6,, it is characterized in that sound discharge road 202A is by amplifier IC according to the said quasi-duplex transducer of claim 5 ₁C and peripheral Resistor-Capacitor Unit and diode D thereof ₁A unidirectional amplitude limiting amplifier circuit of forming, its signal input part is provided with by C ₁₆, R ₉Form anti-radio frequency interference circuit and be connected to the horn mouth of intercom, its output is by potentiometer W ₂And capacitor C ₁₂Be connected to agc signal generator 202B, 202B is an ic chip ₂The one-shot multivibrator that B forms, its signal output part is connected to electronic analog swtich IC ₃The control end of A.

7, according to the said quasi-duplex transducer of claim 6, it is characterized in that agc signal generator 202B is the rheostat that technotron is formed, the source ground of this field effect transistor, the grid level is connected to the output of 202A by the filter of 1 50ms-100ms, and drain electrode is connected to R ₁₆Become R ₁₆A, R ₁₆The Lian Dianshang of two resistance during the b cascaded structure.

8, according to claim 4 or 6 said quasi-duplex transducers, it is characterized in that IC ₁A, IC ₁B, IC ₁The biasing circuit of C adopts diode type voltage regulation, its biasing resistor R ₁₄, R ₁₀, R ₂₂All be connected to voltage stabilizing didoe V ₂Output.

9,, it is characterized in that manual switch switching signal generator 3 is by ic chip according to the said quasi-duplex transducer of claim 1 ₂The one-shot multivibrator that A forms is by R ₆, C ₈Determine its trigger pulse width, the defeated electronic analog swtich IC of string between manual switch and ground wire that be connected to of its control signal ₃The control end of B.

10,, it is characterized in that simultaneous voice signal output apparatus 4 is by amplifier IC according to the said quasi-duplex transducer of claim 1 ₁The emitter follower that D and peripheral Resistor-Capacitor Unit are formed, its signal input part passes through capacitor C ₂Be connected to microtelephone 1, its output is connected to talkback microphone mouth anode by C13, and biasing circuit passes through resistance R ₂Be connected on voltage stabilizing didoe V ₂Output.

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