CN204362302U - With the anti-sidetone duplex intercom of resistance-capacitance network - Google Patents
With the anti-sidetone duplex intercom of resistance-capacitance network Download PDFInfo
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- CN204362302U CN204362302U CN201420773314.0U CN201420773314U CN204362302U CN 204362302 U CN204362302 U CN 204362302U CN 201420773314 U CN201420773314 U CN 201420773314U CN 204362302 U CN204362302 U CN 204362302U
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Abstract
The utility model discloses a kind of with the anti-sidetone duplex intercom of resistance-capacitance network, comprise power supply and the microphone be connected with power supply respectively, signal amplification circuit, resistance-capacitance network hybrid circuit, audio frequency power amplifier and loud speaker; The signal of acquisition is input in signal amplification circuit by microphone, then resistance-capacitance network hybrid circuit is input to, the sound signal of telecommunication that resistance-capacitance network hybrid circuit makes two groups of phase places contrary cancels each other, signal after process is input in audio frequency power amplifier by resistance-capacitance network hybrid circuit, and signal is input to loud speaker by described audio frequency power amplifier.The utility model adopts and eliminates sidetone to intercom interference effect with resistance-capacitance network hybrid circuit, microphone signal is anti-phase and exported by collector electrode through amplifying triode, being exported by emitter of homophase, two groups of signals mix through resistance-capacitance network, and the signal regulating variable resistor to make two groups of phase places contrary cancels each other.Adopt this way, in loud speaker, there will not be local microphone voice signal; Eliminate sidetone, circuit working is stablized.
Description
Technical field
The utility model relates to a kind of intercom, and particularly one is with the anti-sidetone duplex intercom of resistance-capacitance network.
Background technology
Although a means of communication indispensable in routine work or life popularized into by mobile terminal device such as mobile phone etc., but some occasion still needs the existence of intercom, as in big assembly occasion, people is very many, be easy to the communication network traffic congestion situation that is moved, now cannot by mobile phone accessing mobile communication network thus cellphone subscriber cannot find the mobile phone called party user of the occasion of gathering that coexists; When and for example travelling in the wild, network signal is very weak, does not even have signal, does not now contact by mobile phone dialing phone and the external world, if cellphone subscriber just easily personal safety accident occurs once scatter with companion.
But the many employings of current wireless interspeaker single work intercom module or semi-simple work intercom module, there will be sidetone signal interference when carrying out non-network communication, user exchanges inconvenience, poor user experience.
Be necessary in summary to occur that the intercom of sidetone is improved to existing.
Utility model content
In view of this, technical problem to be solved in the utility model is to provide a kind of with the anti-sidetone duplex intercom of resistance-capacitance network.
The purpose of this utility model is achieved in that
The utility model provide with the anti-sidetone duplex intercom of resistance-capacitance network, comprise power supply and the microphone be connected with power supply respectively, signal amplification circuit, resistance-capacitance network hybrid circuit, audio frequency power amplifier and loud speaker;
Described microphone converts the voice signal of acquisition to the signal of telecommunication and is input in signal amplification circuit, the sound signal of telecommunication is converted to anti-phase and homophase two kinds of audio signals and is input to resistance-capacitance network hybrid circuit by described signal amplification circuit, the sound signal of telecommunication that described resistance-capacitance network hybrid circuit makes two groups of phase places contrary cancels each other, signal after process is input in audio frequency power amplifier by described resistance-capacitance network hybrid circuit, and signal is input to loud speaker by described audio frequency power amplifier.
Further, described signal amplification circuit comprises amplifying triode Q1; Described amplifying triode base stage is connected with microphone by electric capacity, and described amplifying triode collector electrode to be connected with power supply by resistance and to export the anti-phase sound signal of telecommunication, and described amplifying triode transmitter is connected to ground by resistance and exports the homophase sound signal of telecommunication.
Further, described resistance-capacitance network hybrid circuit comprises first network electric capacity C3, second network electric capacity C4, network tunable resistance R7 and network resistor R8;
Described first network electric capacity C3 is connected with amplifying triode collector electrode, and described second network electric capacity C4 is connected with amplifying triode emitter; Interconnection network adjustable resistance R7 between described first network electric capacity C3 and second network electric capacity C4, described network tunable resistance R7 is connected with network resistor R8 one end with second network electric capacity C4 tie point, and the described network resistor R8 other end is connected to ground.
The beneficial effects of the utility model are: the utility model adopts with resistance-capacitance network hybrid circuit to eliminate sidetone to intercom interference effect, microphone signal is exported by collector electrode through the anti-phase audio signal of amplifying triode 180 °, the audio signal of homophase is exported by emitter, the resistance-capacitance network hybrid circuit that two groups of signals form through first network electric capacity C3, second network electric capacity C4, network tunable resistance R7 and network resistor R8, the signal that regulating networks adjustable resistance R7 can make two groups of phase places contrary cancels each other.Adopt this way, in loud speaker, there will not be local microphone voice signal; Eliminate sidetone, circuit working is stablized.
Accompanying drawing explanation
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein:
Fig. 1 for the utility model embodiment provide with the anti-sidetone duplex intercom circuit diagram of resistance-capacitance network.
Embodiment
Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.Should be appreciated that preferred embodiment only in order to the utility model is described, instead of in order to limit protection range of the present utility model.
As shown in the figure, the utility model provide with the anti-sidetone duplex intercom of resistance-capacitance network, comprise power supply and the microphone be connected with power supply respectively, signal amplification circuit, resistance-capacitance network hybrid circuit, audio frequency power amplifier TDA7052 and loud speaker;
Described microphone converts the voice signal of acquisition to the signal of telecommunication and is input in signal amplification circuit, the sound signal of telecommunication is converted to anti-phase and homophase two kinds of audio signals and is input to resistance-capacitance network hybrid circuit by described signal amplification circuit, the sound signal of telecommunication that described resistance-capacitance network hybrid circuit makes two groups of phase places contrary cancels each other, signal after process is input in audio frequency power amplifier TDA7052 by described resistance-capacitance network hybrid circuit, and signal is input to loud speaker by described audio frequency power amplifier TDA7052.
Described signal amplification circuit comprises amplifying triode Q1; Described amplifying triode base stage is connected with microphone by electric capacity, and described amplifying triode collector electrode to be connected with power supply by resistance and to export the anti-phase sound signal of telecommunication, and described amplifying triode transmitter is connected to ground by resistance and exports the homophase sound signal of telecommunication.
Described resistance-capacitance network hybrid circuit comprises first network electric capacity C3, second network electric capacity C4, network tunable resistance R7 and network resistor R8;
Described first network electric capacity C3 is connected with amplifying triode collector electrode, and described second network electric capacity C4 is connected with amplifying triode emitter; Interconnection network adjustable resistance R7 between described first network electric capacity C3 and second network electric capacity C4, described network tunable resistance R7 is connected with network resistor R8 one end with second network electric capacity C4 tie point, and the described network resistor R8 other end is connected to ground.
The present embodiment provide with the resistance-capacitance network anti-sidetone duplex intercom sound intermediate frequency power amplifier integration module that adopts model to be TDA7052, power supply for the power supply of the power output of 1W can be provided under 6 ~ 12V,
Also be provided with one and prohibit sound interrupteur SW 1, or be its " interruption-free " switch.When it closes, the other side's unit will can't hear any sound.
When making, the connection between two unit need use shielding conductor, its shielding layer grounding.Supply voltage can be selected between 6 ~ 12V, and electric current is greater than 200mA.Two element circuits jointly can be powered and also can independently be powered.
During circuit debugging, first do not connect shielding conductor, the independent circuit adjusting a side.First P1 is adjusted to the maximum position of corresponding volume, then speaks facing to microphone, then regulate R7 until can't hear any voice in loud speaker.Same adjustment is done to the circuit of the opposing party.Because be that two sides independently debug, adopt independently-powered mode.Finally with shielding conductor, two unit are coupled together.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described the utility model by referring to preferred embodiment of the present utility model, but those of ordinary skill in the art is to be understood that, various change can be made to it in the form and details, and not depart from the spirit and scope that the utility model limits.
Claims (3)
1. with the anti-sidetone duplex intercom of resistance-capacitance network, it is characterized in that: comprise power supply and the microphone be connected with power supply respectively, signal amplification circuit, resistance-capacitance network hybrid circuit, audio frequency power amplifier and loud speaker;
Described microphone converts the voice signal of acquisition to the signal of telecommunication and is input in signal amplification circuit, the sound signal of telecommunication is converted to anti-phase and homophase two kinds of audio signals and is input to resistance-capacitance network hybrid circuit by described signal amplification circuit, the sound signal of telecommunication that described resistance-capacitance network hybrid circuit makes two groups of phase places contrary cancels each other, signal after process is input in audio frequency power amplifier by described resistance-capacitance network hybrid circuit, and signal is input to loud speaker by described audio frequency power amplifier.
2. according to claim 1 with the anti-sidetone duplex intercom of resistance-capacitance network, it is characterized in that: described signal amplification circuit comprises amplifying triode Q1; Described amplifying triode base stage is connected with microphone by electric capacity, and described amplifying triode collector electrode to be connected with power supply by resistance and to export the anti-phase sound signal of telecommunication, and described amplifying triode transmitter is connected to ground by resistance and exports the homophase sound signal of telecommunication.
3. according to claim 1 with the anti-sidetone duplex intercom of resistance-capacitance network, it is characterized in that: described resistance-capacitance network hybrid circuit comprises first network electric capacity C3, second network electric capacity C4, network tunable resistance R7 and network resistor R8;
Described first network electric capacity C3 is connected with amplifying triode collector electrode, and described second network electric capacity C4 is connected with amplifying triode emitter; Interconnection network adjustable resistance R7 between described first network electric capacity C3 and second network electric capacity C4, described network tunable resistance R7 is connected with network resistor R8 one end with second network electric capacity C4 tie point, and the described network resistor R8 other end is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420773314.0U CN204362302U (en) | 2014-12-09 | 2014-12-09 | With the anti-sidetone duplex intercom of resistance-capacitance network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420773314.0U CN204362302U (en) | 2014-12-09 | 2014-12-09 | With the anti-sidetone duplex intercom of resistance-capacitance network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204362302U true CN204362302U (en) | 2015-05-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420773314.0U Expired - Fee Related CN204362302U (en) | 2014-12-09 | 2014-12-09 | With the anti-sidetone duplex intercom of resistance-capacitance network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204362302U (en) |
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2014
- 2014-12-09 CN CN201420773314.0U patent/CN204362302U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20151209 |
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| EXPY | Termination of patent right or utility model |