CN204314648U - A kind of audio amplifier power control system detected based on sound signal - Google Patents
A kind of audio amplifier power control system detected based on sound signal Download PDFInfo
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- CN204314648U CN204314648U CN201420867555.1U CN201420867555U CN204314648U CN 204314648 U CN204314648 U CN 204314648U CN 201420867555 U CN201420867555 U CN 201420867555U CN 204314648 U CN204314648 U CN 204314648U
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- audio amplifier
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- power control
- photoisolator
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Abstract
The utility model discloses a kind of audio amplifier power control system detected based on sound signal, comprise the audio amplifier circuit connected successively, sound signal change-over circuit, microcontroller and audio amplifier power control circuit, audio amplifier circuit comprises Differential Input audio-frequency power amplifier, sound signal change-over circuit comprises the photoisolator connected successively, first phase inverter and the second phase inverter, audio amplifier power control circuit comprises solid-state relay, the input end input speech signal of Differential Input audio-frequency power amplifier, its output terminal connects photoisolator input end, photoisolator output terminal connects the first inverter input, second inverter input connects the first inverter output, its output terminal connects microcontroller, the input end of solid-state relay connects microcontroller, its output terminal connects the AC power of audio amplifier.The utility model controls the power supply of audio amplifier by detecting sound signal, and detection sound signal can not cause voice distortion, does not affect session result.
Description
Technical field
The utility model belongs to electronic measurement and control field, particularly a kind of audio amplifier power control system detected based on sound signal.
Background technology
At present, the Active Eyes under Network Environment is extensively adopted in the places such as wisdom community, intelligent transportation, to obtain scene photo image information, and realizing and monitoring point session, providing technical support for building safe city, safety small towns, intelligent public security and digital urban management etc.
In order to the remote interaction function of augmented video supervisory system, voice collecting, transmission and playback equipment is usually adopted to realize session.The audio amplifier being usually used for playing is placed on open air, powered operation incessantly.And in actual use, when only having generation emergency events to need with Surveillance center's session, audio amplifier just needs unlatching work.Like this, audio amplifier is in power supply state for a long time, not only shortens the serviceable life of audio amplifier, and waste electric energy, generation noise.
Conventional solution is by detecting the power supply controlled audio amplifier to sound signal, the detection of sound signal is amplified and detection sound signal with audio-frequency transformer (AFT) usually, this method can reduce voice signal amplitude significantly, causes voice distortion, affects session result.
Utility model content
In order to solve the problem that above-mentioned background technology proposes, the utility model has aimed to provide a kind of audio amplifier power control system detected based on sound signal, control the power supply of audio amplifier by detecting sound signal, and detection sound signal can not cause voice distortion, does not affect session result.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is:
A kind of audio amplifier power control system detected based on sound signal, comprise the audio amplifier circuit connected successively, sound signal change-over circuit, microcontroller and audio amplifier power control circuit, also comprise power circuit, described power circuit comprises AC-DC conversion module, the input termination alternating current of AC-DC conversion module, its output terminal connects microcontroller respectively, audio amplifier circuit, the feeder ear of sound signal change-over circuit and audio amplifier power control circuit, described audio amplifier circuit comprises Differential Input audio-frequency power amplifier, sound signal change-over circuit comprises the photoisolator connected successively, first phase inverter and the second phase inverter, audio amplifier power control circuit comprises solid-state relay, the input end input speech signal of described Differential Input audio-frequency power amplifier, its output terminal connects the input end of photoisolator, the output terminal of photoisolator connects the input end of the first phase inverter, the input end of the second phase inverter connects the output terminal of the first phase inverter, its output terminal connects microcontroller, the input end of solid-state relay connects microcontroller, its output terminal connects the AC power of audio amplifier.
Wherein, the model of above-mentioned Differential Input audio-frequency power amplifier is MAX9718AEUB, and the model of described photoisolator is TLP521-1, and the model of first, second phase inverter described is 74HC04.
Wherein, the OUT-end of above-mentioned Differential Input note amplifier is held with the D+ of photoisolator and is connected, and the OUT+ end of Differential Input note amplifier is held with the D-of photoisolator and is connected.
Wherein, the OUT-end of above-mentioned Differential Input note amplifier is connected by the first light emitting diode between holding with the D+ of photoisolator, the anode of the first light emitting diode connects the OUT-end of Differential Input note amplifier, and its negative electrode connects the D+ end of photoisolator.
Wherein, the model of above-mentioned microcontroller is C8051F912, and the model of described solid-state relay is S206ZW.
Wherein, certain I/O mouth of above-mentioned microcontroller connects the anode of the second light emitting diode, the plus earth of the second light emitting diode; The positive input terminal of described solid-state relay connects another I/O mouth of microcontroller, the negative input end ground connection of solid-state relay.
Adopt the beneficial effect that technique scheme is brought:
The utility model uses embedded technology to detect sound signal, automatically controls the power supply of audio amplifier power supply and power-off, greatly can extend the serviceable life of audio amplifier, save the energy, and effectively reduce noise, protection of the environment, reduction use cost.The utility model adopts Differential Input audio-frequency power amplifier to amplify voice signal, not only with low cost, noise inhibiting ability can also be improved and reduce the hum started and in turn off process, photoisolator is adopted not only to achieve the isolation of signal, also achieve the conversion of signal, thus make whole system can not allow voice distortion, reach good session result.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present utility model.
Fig. 2 is physical circuit figure of the present utility model.
Label declaration: 1, power circuit; 2, audio amplifier circuit; 3, sound signal change-over circuit; 4, microcontroller; 5, audio amplifier power control circuit.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model is described in detail.
System architecture diagram of the present utility model as shown in Figure 1, a kind of audio amplifier power control system detected based on sound signal, comprise the audio amplifier circuit connected successively, sound signal change-over circuit, microcontroller and audio amplifier power control circuit, also comprise power circuit, described power circuit comprises AC-DC conversion module, the input termination alternating current of AC-DC conversion module, its output terminal connects microcontroller respectively, audio amplifier circuit, the feeder ear of sound signal change-over circuit and audio amplifier power control circuit, described audio amplifier circuit comprises Differential Input audio-frequency power amplifier, sound signal change-over circuit comprises the photoisolator connected successively, first phase inverter and the second phase inverter, audio amplifier power control circuit comprises solid-state relay, the input end input speech signal of described Differential Input audio-frequency power amplifier, its output terminal connects the input end of photoisolator, the output terminal of photoisolator connects the input end of the first phase inverter, the input end of the second phase inverter connects the output terminal of the first phase inverter, its output terminal connects microcontroller, the input end of solid-state relay connects microcontroller, its output terminal connects the AC power of audio amplifier.
In the present embodiment, the model of Differential Input audio-frequency power amplifier is MAX9718AEUB; The model of photoisolator is TLP521-1; The model of first, second phase inverter is 74HC04; The model of microcontroller is C8051F912; The model of described solid-state relay is S206ZW.
Physical circuit figure of the present utility model as shown in Figure 2, comprises power circuit 1, audio amplifier circuit 2, sound signal change-over circuit 3, microcontroller 4 and audio amplifier power control circuit 5.Power circuit 1 comprises an AC-DC conversion module, the positive input terminal of this AC-DC conversion module is connected with the anode of alternating current by fuse F1, access filter capacitor C4 in parallel and electric capacity C10 between the positive and negative input end of AC-DC conversion module, then powered for audio amplifier circuit 2, sound signal change-over circuit 3, microcontroller 4 and audio amplifier power control circuit 5.In order to keep the clear of accompanying drawing, in Fig. 2, eliminate the supply line between power circuit 1 and other modules.Audio amplifier circuit 2 comprises a Differential Input audio-frequency power amplifier MAX9718AEUB, and sound signal change-over circuit 3 comprises the photoisolator TLP521-1, the first phase inverter 74HC04, the second phase inverter 74HC04 that connect successively.IN+, IN-end of MAX9718AEUB inputs positive and negative voice signal respectively, the OUT-of MAX9718AEUB holds the anode of connection first LED 1, the negative electrode of LED1 connects the D+ end of TLP521-1 through resistance R1, the OUT+ end of MAX9718AEUB directly connects the D-end of TLP521-1, the output terminal of TLP521-1 connects the input end of the first phase inverter, and the output terminal of the first phase inverter connects the input end of the second phase inverter.Microcontroller 3 comprises a single-chip microcomputer C8051F912, the P0.0 mouth of C8051F912 connects the output terminal of the second phase inverter, P1.5 mouth connects the anode of the second LED 2 through resistance R6, the plus earth of LED2, and crystal oscillator X1, electric capacity C1, electric capacity C2 form the oscillatory circuit of C8051F912.Audio amplifier power control circuit 5 comprises a solid-state relay S206ZW, also comprise driving circuit and filtering circuit, resistance R3, resistance R4, switching tube Q1 form described driving circuit, resistance R5, voltage dependent resistor (VDR) RT, electric capacity C3 form described filtering circuit, the P1.3 mouth of C8051F912 connects the base stage of Q1 through resistance R4, the collector of Q1 connects the positive input terminal of S206ZW, the negative input end ground connection of S206ZW, S206ZW output terminal be connected through the output of filtering circuit with audio amplifier AC power, control the output of AC power, realize the keying of audio amplifier.
Principle of work of the present utility model:
Differential Input audio-frequency power amplifier MAX9718AEUB carries out differential amplification to voice signal, and give the signal after amplifying the isolation and analog to digital conversion that photoisolator TLP521-1 realizes voice signal, C8051F912 is given again after the process of two-stage phase inverter, C8051F912 drives the break-make of S206ZW according to the voice digital signal received, thus control the output of the AC power of audio amplifier, realize the keying of audio amplifier.First LED 1 is in order to show the power of the voice signal of MAX9718AEUB output, the power of its voice signal is directly proportional to the brightness of LED1, whether the first LED 2 receives voice digital signal in order to show C8051F912, glittering when receiving voice signal, do not receive voice signal often bright.
Above embodiment is only and technological thought of the present utility model is described; protection domain of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, all falls within the utility model protection domain.
Claims (6)
1. the audio amplifier power control system detected based on sound signal, it is characterized in that: comprise the audio amplifier circuit connected successively, sound signal change-over circuit, microcontroller and audio amplifier power control circuit, also comprise power circuit, described power circuit comprises AC-DC conversion module, the input termination alternating current of AC-DC conversion module, its output terminal connects microcontroller respectively, audio amplifier circuit, the feeder ear of sound signal change-over circuit and audio amplifier power control circuit, described audio amplifier circuit comprises Differential Input audio-frequency power amplifier, sound signal change-over circuit comprises the photoisolator connected successively, first phase inverter and the second phase inverter, audio amplifier power control circuit comprises solid-state relay, the input end input speech signal of described Differential Input audio-frequency power amplifier, its output terminal connects the input end of photoisolator, the output terminal of photoisolator connects the input end of the first phase inverter, the input end of the second phase inverter connects the output terminal of the first phase inverter, its output terminal connects microcontroller, the input end of solid-state relay connects microcontroller, its output terminal connects the AC power of audio amplifier.
2. according to claim 1 a kind of based on sound signal detect audio amplifier power control system, it is characterized in that: the model of described Differential Input audio-frequency power amplifier is MAX9718AEUB, the model of described photoisolator is TLP521-1, and the model of first, second phase inverter described is 74HC04.
3. according to claim 2 a kind of based on sound signal detect audio amplifier power control system, it is characterized in that: the OUT-end of described Differential Input note amplifier is held with the D+ of photoisolator and is connected, the OUT+ end of Differential Input note amplifier is held with the D-of photoisolator and is connected.
4. according to claim 3 a kind of based on sound signal detect audio amplifier power control system, it is characterized in that: the OUT-of described Differential Input note amplifier end is connected by the first light emitting diode between holding with the D+ of photoisolator, the anode of the first light emitting diode connects the OUT-end of Differential Input note amplifier, and its negative electrode connects the D+ end of photoisolator.
5. according to claim 1 a kind of based on sound signal detect audio amplifier power control system, it is characterized in that: the model of described microcontroller is C8051F912, the model of described solid-state relay is S206ZW.
6. according to claim 5 a kind of based on sound signal detect audio amplifier power control system, it is characterized in that: certain I/O mouth of described microcontroller connects the anode of the second light emitting diode, the plus earth of the second light emitting diode; The positive input terminal of described solid-state relay connects another I/O mouth of microcontroller, the negative input end ground connection of solid-state relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420867555.1U CN204314648U (en) | 2014-12-31 | 2014-12-31 | A kind of audio amplifier power control system detected based on sound signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420867555.1U CN204314648U (en) | 2014-12-31 | 2014-12-31 | A kind of audio amplifier power control system detected based on sound signal |
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| CN204314648U true CN204314648U (en) | 2015-05-06 |
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| CN201420867555.1U Expired - Fee Related CN204314648U (en) | 2014-12-31 | 2014-12-31 | A kind of audio amplifier power control system detected based on sound signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111182157A (en) * | 2019-12-30 | 2020-05-19 | 泰弗思科技(安徽)有限公司 | Isolated four-wire call one-to-two circuit |
-
2014
- 2014-12-31 CN CN201420867555.1U patent/CN204314648U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111182157A (en) * | 2019-12-30 | 2020-05-19 | 泰弗思科技(安徽)有限公司 | Isolated four-wire call one-to-two circuit |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150506 Termination date: 20171231 |
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| CF01 | Termination of patent right due to non-payment of annual fee |