CN101707477A - Circuit for eliminating impact sound generated in switching process - Google Patents
Circuit for eliminating impact sound generated in switching process Download PDFInfo
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- CN101707477A CN101707477A CN200910110236A CN200910110236A CN101707477A CN 101707477 A CN101707477 A CN 101707477A CN 200910110236 A CN200910110236 A CN 200910110236A CN 200910110236 A CN200910110236 A CN 200910110236A CN 101707477 A CN101707477 A CN 101707477A
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Abstract
The invention discloses a circuit for eliminating impact sounds generated in switching process. The circuit comprises a power supply and an audio power amplifier. A switch voltage generation circuit is connected with the power supply, and the switch voltage generation circuit is connected with a turn-on response switch circuit and a turn-off response switch circuit; the switch voltage generation circuit provides a switch voltage signal to control the turn-on response switch circuit and the turn-off response switch circuit; and the output terminals of the turn-on response switch circuit and the turn-off response switch circuit are connected with the audio power amplifier so as to provide a silencing signal for the audio power amplifier during the turn-on and turn-off moment. The switch voltage generation circuit outputs a switch voltage signal U1 to control the turn-on response switch circuit and the turn-off response switch circuit, thus outputting effective silencing signal MUTE, and eliminating the impact sounds during the turn-on and turn-off process. The circuit can effectively and reliably eliminate the impact sounds of the audio equipment in the turn-on and turn-off process, has low cost, and is simple, reasonable, safe and reliable.
Description
[technical field]
The present invention relates to the audio frequency apparatus product technical field, relate in particular to a kind of circuit that is used to eliminate the switching on and shutting down impulsive sound of audio frequency apparatus.
[background technology]
For audio frequency apparatuses such as television set, DVD and sound equipments, its audio system is general earlier with audio frequency small-signal input audio power amplifier circuit, exports to loud speaker after handling, amplify through audio power amplifier circuit, and loud speaker is sounded.The audio power amplifier circuit of audio frequency apparatus is most important to audio system, and the design of audio power amplifier circuit tends to influence the effect of television sound system.Audio frequency apparatus is in the moment of start, shutdown, because the coupling of audio frequency power amplifier internal capacitance inductance is easy to generate irregular audio signal output and gives loud speaker, thereby sends impulsive sound.For eliminating the impulsive sound of audio frequency apparatus in start, shutdown moment generation, the general employing in the moment of start, shutdown of audio frequency apparatus makes audio frequency power amplifier be in the method for mute state, and the circuit of realizing this method at present exists circuit structure complexity, cost height, and start, the moment of shutting down can produce very big current impulse, and there is certain hidden danger in reliability.
[summary of the invention]
For addressing the above problem, main purpose of the present invention is to provide a kind of circuit of eliminating the switching on and shutting down impulsive sound, can eliminate the impulsive sound of audio frequency apparatus start, shutdown generation effectively reliably.
For achieving the above object, technical scheme of the present invention is:
A kind of circuit of eliminating the switching on and shutting down impulsive sound comprises power supply and audio frequency power amplifier; Being connected with switching voltage with power supply produces circuit, is connected with start responding to switch circuit and shutdown responding to switch circuit with switching voltage generation circuit; Switching voltage produces circuit provides switching voltage signal with control start responding to switch circuit and shutdown responding to switch circuit; Described start responding to switch circuit is connected to audio frequency power amplifier with the output of shutdown responding to switch circuit, being that audio frequency power amplifier provides mute signal in start or shutdown moment.
Compared to prior art, the circuit that the present invention eliminates the switching on and shutting down impulsive sound removes the control start responding to switch circuit and the responding to switch circuit that shuts down by switching voltage generation circuit output switching voltage signal U1, make start responding to switch circuit export effective mute signal MUTE in the time in start moment and start back one end, make shutdown responding to switch circuit export effective mute signal MUTE in the moment of shutting down, thereby the assurance audio frequency power amplifier is in mute state in start and in start back a period of time with the moment of shutting down, thereby eliminates the startup and shutdown impulsive sound.Effectively eliminate the impulsive sound of audio frequency apparatus start, shutdown generation reliably, circuit cost is low, and advantages of simple is safe and reliable.
[description of drawings]
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
[embodiment]
See also shown in Figure 1, a kind of circuit of eliminating the switching on and shutting down impulsive sound of the present invention, comprising power supply, switching voltage generation circuit, the start responding to switch circuit and the responding to switch circuit that shuts down that are connected with switching voltage generation circuit, be connected in the audio frequency power amplifier of the start responding to switch circuit and the responding to switch circuit output end that shuts down and be connected in power supply. power supply provides+5V voltage, and switching voltage generation circuit provides switching voltage signal U1 to control start responding to switch circuit and to shut down the responding to switch circuit; Start responding to switch circuit provides mute signal MUTE in audio frequency apparatus start moment for audio frequency power amplifier; Shutdown responding to switch circuit provides mute signal MUTE. in audio frequency apparatus shutdown moment for audio frequency power amplifier
Power supply output+5V voltage, this voltage are connected respectively to switching voltage and produce circuit and pull-up resistor R1.After+5V produced processing of circuit through switching voltage, output switching voltage signal U1 removed control start responding to switch circuit and shutdown responding to switch circuit, made start responding to switch circuit export effective mute signal MUTE in the time in start moment and start back one end; Make shutdown responding to switch circuit export effective mute signal MUTE, thereby the assurance audio frequency power amplifier is in mute state in start and in start back a period of time with the moment of shutting down, and eliminates the startup and shutdown impulsive sound in the moment of shutting down.When audio frequency apparatus is started shooting the back operate as normal, start responding to switch circuit and shutdown responding to switch circuit will not influence mute signal MUTE, audio frequency power amplifier operate as normal.
See also shown in Figure 2, switching voltage produces circuit and includes second capacitor C 2 and the 3rd resistance R 3, + 5V power supply is connected to an end of second capacitor C 2, and the other end of second capacitor C 2 is exported switching voltage signal U1 and linked to each other with the 3rd resistance R 3, and the other end of the 3rd resistance R 3 is connected to ground.Start responding to switch circuit includes second resistance R 2 and the first triode Q1, the switching voltage signal U1 of switching voltage generation circuit output is connected to an end of second resistance R 2, the other end of second resistance R 2 is connected to the base stage of the first triode Q1, the emitter of the first triode Q1 is connected to ground, and collector electrode output mute signal MUTE is connected to audio frequency and attacks and put.Shutdown responding to switch circuit includes the 4th resistance R 4, the 5th resistance R 5, the first diode D1, the second triode Q2.Wherein, switching voltage signal U1 is connected to an end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected to the emitter of the second triode Q2, and the base stage of the second triode Q2 is connected to the 5th resistance R 5, and the other end of the 5th resistance R 5 is connected to ground.The collector electrode output mute signal MUTE of the second triode Q2 is connected to audio frequency power amplifier.The end of the first diode D1 links to each other with mute signal MUTE, and the other end is connected to ground.The end of pull-up resistor R1 is connected to mute signal MUTE, other end connection+5V power supply.Go the end of interference capacitors C1 to be connected to mute signal MUTE, the other end is connected to ground.
Audio frequency apparatus is started shooting moment, power supply output+5V voltage.The voltage difference at second capacitor C, 2 two ends is not suddenlyd change, and the switching voltage signal U1 that switching voltage produces circuit output is 5V.The switching voltage signal U1 of 5V makes the first triode Q1 saturation conduction by second resistance R 2, the current collection of the first triode Q1 is low level (about about 0.3V) very, the mute signal MUTE of the responding to switch circuit output low level of promptly starting shooting, making audio frequency power amplifier be in mute state does not have signal output.In start back a period of time, + 5V power supply is by second resistance R 2, the first triode Q1 begins to 2 chargings of electric capacity second capacitor C, voltage difference on second capacitor C 2 rises gradually, switching voltage signal U1 descends gradually, voltage difference on second capacitor C, 2 two ends is about 4.4V, switching voltage signal U1 drops to about 0.6V, switching voltage signal U1 can not make the first triode Q1 conducting after by second resistance R 2, because pull-up resistor R1 one end is connected to+the 5V power supply, another end is connected to the collector electrode of the first triode Q1, the current collection of the first triode Q1 is high level (about about 5V) very, the mute signal MUTE of the responding to switch circuit of promptly starting shooting output high level, audio frequency power amplifier is in normal operating conditions.The first triode Q1 can not conducting after, it be 5V that+5V power supply will continue to the voltage difference of second capacitor C, 2 chargings on second capacitor C 2 by the 3rd resistance R 3, switching voltage signal U1 is 0V.After start moment and start, the second triode Q2 can conducting, and shutdown responding to switch circuit does not influence the state of mute signal MUTE.Second resistance R 2 (examining R1 or R2) guarantees that start moment do not have big current impulse to produce, and the potential pulse that goes interference capacitors C1 can filter start moment guarantees that start moment mute signal MUTE is 0V.
Audio frequency apparatus shuts down moment, power supply output+5V voltage becomes 0V, the voltage difference of second capacitor C 2 is 5V, the voltage difference at second capacitor C, 2 two ends can not be suddenlyd change, the switching voltage signal U1 that switching voltage produces circuit output is connected to the emitter of the second triode Q2 for-5V.-5V switching voltage signal U1 by the 4th resistance R 4, and the base stage of the second triode Q2 is connected to ground by the 5th resistance R 5, the second triode Q2 saturation conduction. behind the second triode Q2 saturation conduction, the first diode D1 is clamped to the collector electrode of the second triode Q2 immediately-0.5V about, the mute signal MUTE of the responding to switch circuit that promptly shuts down output is for about-0.5V, make audio frequency power amplifier be in mute state and do not have signal output. behind the second triode Q2 saturation conduction, second capacitor C 2 is by the first diode D1, the second triode Q2, the 5th resistance R 5, the 4th resistance R 4 and 3 repid discharges of the 3rd resistance R, allowing switch voltage signal U1 become 0V. is very soon shutting down moment, the first triode Q1 can conducting, start responding to switch circuit does not influence the state of mute signal MUTE. and the 4th, the 5th resistance R 4, R5 guarantees that shutdown moment do not have big current impulse to produce, and the clamping action of the first diode D1 guarantees that the voltage of mute signal MUTE can be too not low.
This creation is used to eliminate the circuit of audio frequency apparatus startup and shutdown impulsive sound can eliminate the impulsive sound that the audio frequency apparatus startup and shutdown produce effectively, reliably.Circuit structure is simple, and cost is low, and is safe and reliable.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (5)
1. a circuit of eliminating the switching on and shutting down impulsive sound comprises power supply, audio frequency power amplifier, it is characterized in that: be connected with switching voltage with power supply and produce circuit, be connected with start responding to switch circuit and shutdown responding to switch circuit with switching voltage generation circuit; Switching voltage produces circuit provides switching voltage signal with control start responding to switch circuit and shutdown responding to switch circuit; Described start responding to switch circuit is connected to audio frequency power amplifier with the output of shutdown responding to switch circuit, being that audio frequency power amplifier provides mute signal in start or shutdown moment.
2. the circuit of elimination switching on and shutting down impulsive sound as claimed in claim 1 is characterized in that: also include pull-up resistor (R1) and go interference capacitors (C1); Wherein, an end of pull-up resistor (R1) is connected to mute signal, other end connection+5V power supply, and go an end of interference capacitors (C1) to be connected to mute signal, the other end is connected to ground.
3. the circuit of elimination switching on and shutting down impulsive sound as claimed in claim 2, it is characterized in that: described switching voltage produces circuit and includes second electric capacity (C2) and the 3rd resistance (R3), + 5V power supply is connected to an end of second electric capacity (C2), the other end of second electric capacity (C2) is exported switching voltage signal (U1) and is connected to ground with the other end of the 3rd resistance (R3) (linking to each other the 3rd resistance R 3).
4. the circuit of elimination switching on and shutting down impulsive sound as claimed in claim 3, it is characterized in that: described start responding to switch circuit includes second resistance (R2) and first triode (Q1), the switching voltage signal (U1) of switching voltage generation circuit output is connected to an end of second resistance (R2), the other end of second resistance (R2) is connected to the base stage of first triode (Q1), the emitter of first triode (Q1) is connected to ground, and collector electrode output mute signal MUTE is connected to audio frequency power amplifier.
5. the circuit of elimination switching on and shutting down impulsive sound as claimed in claim 4 is characterized in that: described shutdown responding to switch circuit includes the 4th resistance (R4), the 5th resistance (R5), first diode (D1), second triode (Q2); Wherein, switching voltage signal (U1) is connected to an end of the 4th resistance (R4), the other end of the 4th resistance (R4) is connected to the emitter of second triode (Q2), and the base stage of second triode (Q2) is connected to the 5th resistance (R5), and collector electrode output mute signal MUTE is connected to audio frequency power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910110236 CN101707477B (en) | 2009-10-23 | 2009-10-23 | Circuit for eliminating impact sound generated in switching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910110236 CN101707477B (en) | 2009-10-23 | 2009-10-23 | Circuit for eliminating impact sound generated in switching process |
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| CN101707477A true CN101707477A (en) | 2010-05-12 |
| CN101707477B CN101707477B (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910110236 Active CN101707477B (en) | 2009-10-23 | 2009-10-23 | Circuit for eliminating impact sound generated in switching process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159178A (en) * | 2014-07-22 | 2014-11-19 | 歌尔声学股份有限公司 | Noise elimination circuit and noise elimination method for audio frequency device |
| CN104469622A (en) * | 2014-12-19 | 2015-03-25 | 北京卓越信通电子股份有限公司 | Circuit for eliminating power amplification impact sound |
| CN109862467A (en) * | 2017-11-30 | 2019-06-07 | 深圳市冠旭电子股份有限公司 | A kind of power amplifier and sound equipment applied to sound equipment |
| CN110602604A (en) * | 2019-09-24 | 2019-12-20 | 先歌国际影音有限公司 | Circuit for eliminating impact sound of power amplifier switch of TPA3116 series |
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
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| CN1767607A (en) * | 2005-09-27 | 2006-05-03 | 深圳创维－Rgb电子有限公司 | Mute circuit for open and close |
| CN201001105Y (en) * | 2007-01-12 | 2008-01-02 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound of shut-down |
| CN201039106Y (en) * | 2007-04-03 | 2008-03-19 | 青岛海信电器股份有限公司 | Shutdown silence circuit |
| CN201282521Y (en) * | 2008-11-04 | 2009-07-29 | 青岛海信电器股份有限公司 | Silent circuit for opening/closing computer and television set with the same |
| CN101527543A (en) * | 2008-03-06 | 2009-09-09 | 原景科技股份有限公司 | Audio system capable of suppressing switch noise and audio amplifier |
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2009
- 2009-10-23 CN CN 200910110236 patent/CN101707477B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1767607A (en) * | 2005-09-27 | 2006-05-03 | 深圳创维－Rgb电子有限公司 | Mute circuit for open and close |
| CN201001105Y (en) * | 2007-01-12 | 2008-01-02 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound of shut-down |
| CN201039106Y (en) * | 2007-04-03 | 2008-03-19 | 青岛海信电器股份有限公司 | Shutdown silence circuit |
| CN101527543A (en) * | 2008-03-06 | 2009-09-09 | 原景科技股份有限公司 | Audio system capable of suppressing switch noise and audio amplifier |
| CN201282521Y (en) * | 2008-11-04 | 2009-07-29 | 青岛海信电器股份有限公司 | Silent circuit for opening/closing computer and television set with the same |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159178A (en) * | 2014-07-22 | 2014-11-19 | 歌尔声学股份有限公司 | Noise elimination circuit and noise elimination method for audio frequency device |
| CN104159178B (en) * | 2014-07-22 | 2017-12-19 | 歌尔股份有限公司 | The noise canceller circuit and noise cancellation method of a kind of audio devices |
| CN104469622A (en) * | 2014-12-19 | 2015-03-25 | 北京卓越信通电子股份有限公司 | Circuit for eliminating power amplification impact sound |
| CN104469622B (en) * | 2014-12-19 | 2017-11-14 | 北京卓越信通电子股份有限公司 | A kind of circuit for eliminating power amplifier impulsive sound |
| CN109862467A (en) * | 2017-11-30 | 2019-06-07 | 深圳市冠旭电子股份有限公司 | A kind of power amplifier and sound equipment applied to sound equipment |
| CN110602604A (en) * | 2019-09-24 | 2019-12-20 | 先歌国际影音有限公司 | Circuit for eliminating impact sound of power amplifier switch of TPA3116 series |
| CN110602604B (en) * | 2019-09-24 | 2024-04-16 | 先歌国际影音股份有限公司 | Circuit for eliminating power on/off impact sound of TPA3116 series power amplifier |
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
| CN110677778B (en) * | 2019-10-10 | 2020-12-18 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
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| Publication number | Publication date |
|---|---|
| CN101707477B (en) | 2013-09-25 |
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