CN201898599U - Circuit capable of eliminating POP noise and mobile terminal - Google Patents
Circuit capable of eliminating POP noise and mobile terminal Download PDFInfo
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- CN201898599U CN201898599U CN2010206342315U CN201020634231U CN201898599U CN 201898599 U CN201898599 U CN 201898599U CN 2010206342315 U CN2010206342315 U CN 2010206342315U CN 201020634231 U CN201020634231 U CN 201020634231U CN 201898599 U CN201898599 U CN 201898599U
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Abstract
The utility model is suitable for the technical field of audio circuits and provides a circuit capable of eliminating POP noises and a mobile terminal. In the embodiment of the utility model, when an audio device is energized and de-energized instantly and signals are stable after the audio device is energized, sharp pulses which cause the POP noises are generated at an audio input end. An analog switch in the circuit capable of eliminating the POP noises can lead the sharp pulses to the ground and can connect the audio input end to a horn after the signals are stable. By using a principle that a DC blocking capacitor does not discharge at the moment of switching, voltage at the end of the horn is always stable. Thereby, the POP noises at the end of the horn can be effectively eliminated. The circuit capable of eliminating the POP noises has the advantages that the structure is simple, the cost is low, the power consumption is not increased and unnecessary interfering noises and signal distortion are not caused.
Description
Technical field
The utility model belongs to the voicefrequency circuit technical field, relates in particular to a kind of circuit and portable terminal of the POP of elimination noise.
Background technology
The POP noise be meant audio parts power on, cut off the power supply moment and power on stable after, carry out the explosion sound that transient impact caused that various operations bring.
The scheme of removing the POP noise at present mainly contains following several: first kind is the method that adopts zero offset, audio frequency power amplifier internal charge pump (charge pump) produces+/-voltage of 1.8V, the bias voltage that makes output is 0V, like this power on, cut off the power supply moment and power on stable after, the transient impact that can bring not, this method can be eliminated the POP noise effectively; Second kind is the filter capacitor that increases VBIAS, and the filter capacitor that increases VBIAS can slow down rising, the decrease speed of DC reference voltage, plays the effect that reduces the POP noise, but can not eliminate completely, and tonequality is had certain influence.The third is to add clamped voltage method, promptly add one and the equal clamped voltage of bias voltage at loudspeaker capacitance front end, can offset like this because of the audio parts transient impact that moment brings that powers on, cuts off the power supply, the voltage of trumpet end is stable always, but still produce the POP noise in the moment of starting shooting, and the POP noise of other scenes can be removed effectively.
But there is following defective in existing scheme:
First method can be removed the POP noise effectively, but circuit is too complicated, cost is too high, adopts charge pump (charge pump) pattern itself to cause interference easily;
Second method can not be eliminated the POP noise up hill and dale, and filter capacitor is crossed conference makes the settling time of chip elongated, makes the not output for a long time of people's perceived sounds.In addition, the excessive important indicator that also can make audio system of electric capacity---total harmonic distortion+noise (THD+N) variation.
The third method can not be eliminated the start POP noise of moment, and owing to will provide clamped voltage can increase power consumption always.
The utility model content
The purpose of the utility model embodiment is to provide a kind of circuit of the POP of elimination noise, and the circuit that is intended to solve existing elimination POP noise exists with high costs, and exists and increase power consumption, introduce the unnecessary interfering noise and the problem of distorted signals.
The utility model embodiment is achieved in that a kind of circuit of the POP of elimination noise, and the circuit of described elimination POP noise comprises:
Audio input end, capacitance, analog switch and loudspeaker;
Described analog switch comprises first output, second output and the input that can flexibly connect with described first output or second output, described input connects audio input end by capacitance, the described first output termination loudspeaker, described second output head grounding.
In the said structure, described audio input end comprises L channel audio input end and right audio channel input.
In the said structure, described capacitance comprises first capacitance and second capacitance, the first termination L channel audio input end of described first capacitance, the first termination right audio channel input of described second capacitance.
In the said structure, described analog switch comprises first analog switch and second analog switch, described loudspeaker comprise left horn and right horn, second end of input termination first capacitance of described first analog switch, the first output termination left horn of described first analog switch, second output head grounding of described first analog switch, second end of input termination second capacitance of described second analog switch, the first output termination right horn of described second analog switch, second output head grounding of described second analog switch.
In the said structure, described first analog switch is a single-pole double-throw switch (SPDT).
In the said structure, first contact of described single-pole double-throw switch (SPDT) is the input of first analog switch, second contact of described single-pole double-throw switch (SPDT) and the 3rd contact are respectively first output and second output of first analog switch, described single-pole double-throw switch (SPDT) also comprises the control end of plug-in strip and input control signal, and described plug-in strip flexibly connects first contact and second contact or the 3rd contact under the control of described control signal.
In the said structure, described second analog switch is a single-pole double-throw switch (SPDT).
In the said structure, first contact of described single-pole double-throw switch (SPDT) is the input of second analog switch, second contact of described single-pole double-throw switch (SPDT) and the 3rd contact are respectively first output and second output of second analog switch, described single-pole double-throw switch (SPDT) also comprises the control end of plug-in strip and input control signal, and described plug-in strip flexibly connects first contact and second contact or the 3rd contact under the control of described control signal.
Another purpose of the utility model embodiment is to provide a kind of portable terminal that comprises the circuit of above-mentioned elimination POP noise.
In the said structure, described portable terminal is communication terminal, MP3, MP4 or PDA.
Among the utility model embodiment, when audio parts is powering on, outage moment and power on stable after, can produce the spike that causes the POP noise to occur at audio input end, analog switch in the circuit of this elimination POP noise is led this spike on the ground, by the time behind the signal stabilization, analog switch is received audio input end on the loudspeaker again, the principle of utilizing capacitance can not discharge in the moment of switching, so the voltage of trumpet end is stable always, so just can remove the POP noise of trumpet end effectively, this circuit structure of eliminating the POP noise is simple, with low cost, and can not increase power consumption, can not introduce unnecessary interfering noise and distorted signals yet.
Description of drawings
Fig. 1 is the structure chart of the circuit of the elimination POP noise that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The circuit of eliminating the POP noise comprises:
Audio input end, capacitance, analog switch and loudspeaker;
Analog switch comprises first output, second output and the input that can flexibly connect with first output or second output, and input connects audio input end by capacitance, the first output termination loudspeaker, second output head grounding.
Fig. 1 is the structural representation of the circuit of the elimination POP noise that provides of the utility model embodiment.
As the utility model one embodiment, audio input end comprises L channel audio input end 100 and right audio channel input 200.
As the utility model one embodiment, capacitance comprises the first capacitance C1 and the second capacitance C2, the first termination right audio channel input 200 of the first termination L channel audio input end, 100, the second capacitance C2 of the first capacitance C1.
As the utility model one embodiment, analog switch comprises first analog switch 500 and second analog switch 600, loudspeaker comprise left horn 300 and right horn 400, second end of the input termination first capacitance C1 of first analog switch 500, the first output termination left horn 300 of first analog switch 500, second output head grounding of first analog switch 500, second end of the input termination second capacitance C2 of second analog switch 600, second output head grounding of the first output termination right horn, 400, the second analog switches 600 of second analog switch 600.
As the utility model one embodiment, first analog switch 500 is single-pole double-throw switch (SPDT) K1.
As the utility model one embodiment, first contact 1 of single-pole double-throw switch (SPDT) K1 is the input of first analog switch 500, second contact 2 of single-pole double-throw switch (SPDT) K1 and the 3rd contact 3 are respectively first output and second output of first analog switch 500, single-pole double-throw switch (SPDT) K1 also comprises the control end 4 of plug-in strip and input control signal EN, plug-in strip flexibly connects first contact 1 and second contact 2 or the 3rd contact 3 under the control of control signal EN, so that L channel audio input end 100 and left horn 300 are connected, perhaps L channel audio input end 100 and ground are connected.
As the utility model one embodiment, second analog switch 600 is single-pole double-throw switch (SPDT) K2.
As the utility model one embodiment, first contact 1 of single-pole double-throw switch (SPDT) K2 is the input of second analog switch 600, second contact 2 of single-pole double-throw switch (SPDT) K2 and the 3rd contact 3 are respectively first output and second output of the second analog switch K2, single-pole double-throw switch (SPDT) K2 also comprises the control end 4 of plug-in strip and input control signal EN, plug-in strip flexibly connects first contact 1 and second contact 2 or the 3rd contact 3 under the control of control signal EN, so that right audio channel input 200 and right horn 400 are connected, perhaps right audio channel input 200 and ground are connected.
Single-pole double-throw switch (SPDT) K1 and single-pole double-throw switch (SPDT) K2 are except automatically flexibly connecting first contact 1 and second contact 2 or the 3rd contact 3 under the control of control signal EN, as the utility model one embodiment, can also be by manual mode with first contact 1 and second contact 2 or 3 flexible connections of the 3rd contact.
This circuit is aspect electrostatic protection; can play the effect of protection audio parts, because when not listening to the music, audio input end is to receive on the ground; this moment, loudspeaker and audio parts were in isolation, can avoid like this burning audio parts because of the static that trumpet end is introduced.
The utility model embodiment also provides a kind of portable terminal that comprises the circuit of above-mentioned elimination POP noise.
As the utility model one embodiment, portable terminal is communication terminal, MP3, MP4 or PDA.
Among the utility model embodiment, when audio parts is powering on, outage moment and power on stable after, can produce the spike that causes the POP noise to occur at audio input end, analog switch in the circuit of this elimination POP noise is led this spike on the ground, by the time behind the signal stabilization, analog switch is received audio input end on the loudspeaker again, the principle of utilizing capacitance can not discharge in the moment of switching, so the voltage of trumpet end is stable always, so just can remove the POP noise of trumpet end effectively, this circuit structure of eliminating the POP noise is simple, with low cost, and can not increase power consumption, can not introduce unnecessary interfering noise and distorted signals yet.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. a circuit of eliminating the POP noise is characterized in that, the circuit of described elimination POP noise comprises:
Audio input end, capacitance, analog switch and loudspeaker;
Described analog switch comprises first output, second output and the input that can flexibly connect with described first output or second output, described input connects audio input end by capacitance, the described first output termination loudspeaker, described second output head grounding.
2. the circuit of elimination POP noise as claimed in claim 1 is characterized in that described audio input end comprises L channel audio input end and right audio channel input.
3. the circuit of elimination POP noise as claimed in claim 2, it is characterized in that, described capacitance comprises first capacitance and second capacitance, the first termination L channel audio input end of described first capacitance, the first termination right audio channel input of described second capacitance.
4. the circuit of elimination POP noise as claimed in claim 3, it is characterized in that, described analog switch comprises first analog switch and second analog switch, described loudspeaker comprise left horn and right horn, second end of input termination first capacitance of described first analog switch, the first output termination left horn of described first analog switch, second output head grounding of described first analog switch, second end of input termination second capacitance of described second analog switch, the first output termination right horn of described second analog switch, second output head grounding of described second analog switch.
5. the circuit of elimination POP noise as claimed in claim 4 is characterized in that described first analog switch is a single-pole double-throw switch (SPDT).
6. the circuit of elimination POP noise as claimed in claim 5, it is characterized in that, first contact of described single-pole double-throw switch (SPDT) is the input of first analog switch, second contact of described single-pole double-throw switch (SPDT) and the 3rd contact are respectively first output and second output of first analog switch, described single-pole double-throw switch (SPDT) also comprises the control end of plug-in strip and input control signal, and described plug-in strip flexibly connects first contact and second contact or the 3rd contact under the control of described control signal.
7. the circuit of elimination POP noise as claimed in claim 4 is characterized in that described second analog switch is a single-pole double-throw switch (SPDT).
8. the circuit of elimination POP noise as claimed in claim 7, it is characterized in that, first contact of described single-pole double-throw switch (SPDT) is the input of second analog switch, second contact of described single-pole double-throw switch (SPDT) and the 3rd contact are respectively first output and second output of second analog switch, described single-pole double-throw switch (SPDT) also comprises the control end of plug-in strip and input control signal, and described plug-in strip flexibly connects first contact and second contact or the 3rd contact under the control of described control signal.
9. a portable terminal is characterized in that, described portable terminal comprises the circuit as each described elimination POP noise of claim 1-8.
10. portable terminal as claimed in claim 9 is characterized in that, described portable terminal is communication terminal, MP3, MP4 or PDA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206342315U CN201898599U (en) | 2010-11-30 | 2010-11-30 | Circuit capable of eliminating POP noise and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206342315U CN201898599U (en) | 2010-11-30 | 2010-11-30 | Circuit capable of eliminating POP noise and mobile terminal |
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| Publication Number | Publication Date |
|---|---|
| CN201898599U true CN201898599U (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206342315U Expired - Lifetime CN201898599U (en) | 2010-11-30 | 2010-11-30 | Circuit capable of eliminating POP noise and mobile terminal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102905212A (en) * | 2011-07-25 | 2013-01-30 | 冠捷投资有限公司 | Anti-sonic boom display device and audio signal processing device |
| CN104363547A (en) * | 2014-12-04 | 2015-02-18 | 青岛歌尔声学科技有限公司 | Audio processing circuit for eliminating plug-in noise of earphone and line control earphone |
| CN106412769A (en) * | 2015-07-31 | 2017-02-15 | 展讯通信（上海）有限公司 | Circuit and method for reducing audio noise |
| CN106412748A (en) * | 2016-11-08 | 2017-02-15 | 歌尔科技有限公司 | Device and method for eliminating Pop sound of earphone |
| CN107835476A (en) * | 2017-11-08 | 2018-03-23 | 上海耀华称重***有限公司 | POP noise canceller circuits |
| CN108989948A (en) * | 2018-08-08 | 2018-12-11 | 福建科立讯通信有限公司 | A kind of the voice-grade channel switching realization circuit and method of digital walkie-talkie |
| CN111263268A (en) * | 2020-01-15 | 2020-06-09 | 深圳市创维群欣安防科技股份有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
-
2010
- 2010-11-30 CN CN2010206342315U patent/CN201898599U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102905212A (en) * | 2011-07-25 | 2013-01-30 | 冠捷投资有限公司 | Anti-sonic boom display device and audio signal processing device |
| CN104363547A (en) * | 2014-12-04 | 2015-02-18 | 青岛歌尔声学科技有限公司 | Audio processing circuit for eliminating plug-in noise of earphone and line control earphone |
| WO2016086805A1 (en) * | 2014-12-04 | 2016-06-09 | 青岛歌尔声学科技有限公司 | Audio processing circuit for eliminating plug-in and plug-out noise of earphone, and line control earphone |
| CN104363547B (en) * | 2014-12-04 | 2017-09-26 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and line control earphone for eliminating headset plugging noise |
| CN106412769A (en) * | 2015-07-31 | 2017-02-15 | 展讯通信（上海）有限公司 | Circuit and method for reducing audio noise |
| CN106412748A (en) * | 2016-11-08 | 2017-02-15 | 歌尔科技有限公司 | Device and method for eliminating Pop sound of earphone |
| CN106412748B (en) * | 2016-11-08 | 2024-04-09 | 歌尔科技有限公司 | Device and method for eliminating earphone plosive |
| CN107835476A (en) * | 2017-11-08 | 2018-03-23 | 上海耀华称重***有限公司 | POP noise canceller circuits |
| CN108989948A (en) * | 2018-08-08 | 2018-12-11 | 福建科立讯通信有限公司 | A kind of the voice-grade channel switching realization circuit and method of digital walkie-talkie |
| CN108989948B (en) * | 2018-08-08 | 2024-03-08 | 福建科立讯通信有限公司 | Audio channel switching realization circuit and method for digital interphone |
| CN111263268A (en) * | 2020-01-15 | 2020-06-09 | 深圳市创维群欣安防科技股份有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110713 |