CN204031429U - Eliminate the circuit of pop noise - Google Patents
Eliminate the circuit of pop noise Download PDFInfo
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- CN204031429U CN204031429U CN201420338627.3U CN201420338627U CN204031429U CN 204031429 U CN204031429 U CN 204031429U CN 201420338627 U CN201420338627 U CN 201420338627U CN 204031429 U CN204031429 U CN 204031429U
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Abstract
The circuit that the utility model discloses a kind of pop of elimination noise, comprising: audio frequency input module, and the first input end of audio frequency input module is connected with L channel output with the R channel output of audio decoder chip respectively with the second input; Switch module, the first input end of switch module is connected with the second output with the first output of audio frequency input module respectively with the second input; Drive signal generation module, drive signal generation module to be connected with the control end of switch module; Audio frequency output module, audio frequency output module comprises the 7th resistance and the 8th resistance, one end of the 7th resistance and the 8th resistance is connected with the second output with the first output of switch module respectively, and the other end of the 7th resistance and the 8th resistance is connected with left horn with the right horn of loudspeaker respectively.This circuit of eliminating pop noise can, when audio decoder chip power and power down, drive signal to carry out cut-off switch module by driving signal generation module to generate first, thereby prevent from exporting pop noise.
Description
Technical field
The utility model relates to Audiotechnica field, particularly a kind of circuit of eliminating pop noise.Background technology
Pop noise refers to audio frequency amplifier in powered on moment, power-off moment and powering on after stable it is carried out to various operational example while switching as standby, and power supply perhaps exports to input capacitance, biased electrical the explosion sound that the instantaneous charging of capacitance produces.Because power supply produces peak voltage as shown in Figure 1 to tending in the instantaneous charging process of electric capacity at the output of audio frequency amplifier, this peak voltage can generate electric current cutting magnetic line while being added in earphone or loud speaker two ends, thereby generation active force, make loud speaker send Pop-click noise, in having applied electronic product such as the computer of audio frequency amplifier, mobile phone, music player etc., this noise has inevitably reduced user's experience sense.
Summary of the invention
The purpose of this utility model is intended to solve at least to a certain extent one of above-mentioned technical problem.
For this reason, an object of the present utility model is to propose a kind of circuit of the pop of elimination noise, and the circuit of this elimination pop noise can prevent from exporting pop noise, improves user's experience sense.
For achieving the above object, the utility model has proposed a kind of circuit of the pop of elimination noise on the one hand, the circuit of this elimination pop noise comprises: audio frequency input module, and the first input end of described audio frequency input module is connected with L channel output with the R channel output of audio decoder chip respectively with the second input; Switch module, the first input end of described switch module is connected with the second output with the first output of described audio frequency input module respectively with the second input; Drive signal generation module, described driving signal generation module is connected with the control end of described switch module, described driving signal generation module is for obtaining the state of described audio decoder chip, and when the state of described audio decoder chip is for powering on and during power down, generating first and drive signal to disconnect described switch module; With audio frequency output module, described audio frequency output module comprises the 7th resistance and the 8th resistance, and one end of described the 7th resistance is connected with the first output of described switch module, and the 7th other end of resistance and the right horn of loudspeaker are connected; One end of described the 8th resistance is connected with the second output of described switch module, and the 8th other end of resistance and the left horn of loudspeaker are connected.
The circuit of the elimination pop noise the utility model proposes can drive signal to carry out cut-off switch module by driving signal generation module to generate first, thereby prevent from exporting pop noise when audio decoder chip power and power down, has greatly improved user's experience sense.
Further, described switch module comprises: the first switch submodule, and the first end of described the first switch submodule is connected with the first output of described audio frequency input module, and the control end of described the first switch submodule is connected with described driving signal generation module; Second switch submodule, the first end of described second switch submodule is connected with the second end of described the first switch submodule, and the control end of described second switch submodule is connected with described driving signal generation module; The 3rd switch submodule, the first end of described the 3rd switch submodule is connected with the second output of described audio frequency input module, and the control end of described the 3rd switch submodule is connected with described driving signal generation module; With the 4th switch submodule, the first end of described the 4th switch submodule is connected with the second end of described the 3rd switch submodule, and the control end of described the 4th switch submodule is connected with described driving signal generation module.
Further, described driving signal generation module comprises: drive signal to generate submodule; The first resistance, one end of described the first resistance is connected with the output that described driving signal generates submodule, and the other end of described the first resistance is connected with the control end of described the 4th switch submodule with the control end of described the first switch submodule, the control end of the control end of described second switch submodule, described the 3rd switch submodule respectively; With the second resistance, one end of described the second resistance is connected with the other end of described the first resistance, the other end ground connection of described the second resistance.
Further, described the first switch submodule comprises: the 3rd resistance, and one end of described the 3rd resistance is connected with the first output of described audio frequency input module, the other end ground connection of described the 3rd resistance; With the first switching tube, the first end of described the first switching tube is connected with one end of described the 3rd resistance, and the control end of described the first switching tube is connected with the other end of described the first resistance.
Further, described second switch submodule comprises: the 4th resistance, and one end of described the 4th resistance is connected with the second end of described the first switching tube, the other end ground connection of described the 4th resistance; With second switch pipe, the first end of described second switch pipe is connected with one end of described the 4th resistance, the control end of described second switch pipe is connected with the other end of described the first resistance, and the second end of described second switch pipe is as the output of described second switch submodule.
Further, described the 3rd switch submodule comprises: the 5th resistance, and one end of described the 5th resistance is connected with the second output of described audio frequency input module, the other end ground connection of described the 5th resistance; With the 3rd switching tube, the first end of described the 3rd switching tube is connected with one end of described the 5th resistance, and the control end of described the 3rd switching tube is connected with the other end of described the first resistance.
Further, described the 4th switch submodule comprises: the 6th resistance, and one end of described the 6th resistance is connected with the second end of described the 3rd switching tube, the other end ground connection of described the 6th resistance; With the 4th switching tube, the first end of described the 4th switching tube is connected with one end of described the 6th resistance, the control end of described the 4th switching tube is connected with the other end of described the first resistance, and the second end of described the 4th switching tube is as the output of described the 4th switch submodule.
Further, described the first switching tube, described second switch pipe, described the 3rd switching tube and described the 4th switching tube are N-channel MOS FET(Metal-Oxide-Semiconductor Field-Effect Transistor, metal oxide semiconductcor field effect transistor).
The aspect that the utility model is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
The waveform schematic diagram that Fig. 1 is power supply to the peak voltage producing at the output of audio frequency amplifier in the instantaneous charging process of electric capacity;
Fig. 2 is according to the block diagram of the circuit of the elimination pop noise of the utility model embodiment;
Fig. 3 is according to the structural representation of the circuit of the elimination pop noise of an embodiment of the utility model; With
Fig. 4 is according to the structural representation of the first switching tube of the circuit of the elimination pop noise of an embodiment of the utility model, second switch pipe, the 3rd switching tube and the 4th switching tube.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are for the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.
In description of the present utility model, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
The circuit of the elimination pop noise proposing according to the utility model embodiment is described with reference to the accompanying drawings.
As shown in Figure 2,3, the circuit 1 of the elimination pop noise of the utility model embodiment comprises: audio frequency input module 10, switch module 20, driving signal generation module 30 and audio frequency output module 40.Wherein, the first input end of audio frequency input module 10 is connected with L channel output HP_OUT_L with the R channel output HP_OUT_R of audio decoder chip 50 respectively with the second input.The first input end of switch module 20 is connected with the second output with the first output of audio frequency input module 10 respectively with the second input.Drive signal generation module 30 to be connected with the control end of switch module 20, drive signal generation module 30 for obtaining the state of audio decoder chip 50, and when the state of audio decoder chip 50 is for powering on and during power down, generating first and drive signal with cut-off switch module 20.Described audio frequency output module 40 comprises the 7th resistance R 7 and the 8th resistance R 8, and one end of described the 7th resistance R 7 is connected with the first output of described switch module 20, and the other end of the 7th resistance R 7 is connected with the right horn 61 of described loudspeaker 60; One end of described the 8th resistance R 8 is connected with the second output of described switch module 20, and the other end of the 8th resistance R 8 is connected with the left horn 62 of described loudspeaker 60.It should be noted that, when the state of audio decoder chip 50 is for powering on and during power down, audio decoder chip 50 produces pop noise, but drive signal that switch module 20 is disconnected owing to driving signal generation module 30 to generate first, now, the pop noise that audio decoder chip 50 produces can not export loudspeaker to.
Further, in an embodiment of the present utility model, drive signal generation module 30 to drive signal for example after low level pulse Preset Time generating first, also generate two driving signal for example high level pulse with closing switch module 20, loudspeaker are exported normal audio signal, and Preset Time is more than or equal to power-on time and the power down time of audio decoder chip 50.
Further, as shown in Figure 3, in an embodiment of the present utility model, switch module 20 comprises: the first switch submodule 21, second switch submodule 22, the 3rd switch submodule 23 and the 4th switch submodule 24.Wherein, the first end of the first switch submodule 21 is connected with the first output of audio frequency input module 10, and the control end of the first switch submodule 21 is connected with driving signal generation module 30.The first end of second switch submodule 22 is connected with the second end of the first switch submodule 21, and the control end of second switch submodule 22 is connected with driving signal generation module 30.The first end of the 3rd switch submodule 23 is connected with the second output of audio frequency input module 10, and the control end of the 3rd switch submodule 23 is connected with driving signal generation module 30.The first end of the 4th switch submodule 24 is connected with the second end of the 3rd switch submodule 23, and the control end of the 4th switch submodule 24 is connected with driving signal generation module 30.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, drive signal generation module 30 to comprise: to drive signal to generate submodule 31, the first resistance R 1 and the second resistance R 2.Wherein, drive signal to generate submodule 31 for obtaining the state of audio decoder chip 50, and when the state of audio decoder chip 50 is for powering on and during power down, generating first drives signal with cut-off switch module 20, and after generating the first driving signal Preset Time, generate two driving signal with closing switch module 20.One end of the first resistance R 1 is connected with the output GPIO_EN that drives signal to generate submodule 31, and the other end of the first resistance R 1 is connected with the control end of the 4th switch submodule 24 with the control end of the first switch submodule 21, the control end of the control end of second switch submodule 22, the 3rd switch submodule 23 respectively.One end of the second resistance R 2 is connected with the other end of the first resistance R 1, the other end ground connection of the second resistance R 2.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, the first switch submodule 21 comprises: the 3rd resistance R 3 and the first switching tube Q1.Wherein, one end of the 3rd resistance R 3 is connected with the first output of audio frequency input module 10, the other end ground connection of the 3rd resistance R 3.The first end of the first switching tube Q1 is connected with one end of the 3rd resistance R 3, and the control end of the first switching tube Q1 is connected with the other end of the first resistance R 1.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, second switch submodule 22 comprises: the 4th resistance R 4 and second switch pipe Q2.Wherein, one end of the 4th resistance R 4 is connected with the second end of the first switching tube Q1, the other end ground connection of the 4th resistance R 4.The first end of second switch pipe Q2 is connected with one end of the 4th resistance R 4, and the control end of second switch pipe Q2 is connected with the other end of the first resistance R 1, and the second end of second switch pipe Q2 is as the output of second switch submodule 22.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, the 3rd switch submodule 23 comprises: the 5th resistance R 5 and the 3rd switching tube Q3.Wherein, one end of the 5th resistance R 5 is connected with the second output of audio frequency input module 10, the other end ground connection of the 5th resistance R 5.The first end of the 3rd switching tube Q3 is connected with one end of the 5th resistance R 5, and the control end of the 3rd switching tube Q3 is connected with the other end of the first resistance R 1.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, the 4th switch submodule 24 comprises: the 6th resistance R 6 and the 4th switching tube Q4.Wherein, one end of the 6th resistance R 6 is connected with the second end of the 3rd switching tube Q3, the other end ground connection of the 6th resistance R 6.The first end of the 4th switching tube Q4 is connected with one end of the 6th resistance R 6, and the control end of the 4th switching tube Q4 is connected with the other end of the first resistance R 1, and the second end of the 4th switching tube Q4 is as the output of the 4th switch submodule 24.
Further, in an embodiment of the present utility model, the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4 can be N-channel MOS FET.Particularly, the structure of N-channel MOS FET as shown in Figure 4.In Fig. 4, the D1 of PN junction back-to-back between N-channel MOS FET internal gate and source electrode increases special process step to produce, be mainly used in improving the antistatic effect of N-channel MOS FET, parasitic diode D between drain electrode and source electrode is because substrate and source electrode are by self-assembling formation after source metal short circuit, do not need to increase special process step, generally there is parasitic diode D in existing MOSFET, this parasitic diode D can also play the effect of fly-wheel diode in some practical application.
Particularly, as shown in Figure 3, in an embodiment of the present utility model, one end of the 7th resistance R 7 is connected with the output of second switch submodule 22, and the other end of the 7th resistance R 7 is connected with the right horn 61 of loudspeaker 60.One end of the 8th resistance R 8 is connected with the output of the 4th switch submodule 24, and the other end of the 8th resistance R 8 is connected with the left horn 62 of loudspeaker 60.
In a specific embodiment of the present utility model, the circuit 1 of elimination pop noise is as shown in Figure 3 applied to music player that can plugged earphone, the state that driving signal generation submodule 31 in driving signal generation module 30 obtains audio decoder chip 50 is to power on for example to insert earphone, carry out button operation, standby wakeup, after plugged earphone, start shooting, while switching song etc., for example pull out earphone with power down, when after plugged earphone, shutdown waits, although now audio decoder chip 50 has produced pop noise, but drive signal to make the first switching tube Q1 owing to driving signal to generate first of submodule 31 generations, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4 disconnect i.e. cut-off, pop noise can not export loudspeaker to, user experiences less than ear-piercing pop noise at earphone end, experience sense improves greatly.Wherein, while shutting down after plugged earphone, drive signal generation submodule 31 can generate in advance the first driving signal and disconnect the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4, thereby prevent from exporting the pop noise that in shutdown process, on path, electric capacity sparks and brings.
Further, when driving signal to generate submodule 31 to generate two driving signals and the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4 are closed be conducting, the normal audio signal of audio decoder chip 50 outputs will export loudspeaker to, and user can experience melodious music or normal keypad tone at earphone end.Wherein, when by broadcasting button or switching song, drive signal to generate submodule 31 and can after player outputting music signal, postpone several milliseconds of regeneration two driving signals, the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4 are closed, thereby export normal music signal to earphone end.
The circuit of the elimination pop noise the utility model proposes can be when audio decoder chip power and power down, by driving signal generation module to generate first, drive signal to carry out cut-off switch module, thereby prevent from exporting pop noise, and after generating the first driving signal Preset Time, also generate two driving signal with closing switch module, make the normal audio signal of audio decoder chip output export loudspeaker to.The circuit of this elimination pop noise not only can be eliminated the pop noise that various audio decoder chips produce, greatly improve user's experience sense, and to driving signal to generate the not restriction of model of submodule, loudspeaker or earphone, easy to use, compatible strong, flexibility is high, and simple in structure, printed circuit board area is little, and cost is low.
In flow chart or any process of otherwise describing at this or method describe and can be understood to, represent to comprise that one or more is for realizing the module of code of executable instruction of the step of specific logical function or process, fragment or part, and the scope of preferred implementation of the present utility model comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiment person of ordinary skill in the field of the present utility model.
The logic and/or the step that in flow chart, represent or otherwise describe at this, for example, can be considered to for realizing the sequencing list of the executable instruction of logic function, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise that the system of processor or other can and carry out the system of instruction from instruction execution system, device or equipment instruction fetch), use, or use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can comprise, storage, communication, propagation or transmission procedure be for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically of computer-readable medium (non-exhaustive list) comprises following: the electrical connection section (electronic installation) with one or more wirings, portable computer diskette box (magnetic device), random-access memory (ram), read-only memory (ROM), the erasable read-only memory (EPROM or flash memory) of editing, fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other the suitable medium that can print described program thereon, because can be for example by paper or other media be carried out to optical scanner, then edit, decipher or process in electronics mode and obtain described program with other suitable methods if desired, be then stored in computer storage.
Should be appreciated that each several part of the present utility model can realize with hardware, software, firmware or their combination.In the above-described embodiment, a plurality of steps or method can realize with being stored in memory and by software or the firmware of suitable instruction execution system execution.For example, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: have for data-signal being realized to the discrete logic of the logic gates of logic function, the application-specific integrated circuit (ASIC) with suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is to come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium, this program, when carrying out, comprises step of embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the utility model can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module usings that the form of software function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that in the situation that not departing from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is by claims and be equal to and limit.
Claims (8)
1. a circuit of eliminating pop noise, is characterized in that, comprising:
Audio frequency input module, the first input end of described audio frequency input module is connected with L channel output with the R channel output of audio decoder chip respectively with the second input;
Switch module, the first input end of described switch module is connected with the second output with the first output of described audio frequency input module respectively with the second input;
Drive signal generation module, described driving signal generation module is connected with the control end of described switch module, described driving signal generation module is for obtaining the state of described audio decoder chip, and when the state of described audio decoder chip is for powering on and during power down, generating first and drive signal to disconnect described switch module; With
Audio frequency output module, described audio frequency output module comprises the 7th resistance and the 8th resistance, and one end of described the 7th resistance is connected with the first output of described switch module, and the 7th other end of resistance and the right horn of loudspeaker are connected; One end of described the 8th resistance is connected with the second output of described switch module, and the 8th other end of resistance and the left horn of loudspeaker are connected.
2. circuit as claimed in claim 1, is characterized in that, described switch module comprises:
The first switch submodule, the first end of described the first switch submodule is connected with the first output of described audio frequency input module, and the control end of described the first switch submodule is connected with described driving signal generation module;
Second switch submodule, the first end of described second switch submodule is connected with the second end of described the first switch submodule, and the control end of described second switch submodule is connected with described driving signal generation module;
The 3rd switch submodule, the first end of described the 3rd switch submodule is connected with the second output of described audio frequency input module, and the control end of described the 3rd switch submodule is connected with described driving signal generation module; With
The 4th switch submodule, the first end of described the 4th switch submodule is connected with the second end of described the 3rd switch submodule, and the control end of described the 4th switch submodule is connected with described driving signal generation module.
3. circuit as claimed in claim 2, is characterized in that, described driving signal generation module comprises:
Drive signal to generate submodule;
The first resistance, one end of described the first resistance is connected with the output that described driving signal generates submodule, and the other end of described the first resistance is connected with the control end of described the 4th switch submodule with the control end of described the first switch submodule, the control end of the control end of described second switch submodule, described the 3rd switch submodule respectively; With
The second resistance, one end of described the second resistance is connected with the other end of described the first resistance, the other end ground connection of described the second resistance.
4. circuit as claimed in claim 3, is characterized in that, described the first switch submodule comprises:
The 3rd resistance, one end of described the 3rd resistance is connected with the first output of described audio frequency input module, the other end ground connection of described the 3rd resistance; With
The first switching tube, the first end of described the first switching tube is connected with one end of described the 3rd resistance, and the control end of described the first switching tube is connected with the other end of described the first resistance.
5. circuit as claimed in claim 3, is characterized in that, described second switch submodule comprises:
The 4th resistance, one end of described the 4th resistance is connected with the second end of described the first switching tube, the other end ground connection of described the 4th resistance; With
Second switch pipe, the first end of described second switch pipe is connected with one end of described the 4th resistance, the control end of described second switch pipe is connected with the other end of described the first resistance, and the second end of described second switch pipe is as the output of described second switch submodule.
6. circuit as claimed in claim 3, is characterized in that, described the 3rd switch submodule comprises:
The 5th resistance, one end of described the 5th resistance is connected with the second output of described audio frequency input module, the other end ground connection of described the 5th resistance; With
The 3rd switching tube, the first end of described the 3rd switching tube is connected with one end of described the 5th resistance, and the control end of described the 3rd switching tube is connected with the other end of described the first resistance.
7. circuit as claimed in claim 3, is characterized in that, described the 4th switch submodule comprises:
The 6th resistance, one end of described the 6th resistance is connected with the second end of described the 3rd switching tube, the other end ground connection of described the 6th resistance; With
The 4th switching tube, the first end of described the 4th switching tube is connected with one end of described the 6th resistance, the control end of described the 4th switching tube is connected with the other end of described the first resistance, and the second end of described the 4th switching tube is as the output of described the 4th switch submodule.
8. the circuit as described in any one in claim 4-7, is characterized in that, described the first switching tube, described second switch pipe, described the 3rd switching tube and described the 4th switching tube are N NMOS N-channel MOS N field-effect transistor MOSFET.
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| CN201420338627.3U CN204031429U (en) | 2014-06-24 | 2014-06-24 | Eliminate the circuit of pop noise |
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| CN201420338627.3U CN204031429U (en) | 2014-06-24 | 2014-06-24 | Eliminate the circuit of pop noise |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112637722A (en) * | 2020-12-21 | 2021-04-09 | 成都极米科技股份有限公司 | Mute control circuit and terminal equipment |
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2014
- 2014-06-24 CN CN201420338627.3U patent/CN204031429U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112637722A (en) * | 2020-12-21 | 2021-04-09 | 成都极米科技股份有限公司 | Mute control circuit and terminal equipment |
| CN112637722B (en) * | 2020-12-21 | 2021-11-09 | 成都极米科技股份有限公司 | Mute control circuit and terminal equipment |
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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 |
Granted publication date: 20141217 |