CN102638741B - The method of earphone POP noise is completely eliminated - Google Patents
The method of earphone POP noise is completely eliminated Download PDFInfo
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- CN102638741B CN102638741B CN201110036271.9A CN201110036271A CN102638741B CN 102638741 B CN102638741 B CN 102638741B CN 201110036271 A CN201110036271 A CN 201110036271A CN 102638741 B CN102638741 B CN 102638741B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Amplifiers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of method that earphone POP noise is completely eliminated, during earphone path output DC level, earphone path and earphone horn are disconnected by analog switch；Discharged into Deng earphone path DC level by analog switch conducting resistance after zero volt, then earphone path by analog switch is connected to earphone horn, this method comprises the following steps：Mobile phone plugs in the earphone, music player interface, clicks on and plays music；Software controls the signal of Enable Pin to be height, and second point is connected with ground；Software merit rating earphone passage, earphone path output DC level；Second point voltage begins through analog switch to the conducting resistance electric discharge on ground；Dropped to completely after zero volt Deng second point voltage, software controls the signal of Enable Pin to be low, and second point is connected to thirdly, i.e. earphone path is connected to earphone horn；Step 6：Software starts to transmit music data, plays music.Earphone POP noise can be completely eliminated in the present invention.
Description
Technical field
The present invention relates to a kind of method that earphone POP noise is completely eliminated.
Background technology
POP noise refers in audio components in the plosive produced by the transient impact that upper electricity and power down moment are brought.Mesh
Before, in most of mobile phone hardware platform, head circuit is powered by single supply, as shown in figure 1, so outside earphone
Interface is, it is necessary to concatenate capacitance C1 to earphone horn L.
Because the left and right acoustic channels of earphone are duplicate, analyses below, we just only analyze the L channel of earphone.Ear
When machine sowing is put the music on, first point（A points）, second point（B points）2 points of waveform is as shown in Figure 2.It can be observed from fig. 2 that earphone is defeated
Go out DC level, the both end voltage of capacitance is unable to saltus step, cause have a pulse voltage on earphone horn, produce POP
Noise.
A kind of circuit for solving earphone POP noise is as shown in figure 3, it will be seen that earphone plays music, earphone path
Export DC level, Enable Pin（NO_POP_EN）Signal first to be low, transistor T2 cut-offs, metal-oxide-semiconductor T1 conductings make earphone left
R channel is connected to ground.Second point（B points）Voltage is discharged by the conducting resistance of metal-oxide-semiconductor, works as second point（B points）Voltage is put soon
When electricity is to zero, Enable Pin is controlled（NO_POP_EN）Signal for height, earphone left and right acoustic channels and ground disconnection, commence play out
Music.
The electric marrow of above-mentioned solution earphone POP noise is when earphone exports DC level, earphone left and right acoustic channels
It is connected to ground；When commencing play out music, earphone left and right acoustic channels and ground are disconnected.In actual circuit application, typically from electric conduction
The smaller metal-oxide-semiconductor of resistance or transistor are used as switch.In theory, if the conducting resistance switched is zero, being can be with complete
It totally disappeared except POP noise.In fact, the switch that conducting resistance is zero is non-existent, so foregoing circuit is to disappear completely
Except POP noise, compared to common head circuit, POP noise has obtained very big suppression, less demanding for audio quality
In the case of, it is acceptable.For audio quality it is exigent in the case of, it is necessary to POP noise is completely eliminated.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method that earphone POP noise is completely eliminated, and it can be with complete
It totally disappeared except earphone POP noise.
The present invention is to solve above-mentioned technical problem by following technical proposals：Earphone POP noise is completely eliminated in one kind
Method, it is characterised in that earphone path output DC level when, earphone path and earphone horn are broken by analog switch
Open；Discharged into Deng earphone path DC level by analog switch conducting resistance after zero volt, then earphone path is passed through simulation
Switch is connected to earphone horn, and this method comprises the following steps：
Step one：Mobile phone plugs in the earphone, music player interface, clicks on and plays music；
Step 2：Software controls the signal of Enable Pin to be height, and second point is connected with ground；
Step 3：Software merit rating earphone passage, earphone path output DC level；
Step 4：Second point voltage begins through analog switch to the conducting resistance electric discharge on ground；
Step 5：Dropped to completely after zero volt Deng second point voltage, software controls the signal of Enable Pin to be low, second point company
It is connected to thirdly, i.e. earphone path is connected to earphone horn；
Step 6：Software starts to transmit music data, plays music.
The positive effect of the present invention is：First, the POP noise of earphone is completely eliminated, the audio product of mobile phone are improved
Matter；2nd, circuit is simple, and integrated level is higher；3rd, the conducting resistance to analog switch is required without too big, can pass through software control
The switching sequence of analog switch processed.Analog switch selection model is numerous, and cost is less expensive.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing common head circuit.
Fig. 2 is existing first point（A points）, second point（B points）Oscillogram.
Fig. 3 is the circuit diagram of the circuit of existing solution earphone POP noise.
Fig. 4 for the present invention eliminate the circuit diagram of the circuit of earphone POP noise.
Fig. 5 is first point of the invention（A points）, second point（B points）, thirdly（C points）, the 4th point（D points）4 points of waveform
Figure.
The flow chart of the method for earphone POP noise is completely eliminated for the present invention by Fig. 6.
Embodiment
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, to describe technical scheme in detail.
As shown in Figure 4 and Figure 5, during earphone path output DC level, by analog switch U1 by earphone path and earphone
Loudspeaker disconnect；Discharged into Deng earphone path DC level by analog switch conducting resistance after 0V, then earphone path is passed through
Analog switch is connected to earphone horn.As shown in fig. 6, the method that earphone POP noise is completely eliminated in the present invention comprises the following steps：
Step one：Mobile phone plugs in the earphone, music player interface, clicks on and plays music；
Step 2：Software controls Enable Pin（NO_POP_EN）Signal for height, second point（B points）It is connected with ground；
Step 3：Software merit rating earphone passage, earphone path output DC level；
Step 4：Second point（B points）Voltage begins through analog switch to the conducting resistance electric discharge on ground；
Step 5：Deng second point（B points）Voltage is dropped to after 0V completely, software control Enable Pin（NO_POP_EN）Letter
Number be low, second point（B points）It is connected to thirdly（C points）, i.e. earphone path is connected to earphone horn.
Step 6：Software starts to transmit music data, plays music.
Although the foregoing describing the embodiment of the present invention, it will be appreciated by those of skill in the art that these
It is merely illustrative of, on the premise of the principle and essence without departing substantially from the present invention, a variety of changes can be made to these embodiments
More or modification.Therefore, protection scope of the present invention is defined by the appended claims.
Claims (1)
1. a kind of method that earphone POP noise is completely eliminated, it is characterised in that during earphone path output DC level, pass through mould
Intend switch to disconnect earphone path and earphone horn；Deng earphone path DC level zero is discharged into by analog switch conducting resistance
After volt, then earphone path by analog switch is connected to earphone horn, the analog switch is serially connected in earphone path and ear
Between machine loudspeaker, the analog switch is used to connect the earphone path and the earphone horn in response to software control, or even
Lead to the earphone path and the conducting resistance to ground；
This method comprises the following steps：
Step one：In the case where mobile phone plugs in the earphone and plays music, software controls the letter of the Enable Pin of the analog switch
Number for height, second point and ground be connected, the second point be the analog switch common port, the analog switch common port sound
Answer the signal of the Enable Pin and be connected with ground or earphone horn；
Step 2：Software merit rating earphone path, earphone path output DC level；
Step 3：Second point voltage begins through analog switch to the conducting resistance electric discharge on ground；
Step 4：Dropped to completely after zero volt Deng second point voltage, software controls the signal of Enable Pin to be low, and second point is connected to
Thirdly, i.e., earphone path is connected to earphone horn, and described is thirdly the earphone horn；
Step 5：Software starts to transmit music data, plays music.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110036271.9A CN102638741B (en) | 2011-02-11 | 2011-02-11 | The method of earphone POP noise is completely eliminated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110036271.9A CN102638741B (en) | 2011-02-11 | 2011-02-11 | The method of earphone POP noise is completely eliminated |
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| Publication Number | Publication Date |
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| CN102638741A CN102638741A (en) | 2012-08-15 |
| CN102638741B true CN102638741B (en) | 2017-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110036271.9A Active CN102638741B (en) | 2011-02-11 | 2011-02-11 | The method of earphone POP noise is completely eliminated |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103974169B (en) * | 2013-01-24 | 2018-01-05 | 宏碁股份有限公司 | Audio processing device and audio processing method |
| CN104378715B (en) * | 2014-11-25 | 2018-07-06 | 小米科技有限责任公司 | The device and method for reducing earphone POP sounds |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6940345B2 (en) * | 2003-12-31 | 2005-09-06 | Intel Corporation | Supplying a ramp voltage to an amplifier |
| CN101742383A (en) * | 2009-12-15 | 2010-06-16 | 中兴通讯股份有限公司 | Device and method for eliminating plosives of headset |
| CN101790122A (en) * | 2010-02-06 | 2010-07-28 | 青岛海信移动通信技术股份有限公司 | Plosive eliminating circuit of audio system and mobile communication terminal |
-
2011
- 2011-02-11 CN CN201110036271.9A patent/CN102638741B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6940345B2 (en) * | 2003-12-31 | 2005-09-06 | Intel Corporation | Supplying a ramp voltage to an amplifier |
| CN101742383A (en) * | 2009-12-15 | 2010-06-16 | 中兴通讯股份有限公司 | Device and method for eliminating plosives of headset |
| CN101790122A (en) * | 2010-02-06 | 2010-07-28 | 青岛海信移动通信技术股份有限公司 | Plosive eliminating circuit of audio system and mobile communication terminal |
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| Publication number | Publication date |
|---|---|
| CN102638741A (en) | 2012-08-15 |
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