CN104093104A - Circuit and method for eliminating POP sound of earphone - Google Patents
Circuit and method for eliminating POP sound of earphone Download PDFInfo
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- CN104093104A CN104093104A CN201410329153.0A CN201410329153A CN104093104A CN 104093104 A CN104093104 A CN 104093104A CN 201410329153 A CN201410329153 A CN 201410329153A CN 104093104 A CN104093104 A CN 104093104A
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Abstract
The invention provides a circuit and method for eliminating POP sound of an earphone. The circuit comprises a connector, an ADC unit and a data processing and analyzing unit. The method includes the steps that a detection result of a detection pin to a left channel pin and a detection result of the ADC unit to the left channel pin are obtained in real time; whether the earphone is inserted completely or not is analyzed and judged according to the detection results; when it is determined that the earphone is inserted completely, a left channel power amplifier and a right channel power amplifier are turned on, and otherwise, the left channel power amplifier and the right channel power amplifier are not turned on. In the prior art, whether an earphone is inserted or not is judged only according to a detection result of a detection pin, in the circuit, the ADC unit is additionally arranged, whether the earphone is inserted completely or not is judged according to the detection result of the ADC unit and the detection result of the detection pin, so that it is guaranteed that the power amplifiers and an MIC_BIAS power supply can be turned on after the earphone is inserted completely, and therefore the phenomenon that the POP sound occurs due to the fact that the power amplifiers and the MIC_BIAS power supply are turned on when the earphone is not inserted completely can be avoided.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of earphone POP sound circuit and method eliminated.
Background technology
Universal due to mobile phone, one of staff substantially, and also along with the raising of mobile phone self function and performance, a lot of users directly use mobile phone music appreciating and give up MP3.Often the property opened earphone socket is widely used on mobile phone because of its reliable mechanical performance.The principle of the earphone socket of this class formation is the L channel contact and detection pin contact short of impelling after earphone heads is inserted completely in earphone socket, detect pin contact and be pulled to high level at mobile phone terminal, in the time detecting pin contact and L channel contact short, presented low level by L channel 32 Ohmic resistance short circuit groundings, this edge triggered interruption reaches the CPU of mobile phone, produces earphone and inserts interruption.This kind of earphone socket structure easily produces POP sound in the time of headset plugging, user is experienced and have a greatly reduced quality, and excessive POP sound is even to earphone generation infringement, has influence on user's the sense of hearing.
Summary of the invention
The object of the present invention is to provide a kind of earphone POP sound circuit and method eliminated, overcome earphone and do not produce when plugged earphone socket completely the defect of POP sound, promote user's experience effect.
The object of the invention is to be achieved through the following technical solutions.
A kind of earphone POP sound circuit of eliminating, comprises connector, L channel power amplifier, R channel power amplifier and Data Management Analysis unit; Described connector comprises L channel pin, R channel pin, detects pin; L channel pin connects described L channel power amplifier, and R channel pin connects described R channel power amplifier, detects pin and is connected to described Data Management Analysis unit;
Described earphone socket circuit also comprises ADC unit, and the input of this ADC unit is connected to described L channel pin, output is connected to described Data Management Analysis unit;
Described Data Management Analysis unit, judges for the testing result of the testing result in conjunction with described ADC unit and described detection pin whether current earphone is inserted completely, is judging the described L channel power amplifier of unlatching, R channel power amplifier after insertion completely, otherwise is not opening.
Wherein, described elimination earphone POP sound circuit also comprises microphone bias voltage power supply, and described connector also comprises microphone pin, and described microphone pin is connected to described microphone bias voltage power supply; In the time that described Data Management Analysis unit judges current earphone is inserted completely, open described microphone bias voltage power supply, otherwise do not open.
Wherein, between described ADC unit and L channel pin, be also in series with the second resistance, to reduce the impact of described ADC unit on audio signal.
Wherein, described L channel pin is also connected with residual charge bleed-off circuit.
Wherein, described residual charge bleed-off circuit is specially the 4th resistance, and one end of the 4th resistance is connected to L channel pin, other end ground connection.
Wherein, the impedance of described the 4th resistance is greater than 100 ohm.
Wherein, between described detection pin and Data Management Analysis unit, be also in series with the 5th resistance; Described the 5th resistance, at the link of itself and Data Management Analysis unit, is also connected to VDD power supply by the first resistance simultaneously.
Wherein, the impedance of described the first resistance is greater than 100K ohm, or the impedance total value of the 5th resistance and the first resistance is greater than 100K ohm.
Wherein, between described microphone pin and MIC_BIAS grid bias power supply, be also in series with the 3rd resistance.
A method of eliminating earphone POP sound, comprises step:
Close L channel power amplifier and the R channel power amplifier of earphone;
Real-time Obtaining detects the testing result of pin and ADC unit;
Judge in conjunction with the Analysis of test results of described detection pin and ADC unit whether earphone inserts completely;
In the time judging that earphone inserts completely, open L channel power amplifier, R channel power amplifier, otherwise do not open.
Said method also comprises: at initial time mute microphone (MIC) grid bias power supply; After judging that earphone inserts completely, open microphone bias voltage power supply, otherwise do not open.
Wherein, in the time judging that earphone does not insert completely, do not insert completely by voice or display screen reminding user current earphone.
Compared with prior art, the present invention's embodiment of the present invention has the following advantages:
Only according to detecting the testing result of pin, to judge whether earphone inserts different from prior art, the embodiment of the present invention has increased ADC unit newly, judge in conjunction with the testing result of ADC unit and detection pin whether earphone inserts completely, after having guaranteed completely to insert, just open power amplifier and microphone (MIC_BIAS) grid bias power supply, can avoid like this earphone not insert completely and appearance that power amplifier and microphone (MIC_BIAS) grid bias power supply has been opened caused POP sound.
Brief description of the drawings
Fig. 1 is the circuit diagram that earphone POP sound circuit is eliminated in preferred embodiment of the present invention;
Fig. 2 is the method flow diagram that earphone POP sound is eliminated in preferred embodiment of the present invention;
Fig. 3 is the method flow diagram that another embodiment of the present invention is eliminated earphone POP sound.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, in the present embodiment, eliminating earphone POP sound main circuit will comprise: connector, ADC and Data Management Analysis unit.
Connector, is positioned at earphone socket, and for realizing being connected of earphone and terminal, it provides 6 pins, is respectively: grounding pin 1, L channel pin 2, R channel pin 3, unsettled pin 4, detect pin 5, microphone pin 6.
Wherein, grounding pin 1 ground connection.L channel pin 2 is connected to a L channel power amplifier PA, in order to export left channel audio signal (HS_OUTL) to earphone.R channel pin 3 is connected to a R channel power amplifier PA, in order to export right channel audio signal (HS_OUTR) to earphone.Detect pin 5 and be connected to Data Management Analysis unit, for to Data Management Analysis unit output detection signal (EINT3_HEADSET).Microphone pin 6 is connected to MIC_BIAS grid bias power supply, for receiving microphone signal.
For ensureing to detect the accuracy that pin 5 detects, in the present embodiment, one the 5th resistance R 5 of also connecting between detection pin 5 and Data Management Analysis unit, detects pin 5 simultaneously and is connected to VDD power supply through the 5th resistance R 5, first resistance R 1 of series connection.Wherein, the first resistance R 1 is pull-up resistor, need to adopt high-ohmic resistor, or the total value of the 5th resistance R 5 and the first resistance R 1 is high resistant, such as the resistance higher than 100K or 200K.
In order to judge exactly whether completely plugged earphone socket of earphone, in the present embodiment, also set up ADC unit, the input of this ADC unit is connected to L channel pin 2, output is connected to Data Management Analysis unit, by ADC unit, L channel pin 2 is detected, for Data Management Analysis unit provides the another basis for estimation in order to judge whether earphone inserts completely.In addition, because ADC unit has taken one part of current, for avoiding the left channel audio signal that ADC unit can be exported L channel pin 2 to produce harmful effect, in the present embodiment, second resistance R 2 of also connecting between L channel pin 2 and ADC unit.
L channel pin 2 is also connected with residual charge bleed-off circuit, specifically comprises the 4th resistance R 4, and one end ground connection, one end are connected to L channel pin 2, and its impedance can be for being greater than certain value, such as being greater than 100 ohm, for the residual charge of releasing.
In the present embodiment, Data Management Analysis unit, receive from the detection signal of ADC unit with from the detection signal that detects pin 5 simultaneously, judge that according to these two kinds of detection signals whether current earphone is inserted completely, controls the opening time of L channel power amplifier PA, R channel power amplifier PA and MIC_BIAS grid bias power supply accordingly.
Refer to Fig. 2, a kind of method of eliminating earphone POP sound comprises:
200, close L channel power amplifier, R channel power amplifier and the MIC_BIAS grid bias power supply of earphone.
201, Real-time Obtaining detects the detection signal of pin and ADC unit.
202, analyze and judge whether earphone inserts completely in conjunction with both.
203,, in the time judging that earphone inserts completely, open L channel power amplifier PA, R channel power amplifier PA and MIC_BIAS grid bias power supply.
204, in the time judging that earphone does not insert completely, do not open L channel power amplifier PA, R channel power amplifier PA and MIC_BIAS grid bias power supply, and do not insert completely by voice or by display screen reminding user current earphone.
In said method, only according to detecting the testing result of pin, to judge whether earphone inserts different from prior art, the present embodiment has increased ADC unit newly, judge in conjunction with the testing result of ADC unit and detection pin whether earphone inserts completely, after having guaranteed completely to insert, just open power amplifier and MIC_BIAS grid bias power supply, can avoid like this earphone not insert completely and power amplifier and MIC_BIAS grid bias power supply have been opened the appearance of caused POP sound.
Refer to Fig. 3, in another embodiment, earphone socket is not established microphone pin, and when elimination earphone POP sound circuit is not established MIC_BIAS grid bias power supply yet, the method for now eliminating earphone POP sound comprises:
300, close L channel power amplifier and the R channel power amplifier of earphone.
301, Real-time Obtaining detects the detection signal of pin and ADC unit.
302, analyze and judge whether earphone inserts completely in conjunction with both.
303,, in the time judging that earphone inserts completely, open L channel power amplifier PA and R channel power amplifier PA.
304, in the time judging that earphone does not insert completely, do not open L channel power amplifier PA and R channel power amplifier PA, and do not insert completely by voice or by display screen reminding user current earphone.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. eliminate an earphone POP sound circuit, comprise connector, L channel power amplifier, R channel power amplifier and Data Management Analysis unit; Described connector comprises L channel pin, R channel pin, detects pin; L channel pin connects described L channel power amplifier, and R channel pin connects described R channel power amplifier, detects pin and is connected to described Data Management Analysis unit; It is characterized in that,
Described earphone socket circuit also comprises ADC unit, and the input of this ADC unit is connected to described L channel pin, output is connected to described Data Management Analysis unit;
Described Data Management Analysis unit, judges for the testing result of the testing result in conjunction with described ADC unit and described detection pin whether current earphone is inserted completely, is judging the described L channel power amplifier of unlatching, R channel power amplifier after insertion completely, otherwise is not opening.
2. elimination earphone POP sound circuit as claimed in claim 1, is characterized in that, described elimination earphone POP sound circuit also comprises microphone bias voltage power supply, and described connector also comprises microphone pin, and described microphone pin is connected to described microphone bias voltage power supply; In the time that described Data Management Analysis unit judges current earphone is inserted completely, open described microphone bias voltage power supply, otherwise do not open.
3. elimination earphone POP sound circuit as claimed in claim 1, is characterized in that, between described ADC unit and L channel pin, is also in series with the second resistance, to reduce the impact of described ADC unit on left channel audio signal.
4. elimination earphone POP sound circuit as claimed in claim 1, is characterized in that, described L channel pin is also connected with residual charge bleed-off circuit.
5. elimination earphone POP sound circuit as claimed in claim 4, is characterized in that, described residual charge bleed-off circuit is specially the 4th resistance, and one end of the 4th resistance is connected to L channel pin, other end ground connection.
6. elimination earphone POP sound circuit as claimed in claim 5, is characterized in that, the impedance of described the 4th resistance is greater than 100 ohm.
7. elimination earphone POP sound circuit as claimed in claim 1, is characterized in that, is also in series with the 5th resistance between described detection pin and Data Management Analysis unit; Described the 5th resistance, at the link of itself and Data Management Analysis unit, is also connected to VDD power supply by the first resistance simultaneously.
8. elimination earphone POP sound circuit as claimed in claim 1, is characterized in that, the impedance of described the first resistance is greater than 100K ohm, or the impedance total value of the 5th resistance and the first resistance is greater than 100K ohm.
9. elimination earphone POP sound circuit as claimed in claim 2, is characterized in that, is also in series with the 3rd resistance between described microphone pin and MIC_BIAS grid bias power supply.
10. a method of eliminating earphone POP sound, is characterized in that, the method comprising the steps of:
Close L channel power amplifier and the R channel power amplifier of earphone;
Real-time Obtaining detects the testing result of pin and ADC unit;
Judge in conjunction with the Analysis of test results of described detection pin and ADC unit whether earphone inserts completely;
In the time judging that earphone inserts completely, open L channel power amplifier, R channel power amplifier, otherwise do not open.
The method of 11. elimination earphone POP sounds as claimed in claim 10, is characterized in that, the method also comprises: at initial time mute microphone (MIC) grid bias power supply; After judging that earphone inserts completely, open microphone bias voltage power supply, otherwise do not open.
The method of 12. elimination earphone POP sounds as claimed in claim 10, is characterized in that, in the time judging that earphone does not insert completely, does not insert completely by voice or display screen reminding user current earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410329153.0A CN104093104A (en) | 2014-07-10 | 2014-07-10 | Circuit and method for eliminating POP sound of earphone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410329153.0A CN104093104A (en) | 2014-07-10 | 2014-07-10 | Circuit and method for eliminating POP sound of earphone |
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| CN104093104A true CN104093104A (en) | 2014-10-08 |
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| CN201410329153.0A Pending CN104093104A (en) | 2014-07-10 | 2014-07-10 | Circuit and method for eliminating POP sound of earphone |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107241676A (en) * | 2017-06-15 | 2017-10-10 | 南通同洲电子有限责任公司 | A kind of loudspeaker power amplifier test device |
| CN109660903A (en) * | 2019-01-14 | 2019-04-19 | 安凯(广州)微电子技术有限公司 | A kind of earphone pop sound removing method, system and device |
| CN111294685A (en) * | 2019-07-02 | 2020-06-16 | 展讯通信（上海）有限公司 | Method, device, terminal and storage medium for reducing earphone insertion noise |
| CN112839291A (en) * | 2020-12-24 | 2021-05-25 | 佳禾智能科技股份有限公司 | Device and method for testing pop sound generated by negative pressure of microphone |
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| CN101742381A (en) * | 2009-11-23 | 2010-06-16 | 北京中星微电子有限公司 | Denoising drive circuit and method |
| 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 |
| CN103414984A (en) * | 2013-07-25 | 2013-11-27 | 苏州三星电子电脑有限公司 | System for eliminating explosion sound of earphones |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101742381A (en) * | 2009-11-23 | 2010-06-16 | 北京中星微电子有限公司 | Denoising drive circuit and method |
| 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 |
| CN103414984A (en) * | 2013-07-25 | 2013-11-27 | 苏州三星电子电脑有限公司 | System for eliminating explosion sound of earphones |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107241676A (en) * | 2017-06-15 | 2017-10-10 | 南通同洲电子有限责任公司 | A kind of loudspeaker power amplifier test device |
| CN109660903A (en) * | 2019-01-14 | 2019-04-19 | 安凯(广州)微电子技术有限公司 | A kind of earphone pop sound removing method, system and device |
| CN111294685A (en) * | 2019-07-02 | 2020-06-16 | 展讯通信（上海）有限公司 | Method, device, terminal and storage medium for reducing earphone insertion noise |
| CN111294685B (en) * | 2019-07-02 | 2022-02-11 | 展讯通信（上海）有限公司 | Method, device, terminal and storage medium for reducing earphone insertion noise |
| CN112839291A (en) * | 2020-12-24 | 2021-05-25 | 佳禾智能科技股份有限公司 | Device and method for testing pop sound generated by negative pressure of microphone |
| CN112839291B (en) * | 2020-12-24 | 2022-08-05 | 佳禾智能科技股份有限公司 | Device and method for testing pop sound generated by negative pressure of microphone |
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Address after: A District No. 9018 Han innovation building in Nanshan District high tech Zone in Shenzhen city of Guangdong Province, North Central Avenue, 518000 floor 10 Applicant after: Nubian Technologies Ltd. Address before: A District No. 9018 Han innovation building in Nanshan District high tech Zone in Shenzhen city of Guangdong Province, North Central Avenue, 518000 floor 10 Applicant before: Shenzhen ZTE Mobile Tech Co., Ltd. |
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Application publication date: 20141008 |