CN103414984A - System for eliminating explosion sound of earphones - Google Patents
System for eliminating explosion sound of earphones Download PDFInfo
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- CN103414984A CN103414984A CN2013103161392A CN201310316139A CN103414984A CN 103414984 A CN103414984 A CN 103414984A CN 2013103161392 A CN2013103161392 A CN 2013103161392A CN 201310316139 A CN201310316139 A CN 201310316139A CN 103414984 A CN103414984 A CN 103414984A
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Abstract
The invention discloses a system for eliminating explosion sound of earphones. The system comprises an induction unit, a sound output unit and a discharging unit, wherein the induction unit is used for inducting the plug-in state or plug-out state of the earphones, the sound output unit is used for outputting sound signals to the earphones for playing when the earphones are plugged in, and the discharging unit is used for connecting the earphones to the ground for releasing charges when the earphones are plugged out. By the utilization of four-section type earphone jacks with the time sequence function and the cooperation with relevant hardware circuits and driving programs, Pop noise can be minimum and even disappears when the earphones are plugged out.
Description
Technical field
The present invention relates to the interfacing field.
Background technology
Consumer field is more and more paid attention to for the experience of sound now, and " Pop " noise sent in earphone may allow some fastidious users accept." Pop " noise refer to audio parts power on, cut off the power supply moment and power on stable after, the explosion sound that the transient impact that various operations bring produces.At present, common earphone (male) comprises following 2 types on the market.As shown in Figure 1, the first type is: L channel L/ R channel R/ ground connection G/ Mike M, for example, for Samsung Galaxy series, M4=L, M1=R, M6=G, M5=M; The second type is: L channel L/ R channel R//Mike M/ground connection G, and for example, concerning Nokia/Motolora mobilephone series, M4=L, M1=R, M6=M, M5=G.The present invention be take the earphone of the first type sequence and is improved as example, and the earphone of the second type sequence can be made similar improvement and do not need additionally to pay creative work, the improvement that it should be noted that simple hardware has no idea to avoid, noise while relying on the quiet method of software to avoid inserting though simple, but the noise of extracting while playing has no idea to avoid, because it is relevant that noise and left and right acoustic channels are encountered MIC voltage, can not improve fully by software.
Summary of the invention
The deficiency existed in order to overcome prior art, the object of the present invention is to provide a kind of earphone plosion to eliminate system, and it can thoroughly eliminate " Pop " noise produced in the earphone withdrawal process.
For reaching above purpose, the invention provides a kind of earphone plosion and eliminate system, comprise
Sensing unit, be used to the insertion of responding to earphone or extract state;
Voice output unit, play for voice signal is outputed to earphone when earphone inserts;
Discharge cell, for discharging electric charge when the earphone withdrawal process by earphone ground connection.
Further improvement of the present invention is, described earphone has a headset plug, and described headset plug comprises L channel L contact-segment, R channel R contact-segment, Mike M contact-segment and the ground connection G contact-segment arranged to the space, bottom from top.
Further improvement of the present invention is, described voice output unit also comprises a control circuit, and described control circuit is for the operating state of the described voice output unit of induction output control according to described sensing unit.
Further improvement of the present invention is, described control circuit comprises a bias voltage loaded circuit, and described bias voltage loaded circuit is that described Mike M contact-segment loads or eliminate bias voltage according to the induction result of described sensing unit.
Further improvement of the present invention is, whether described sensing unit comprises for the contacted L pin of earphone L channel L contact-segment, for the R pin that contacts with described R channel R contact-segment, for the M pin that contacts with described Mike M contact-segment, the S pin and the D pin that for the G pin that contacts with described ground connection G contact-segment, for the perception earphone, insert.
Further improvement of the present invention is, described discharge cell is by with described Mike M contact-segment, being connected, in the earphone withdrawal process, by Mike M contact-segment ground connection to discharge electric charge.
Further improvement of the present invention is, described discharge cell is MOSFET, and the grid of described MOSFET is connected with the S pin, and the D utmost point is connected with Mike M contact-segment.
Further improvement of the present invention is, described D pin and the same pin configuration of L pin multiplexing.
Further improvement of the present invention is, also comprises a buffer circuit be arranged between described D pin and S pin.
The invention has the beneficial effects as follows: by the four-part form earphone interface of use with the sequential function, coordinate relevant hardware circuit and driver, " Pop " noise minimum in the time of can realizing extracting earphone, even disappear.
The accompanying drawing explanation
Accompanying drawing 1 is the structural representation of four-part form earphone of the prior art;
Accompanying drawing 2 is each pinout figure according to interface of the present invention;
Accompanying drawing 3 is the connection status schematic diagram according to interface of the present invention and headset plug;
Accompanying drawing 4 is the structural representation of interface in a circuit according to the invention.
Embodiment
Below preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
The present invention is directed to the audio system that 4 common segmentation earphones are positioned and improve, comprise following key element: 4 segmentation earphone interfaces redesigns, adopt the Interface design scheme with timing; Voicefrequency circuit coordinates earphone interface to do corresponding change; Driver is done corresponding adjustment.Each scheme forms mode that thes contents are as follows arranges:
For the interface of the D pin that standalone feature is arranged, plug can promote the S pin while inserting and be connected with the D pin, or the S pin is connected with the D pin before, after insertion, S pin and D pin is pushed open, and is caused the S pin can not be connected with the D pin.Because the earphone interface pin number with independent D pin is relatively many, and interface is heavier wordy, thereby preferentially selects without the interface of independent D pin and make improvement.
And as the interface without independent D pin, the function that realizes induction will be by combining other pin, such as D pin and L pin or the same pin of R pin multiplexing, initial voltage by the left passage of earphone (L pin) or right passage (R pin) or earth impedance etc. are set the condition that triggers sense events, judge that by external circuit voltage on corresponding induction pin or earth impedance carry out corresponding action and set.
Have the interface of sequential to refer to earphone when 4 segmentations in the plugged earphone interface, who at first and the pin inside own predefined interface touch, different Interface design, the sequencing of these four sections contacts of L/R/G/M is different.In the present invention, can adjust by each relative position that contacts pin of adjusting interface inside the order of contact conducting.Also by each relative length that contacts pin of adjusting interface inside, adjust the order of contact conducting.
Discharge circuit in the moment that earphone interface is pulled out, bleeds off the bias voltage of MIC, realizes with a MOSFET, uses MOSFET to discharge to have discharge resistance little, the characteristic that discharging current is large, the characteristics that discharge time is short.
For the earphone interface without independent D pin, because L pin or the R pin of the meeting of S pin and earphone are connected after earphone inserts, consider when playing sound, in L pin or R pin, have the electric current output of different voltages, if from the amplitude of L pin or the output of R pin electric current, reached the triggering level of S pin, can cause the misoperation of interface sensor circuit, so can adopt buffer circuit that the voltage of the electric current of L pin or R pin output and the trigger voltage of S pin are distinguished.
As shown in Figure 2, below, we take the interface with timing (female) that only has 5 pins and are that example describes operation principle of the present invention in detail.This interface does not have independent D pin, needs by the in addition isolation on function of external circuits, but more succinct in form.Its each pin is defined as follows:
#1 pin: S pin;
The #2 pin:: the R pin;
#3 pin: G pin;
#4 pin: M pin;
The #5 pin: L pin and D pin share same pin.
From accompanying drawing 3, can find out, the stroke of above each pin: G pin, the M pin, the R pin, the S pin, L pin (D pin) position difference, namely at plug, insert in the connection procedure of interface, R channel R contact-segment, ground connection G contact-segment, Mike M contact-segment, the conducting that successively contacts with corresponding pin separately successively of L channel L contact-segment, can find out from the graph, S pin and earphone male finally touch, when also contacting conducting, the S pin closes the broadcasting of outside loudspeaker, open the output of earphone, open Mike's bias voltage, thereby also just guarantee that earphone is in the process of inserting, before not sensing, all do not have electric current to flow through earphone, earphone does not have plosive in the process of inserting so just can guarantee yet.
The external circuit part matched with above-mentioned interface is below described.
As shown in Figure 4, its circuit design is as follows:
While inserting, S pin and L pin (D pin) are not separated; In the time of the plugged earphone interface of the past left side, 4 segmentation earphone the right from the graph, can see that earphone can link together the S pin and the L pin (D pin) that originally are separated in together; Equally, we are by judging the level on earphone S pin comes perception whether insertion is arranged.Process is as follows:
Before earphone does not insert, S pin and L pin (D pin) are separated, the HP_Sense# be connected with the S pin is pulled to a predetermined voltage by the VCC decision, as 3.2V, the predetermined voltage that the voltage of reverse input end voltage (No. 2 pins of comparator) determines by resistance R 1 and R2, this reverse input end in the present embodiment (No. 2 pins of comparator) voltage is 2.2V.Now comparator in-phase input end (No. 3 pins of comparator) voltage is 3.2V, 2.2V higher than reverse input end (No. 2 pins of comparator) voltage, comparator output (No. 1 pin of comparator) high level, the pin no current of HP_Sense_CODEC flows through, and the earphone result of determination is that the earless machine transplanting of rice enters.
When earphone inserts, the S pin is connected by earphone with L pin (D pin), the pin of HP_Sense# is pulled low to the magnitude of voltage identical with L pin (D pin), now in-phase input end voltage equals the voltage of L pin (D pin), and in the present embodiment, this voltage is 1.6V, lower than reverse input end voltage 2.2V, comparator is output as low level, and the pin of HP_Sense_CODEC has electric current to flow through, and the earphone result of determination is for there being earphone to insert.Then driving can be done some corresponding actions, such as the bias voltage output of setting Mike, open earphone output, close the broadcasting of outside loudspeaker, can certainly be for opening some inner function.
From top figure, we can see that earphone S pin is to link together with the L pin (D pin) of earphone.In the process of earphone output sound, the electric current that the amplitude that has constantly changes is transferred to the S pin by L pin (D pin).If now we play a just profound ripple, the S pin electric current of earphone can change, if the change in voltage amplitude of this electric current has surpassed 2.2V, now comparator in-phase input end (No. 3 pins of comparator) voltage is higher than the 2.2V of reverse input end (No. 2 pins of comparator) voltage, comparator output (No. 1 pin of comparator) high level, the pin no current of HP_Sense_CODEC flows through, and the earphone result of determination is that the earless machine transplanting of rice enters.Namely in the process of earphone voice output, can constantly cause the earphone state having earphone insertion and the earless machine transplanting of rice to enter middle switching, cause erroneous judgement.So in the present embodiment, use a comparator, isolate S pin and the L pin (D pin) of earphone, the change of voltage amplitude when the predetermined voltage of comparator reverse input end should be greater than voice output.If play, be the sine wave of 1V, the voltage of voice output all is greater than the voltage of inverse output terminal, guarantees to play music after earphone inserts, and the pin that general amplitude is not more than predetermined voltage can not cause the erroneous judgement of earphone S pin disconnected.
Magnitude of voltage in above embodiment is the theoretical value adopted for principle of the present invention is described in detail in detail, does not limit protection scope of the present invention.
When D pin and the same pin of G pin multiplexing, because the G pin voltage is constant, so just do not need to arrange comparator as buffer circuit, directly the HP_Sense signal is connected and gets final product with the HP_Sense_CODEC signal.Before earphone inserted, HP_Sense voltage was high level, and the HP_Sense_CODEC signal is high level, and the pin no current of HP_Sense_CODEC flows through, and the earphone result of determination is that the earless machine transplanting of rice enters.When earphone inserted, HP_Sense voltage was low level, and the HP_Sense_CODEC signal is low level, and the pin electric current of HP_Sense_CODEC flows through, and the earphone result of determination is for there being earphone to insert.
What certainly need to mention especially is that HP_Sense_CODEC is that high level or low level are judged to be the earphone insertion, is the conventional selection result of circuit, should not limit protection scope of the present invention.
Through test, this circuit is when earphone is pulled out, a series of plosive is also arranged, this is due to after now microphone bias is opened, and the electric charge on the pin before earphone is extracted in blue frame does not discharge clean, then in the process of extracting, when earphone left and right streaked the M pin, the electric charge of its M pin can be by the left side of earphone, and release on the right side, causes the earphone the inside can hear a series of plosive.For this plosive is eliminated, the present invention increases the MOSFET of an electric discharge, at short notice electric charge is bled off.This MOSFET discharge principle is as follows, in the process that earphone is pulled out, the moment that the S pin of earphone and L pin are separated, HP_Sense is returned to high level (being 3.2V in the present embodiment), the grid of this MOSFET (being connected with HP_Sense) is pulled to high level, the D utmost point of MOSFET (being connected with MIC_BIAS) and the S utmost point (being connected with ground) short circuit within the time of about 350ns, discharge the MIC_BIAS electric charge.Now earphone has not just had plosive yet when streaking the M pin.
In sum, can meet the final stage of inserting at earphone and just open the bias voltage of microphone, thereby also just guarantee that earphone is not having before Sense arrives in the process of inserting, all do not have electric current to flow through earphone, earphone does not have plosive in the process of inserting so just can guarantee yet, the buffer circuit increased in addition and discharge circuit can guarantee all can not produce noise in playing process with in withdrawal process, thereby when overlapping noise eliminating system, this is applied to notebook computer, mobile phone, panel computers etc. are various while having in the multimedia equipment of audio playing function, can be subject to consumer's very big welcome.
Above execution mode only is explanation technical conceive of the present invention and characteristics; its purpose is to allow the person skilled in the art understand content of the present invention and implemented; can not limit the scope of the invention with this, all equivalences that Spirit Essence is done according to the present invention change or modification all is encompassed in protection scope of the present invention.
Claims (9)
1. an earphone plosion is eliminated system, it is characterized in that: comprise
Sensing unit, be used to the insertion of responding to earphone or extract state;
Voice output unit, play for voice signal is outputed to earphone when earphone inserts;
Discharge cell, for discharging electric charge when the earphone withdrawal process by earphone ground connection.
2. earphone plosion according to claim 1 is eliminated system, it is characterized in that: described earphone has a headset plug, and described headset plug comprises L channel L contact-segment, R channel R contact-segment, Mike M contact-segment and the ground connection G contact-segment arranged to the space, bottom from top.
3. earphone plosion according to claim 2 is eliminated system, it is characterized in that: described voice output unit also comprises a control circuit, and described control circuit is for the operating state of the described voice output unit of induction output control according to described sensing unit.
4. earphone plosion according to claim 3 is eliminated system, it is characterized in that: described control circuit comprises a bias voltage loaded circuit, and described bias voltage loaded circuit is that described Mike M contact-segment loads or eliminate bias voltage according to the induction result of described sensing unit.
5. earphone plosion according to claim 2 is eliminated system, it is characterized in that: whether described sensing unit comprises for the contacted L pin of earphone L channel L contact-segment, for the R pin that contacts with described R channel R contact-segment, for the M pin that contacts with described Mike M contact-segment, the S pin and the D pin that for the G pin that contacts with described ground connection G contact-segment, for the perception earphone, insert.
6. earphone plosion according to claim 5 is eliminated system, it is characterized in that: described discharge cell is by with described Mike M contact-segment, being connected, in the earphone withdrawal process, by Mike M contact-segment ground connection to discharge electric charge.
7. the earphone plosion of stating according to claim 6 is eliminated system, and it is characterized in that: described discharge cell is MOSFET, and the grid of described MOSFET is connected with the S pin, and the D utmost point is connected with Mike M contact-segment.
8. earphone plosion according to claim 5 is eliminated system, it is characterized in that: described D pin and the same pin configuration of L pin multiplexing.
9. according to right, want 8 described earphone plosions to eliminate system, it is characterized in that: also comprise a buffer circuit be arranged between described D pin and S pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103161392A CN103414984A (en) | 2013-07-25 | 2013-07-25 | System for eliminating explosion sound of earphones |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103161392A CN103414984A (en) | 2013-07-25 | 2013-07-25 | System for eliminating explosion sound of earphones |
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| CN104093104A (en) * | 2014-07-10 | 2014-10-08 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP sound of earphone |
| WO2016000261A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Terminal and system capable of reducing noises generated in earphone insertion and pulling processes |
| 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 |
| CN106537932A (en) * | 2014-07-23 | 2017-03-22 | 三星电子株式会社 | Earset and earset operation method |
| CN109218871A (en) * | 2017-06-29 | 2019-01-15 | 北京小米移动软件有限公司 | Earphone interface circuit, audio mould group and electronic equipment |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016000261A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Terminal and system capable of reducing noises generated in earphone insertion and pulling processes |
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| CN109218871A (en) * | 2017-06-29 | 2019-01-15 | 北京小米移动软件有限公司 | Earphone interface circuit, audio mould group and electronic equipment |
| CN109218871B (en) * | 2017-06-29 | 2020-10-16 | 北京小米移动软件有限公司 | Earphone interface circuit, audio module and electronic equipment |
| 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 |
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Application publication date: 20131127 |