CN101742383A - Device and method for eliminating plosives of headset - Google Patents

Device and method for eliminating plosives of headset Download PDF

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Publication number
CN101742383A
CN101742383A CN 200910260313 CN200910260313A CN101742383A CN 101742383 A CN101742383 A CN 101742383A CN 200910260313 CN200910260313 CN 200910260313 CN 200910260313 A CN200910260313 A CN 200910260313A CN 101742383 A CN101742383 A CN 101742383A
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CN
China
Prior art keywords
earphone
switch
ground wire
headset
plosion
Prior art date
Application number
CN 200910260313
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Chinese (zh)
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CN101742383B (en
Inventor
董玲玲
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中兴通讯股份有限公司
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Priority to CN 200910260313 priority Critical patent/CN101742383B/en
Publication of CN101742383A publication Critical patent/CN101742383A/en
Application granted granted Critical
Publication of CN101742383B publication Critical patent/CN101742383B/en

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Abstract

The invention discloses a device for eliminating plosives of a headset, which comprises a switch unit, a switch control unit and a discharge unit, wherein the switch unit is connected with a ground output end of a headset jack and a ground wire of the headset and used for realizing the physical on-off control of the ground wire of the headset; the switch control unit is used for sending a control signal to the switch unit when the state of the headset changes and controlling the disconnection and the closing of the switch unit; and the discharge unit is used for guiding instantaneous impact current generated by a power amplifier of the headset into the ground wire of the headset when the switch unit is disconnected. The invention further discloses a method for eliminating the plosives of the headset. The device can guide the instantaneous impact current generated by the power amplifier of the headset into the ground when the state of the headset changes through the switch unit for realizing the physical on-off control of the ground wire of the headset and the discharge unit, thereby eliminating the plosives generated by the power amplifier of the headset. The device and the method can fundamentally eliminate the plosives generated during the power-on, the power outage and the music switching processes of the headset, thereby improving the sound quality of the headset and meeting the requirement on high sound quality of a user.

Description

A kind of apparatus and method of eliminating earphone plosion

Technical field

The present invention relates to the electronic circuit technology field, particularly relate to a kind of elimination earphone and when powering on, cutting off the power supply moment and switching music, produce plosive apparatus and method.

Background technology

Along with development of electronic technology, portable equipment has been widely used each corner in people's modern life, becomes indispensable important tool in people's live and work.And earphone has also become indispensable subsidiary product on the various portable equipments, and for we listen to the music, receiving calls etc. offers convenience.

In some cases, we need portable equipment to send various audio-frequency informations by earphone, so just need power on and operation such as outage to earphone unavoidably.But generally in portable system, what audio-frequency module adopted all is the single power supply pattern, so the earphone power amplifier all has a dc offset voltage, this direct current biasing portable equipment power on to earphone and power process in, to produce a plosive, and give on user's sense organ and bring discomfort.

Industry mainly contains plosive solution at present:

(1) by increasing the shunt capacitance of dc offset voltage, can slow down the speed that dc offset voltage rises, descends, play and reduce plosive effect; Its shortcoming is to suppress to make plosive DeGrain, but can not play the plosive effect of eliminating fully.And the big or small bad grasp of use shunt capacitance, if the shunt capacitance of using is less, suppress plosive DeGrain; Use shunt capacitance bigger, though helpful to suppressing plosive, user voice can not be come out for a long time, user experience is bad.

(2) by reducing the capacitance of earphone left and right acoustic channels, plosive amplitude is diminished, pulse duration narrows down.Because plosive energy mostly concentrates on high frequency, reduce capacitance and can reduce audible noise.The shortcoming of this method is: because the capacitance and the earphone load of earphone left and right sound channels have constituted a high pass filter, when reducing capacitance, improved high pass filter by frequency, low cut to audio signal is more serious, the plosive that can suppress low frequency, but this just makes the demand of the tonequality of high-end user pursuing high quality be difficult to satisfy.

(3) by two switch elements, make the L channel output of audio decoder chip and voice signal that the R channel output is exported power on and be in ground state during power down, but in power supply stable back L channel output and R channel output operate as normal, this method can play inhibition audio decoder chip and produce plosive effect.There is certain defective in the method: the first, this method need be used two switch elements, and the control more complicated of switch, and is improper if switch element is selected, and will not have plosive inhibitory action; The second, this method can only solve audio frequency power amplifier at the plosive that powers on and exist power down the time, and the plosive that occurs when switching music does not play inhibitory action.

Summary of the invention

The problem to be solved in the present invention provides a kind of apparatus and method of eliminating earphone plosion, to overcome the defective that can not suppress earphone plosion in the prior art well.

For achieving the above object, technical scheme of the present invention provides a kind of device of eliminating earphone plosion, and described device comprises: switch element, be connected between the ground output and earphone ground wire of earphone socket, and be used to control the physics break-make of earphone ground wire; Switch control unit is used for transmitting control signal to described switch element when the earphone state changes, the disconnection of controlling described switch element with close; Discharge cell is used for when described switch element disconnects, and the moment impact electric current that the earphone power amplifier is produced imports the earphone ground wire.

Further, described switch element is metal oxide semiconductor circuit, thyristor circuit or triode circuit.

Further, described discharge cell comprises first discharge resistance and second discharge resistance, and an end of described first discharge resistance is connected with earphone R channel capacitance with earphone socket, and the other end connects the earphone ground wire; One end of described second discharge resistance is connected with earphone L channel capacitance with earphone socket, and the other end connects the earphone ground wire.

Further, the resistance value of described first discharge resistance and second discharge resistance is 10K Ω.

Further, described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.

Technical scheme of the present invention also provides a kind of method of eliminating earphone plosion, this method comprises: switch control unit judges whether the state of earphone needs to change, if, then control switch unit, the moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the earphone ground wire by discharge cell, and then eliminates the plosive that the earphone power amplifier produces when the earphone state changes.

Further, described switch element is metal oxide semiconductor circuit, thyristor circuit or triode circuit, the described step that controls switch unit, specifically comprise: switch control unit transmits control signal to described switch element, and control metal oxide semiconductor circuit, thyristor circuit or triode circuit end.

Further, after the moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the earphone ground wire by discharge cell, also comprise the step that controls switch unit, specifically comprise: switch control unit transmits control signal to described switch element, control metal oxide semiconductor circuit, thyristor circuit or triode circuit turn-on.

Further, the described moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the step of earphone ground wire by discharge cell, and specifically comprise: the moment impact electric current that produces at the earphone R channel imports the earphone ground wire by first discharge resistance; The moment impact electric current that the earphone L channel produces imports the earphone ground wire by second discharge resistance.

Further, described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.

Compared with prior art, beneficial effect of the present invention is as follows:

The present invention is by the switch element and the discharge cell of a control earphone ground wire physics break-make, and the moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports ground, and then eliminates the plosive that produces at the earphone power amplifier.The present invention can fundamentally eliminate earphone powering on, cut off the power supply and switching the plosive that produces in the music process, improves the tonequality of earphone, satisfies the requirement of user to high tone quality.

Description of drawings

Fig. 1 is a kind of circuit theory diagrams of eliminating the device of earphone plosion of the embodiment of the invention;

Fig. 2 is a kind of flow chart of eliminating the method for earphone plosion of the embodiment of the invention.

Wherein, 1 is earphone socket, and 2 is earphone Mike line, and 3 is earphone R channel line, and 4 is earphone L channel line, and 5 is control signal, and S1 is a switch element.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.

A kind of device of eliminating earphone plosion of the embodiment of the invention comprises switch element, switch control unit and discharge cell.Switch element is connected between the ground output and earphone ground wire of earphone socket, is used to control the physics break-make of earphone ground wire; Switch control unit is used for transmitting control signal to switch element when the earphone state changes, the disconnection of control switch unit with close; Discharge cell is used for when switch element disconnects, and the moment impact electric current that the earphone power amplifier is produced imports the earphone ground wire.

The present invention is according to the course of work of earphone, by the physics break-make of switch element control earphone ground wire.Power on, cut off the power supply, switch the physical connection that processes such as music break the earphone ground wire at earphone, make earphone in this process, the left and right sound channels of earphone and the discharge cell on the left and right sound channels produce the loop, guarantee that the moment impact electric current that earphone is produced imports the earphone ground wire by discharge cell in this process, and then eliminate the plosive that earphone is produced in this process.

The embodiment of the invention a kind of eliminate earphone plosion device circuit theory diagrams as shown in Figure 1, comprise that switch element S1, two are to the discharge resistance R1 of transient impact discharge and R2, three partiting dc capacitor C1, C2, C3.Wherein, switch element S1 is MOS (Metal-Oxide-Semiconductor, metal-oxide semiconductor (MOS)) circuit, thyristor circuit or triode circuit, and switch element S1 is connected on the ground wire of earphone, the break-make of control earphone ground wire.Resistance R 1 one ends are connected on the earphone R channel line 3, and between earphone socket 1 and capacitance C2, the other end of resistance is connected on the ground wire.Resistance R 2 one ends are connected on the earphone L channel line 4, and between earphone socket 1 and capacitance C1, the other end of resistance is connected on the ground wire.R1 and R2 all adopt the resistance of 10K.

When using device shown in Figure 1, the method that the embodiment of the invention a kind of eliminates earphone plosion may further comprise the steps as shown in Figure 2:

Step s201 judges whether the state of earphone needs to change, if then change step s202, otherwise finish.The change of earphone state comprises: the earphone when earphone is wanted back sound information powers on, earphone does not need earphone outage, switching music behind work or the end-of-job.

Step s202, switch element S1 disconnects, and makes the earphone ground wire be in off-state.Switch element S1 is metal oxide semiconductor circuit, thyristor circuit or triode circuit.In the present embodiment, switch control unit transmits control signal to switch element S1, and control metal oxide semiconductor circuit, thyristor circuit or triode circuit end.

Step s203, earphone carry out state and change.Because the earphone ground wire is in off-state, so the impulse current of earphone will import the earphone ground wire by the loop that resistance R 1, R2 form.The moment impact electric current that produces at the earphone R channel imports the earphone ground wire by resistance R 1; The moment impact electric current that the earphone L channel produces imports the earphone ground wire by resistance R 2.

Step s204, switch element S1 closes.In the present embodiment, finish back switch element S1 at impulse current and close, earphone is transformed into new stable status.In the present embodiment, switch control unit transmits control signal to switch element S1, control metal oxide semiconductor circuit, thyristor circuit or triode circuit turn-on.

See figures.1.and.2, when earphone wanted back sound information to power on, at first switch control unit was a low level to the control signal 5 that switch element S1 sends, and switch element S1 is in off-state, and the ground output of earphone socket 1 is a high impedance to the earphone ground wire.The earphone power amplifier is opened then, dc offset voltage powers on because this moment the earphone L channel and R channel be differential arrangement, the impact that the dc offset voltage in earphone power amplifier L channel and the R channel output brings is cancelled out each other, just not having plosive outputs to earphone.Time-delay a period of time, transient impact Deng dc offset voltage behind stable and earphone L channel output and the R channel output capacitance has been released by R1 and R2 and has been finished, switch control unit becomes high level to the control signal 5 that switch element S1 sends, switch element S1 is in closure state, this moment earphone socket 1 ground output and earphone ground wire short circuit, the earphone operate as normal.

When needing to cut off the power supply after earphone does not need work or end-of-job, at first switch control unit is a low level to the control signal 5 that switch element S1 sends, and switch element S1 is in off-state, and the ground output of earphone socket 1 is a high impedance to the earphone ground wire.Then the earphone power amplifier close, the dc offset voltage power down because this moment, earphone L channel and R channel were differential arrangements, the impact that the dc offset voltage in earphone power amplifier L channel and the R channel output brings is cancelled out each other, just not having plosive outputs to earphone.

When earphone need switch music, at first switch control unit was a low level to the control signal 5 that switch element S1 sends, and switch element S1 is in off-state, and the ground output of earphone socket 1 is a high impedance to the earphone ground wire.Carry out the switching of music then, because this moment, earphone L channel and R channel were differential arrangements, the impact that the dc offset voltage in earphone power amplifier L channel and the R channel output brings is cancelled out each other, and just not having plosive outputs to earphone.Time-delay a period of time, released Deng the transient impact behind earphone L channel output and the R channel output capacitance and to have finished by R1 and R2, switch control unit becomes high level No. 5 to the control letter that switch element S1 sends, switch element S1 is in closure state, this moment earphone socket 1 ground output and earphone ground wire short circuit, earphone switches to new music operate as normal.

Use the device that the present invention eliminates earphone plosion, can make the L channel and the R channel of earphone when the earphone power amplifier is opened, closed and switches music, be connected into difference form, effectively suppressed the plosive that the earphone power amplifier produces, and this circuit be simple, control is convenient, and cost is also lower.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. a device of eliminating earphone plosion is characterized in that, described device comprises:
Switch element is connected between the ground output and earphone ground wire of earphone socket, is used to control the physics break-make of earphone ground wire;
Switch control unit is used for transmitting control signal to described switch element when the earphone state changes, the disconnection of controlling described switch element with close;
Discharge cell is used for when described switch element disconnects, and the moment impact electric current that the earphone power amplifier is produced imports the earphone ground wire.
2. the device of elimination earphone plosion as claimed in claim 1 is characterized in that, described switch element is metal oxide semiconductor circuit, thyristor circuit or triode circuit.
3. the device of elimination earphone plosion as claimed in claim 1, it is characterized in that, described discharge cell comprises first discharge resistance and second discharge resistance, and an end of described first discharge resistance is connected with earphone R channel capacitance with earphone socket, and the other end connects the earphone ground wire; One end of described second discharge resistance is connected with earphone L channel capacitance with earphone socket, and the other end connects the earphone ground wire.
4. the device of elimination earphone plosion as claimed in claim 3 is characterized in that, the resistance value of described first discharge resistance and second discharge resistance is 10K Ω.
5. as the device of each described elimination earphone plosion of claim 1 to 4, it is characterized in that described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.
6. method of utilizing the described device of claim 1 to eliminate earphone plosion is characterized in that described method comprises:
Switch control unit judges whether the state of earphone needs to change, if, then control switch unit, the moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the earphone ground wire by discharge cell, and then eliminates the plosive that the earphone power amplifier produces when the earphone state changes.
7. the method for elimination earphone plosion as claimed in claim 6, it is characterized in that, described switch element is metal oxide semiconductor circuit, thyristor circuit or triode circuit, the described step that controls switch unit specifically comprises: switch control unit transmits control signal to described switch element, and control metal oxide semiconductor circuit, thyristor circuit or triode circuit end.
8. the method for elimination earphone plosion as claimed in claim 7, it is characterized in that, after the moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the earphone ground wire by discharge cell, also comprise the step that controls switch unit, specifically comprise: switch control unit transmits control signal to described switch element, control metal oxide semiconductor circuit, thyristor circuit or triode circuit turn-on.
9. the method for elimination earphone plosion as claimed in claim 6, it is characterized in that, the described moment impact electric current that the earphone power amplifier is produced when the earphone state changes imports the step of earphone ground wire by discharge cell, and specifically comprise: the moment impact electric current that produces at the earphone R channel imports the earphone ground wire by first discharge resistance; The moment impact electric current that the earphone L channel produces imports the earphone ground wire by second discharge resistance.
10. as the method for each described elimination earphone plosion of claim 6 to 9, it is characterized in that described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.
CN 200910260313 2009-12-15 2009-12-15 Device and method for eliminating plosives of headset CN101742383B (en)

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Application Number Priority Date Filing Date Title
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CN101742383B CN101742383B (en) 2013-06-05

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291645A (en) * 2011-06-29 2011-12-21 北京时代民芯科技有限公司 Explodent elimination circuit
CN102638741A (en) * 2011-02-11 2012-08-15 上海闻泰电子科技有限公司 Method for fully eliminating earphone POP noise
CN103024632A (en) * 2012-12-30 2013-04-03 青岛歌尔声学科技有限公司 Noise reduction device of earphone
CN103139689A (en) * 2011-11-23 2013-06-05 安凯(广州)微电子技术有限公司 Device and method for eliminating popping sound of earphone
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
WO2016086805A1 (en) * 2014-12-04 2016-06-09 青岛歌尔声学科技有限公司 Audio processing circuit for eliminating plug-in and plug-out noise of earphone, and line control earphone
CN106131749A (en) * 2016-08-01 2016-11-16 深圳市福智软件技术有限公司 A kind of method eliminating insertion audio frequency apparatus POP sound
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
CN107889024A (en) * 2017-11-21 2018-04-06 深圳市沃特沃德股份有限公司 Voicefrequency circuit and vehicle control syetem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6016352A (en) * 1997-11-20 2000-01-18 Intel Corporation Low distortion audio muting circuit
TWI327871B (en) * 2006-01-05 2010-07-21 Chunghwa Picture Tubes Ltd Circuit for suppressing audio noise
CN201153322Y (en) * 2007-12-06 2008-11-19 中兴通讯股份有限公司 Audio circuit
CN201216013Y (en) * 2008-06-06 2009-04-01 青岛海信电器股份有限公司 Mute circuit for earphone

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102638741A (en) * 2011-02-11 2012-08-15 上海闻泰电子科技有限公司 Method for fully eliminating earphone POP noise
CN102638741B (en) * 2011-02-11 2017-10-13 上海闻泰电子科技有限公司 The method of earphone POP noise is completely eliminated
CN102291645A (en) * 2011-06-29 2011-12-21 北京时代民芯科技有限公司 Explodent elimination circuit
CN102291645B (en) * 2011-06-29 2013-12-18 北京时代民芯科技有限公司 Explodent elimination circuit
CN103139689A (en) * 2011-11-23 2013-06-05 安凯(广州)微电子技术有限公司 Device and method for eliminating popping sound of earphone
CN103024632A (en) * 2012-12-30 2013-04-03 青岛歌尔声学科技有限公司 Noise reduction device of earphone
CN103024632B (en) * 2012-12-30 2016-06-01 青岛歌尔声学科技有限公司 A kind of noise reduction device of earphone
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
WO2016086805A1 (en) * 2014-12-04 2016-06-09 青岛歌尔声学科技有限公司 Audio processing circuit for eliminating plug-in and plug-out noise of earphone, and line control earphone
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
CN106131749A (en) * 2016-08-01 2016-11-16 深圳市福智软件技术有限公司 A kind of method eliminating insertion audio frequency apparatus POP sound
CN106131749B (en) * 2016-08-01 2017-08-25 深圳市福智软件技术有限公司 A kind of method for eliminating insertion audio frequency apparatus POP sound
CN107889024A (en) * 2017-11-21 2018-04-06 深圳市沃特沃德股份有限公司 Voicefrequency circuit and vehicle control syetem

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