CN101742383B - Device and method for eliminating plosives of headset - Google Patents
Device and method for eliminating plosives of headset Download PDFInfo
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- CN101742383B CN101742383B CN 200910260313 CN200910260313A CN101742383B CN 101742383 B CN101742383 B CN 101742383B CN 200910260313 CN200910260313 CN 200910260313 CN 200910260313 A CN200910260313 A CN 200910260313A CN 101742383 B CN101742383 B CN 101742383B
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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
Technical field
The present invention relates to the electronic circuit technology field, particularly relate to a kind of elimination earphone and powering on, cutting off the power supply moment and produce plosive apparatus and method when switching music.
Background technology
Along with the 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 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 to power on and the operation such as outage to earphone unavoidably.But generally in portable system, what audio-frequency module adopted is all the single power supply pattern, so the earphone power amplifier has a dc offset voltage, this direct current biasing power on to earphone at portable equipment 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 larger, although helpful to suppressing plosive, allow the user voice for a long time can not be out, the user experiences 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 capacitance and the earphone load of earphone left and right sound channels have consisted of 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 demand that just makes high-end user pursue high-quality tonequality is 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, L channel output and R channel output can work after power supply is stable, and the method can play the plosive effect of audio decoder chip generation that suppresses.There is certain defective in the method: the first, the method need to 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, the method can only solve audio frequency power amplifier at the plosive that powers on and exist when power down, 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 is to provide a kind of apparatus and method of eliminating earphone plosion, to overcome the defective that can not suppress well earphone plosion in prior art.
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 for controlling 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, and controls the disconnection of described switch element and closes; 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 the first discharge resistance and the second discharge resistance, and an end of described the first discharge resistance is connected with earphone R channel capacitance with earphone socket, other end frames connecting with headphone ground wire; One end of described the second discharge resistance is connected with earphone L channel capacitance with earphone socket, other end frames connecting with headphone ground wire.
Further, the resistance value of described the first discharge resistance and the 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, the method comprises: switch control unit judges whether the state of earphone needs to change, if, 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, controls metal oxide semiconductor circuit, thyristor circuit or the cut-off of triode circuit.
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, controls 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, specifically comprise: the moment impact electric current that produces at the earphone R channel imports the earphone ground wire by the first discharge resistance; The moment impact electric current that the earphone L channel produces imports the earphone ground wire by the 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 switch element and a discharge cell of controlling 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 the plosive that earphone produces in powering on, cut off the power supply and switching the music process, improve the tonequality of earphone, satisfies the user to the requirement of 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 present invention;
Fig. 2 is a kind of flow chart of eliminating the method for earphone plosion of the embodiment of the present 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 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 for explanation 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 present 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 for controlling 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 and closing; 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 controls the physics break-make of earphone ground wire according to the course of work of earphone by switch element.Power on, cut off the power supply, switch the physical connection that the 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 left and right sound channels produce the loop, guarantee that the moment impact electric current that earphone produces imports the earphone ground wire by discharge cell in this process, and then eliminate the plosive that earphone produces in this process.
The embodiment of the present 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, controls the break-make of earphone ground wire.Resistance R 1 one ends are connected on earphone R channel line 3, and between earphone socket 1 and capacitance C2, the other end of resistance is connected on ground wire.Resistance R 2 one ends are connected on earphone L channel line 4, and between earphone socket 1 and capacitance C1, the other end of resistance is connected on ground wire.R1 and R2 all adopt the resistance of 10K.
When using device shown in Figure 1, a kind of method that the embodiment of the present invention eliminates earphone plosion comprises the following steps as shown in Figure 2:
Step s201 judges whether the state of earphone needs to change, and if so, turns step s202, otherwise finishes.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 after work or 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, controls metal oxide semiconductor circuit, thyristor circuit or the cut-off of triode circuit.
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, switch element S1 closes after impulse current finishes, and earphone is transformed into new stable state.In the present embodiment, switch control unit transmits control signal to switch element S1, controls 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 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 high impedance to the earphone ground wire.Then the earphone power amplifier is opened, 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 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 after stable and earphone L channel output and R channel output capacitance has been released complete by R1 and R2, 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, earphone normal operation.
When needing to cut off the power supply after earphone does not need work or end-of-job, at first switch control unit is 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 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 R channel output brings is cancelled out each other, just not having plosive outputs to earphone.
When earphone need to switch music, at first switch control unit was 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 high impedance to the earphone ground wire.Then carry out the switching of music, 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 R channel output brings is cancelled out each other, and just not having plosive outputs to earphone.Time-delay a period of time, released complete by R1 and R2 Deng the transient impact after earphone L channel output and R channel output capacitance, 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 the normal operation of new music.
Use the device that the present invention eliminates earphone plosion, can make L channel and the R channel of earphone be connected into difference form when the earphone power amplifier is opened, closed and switches music, effectively suppressed the plosive that the earphone power amplifier produces, and this circuit be simple, it is convenient to control, and cost is also lower.
The above is only the preferred embodiment 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 for controlling the physics break-make of earphone ground wire, and when switch element disconnected, the ground output of earphone socket and earphone ground wire disconnected;
Switch control unit is used for transmitting control signal to described switch element when the earphone state need to change, and controls the disconnection of described switch element and closes;
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 the first discharge resistance and the second discharge resistance, and an end of described the first discharge resistance is connected with earphone R channel capacitance with earphone socket, other end frames connecting with headphone ground wire; One end of described the second discharge resistance is connected with earphone L channel capacitance with earphone socket, other end frames connecting with headphone ground wire.
4. the device of elimination earphone plosion as claimed in claim 3, is characterized in that, the resistance value of described the first discharge resistance and the second discharge resistance is 10K Ω.
5. the device of elimination earphone plosion as described in claim 1 to 4 any one, is characterized in that, described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.
6. a 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, 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, controls metal oxide semiconductor circuit, thyristor circuit or the cut-off of triode circuit.
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 the control switch unit is closed, specifically comprise: switch control unit transmits control signal to described switch element, controls 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, specifically comprise: the moment impact electric current that produces at the earphone R channel imports the earphone ground wire by the first discharge resistance; The moment impact electric current that the earphone L channel produces imports the earphone ground wire by the second discharge resistance.
10. the method for elimination earphone plosion as described in claim 6 to 9 any one, is characterized in that, described earphone state change comprises: earphone powers on, earphone cuts off the power supply or switch music.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910260313 CN101742383B (en) | 2009-12-15 | 2009-12-15 | Device and method for eliminating plosives of headset |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910260313 CN101742383B (en) | 2009-12-15 | 2009-12-15 | Device and method for eliminating plosives of headset |
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| CN101742383A CN101742383A (en) | 2010-06-16 |
| CN101742383B true CN101742383B (en) | 2013-06-05 |
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| CN 200910260313 Active CN101742383B (en) | 2009-12-15 | 2009-12-15 | Device and method for eliminating plosives of headset |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102291645B (en) * | 2011-06-29 | 2013-12-18 | 北京时代民芯科技有限公司 | Explodent elimination circuit |
| CN103139689B (en) * | 2011-11-23 | 2015-08-05 | 安凯(广州)微电子技术有限公司 | A kind of apparatus and method eliminating earphone plosion |
| 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 |
| CN104363547B (en) * | 2014-12-04 | 2017-09-26 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and line control earphone for eliminating headset plugging noise |
| 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 |
| 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 |
| CN111263268B (en) * | 2020-01-15 | 2022-02-01 | 深圳创维数字技术有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
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| US6016352A (en) * | 1997-11-20 | 2000-01-18 | Intel Corporation | Low distortion audio muting circuit |
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| CN101742383A (en) | 2010-06-16 |
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