CN105187992B - a kind of microphone switch control circuit and method - Google Patents
a kind of microphone switch control circuit and method Download PDFInfo
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- CN105187992B CN105187992B CN201510617194.4A CN201510617194A CN105187992B CN 105187992 B CN105187992 B CN 105187992B CN 201510617194 A CN201510617194 A CN 201510617194A CN 105187992 B CN105187992 B CN 105187992B
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Abstract
The invention discloses a kind of microphone switch control circuit and method, control circuit is arranged at earphone end, and earphone end includes microphone, switch, and control circuit includes the first logic circuit, the second logic circuit；The first end of the input terminal and switch of first the second logic circuit of termination of microphone, the output end of the second logic circuit and the second end of switch connect the input terminal of the first logic circuit respectively, and the second end of microphone and the output end of the first logic circuit are grounded jointly；When switch is closed, control circuit controls the AC signal shorted to earth in microphone output signal, and direct current signal is opened a way over the ground；And when switch carries out on off operating mode variation, inhibit the too fast variation of level on microphone output signal.Microphone switch control circuit disclosed by the invention will not allow control terminal to be identified as mute button long-press, avoid the possible maloperation of control terminal while realizing mute, effectively inhibit the explosion sound noise of switch on and off moment, and scheme is implemented simply, of low cost.
Description
Technical field
The present invention relates to electronic device field, more particularly to a kind of microphone switch control circuit and method.
Background technology
There are mainly two types of modes for the current design for ear microphone switch：
First way：Special mute button is defined, by operating mute button, by MCU/Codec (microcontroller lists
Member/coder) carry out the mute of software respective channel.
This mode carries out corresponding mute and stops mute operation by software timing control, can effectively inhibit explosion
Noise sound.It, then can not be real in this way but for mute button and control box (MCU/Codec) not in the design of one
It is existing.For example control box is connected to earphone end by tone frequency channel wire, microphone switch is located at earphone end, is limited to the port (4- of audio jack
Position, L/R/GND/MIC left/right/ground/microphone signal) then it cannot achieve.
The second way：The break-make of microphone is directly controlled using switch：
Meeting auto-returned after touch-switch, hand being used to decontrol, the mute button of current most earphone use this
The switch of sample；Toggle switch can also be used, such as some applications, using the design of MIC boom, then it is mostly to stir to match combination switch
Switch.
Using series system：Fig. 1 is tandem type microphone switch circuit diagram in the prior art, as shown in Figure 1, switch
It is serially connected with microphone circuit, switch is closed, then microphone is connected；Switch disconnects, then microphone disconnects, and realizes mute.This side
Formula can generate explosion sound noise in switch on and off moment because of signal jitter.
Using parallel way：Fig. 2 is parallel connection type microphone switch circuit diagram over the ground in the prior art, as shown in Fig. 2,
Switch connects microphone output signal over the ground, and switch disconnects, then microphone is connected；Switch is closed, then microphone disconnects, and is realized quiet
Sound.Current mobile devices many on the market, using following design method：Realized when mute button short-press it is mute, it is mute to press
Bond distance can allow host to enter a certain pattern, such as speech recognition on time.According to mode in parallel over the ground is switched, when switch pair
Ground unicom then means mute button long-press, and relevant equipment may be made to enter certain pattern, cause maloperation problem, to use
It makes troubles at family.
Invention content
The present invention provides a kind of microphone switch control circuit and methods, are opened with solving the existing microphone of parallel connection type over the ground
Control terminal maloperation problem caused by possibility when closing operation, and avoid the explosion sound noise of switch on and off moment.
One side according to the present invention is arranged the present invention provides a kind of microphone switch control circuit at earphone end,
The earphone end includes microphone, switch, which is characterized in that the control circuit includes the first logic circuit, the second logic electricity
Road；
The first end of the input terminal and the switch of first termination second logic circuit of the microphone, described the
The second end of the output end of two logic circuits and the switch connects the input terminal of first logic circuit, the microphone respectively
Second end and the output end of first logic circuit be grounded jointly；
First logic circuit coordinates with second logic circuit, is used for when the switch is closed, described in control
AC signal shorted to earth realization in microphone output signal is mute, and controls the letter of the direct current in the microphone output signal
Open circuit avoids the maloperation of control terminal number over the ground；And when the switch carries out on off operating mode variation, inhibit the microphone
The too fast variation of level in output signal, avoids the explosion sound noise of the switch on and off moment.
Wherein, first logic circuit is specifically used for second logic circuit cooperation：
It is switched in the closure state when described, the second logic circuit short circuit, in the microphone output signal
AC signal is mute by the first logic circuit shorted to earth realization, and the direct current signal in the microphone output signal
It is opened a way over the ground by first logic circuit and avoids the maloperation of control terminal；
When the switch jumps to off-state from closed state, the microphone output signal is patrolled by described second
It collects circuit and charging delay is carried out to first logic circuit, inhibit the too fast variation of level on the microphone output signal；
When the switch is off, the microphone output signal is by second logic circuit to described
First logic circuit completes charging；
When the switch jumps to closed state from off-state, second logic circuit is described using having charged
First logic circuit delaying current flows through, and inhibits the too fast variation of level on the microphone output signal, and the Mike
AC signal in wind output signal is realized mute by the first logic circuit shorted to earth.
Wherein, first logic circuit includes direct-to-ground capacitance；
The first end of the direct-to-ground capacitance terminates second logic circuit as the input of first logic circuit
Output end；
The second end of the direct-to-ground capacitance terminates the second end of the microphone as the output of first logic circuit.
Wherein, second logic circuit includes first resistor and bridging diode；
The connecting pin of the anode of the first termination bridging diode of the first resistor, as second logic electricity
The input terminal on road；
The connecting pin of the cathode of the second termination bridging diode of the first resistor, as second logic electricity
The output end on road.
Preferably, the earphone end further includes the first magnetic bead；
After the second end of the second termination microphone of the direct-to-ground capacitance, it is grounded by first magnetic bead.
Preferably, the earphone end further includes the second magnetic bead and second resistance；
The first end of second magnetic bead connect respectively the first end of the microphone, the first end of the first resistor, across
Connect the first end of the positive and described switch of diode；
The microphone bias voltage of first termination control terminal of the second resistance；
The connecting pin of the second end of the second termination second resistance of second magnetic bead, as earphone end to control terminal
Output end.
Another aspect according to the present invention, the present invention provides a kind of microphone switch control methods, including：
Increase the first logic circuit and the second logic circuit, the first termination the second logic electricity of microphone at earphone end
The input terminal on road and the first end of switch, the output end of second logic circuit connect described respectively with the second end of the switch
The input terminal of first logic circuit, the second end of the microphone and the output end of first logic circuit are grounded jointly；
First logic circuit coordinates with second logic circuit, and when switching closure, it is defeated to control the microphone
The AC signal shorted to earth realization gone out in signal is mute, and the direct current signal controlled in the microphone output signal is opened over the ground
Road avoids the maloperation of control terminal；And when the switch carries out on off operating mode variation, inhibit the microphone output signal
On the too fast variation of level, avoid the explosion sound noise of the switch on and off moment.
Wherein, described when the switch carries out on off operating mode variation, inhibit the level on the microphone output signal
Too fast variation avoids the explosion sound noise of the switch on and off moment, including：
When the switch jumps to off-state from closed state, patrolled described first by second logic circuit
It collects circuit and carries out charging delay, inhibit the too fast variation of level on the microphone output signal；
When the switch jumps to closed state from off-state, it is delayed using first logic circuit to have charged
Electric current flows through in second logic circuit, inhibits the too fast variation of level on the microphone output signal, avoids explosion sound
Noise.
Wherein, the first logic circuit includes direct-to-ground capacitance；
Using the direct-to-ground capacitance control the AC signal shorted to earth in the microphone output signal realize it is mute, and
It controls the direct current signal in the microphone output signal and opens a way over the ground and avoid the maloperation of control terminal.
Wherein, second logic circuit includes first resistor and bridging diode；
The first resistor is connected with first logic circuit, when the switch jumps to disconnection shape from closed state
When state, charging delay is carried out to the first logic circuit, avoids explosion sound noise；
By the bridging diodes in parallel to the both ends of the first resistor, the switch is inhibited to be jumped to from off-state
When closed state, the too fast variation of level on the microphone output signal avoids explosion sound noise.
The beneficial effects of the invention are as follows:In microphone switch control circuit control microphone output signal provided by the invention
AC signal shorted to earth realize mute, and the direct current signal controlled in the microphone output signal is opened a way over the ground, will not
It allows control terminal to be identified as mute button long-press, so as to avoid control terminal maloperation, and switch is effectively inhibited to carry out break-make
The too fast variation of level when state change on microphone output signal, avoids the explosion sound noise of switch on and off moment.This hair
The microphone switch control circuit of bright offer increases hardware circuit at earphone end, and the simple characteristic for relying on hardware device is realized quiet
While sound and control terminal maloperation is avoided, and effectively inhibits the explosion sound noise of switch on and off moment, does not need software
Cooperation, scheme are implemented simple and of low cost.
Description of the drawings
Fig. 1 is tandem type microphone switch circuit diagram in the prior art；
Fig. 2 is parallel connection type microphone switch circuit diagram over the ground in the prior art；
Fig. 3 is microphone switch control circuit schematic diagram provided in an embodiment of the present invention；
Fig. 4 is microphone switch control circuit physical circuit figure provided in an embodiment of the present invention；
Fig. 5 is microphone switch control method flow chart provided in an embodiment of the present invention；
Fig. 6 is that microphone switch control circuit acoustical behavior provided in an embodiment of the present invention tests design sketch.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 3 is microphone switch control circuit schematic diagram provided in an embodiment of the present invention.As shown in figure 3, the present invention is implemented
The microphone switch control circuit that example provides is arranged at earphone end, and earphone end includes microphone MIC, switch SW, the control circuit
Including the first logic circuit, the second logic circuit；
The first end of the input terminal and switch SW of first the second logic circuit of termination of microphone MIC, the second logic circuit
The second end of output end and switch SW connect the input terminal of the first logic circuit respectively, the second end of microphone MIC is patrolled with first
The output end for collecting circuit is grounded jointly；
First logic circuit and the second logic circuit coordinate, for when switch SW is closed, controlling microphone output signal
AC signal shorted to earth realization in MIC_SIG is mute, and controls the direct current signal pair in microphone output signal MIC_SIG
Ground, which is opened a way, avoids the maloperation of control terminal；And when switch SW carries out on off operating mode variation, inhibit microphone output signal
The too fast variation of level on MIC_SIG, avoids the explosion sound noise of switch SW break-make moments.
First logic circuit is specifically used for the cooperation of the second logic circuit：
When switch SW in the closure state, the short circuit of the second logic circuit, the exchange in microphone output signal MIC_SIG
Signal is mute by the realization of the first logic circuit shorted to earth, and the direct current signal in microphone output signal MIC_SIG passes through
First logic circuit opens a way avoid the maloperation of control terminal over the ground；
When switch SW jumps to off-state from closed state, microphone output signal MIC_SIG passes through the second logic
The first logic circuit of circuit pair carries out charging delay, inhibits the too fast variation of level on microphone output signal MIC_SIG；
When switch SW is off, microphone output signal MIC_SIG is patrolled by the second logic circuit pair first
It collects circuit and completes charging；
When switch SW jumps to closed state from off-state, the second logic circuit utilizes the first logic electricity to have charged
Road delaying current flows through, and inhibits the too fast variation of level on microphone output signal MIC_SIG, and microphone output signal
AC signal in MIC_SIG is realized mute by the first logic circuit shorted to earth.
Fig. 4 is microphone switch control circuit physical circuit figure provided in an embodiment of the present invention.As shown in figure 4, first patrols
It includes direct-to-ground capacitance C1 to collect circuit；The first end of direct-to-ground capacitance C1 terminates the second logic circuit as the input of the first logic circuit
Output end；Second end of the second end of direct-to-ground capacitance as the output termination microphone of the first logic circuit.
Second logic circuit includes first resistor R1 and bridging diode D1；The first two poles of termination bridging of first resistor R1
The connecting pin of the anode of pipe D1, the input terminal as the second logic circuit；The second termination bridging diode D1 of first resistor R1
Cathode connecting pin, the output end as the second logic circuit.
When switch sw is closed, first resistor R1 short circuit, microphone output signal MIC_SIG by direct-to-ground capacitance C1 over the ground
Short circuit is realized mute.
When switch SW is from when being closed into disconnection, microphone output signal MIC_SIG is by first resistor R1 to direct-to-ground capacitance
C1 charges, and the clamping action of bridging diode D1 can effectively avoid switch on and off moment microphone output signal MIC_SIG
On have a big level fluctuation, the presence of first resistor R1 and bridging diode D1 inhibit microphone output signal MIC_ well
The too fast variation of level on SIG avoids generating explosion sound noise.
When switch SW is from when being disconnected to closure, the both ends direct-to-ground capacitance C1 are charged, then moment there is no electric current to flow through first
Resistance R1 avoids the instant jitter of microphone output signal MIC_SIG, inhibits explosion sound noise.The letter of microphone output simultaneously
Number MIC_SIG can be realized mute by direct-to-ground capacitance C1 shorted to earths.
When switch sw is closed, it is open circuit to direct current signal, so will not make in microphone output signal MIC_SIG
Direct current signal is grounded, and control terminal detection will not be allowed to be identified as mute button long-press, to avoid enter into the corresponding pattern of long-press, kept away
Exempt from control terminal maloperation.
In the preferred embodiment of the present invention, earphone end further includes the first magnetic bead L1；The second termination wheat of ground capacitance C1
After the second end of gram wind, passes through the first magnetic L1 pearls and be grounded.
In another preferred embodiment of the present invention, earphone end further includes the second magnetic bead L2 and second resistance R2；Second magnetic
The first end of pearl L2 connects the first end of microphone, the first end of first resistor R1, the anode for bridging diode D1 and opens respectively
Close the first end of SW；
The microphone bias voltage MIC_BIAS of the first termination control terminal of second resistance R2；
The connecting pin of the second end of the second termination second resistance R2 of second magnetic bead L2, as earphone end to the defeated of control terminal
Outlet.
Fig. 5 is microphone switch control method flow chart provided in an embodiment of the present invention.As shown in figure 5, this method includes：
Step S510：Increase the first logic circuit and the second logic circuit, the first termination second of microphone at earphone end
The input terminal of logic circuit and the first end of switch, the output end of the second logic circuit and the second end of switch connect first and patrol respectively
The input terminal of circuit is collected, the second end of microphone and the output end of the first logic circuit are grounded jointly.
Step S520：First logic circuit and the second logic circuit coordinate, when switching closure, control microphone output letter
AC signal shorted to earth in number is realized mute, and controls the direct current signal in microphone output signal and opens a way over the ground and avoid controlling
The maloperation at end processed.
Step S530：When switch carries out on off operating mode variation, inhibits the too fast variation of level on microphone output signal, keep away
Exempt from the explosion sound noise of switch on and off moment.
Wherein, step S530 is specifically included：
When switch jumps to off-state from closed state, filled by second the first logic circuit of logic circuit pair
Electricity delay, inhibits the too fast variation of level on microphone output signal；
When switch jumps to closed state from off-state, the first logic circuit the second logic of delay to have charged is utilized
Electric current flows through in circuit, inhibits the too fast variation of level on microphone output signal, avoids explosion sound noise.
In an embodiment of microphone switch control method provided by the invention, the first logic circuit includes electric over the ground
Hold；It is mute using the AC signal shorted to earth realization in direct-to-ground capacitance control microphone output signal, and it is defeated to control microphone
The direct current signal gone out in signal opens a way avoid the maloperation of control terminal over the ground.
In another embodiment of microphone switch control method provided by the invention, the second logic circuit includes the first electricity
Resistance and bridging diode；First resistor is connected with the first logic circuit, when switch jumps to off-state from closed state,
Charging delay is carried out to the first logic circuit, avoids explosion sound noise；
By bridging diodes in parallel to the both ends of first resistor, when switch being inhibited to jump to closed state from off-state,
The too fast variation of level on microphone output signal, avoids explosion sound noise.
Fig. 6 is that microphone switch control circuit acoustical behavior provided in an embodiment of the present invention tests design sketch.Such as Fig. 6 institutes
Show, microphone switch control circuit provided by the invention is verified by actual test, and the index of acoustical testing is met the requirements, wheat
Gram wind ON-OFF control circuit does not generate harmful effect, microphone switch break-make moment, explosion sound noise to the performance of microphone
It is effectively suppressed.
In conclusion a kind of microphone switch control circuit provided by the invention and method have compared with prior art
Following advantageous effect：
1, the AC signal in microphone switch control circuit control microphone output signal provided by the invention is short over the ground
Road realization is mute, and the direct current signal controlled in the microphone output signal is opened a way over the ground, control terminal will not be allowed to be identified as quiet
Tone keys long-press, so as to avoid control terminal maloperation.
2, microphone switch control circuit provided by the invention, Mike when switch effectively being inhibited to carry out on off operating mode variation
The too fast variation of level in wind output signal, avoids the explosion sound noise of switch on and off moment.
3, microphone switch control circuit provided by the invention increases hardware circuit at earphone end, relies on hardware device merely
The characteristic of part while realizing mute and avoids control terminal maloperation, and effectively inhibits the explosion noise of switch on and off moment
Sound, does not need the cooperation of software, and scheme is implemented simple and of low cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of microphone switch control circuit is arranged at earphone end, the earphone end includes microphone, switch, and feature exists
In the control circuit includes the first logic circuit, the second logic circuit；
The first end of the input terminal and the switch of first termination second logic circuit of the microphone, described second patrols
The output end of volume circuit connects the input terminal of first logic circuit with the second end of the switch respectively, and the of the microphone
Two ends and the output end of first logic circuit are grounded jointly；
First logic circuit coordinates with second logic circuit, for when the switch is closed, controlling the Mike
AC signal shorted to earth realization in wind output signal is mute, and controls the direct current signal pair in the microphone output signal
Ground, which is opened a way, avoids the maloperation of control terminal；And when the switch carries out on off operating mode variation, the microphone is inhibited to export
The too fast variation of level on signal, avoids the explosion sound noise of the switch on and off moment；And when the switch is in disconnection
When state, the microphone output signal is completed to charge by second logic circuit to first logic circuit.
2. microphone switch control circuit as described in claim 1, which is characterized in that first logic circuit and described the
The cooperation of two logic circuits is specifically used for：
It is switched in the closure state when described, the second logic circuit short circuit, the exchange in the microphone output signal
Signal is mute by the first logic circuit shorted to earth realization, and the direct current signal in the microphone output signal passes through
First logic circuit is opened a way over the ground avoids the maloperation of control terminal；
When the switch jumps to off-state from closed state, the microphone output signal passes through second logic electricity
Road carries out charging delay to first logic circuit, inhibits the too fast variation of level on the microphone output signal；
When the switch is off, the microphone output signal is by second logic circuit to described first
Logic circuit completes charging；
When the switch jumps to closed state from off-state, second logic circuit utilizes described first to have charged
Logic circuit delaying current flows through, and inhibits the too fast variation of level on the microphone output signal, and the microphone is defeated
The AC signal gone out in signal is realized mute by the first logic circuit shorted to earth.
3. microphone switch control circuit as claimed in claim 2, which is characterized in that first logic circuit includes over the ground
Capacitance；
The first end of the direct-to-ground capacitance terminates the output of second logic circuit as the input of first logic circuit
End；
The second end of the direct-to-ground capacitance terminates the second end of the microphone as the output of first logic circuit.
4. microphone switch control circuit as claimed in claim 2, which is characterized in that second logic circuit includes first
Resistance and bridging diode；
The connecting pin of the anode of the first termination bridging diode of the first resistor, as second logic circuit
Input terminal；
The connecting pin of the cathode of the second termination bridging diode of the first resistor, as second logic circuit
Output end.
5. microphone switch control circuit as claimed in claim 3, which is characterized in that the earphone end further includes the first magnetic
Pearl；
After the second end of the second termination microphone of the direct-to-ground capacitance, it is grounded by first magnetic bead.
6. microphone switch control circuit as claimed in claim 4, which is characterized in that the earphone end further includes the second magnetic bead
And second resistance；
The first end of second magnetic bead connects the first end of the microphone, the first end of the first resistor, bridging two respectively
The first end of the positive and described switch of pole pipe；
The microphone bias voltage of first termination control terminal of the second resistance；
The connecting pin of the second end of the second termination second resistance of second magnetic bead, as earphone end to the defeated of control terminal
Outlet.
7. a kind of microphone switch control method, which is characterized in that the method includes：
Increase the first logic circuit and the second logic circuit at earphone end, the first termination second logic circuit of microphone
The first end of input terminal and switch, the output end of second logic circuit connect described first respectively with the second end of the switch
The input terminal of logic circuit, the second end of the microphone and the output end of first logic circuit are grounded jointly；
First logic circuit coordinates with second logic circuit, when switching closure, controls the microphone output letter
AC signal shorted to earth in number is realized mute, and controls the direct current signal in the microphone output signal and opens a way over the ground and keep away
Exempt from the maloperation of control terminal；And when the switch carries out on off operating mode variation, inhibit on the microphone output signal
The too fast variation of level avoids the explosion sound noise of the switch on and off moment；And when the switch is off, institute
Microphone output signal is stated first logic circuit is completed to charge by second logic circuit.
8. microphone switch control method as claimed in claim 7, which is characterized in that described to carry out break-make shape in the switch
When state changes, inhibits the too fast variation of level on the microphone output signal, avoid the explosion sound of the switch on and off moment
Noise, including：
When the switch jumps to off-state from closed state, by second logic circuit to first logic electricity
Road carries out charging delay, inhibits the too fast variation of level on the microphone output signal；
When the switch jumps to closed state from off-state, described in first logic circuit delay charged
Electric current flows through in second logic circuit, inhibits the too fast variation of level on the microphone output signal, avoids explosion sound noise.
9. microphone switch control method as claimed in claim 8, which is characterized in that the first logic circuit includes electric over the ground
Hold；
The AC signal shorted to earth in the microphone output signal is controlled using the direct-to-ground capacitance and realizes mute, and is controlled
Direct current signal in the microphone output signal is opened a way over the ground avoids the maloperation of control terminal.
10. microphone switch control method as claimed in claim 8, which is characterized in that second logic circuit includes the
One resistance and bridging diode；
The first resistor is connected with first logic circuit, when the switch jumps to off-state from closed state
When, charging delay is carried out to the first logic circuit, avoids explosion sound noise；
By the bridging diodes in parallel to the both ends of the first resistor, the switch is inhibited to jump to closure from off-state
When state, the too fast variation of level on the microphone output signal avoids explosion sound noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510617194.4A CN105187992B (en) | 2015-09-24 | 2015-09-24 | a kind of microphone switch control circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510617194.4A CN105187992B (en) | 2015-09-24 | 2015-09-24 | a kind of microphone switch control circuit and method |
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| CN105187992A CN105187992A (en) | 2015-12-23 |
| CN105187992B true CN105187992B (en) | 2018-09-28 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979423B (en) * | 2016-06-28 | 2022-04-12 | 青岛歌尔声学科技有限公司 | Mute circuit and method of microphone on earphone |
| CN107548137A (en) * | 2016-06-29 | 2018-01-05 | 联芯科技有限公司 | The receiving channel switching method and device of a kind of radio frequency interface |
| CN107995372B (en) * | 2017-12-25 | 2020-04-07 | 维沃移动通信有限公司 | False touch grounding identification processing method and circuit and mobile terminal |
| TWI780385B (en) | 2019-12-17 | 2022-10-11 | 緯創資通股份有限公司 | Microphone device, telephone device and decoupling circuit |
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| US3706852A (en) * | 1971-01-04 | 1972-12-19 | Mc Graw Edison Co | Quiet turn-on circuit for carbon microphones |
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| CN103618982A (en) * | 2013-12-10 | 2014-03-05 | 联想(北京)有限公司 | Circuit and method for lowering far-end echoes, headset detecting circuit and method and headset |
| CN204993813U (en) * | 2015-09-24 | 2016-01-20 | 青岛歌尔声学科技有限公司 | Microphone ON -OFF control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3706852A (en) * | 1971-01-04 | 1972-12-19 | Mc Graw Edison Co | Quiet turn-on circuit for carbon microphones |
| CN101064742A (en) * | 2006-04-28 | 2007-10-31 | 佛山市顺德区顺达电脑厂有限公司 | Mute control device |
| CN101335500A (en) * | 2008-07-29 | 2008-12-31 | 深圳华为通信技术有限公司 | Method and circuit for eliminating breaking sound of audio circuit |
| CN201509235U (en) * | 2009-09-25 | 2010-06-16 | 宇龙计算机通信科技(深圳)有限公司 | Headphone detection circuit of mobile terminal and mobile terminal thereof |
| CN103618982A (en) * | 2013-12-10 | 2014-03-05 | 联想(北京)有限公司 | Circuit and method for lowering far-end echoes, headset detecting circuit and method and headset |
| CN204993813U (en) * | 2015-09-24 | 2016-01-20 | 青岛歌尔声学科技有限公司 | Microphone ON -OFF control circuit |
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|---|---|
| CN105187992A (en) | 2015-12-23 |
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