CN106535037B - Audio output system and its control method - Google Patents
Audio output system and its control method Download PDFInfo
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- CN106535037B CN106535037B CN201510573325.3A CN201510573325A CN106535037B CN 106535037 B CN106535037 B CN 106535037B CN 201510573325 A CN201510573325 A CN 201510573325A CN 106535037 B CN106535037 B CN 106535037B
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Abstract
Audio output system includes generating circuit from reference voltage, output-stage circuit, switch, charge pump circuit and control circuit.Generating circuit from reference voltage provides reference voltage.Output-stage circuit is according to reference voltage and the first signal to generate audio output signal.Switch is coupled between the output end of output-stage circuit and ground terminal.Charge pump circuit exports bias voltage with bias output-stage circuit.Control circuit is coupled to switch, charge pump circuit and generating circuit from reference voltage.Control circuit provides first control signal control switch, and provides second control signal control charge pump circuit, and provides third control signal control generating circuit from reference voltage.In a power-on operation, control circuit enable first control signal is to be connected switch, it is grounded output end, then enable second control signal exports bias voltage with enable charge pump circuit, enable third controls signal to start generating circuit from reference voltage and then enable output-stage circuit again later.
Description
Technical field
This exposure relates to a kind of audio output system, more particularly to a kind of audio output system for preventing sonic boom from generating
System.
Background technique
In start process, output end is easy to lead to the generation of sonic boom because of voltage change rapidly audio output system.
A kind of anti-sonic boom method is between the output end and loudspeaker of audio output system (for example, the printing of System on chip (SOC) outside
On circuit board) the biggish capacitor of a capacitance is coupled to slow down the voltage change of output end.It is defeated in audio that another kind, which does rule,
Out between the output end and loudspeaker of system (for example, printed circuit board on) outside SOC the larger capacitor of one capacitance of coupling is simultaneously
The operational amplifier with anti-sonic boom mechanism is coupled again.Above-mentioned both methods is all the circuit that sonic boom is separately taken over control outside SOC, this
A large amount of space can be occupied on a printed circuit, and will lead to the increase of circuit overall cost.Therefore, one kind how is provided not
It need to use to the biggish capacitor of above-mentioned capacitance or operational amplifier and can prevent the audio output system actually industry of sonic boom generation
It is eager to solve the problems, such as in boundary.
Summary of the invention
According to an embodiment of this exposure, a kind of audio output system is provided.Audio output system is produced comprising reference voltage
Raw circuit, output-stage circuit, switch, charge pump (charge pump) circuit and control circuit.Generating circuit from reference voltage mentions
Supply reference voltage.According to reference voltage and the first signal to generate audio output signal, output-stage circuit has output-stage circuit
Output end.Switch is coupled between the output end of output-stage circuit and ground terminal.Charge pump circuit exports bias voltage with bias
Output-stage circuit.Control circuit is coupled to switch, charge pump circuit and generating circuit from reference voltage.Control circuit provides the
One control Signal-controlled switch, and second control signal control charge pump circuit is provided, and provide third control signal control ginseng
Examine voltage generation circuit.In a power-on operation, control circuit enable first control signal terminates output so that switch is connected
Ground, then enable second control signal export bias voltage with enable charge pump circuit, and enable third controls signal to open again later
Dynamic generating circuit from reference voltage and then enable output-stage circuit.
According to another embodiment of this exposure, a kind of method for controlling audio output system is provided.This control method includes
Following steps.In a power-on operation, in a first time point, control circuit enable first control signal is led with enable switch
It is logical, it is grounded output end.In one second time point, control circuit enable second control signal is inclined with the output of enable charge pump circuit
Piezoelectricity pressure.In a third time point, control circuit enable third control signal to start generating circuit from reference voltage and enable is defeated
Grade circuit out.Wherein first time point is earlier than the second time point, and the second time point is earlier than third time point.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate institute's accompanying drawings
It is described in detail below.
Detailed description of the invention
1A figure show the circuit box schematic diagram of the audio output system according to one embodiment of this exposure.
1B figure show one of output-stage circuit examples of circuits in the audio output system of 1A figure.
2nd figure show the operation timing figure of the audio output system of 1A and 1B figure.
3rd figure show the circuit diagram that the audio output system of another embodiment is disclosed according to this.
4th figure show the control flow chart of the audio output system according to one embodiment of this exposure.
5th figure show the control flow chart that the audio output system of another embodiment is disclosed according to this.
Specific embodiment
1A figure show the circuit box schematic diagram of the audio output system 100 according to one embodiment of this exposure.Herein
In embodiment, audio output system 100 includes generating circuit from reference voltage 110, output-stage circuit 120, switch SW, charge pump
(charge pump) circuit 130 and control circuit 140.Generating circuit from reference voltage 110 provides reference voltage Vref to output
Grade circuit 120, output-stage circuit 120 generates audio output signal Sout according to reference voltage Vref and the first signal S1, defeated
Grade circuit 120 has output end Nout out.Switch SW be coupled to output-stage circuit 120 output end Nout and ground terminal GND it
Between.Charge pump circuit 130 exports bias voltage Vbias with bias output-stage circuit 120.Control circuit 140 be coupled to switch SW,
Charge pump circuit 130 and generating circuit from reference voltage 110.Control circuit 140 provides first control signal C1 control switch
SW, second control signal C2 control charge pump circuit 130 is provided, and third control signal C3 control reference voltage is provided and generates electricity
Road 110.
1B figure show one of output-stage circuit examples of circuits in the audio output system 100 of 1A figure.Implement herein
In example, output-stage circuit 120 can be reached by operational amplifier, but the present invention is not limited thereto.In this embodiment, defeated
Grade circuit 120 includes operational amplifier A2, resistance R3 and resistance R4 out.Operational amplifier A2 be biased in positive voltage bias VDD with
Negative voltage bias-VDD.Resistance R3 be coupled to input stage circuit 350 output end and operational amplifier A2 inverting input terminal it
Between.Resistance R4 is coupled between the inverting input terminal of operational amplifier A2 and the output end Nout of operational amplifier A2.Operation is put
The non-inverting input of big device A2 receives the reference voltage Vref that generating circuit from reference voltage 110 provides.This negative voltage bias
The bias voltage Vbias that is exported by charge pump circuit 130 of level-VDD provided.Output-stage circuit 120 is according to reference electricity
Press Vref and the first signal S1 to generate audio output signal Sout.The Dc bias level of audio output signal Sout is (i.e. defeated
The Dc bias level of the output end Nout of grade circuit 120 out) it is ground voltage level GND.
Referring to the 2nd figure, the 2nd figure show 100 operation timing of the audio output system figure of 1A and 1B figure.In detail
Ground is said, in a power-on operation, in time point t0, opens power supply, the level of operating voltage VDD is gradually risen to by zero volt
High levels.In time point t1, (in this instance, first control signal C1 is by low level by 140 enable first control signal C1 of control circuit
Standard changes into high levels), switch SW is connected, it is grounded output end Nout.Later, in time point t2,140 enable of control circuit
Second control signal C2 (in this instance, second control signal C2 changes into high levels by low level), with enable charge pump circuit
130 output bias voltage Vbias.Then at time point t3,140 enable third of control circuit controls signal C3 (in this instance, third
Control signal C3 and high levels changed by low level), output-stage circuit 120 is opened to start generating circuit from reference voltage 110
Initiating is made.
In this embodiment, control circuit 140 opens up by guide and closes SW, in the case where just booting unstable state
(i.e. when the output voltage of the output end Nout of output-stage circuit 120 is unstable) protects the output end Nout of output-stage circuit 120
Hold the level in 0V.Also, stable high levels state, and electricity are reached in the positive voltage level VDD of 120 bias of output-stage circuit
After the bias voltage Vbias that lotus pump circuit 130 provides reaches stable negative-VDD, control circuit 140 just starts
Generating circuit from reference voltage 110 provides reference voltage Vref to output-stage circuit 120, operates output-stage circuit 120 normally,
And then the output end Nout of output-stage circuit 120 is avoided to generate sharply voltage change and cause sonic boom.
If not opened up according to the sequence guide of the 2nd figure in the power-on operation of audio output system 100 and closing SW again sequentially
Enable charge pump circuit 130 and generating circuit from reference voltage 110, such as guide open up and close SW then while starting reference voltage production
Raw circuit 110 and charge pump circuit 130.In this case, due to output-stage circuit 120 just start when, charge pump circuit
130 output bias voltage Vbias not yet reach negative-VDD, therefore the back bias voltage voltage of output-stage circuit 120 is not yet
Stablize, the output voltage of the output end Nout of output-stage circuit 120 will change with the change of reference voltage Vref at this time,
And when the bias voltage Vbias that charge pump circuit 130 provides reaches stable negative-VDD, output-stage circuit 120
The output voltage of output end Nout can change into ground voltage level (0V) again.In this case, output-stage circuit 120
The rapidly voltage change of the output voltage of output end Nout will will lead to the generation of sonic boom.
Later, after first control signal C1 maintains one time section of enable, that is, wait until that output-stage circuit 120 is normal
It operates after generating stable output voltage, switchs to forbidden energy (in this instance, the first control in time point t4, first control signal C1
Signal C1 processed changes into low level by high levels) and switch SW is disconnected, and after time point t4, second control signal C2 and the
Three control signal C3 continue to that (in this instance, second control signal C2 and third control signal C3 and continue to tie up in enabled status
It is held in high levels), make generating circuit from reference voltage 110 and 130 normal operating of charge pump circuit and holds audio output system 100
General operation after row booting.
In this embodiment, audio output system 100 will not lead to the generation of sonic boom in power-off operation.In a shutdown
In operation (for example, after source of sound input signal is become silent mode (mute pattern)), in time point t5, control circuit
140 enable first control signal C1 (in this instance, first control signal C1 changes into high levels by low level), switch is connected
SW is grounded output end Nout.Later, in time point t6,140 forbidden energy third of control circuit controls signal C3 (in this instance, the
Three control signal C3 change into low level by high levels), it provides with forbidden energy generating circuit from reference voltage 110 and then no longer and refers to electricity
Press Vref to output-stage circuit 120.Then at time point t7,140 forbidden energy second control signal C2 of control circuit (in this instance,
Two control signal C2 change into low level by low high standard), with forbidden energy charge pump circuit 130.Later, in time point t8, electricity is closed
Therefore source, operating voltage VDD are gradually lowered by high levels (for example, VDD) to 0V, first control signal C1 is accordingly in the time
Point t9 changes into low level by high levels, and then disconnects switch SW.
Similarly, in this embodiment, in power-off operation, control circuit 140 opens up by guide and closes SW, in output stage
(output voltage of the output end Nout of output-stage circuit 120 is unstable in the case where unstable state when circuit 120 shuts down
When), so that the output end Nout of output-stage circuit 120 is maintained at the level of 0V.Also, keeping the normal of output-stage circuit 120
In the case where bias level (charge pump circuit 130 is not first namely closed, in the case where persistently providing bias voltage Vbias),
The first forbidden energy generating circuit from reference voltage 110 of control circuit 140 makes generating circuit from reference voltage 110 not provide reference voltage Vref,
To avoid in back bias voltage voltage instability timing (the case where level of back bias voltage voltage Vbias is not in-VDD of output-stage circuit 120
Under), the output voltage of the output end Nout of output-stage circuit 120 causes quick-fried as reference voltage Vref generates voltage change
Sound.After generating circuit from reference voltage 110 is disabled, sequentially forbidden energy charge pump circuit 130 and closing are electric for control circuit 140
Source finally just disconnects switch SW, therefore can be true so that the back bias voltage bias of output-stage circuit 120 and positive voltage bias are down to 0V
It protects the output voltage of the output end Nout of output-stage circuit 120 in entire shutdown programm and is held at the level of 0V without leading
Cause the generation of sonic boom.
The 3rd figure is please referred to, the 3rd figure is shown to be shown according to this circuit for disclosing the audio output system 300 of another embodiment
It is intended to.Audio output system 300 includes generating circuit from reference voltage 310, output-stage circuit 320, switch SW ', charge pump circuit
330 and control circuit 340.Generating circuit from reference voltage 310, output-stage circuit 320, the switch of this audio output system 300
The reference electricity of SW ', charge pump circuit 330 and control circuit 340 and 1A figure and the audio output system 100 in 1B figure
Press generation circuit 110, output-stage circuit 120, switch SW, charge pump circuit 130 and control circuit 140 that there is similar function
Can, it is not repeated to describe in this.In this embodiment, audio output system 300 further includes input stage circuit 350.Input stage electricity
Road 350 generates the first signal S1 according to reference voltage Vref and source of sound input signal Si n.In one embodiment, input stage electricity
Road 350 is reached by operational amplifier A1, however the present invention is not limited thereto.In this embodiment, input stage circuit 350
Include operational amplifier A1, resistance R1 and resistance R2.Operational amplifier A1 is biased in positive voltage level VDD and ground voltage level
GND.Resistance R1 is coupled between sound source input end Nin and the inverting input terminal of operational amplifier A1.Resistance R2 is coupled to fortune
It calculates between the inverting input terminal of amplifier A1 and the output end of operational amplifier A1.The non-inverting input of operational amplifier A1 terminates
Receive the reference voltage Vref that generating circuit from reference voltage 310 provides.
Output-stage circuit 320 is according to reference voltage Vref and the first signal S1 to generate audio output signal Sout.This sound
The Dc bias level of output signal Sout, that is, the Dc bias level of the output end Nout of output-stage circuit 320 are imitated, to connect
Ground voltage level GND.In this embodiment, the circuit structure phase of output-stage circuit 320 and the output-stage circuit 120 in 1B figure
Together, it is not repeated to describe in this.
In this embodiment, audio output system 300 further includes capacitor Cref, capacitor Cref and generating circuit from reference voltage
310 couplings.In power-on operation, by capacitor Cref, reference voltage Vref slowly can change into high levels by 0V, and can keep away
Exempt from the generation of sonic boom.The variation slope of reference voltage Vref and the capacitance size of capacitor Cref are related.Since human ear can be heard
Range be about 20Hz~20kHz sound, by make reference voltage Vref change frequency be less than 20Hz can avoid generate
Sonic boom.
4th figure show the control method flow chart of the audio output system according to one embodiment of this exposure.The method can
The audio output system 100 or 300 of control such as 1A figure, 1B figure or the 3rd figure, the method include the following steps.Firstly, executing
Step 410, in a power-on operation, in a first time point, control circuit enable first control signal is made so that a switch is connected
Output end ground connection.Then, step 420 is executed, at the second time point of Yu Yi, control circuit enable second control signal is with enable charge
Pump circuit exports bias voltage.Finally, execute step 430, in a third time point, control circuit enable third control signal with
Start generating circuit from reference voltage and enable output-stage circuit.
This control method opens up pass by using control circuit guide, so that the output end of output-stage circuit is maintained at ground connection
Level, and control circuit just starts generating circuit from reference voltage and provides after the level of output-stage circuit bias reaches and stablizes
Reference voltage and enable output-stage circuit, and then avoid the generation voltage change of the output end of output-stage circuit and cause sonic boom.
5th figure show the control method flow chart that the audio output system of another embodiment is disclosed according to this.Likewise,
The method is controllable as 1A figure, 1B scheme or the audio output system 100 or 300 of the 3rd figure.Step in this control method
510~step 530 is identical as step 410~430 of the 4th figure, is just not repeated to describe.In this embodiment, control method is more
Comprising step 540, tetra- time point of Yu Yi, control circuit forbidden energy first control signal, but continue enable second control signal with
Third controls signal.In this control method, step 510~540 are the power-on operation of audio output system, and in step 540
Later, the general operation after the executable booting of audio output system.
In other embodiments, control method further includes step 550~580, that is, the shutdown behaviour of audio output system
Make.After step 540, step 550 is executed, in a power-off operation, five time point of Yu Yi, control circuit enable first is controlled
Signal processed is grounded output end so that switch is connected.Then step 560, six time point of Yu Yi, control circuit forbidden energy third are executed
Signal is controlled with forbidden energy generating circuit from reference voltage, and then forbidden energy output-stage circuit.Later, step 570 is executed, when Yu Yi seven
Between point, control circuit forbidden energy second control signal is with forbidden energy charge pump circuit.Finally, executing step 580, eight time of Yu Yi
Point, first control signal disconnect switch.
Similarly, this control method can open up pass by control circuit guide, so that the output end of output-stage circuit is maintained at
It is grounded level, and in the case where the bias level of output-stage circuit keeps stablizing, control circuit first closes reference voltage generation
Circuit, then sequentially forbidden energy charge pump circuit and switch, it can be ensured that the output voltage of output-stage circuit be maintained at ground connection level without
It will lead to the generation of sonic boom.
According to above-described embodiment, a variety of audio output systems and its control method are provided.Audio output system includes ginseng
Examine voltage generation circuit, output-stage circuit, switch, charge pump circuit and control circuit.Generating circuit from reference voltage provides ginseng
Examine voltage.Output-stage circuit is according to reference voltage and the first signal to generate audio output signal.Switch is coupled to output stage electricity
Between the output end and ground terminal on road.Charge pump circuit exports bias voltage with bias output-stage circuit.Control circuit is coupled to
Switch, charge pump circuit and generating circuit from reference voltage.Control circuit provides first control signal control switch, and provides the
Two control signals control charge pump circuit, and provide third control signal control generating circuit from reference voltage.In a power-on operation
In, control circuit enable first control signal is grounded output end so that switch is connected, then enable second control signal is with enable electricity
Lotus pump circuit exports bias voltage, and to start generating circuit from reference voltage, enable exports enable third control signal in turn again later
Grade circuit.
This exposure also provides the control method of audio output system.This control method comprises the steps of.In a booting behaviour
In work, in a first time point, control circuit enable first control signal is grounded output end with enable switch conduction.Yu Yi
Second time point, control circuit enable second control signal export bias voltage with enable charge pump circuit.In the third time
Point, control circuit enable third control signal to start generating circuit from reference voltage enable output-stage circuit.Wherein first when
Between o'clock earlier than the second time point, the second time point is earlier than third time point.
In conclusion the audio output system and its control method of this exposure can be in the power-on operations of audio output system
Or in power-off operation, so that the voltage of output end is maintained at ground connection level and change without changing with reference voltage, keep away whereby
Exempt from the generation of sonic boom.Also, the audio output system of this exposure can be not required to the circuit of external anti-sonic boom on a printed circuit, can
The space on printed circuit board is greatlyd save, additional circuit cost will not be generated.
Although this exposure is disclosed above with multiple embodiments, so it is not limited to this exposure.Skill belonging to this exposure
Art has usually intellectual in field, in the spirit and scope for not departing from this exposure, may make various changes and modifications.Cause
This, subject to the protection scope of this exposure claim institute defender attached after view.
Claims (20)
1. a kind of audio output system, characterized by comprising:
One generating circuit from reference voltage provides a reference voltage；
One output-stage circuit, according to the reference voltage and one first signal to generate an audio output signal, the output-stage circuit
With an output end；
One switch, is coupled between the output end of the output-stage circuit and a ground terminal；
One charge pump (charge pump) circuit exports a bias voltage with the bias output-stage circuit；And
One control circuit, is coupled to the switch, the charge pump circuit and the generating circuit from reference voltage, which mentions
The switch is controlled for a first control signal, and a second control signal is provided and controls the charge pump circuit, and a third is provided
Control signal controls the generating circuit from reference voltage；
Wherein, in a power-on operation, which terminate the output so that the switch is connected
Ground, then the charge pump circuit exports the bias voltage with enable for the enable second control signal, the enable third controls again later
Signal is to start generating circuit from reference voltage enable output-stage circuit in turn；It is arrived until the output-stage circuit normally operates
After generating stable output voltage, which switchs to forbidden energy and disconnects the switch.
2. audio output system as described in claim 1, which is characterized in that the Dc bias level system of the output end connects for one
Ground voltage level.
3. audio output system as described in claim 1, which is characterized in that the bias voltage that the charge pump circuit exports
System is a negative voltage bias.
4. audio output system as claimed in claim 3, which is characterized in that it is inclined that the output-stage circuit system is biased in the negative voltage
Pressure and a positive voltage bias, which is reached by an operational amplifier.
5. audio output system as described in claim 1, which is characterized in that further include a capacitor, be to be produced with the reference voltage
Raw circuit coupling, in the power-on operation, the variation system of the reference voltage is related to the capacitance size of the capacitor.
6. audio output system as described in claim 1, which is characterized in that also include:
One input stage circuit, according to the reference voltage and a source of sound input signal to generate first signal.
7. audio output system as claimed in claim 6, which is characterized in that the input stage circuit is biased in a positive voltage level
With a ground voltage level.
8. audio output system as claimed in claim 6, which is characterized in that the output-stage circuit is biased in a positive voltage level
With the bias voltage, which is a negative voltage bias, and wherein a direct current of an output end of the output-stage circuit is inclined
Pressure level system is a ground voltage level.
9. audio output system as described in claim 1, wherein the first control signal maintains enable in the power-on operation
Switch to forbidden energy after one time section, and the second control signal continues to tie up with third control signal system after the time section
It is held in enabled status.
10. audio output system as claimed in claim 9, which is characterized in that in a power-off operation, which is first caused
The energy first control signal is grounded the output end so that the switch is connected, then forbidden energy third control signal is with the forbidden energy reference
Voltage generation circuit, and then the forbidden energy output-stage circuit, later again the forbidden energy second control signal with the forbidden energy charge pump circuit.
11. a kind of method for the audio output system for controlling claim 1, which is characterized in that the control method includes:
In a power-on operation, in a first time point, the switch is led with enable for the control circuit enable first control signal
It is logical, it is grounded the output end；
In one second time point, the charge pump circuit exports the bias plasma with enable for the control circuit enable second control signal
Pressure；And
In a third time point, which controls signal enable to start the generating circuit from reference voltage
The output-stage circuit；
Wherein the first time point is earlier than second time point, and second time point is earlier than the third time point.
12. control method as claimed in claim 11, which is characterized in that the Dc bias of the output end of the output-stage circuit
Level system is a ground voltage level.
13. control method as claimed in claim 11, which is characterized in that the bias voltage system of the charge pump circuit output is
One negative voltage bias.
14. control method as claimed in claim 13, which is characterized in that the output-stage circuit system is biased in the negative voltage bias
With a positive voltage bias, which is reached by an operational amplifier.
15. control method as claimed in claim 11, which is characterized in that the audio output system further includes a capacitor, be with
Generating circuit from reference voltage coupling, in the power-on operation, the capacitance size of the variation system and the capacitor of the reference voltage
It is related.
16. control method as claimed in claim 11, which is characterized in that the audio output system further includes input stage electricity
Road, according to the reference voltage and a source of sound input signal to generate first signal.
17. control method as claimed in claim 16, which is characterized in that the input stage circuit input stage circuit is biased in one
Positive voltage level and a ground voltage level.
18. control method as claimed in claim 16, which is characterized in that the output-stage circuit be biased in a positive voltage level with
The bias voltage, the bias voltage system are a negative voltage bias, wherein a Dc bias of an output end of the output-stage circuit
Level system is a ground voltage level.
19. control method as claimed in claim 11, which is characterized in that in the power-on operation, first control signal dimension
Switch to forbidden energy after holding one time section of enable, and the second control signal and the third control signal system after the time section
It continues in enabled status.
20. control method as claimed in claim 19, which is characterized in that also include:
In a power-off operation, at tetra- time point of Yu Yi, the switch is led with enable for the control circuit enable first control signal
It is logical, it is grounded the output end；
Five time point of Yu Yi, the control circuit forbidden energy third control signal with the forbidden energy generating circuit from reference voltage, in turn
The forbidden energy output-stage circuit；
At six time point of Yu Yi, the control circuit forbidden energy second control signal is with the forbidden energy charge pump circuit；
Wherein the third time point, the 4th time point was earlier than the 5th time point, the 5th time earlier than the 4th time point
Point is earlier than the 6th time point.
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| CN201510573325.3A CN106535037B (en) | 2015-09-10 | 2015-09-10 | Audio output system and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510573325.3A CN106535037B (en) | 2015-09-10 | 2015-09-10 | Audio output system and its control method |
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| CN106535037B true CN106535037B (en) | 2019-06-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101400009A (en) * | 2007-09-27 | 2009-04-01 | 美商富迪科技股份有限公司 | Microphone circuit |
| CN102761803A (en) * | 2012-06-14 | 2012-10-31 | 天地融科技股份有限公司 | Voice frequency interface self-adaptive device |
| CN104467704A (en) * | 2013-11-25 | 2015-03-25 | 松翰科技股份有限公司 | Audio amplifier, electronic device using same and transient noise suppression method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8325940B2 (en) * | 2008-12-19 | 2012-12-04 | Conexant Systems, Inc. | Power management controller for drivers |
| KR102005965B1 (en) * | 2012-06-18 | 2019-07-31 | 페어차일드 세미컨덕터 코포레이션 | Noise-canceling headphones with depletion-mode switch |
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2015
- 2015-09-10 CN CN201510573325.3A patent/CN106535037B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101400009A (en) * | 2007-09-27 | 2009-04-01 | 美商富迪科技股份有限公司 | Microphone circuit |
| CN102761803A (en) * | 2012-06-14 | 2012-10-31 | 天地融科技股份有限公司 | Voice frequency interface self-adaptive device |
| CN104467704A (en) * | 2013-11-25 | 2015-03-25 | 松翰科技股份有限公司 | Audio amplifier, electronic device using same and transient noise suppression method |
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