CN104506986B - Eliminate circuit, method and the active noise reduction earphone of active noise reduction earphone plosion - Google Patents
Eliminate circuit, method and the active noise reduction earphone of active noise reduction earphone plosion Download PDFInfo
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- CN104506986B CN104506986B CN201410691333.3A CN201410691333A CN104506986B CN 104506986 B CN104506986 B CN 104506986B CN 201410691333 A CN201410691333 A CN 201410691333A CN 104506986 B CN104506986 B CN 104506986B
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Abstract
The invention discloses a kind of circuit, method and active noise reduction earphone for eliminating active noise reduction earphone plosion, the circuit includes：Charge-discharge circuit, power-up time delay circuit and power-off delay circuit；Charge-discharge circuit, in system electrification, loudspeaker exports audio signal to be controlled through the first predetermined delay time；Or the state of exports audio signal is returned to through the 3rd predetermined delay time control loudspeaker in system cut-off；Power-up time delay circuit, the active noise reduction chip for controlling active noise reduction earphone after the second predetermined delay time in system electrification completes electricity；Power-off delay circuit, for controlling the volume adjusting chip of active noise reduction earphone to complete to power off through the 4th predetermined delay time in system cut-off.This circuit of the present invention can effectively eliminate plosive sound caused by active noise reduction headset switch machine and volume adjusting by the Sequential Circuit Design of pure hardware, and be easily achieved, cost it is low.
Description
Technical field
The present invention relates to active noise reduction earphone field, and in particular to a kind of circuit of elimination active noise reduction earphone plosion,
Method and active noise reduction earphone.
Background technology
Active noise reduction earphone is in earphone line control or earphone, to add noise reduction process chip, pass through noise reduction process chip
The reverse sound wave equal with ambient noise is produced, so as to neutralize, offset ambient noise to reach the effect of active noise reduction.Due to ear
Audio parts in machine are various to operate the transient impact brought to produce necessarily after upper electricity, shutdown transient and upper electricity stabilization
Explosion sound (i.e. POP sounds), the generations of POP sounds is due to be produced on active noise reduction earphone in electric, lower electricity or voltage change process
, so being related with the upper electric or lower electric sequential of chip in earphone.The circuit structure of existing active noise reduction earphone
In, when upper electricity or power-off, the volume adjusting chip and active noise reduction chip and exports audio signal of earphone are simultaneously upper electric or disconnected
Electricity, thus the noises such as POP sounds can be produced, it have impact on the tonequality of earphone.At present, main flow active noise reduction earphone carry out switching on and shutting down and
Certain POP sounds can be all produced during volume adjusting.For example, Bose In-Ear noise-eliminating earphone model Quiet Comfort 20 are surveyed
Runin also has certain when having obvious POP sounds, the AM180 active noise reductions earphone test switching on and shutting down of Huawei and volume adjusting when shutting down
POP sounds.The final purpose of active noise reduction earphone is to eliminate itself and the extraneous noise produced, make user hear it is most natural and
Perfect sound.It is therefore desirable to provide a kind of elimination active noise reduction headset switch machine and volume adjusting to cause the scheme of POP sounds,
Lift the tonequality of active noise reduction earphone.
The content of the invention
The invention provides a kind of circuit, method and active noise reduction earphone for eliminating active noise reduction earphone plosion, utilize
The circuit of this elimination active noise reduction earphone plosion of the present invention, method can eliminate active noise reduction headset switch machine and volume
Regulation causes POP sounds, lifts the tonequality of active noise reduction earphone.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
According to an aspect of the invention, there is provided a kind of circuit for eliminating active noise reduction earphone plosion, the circuit bag
Include：Charge-discharge circuit, power-up time delay circuit and power-off delay circuit；
One end of charge-discharge circuit is connected by the system switching of active noise reduction earphone with power supply；The other end and active noise reduction
The loudspeaker connection of earphone；
One end of power-up time delay circuit is connected by the system switching of active noise reduction earphone with power supply, and the other end is with actively dropping
Make an uproar earphone active noise reduction chip connection；
One end of power-off delay circuit is connected by the system switching of active noise reduction earphone with power supply, and the other end is with actively dropping
Make an uproar earphone volume adjusting chip connection；
Charge-discharge circuit, in system electrification, control loudspeaker to pass through the first predetermined delay time exports audio signal；
Or, in system cut-off, control loudspeaker return to the state of exports audio signal by the 3rd predetermined delay time；
Power-up time delay circuit, in system electrification, the active noise reduction chip of control active noise reduction earphone to pass through second
Predetermined delay time completes upper electricity；
Power-off delay circuit, in system cut-off, the volume adjusting chip of control active noise reduction earphone to pass through the 4th
Predetermined delay time completes power-off.
Alternatively, charge-discharge circuit includes：Charging circuit and discharge circuit, charging circuit include the first diode, second
Electric capacity, 3rd resistor, the first triode, discharge circuit include second resistance, the second diode, the first triode, the second electric capacity,
4th resistance, the second FET and first resistor；
Power-up time delay circuit includes：4th diode, the 6th resistance and the 4th electric capacity；
Power-off delay circuit includes：3rd diode, the 5th resistance and the 3rd electric capacity；
System switching of the positive pole of first diode through active noise reduction earphone is connected with power supply；
The negative pole of first diode is connected with one end of second resistance and the emitter stage of the first triode respectively；
The other end of second resistance is connected with one end of the first electric capacity, the other end ground connection of the first electric capacity；
The base stage of first triode and one end of 3rd resistor are connected；
The colelctor electrode of first triode is connected with one end of the 4th resistance and the grid of the second FET respectively；
The other end of 3rd resistor is connected with the positive pole of the second diode and one end of the second electric capacity respectively；
The other end ground connection of second electric capacity；
The negative pole of second diode is connected with the positive pole of the first diode；
The other end of 4th resistance is connected with the source electrode of the second FET and the other end of the second electric capacity respectively；
The drain electrode of second FET is connected through first resistor with the positive pole of the loudspeaker of active noise reduction earphone；
The negative pole ground connection of the loudspeaker of active noise reduction earphone；
The positive pole of 3rd diode is connected with the positive pole of the first diode；
The negative pole of 3rd diode respectively with one end, one end of the 3rd electric capacity and active noise reduction earphone of the 5th resistance
Volume adjusting chip is connected；
The other end of 3rd electric capacity is connected and is grounded with the other end of the 5th resistance；
The negative pole of 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode；
The positive pole of 4th diode respectively with the other end of the 6th resistance, one end of the 4th electric capacity and active noise reduction earphone
Active noise reduction chip connection；
The other end ground connection of 4th electric capacity.
Alternatively, the first scheduled delay is determined by 3rd resistor, the second electric capacity and supply voltage；Second predetermined delay
Time is determined by the 6th resistance, the 4th electric capacity；3rd scheduled delay is true by second resistance, the first electric capacity and supply voltage
It is fixed；4th scheduled delay is determined by the value of the 5th resistance and the 3rd electric capacity.
Alternatively, the second predetermined delay time is less than the first predetermined delay time, and the second predetermined delay time is more than 0
Second, the first predetermined delay time is less than 0.7 second；
4th predetermined delay time is less than the 3rd predetermined delay time, and the 4th predetermined delay time is more than 0 second, and the 3rd is pre-
Delay time is determined less than 0.7 second.
Alternatively, the first triode is PNP triode；Second FET is NMOS tube.
According to another aspect of the present invention there is provided a kind of active noise reduction earphone, active noise reduction earphone includes：The present invention
The circuit of the elimination active noise reduction earphone plosion of one side.
There is provided a kind of method for eliminating active noise reduction earphone plosion, this method according to a further aspect of the invention
Including：
Charge-discharge circuit is set between the power supply and loudspeaker of active noise reduction earphone；
Power-up time delay circuit is set between the power supply and active noise reduction chip of active noise reduction earphone；
Power-off delay circuit is set between the power supply and volume adjusting chip of active noise reduction earphone；
Using charge-discharge circuit, in system electrification, control loudspeaker pass through the first predetermined delay time exports audio signal；
Or, in system cut-off, control loudspeaker return to the state of exports audio signal by the 3rd predetermined delay time；
Using power-up time delay circuit, in system electrification, the active noise reduction chip of control active noise reduction earphone passes through second
Predetermined delay time completes upper electricity；
Using power-off delay circuit, in system cut-off, the volume adjusting chip of control active noise reduction earphone passes through the 4th
Predetermined delay time completes power-off.
Alternatively, charge-discharge circuit includes：Charging circuit and discharge circuit, charging circuit include the first diode, second
Electric capacity, 3rd resistor, the first triode, discharge circuit include second resistance, the second diode, the first triode, the first electric capacity,
4th resistance, the second FET and first resistor；Power-up time delay circuit includes：4th diode, the 6th resistance and the 4th electricity
Hold；
Power-off delay circuit includes：3rd diode, the 5th resistance and the 3rd electric capacity；
System switching of the positive pole of first diode through active noise reduction earphone is connected with power supply；
The negative pole of first diode is connected with one end of second resistance and the emitter stage of the first triode respectively；
The other end of second resistance is connected with one end of the first electric capacity, the other end ground connection of the first electric capacity；
The base stage of first triode and one end of 3rd resistor are connected；
The colelctor electrode of first triode is connected with one end of the 4th resistance and the grid of the second FET respectively；
The other end of 3rd resistor is connected with the positive pole of the second diode and one end of the second electric capacity respectively；
The other end ground connection of second electric capacity；
The negative pole of second diode is connected with the positive pole of the first diode；
The other end of 4th resistance is connected with the source electrode of the second FET and the other end of the second electric capacity respectively；
The drain electrode of second FET is connected through first resistor with the positive pole of the loudspeaker of active noise reduction earphone；
The negative pole ground connection of the loudspeaker of active noise reduction earphone；
The positive pole of 3rd diode is connected with the positive pole of the first diode；
The negative pole of 3rd diode respectively with one end, one end of the 3rd electric capacity and active noise reduction earphone of the 5th resistance
Volume adjusting chip is connected；
The other end of 3rd electric capacity is connected and is grounded with the other end of the 5th resistance；
The negative pole of 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode；
The positive pole of 4th diode respectively with the other end of the 6th resistance, one end of the 4th electric capacity and active noise reduction earphone
Active noise reduction chip connection；
The other end ground connection of 4th electric capacity.
Alternatively, the second predetermined delay time is less than the first predetermined delay time, and the second predetermined delay time is more than 0
Second, the first predetermined delay time is less than 0.7 second；
4th predetermined delay time is less than the 3rd predetermined delay time, and the 4th predetermined delay time is more than 0 second, and the 3rd is pre-
Delay time is determined less than 0.7 second.
Alternatively, the first triode is PNP triode；Second FET is NMOS tube.
The circuit of this elimination active noise reduction earphone plosion of the present invention, passes through the noise to producing POP sounds in earphone
Source is delayed the different scheduled times, and active noise reduction earphone POP sounds are effectively eliminated using level sequential, improves active noise reduction earphone
Tonequality.In addition, the circuit structure is simple, be easily achieved and with low cost.
Brief description of the drawings
Fig. 1 is a kind of structural frames of the circuit for elimination active noise reduction earphone plosion that one embodiment of the invention is provided
Figure；
Fig. 2 is a kind of circuit diagram of the circuit for elimination active noise reduction earphone plosion that one embodiment of the invention is provided；
Fig. 3 is that one kind that one embodiment of the invention is provided eliminates active noise reduction head circuit in system electrification, actively
The voltage change waveform diagram of noise cancelling headphone；
Fig. 4 is that one kind that one embodiment of the invention is provided eliminates active noise reduction head circuit in system cut-off, actively
The voltage change waveform diagram of noise cancelling headphone.
Embodiment
The present invention core concept be：For active noise reduction earphone explosion is produced in upper electricity, power-off and volume adjusting
The problem of sound, by designing hardware time order circuit, control noise source delay different time is started power up or powered off, so as to avoid
Upper electricity or power-off user can simultaneously for active noise reduction chip, volume adjusting chip and the exports audio signal of active noise reduction earphone
Hear that the phenomenon of the plosive occurs.
The invention provides a kind of circuit for eliminating active noise reduction earphone plosion, Fig. 1 is that one embodiment of the invention is carried
A kind of structured flowchart of the circuit of the elimination active noise reduction earphone plosion supplied, referring to Fig. 1, the circuit 100 includes：Discharge and recharge electricity
Road 110, power-up time delay circuit 130 and power-off delay circuit 120；
One end of charge-discharge circuit 110 is connected by the system switching of active noise reduction earphone with power supply；The other end and active
The loudspeaker connection of noise cancelling headphone；
One end of power-up time delay circuit 130 is connected by the system switching of active noise reduction earphone with power supply, the other end and master
The active noise reduction chip connection of dynamic noise cancelling headphone；
One end of power-off delay circuit 120 is connected by the system switching of active noise reduction earphone with power supply, the other end and master
The volume adjusting chip connection of dynamic noise cancelling headphone；
Charge-discharge circuit 110, in system electrification, control loudspeaker to be by the first predetermined delay time T1 outputs audio
Signal；Or, in system cut-off, control loudspeaker return to the shape of exports audio signal by the 3rd predetermined delay time T3
State；
Power-up time delay circuit 130, in system electrification, the active noise reduction chip of control active noise reduction earphone passes through the
It is electric in two predetermined delay time T2 completions；
Power-off delay circuit 120, in system cut-off, the volume adjusting chip of control active noise reduction earphone passes through the
Four predetermined delay time T4 complete power-off.
The circuit 100 of the elimination active noise reduction earphone plosion by charge-discharge circuit 110 in system electrification through first
Predetermined delay time T1 controls the loudspeaker exports audio signal of earphone, while by power-up time delay circuit 130, controlling active noise reduction
Chip is by electricity in the second predetermined delay time T2 completions, so in system electrification, in the active noise reduction chip delay of earphone
Electricity and volume adjusting the chip plosive that upper electricity is produced immediately can pass through earphone before the loudspeaker exports audio signal of earphone
Trumpet end output noise reduction, the loudspeaker of earphone exports audio signal again after the completion of noise reduction, such user, will not when using earphone
The plosive produced during system electrification is experienced, the usage experience of user can be lifted.
During system cut-off, charge-discharge circuit and the course of work of delay circuit be with it is upper electric when the course of work it is corresponding
, i.e., in system cut-off, the active noise reduction chip of earphone is powered off immediately, and the loudspeaker of earphone are controlled by charge-discharge circuit 110
Stop exports audio signal (loudspeaker ground connection)；Meanwhile, the volume adjusting chip of earphone is controlled through the by power-off delay circuit 120
Power-off is completed after four predetermined delay time T4, after the completion of noise reduction, the loudspeaker of earphone, which are then returned to, is capable of exports audio signal
State (voltage of loudspeaker returns to high level), such user is when using earphone, due to volume when will not also experience power-off
Adjust chip and active noise reduction chip and power off caused plosive simultaneously with exports audio signal, so as to improve active noise reduction ear
The tonequality of machine.
Fig. 2 is a kind of circuit diagram of the circuit for elimination active noise reduction earphone plosion that one embodiment of the invention is provided,
Referring to Fig. 2, the circuit includes：Charge-discharge circuit, power-up time delay circuit and power-off delay circuit；
Charge-discharge circuit includes：Charging circuit and discharge circuit, charging circuit include the first diode D1, the second electric capacity
C2,3rd resistor R3, the first triode Q1, discharge circuit include second resistance R2, the second diode D2, the first triode Q1,
First electric capacity C1, the 4th resistance R4, the second FET Q2 and first resistor R1；
Power-up time delay circuit includes：4th diode D4, the 6th resistance R6 and the 4th electric capacity C4；
Power-off delay circuit includes：3rd diode D3, the 5th resistance R5 and the 3rd electric capacity C3；First diode D1 is just
System switching of the pole through active noise reduction earphone is connected with power supply；
First diode D1 negative pole is connected with second resistance R2 one end and the first triode Q1 emitter stage respectively；
The second resistance R2 other end is connected with the first electric capacity C1 one end, the first electric capacity C1 other end ground connection；
First triode Q1 base stage is connected with 3rd resistor R3 one end；First triode Q1 colelctor electrode is respectively with
Four resistance R4 one end and the second FET Q2 grid connection；The 3rd resistor R3 other end respectively with the second diode
D2 positive pole and the second electric capacity C2 one end connection；
Second electric capacity C2 other end ground connection；Second diode D2 negative pole is connected with the first diode D1 positive pole；The
The four resistance R4 other end is connected with the second FET Q2 source electrode and the second electric capacity C2 other end respectively；Second effect
Should pipe Q2 drain electrode be connected through first resistor R1 with the positive pole of the loudspeaker of active noise reduction earphone；The loudspeaker of active noise reduction earphone it is negative
Pole is grounded；
3rd diode D3 positive pole is connected with the first diode D1 positive pole；3rd diode D3 negative pole is respectively with
The volume adjusting chip connection of five resistance R5 one end and the 3rd electric capacity C3 one end and active noise reduction earphone；
The 3rd electric capacity C3 other end is connected and is grounded with the 5th resistance R5 other end；4th diode D4 negative pole with
6th resistance R6 one end and the first diode D1 positive pole connection；
4th diode D4 positive pole drops with the 6th resistance R6 other end, the 4th electric capacity C4 one end and active respectively
Make an uproar earphone active noise reduction chip connection；4th electric capacity C4 other end ground connection.
In fig. 2, S1 represents the power supply that the system switching of active noise reduction earphone, V1 represent active noise reduction earphone, and V2 is represented
The audio signal of simulation, the loudspeaker of correspondence active noise reduction earphone.First triode is PNP triode, and the second FET Q2 is
NMOS tube.
For the effect of the circuit structure of this elimination active noise reduction earphone plosion of verifying the embodiment of the present invention, to this
Circuit is emulated.In fig. 2, the terminal of oscillograph is connected to the terminal company of the output end of earphone, system switching and power supply
It is connected to the input of earphone.DC1 represents the voltage signal of volume adjusting chip, accesses the input port of oscillograph, and DC2 represents master
The voltage signal of dynamic noise reduction chip, accesses another input port of oscillograph, and oscillograph has earth terminal.In active noise reduction earphone work
When making, the bottom of volume adjusting chip make an uproar (overall noise in addition to useful signal) made an uproar more than the bottom of active noise reduction chip.
Fig. 2 be in order to this circuit to the present invention is emulated and by DC1, DC2 and AUDIO end of circuit and oscillograph
In connection, actual head circuit structure, DC1 accesses the volume adjusting chip of active noise reduction earphone, and DC2 accesses the active of earphone
Noise reduction chip.
The course of work of the circuit in system electrification be：When electric on the upward closed-systems of system switching S1, volume adjusting
Chip is upper electric (i.e. POP sounds noise is exported immediately) immediately, and power supply V1 passes through by the first diode D1, the first triode Q1, the 3rd
The charging circuit that resistance R3, the second electric capacity C2 are constituted makes the second FET Q2 conducting and V2 signal grounds rapidly, then passes through
First predetermined delay time T1, the first triode Q1 end so that the second FET Q2 ends and V2 signals recover normal (defeated
Go out audio signal)；The power-up time delay circuit that power supply V1 is made up of the 4th diode D4, the 6th resistance R6, the 4th electric capacity C4, warp
The second predetermined delay time T2 is crossed, the voltage DC2 of active noise reduction chip is reached the supply voltage that active noise reduction chip allows.
Fig. 3 is that one kind that one embodiment of the invention is provided eliminates active noise reduction head circuit in system electrification, actively
The voltage change waveform diagram of noise cancelling headphone；Referring to Fig. 3,
In figure 3, the voltage of the trumpet end of gray shade waveforms stands active noise reduction earphone changes with time process, i.e.,
The voltage change process at earphone horn end is：In system electrification, the second FET Q2 causes V2 signal grounds, passes through
First predetermined delay time T1, the voltage of trumpet end returns to the state of exports audio signal, and voltage signal is high level.Lines
The voltage signal DC2 of waveforms stands active noise reduction chip change with time process, in system electrification, DC2 voltage letter
Electricity on completing number in the second scheduled time T2.
In the present embodiment, 0<T2<T1<0.7S, wherein, T1=R3*C2*Ln (V1/0.7), T2=m*R6*C4, m is 0
Coefficient between~1.The bottom of volume adjusting chip can be so set to make an uproar by the upper electricity of active noise reduction chip delay and earphone horn
Ground connection carries out secondary noise reduction, while the bottom of active noise reduction chip is made an uproar carries out a noise reduction by loudspeaker ground connection, and also it is pre- by first
Determining delay time and the second predetermined delay time control can make the sense of hearing natural in the range of 0.7S.
In the present embodiment, V1=3.6V, R3=100K, C2=3.3uF, m=0.7, R6=50K, C4=10uF are set,
Calculating obtains T1=R3*C2*Ln (V1/0.7)=0.54；T2=m*R6*C4=0.35.The first predetermined delay time T1 is set
It is set to 0.54 second, the second predetermined delay time T2 is set to 0.35 second, so by setting different delay times, effectively disappeared
During except system electrification, cause the noise source of POP sounds with audio signal while upper electricity is so as to cause user to hear the POP
Sound, the problem of reducing earphone tonequality.And will not be to user experience in the range of time T1 and T2 is arranged on 0.7 second
Impact.
In other embodiments of the present invention, the first predetermined predetermined delay time T2 of delay time T1 and second value can root
It is configured according to practical application, as long as POP sounds when line delay eliminates electricity on active noise reduction earphone can be entered in time by meeting,
User's sense of hearing nature is ensure that when using earphone simultaneously.
The course of work of the circuit in system cut-off be：The downward closed-system power-off of system switching S1, now, actively drops
Chip of making an uproar is powered off immediately；Electric charge on first electric capacity C1 passes through second resistance R2, the first triode Q1,3rd resistor R3, second
Diode D2 discharge circuit is discharged, and makes the second FET Q2 conducting and V2 signal grounds rapidly, then the elapsed time
3rd predetermined delay time T3, discharge voltage is less than the first triode Q1 conducting voltage and ended, and makes the second FET Q2
Cut-off and V2 signals recover that normal (voltage signal for returning to the state of exports audio signal, i.e. trumpet end returns to high electricity
It is flat)；Electric charge on 3rd electric capacity C3 is discharged by the 5th resistance R5, by the 4th predetermined delay time T4, volume adjusting chip
Voltage DC1 be less than volume adjusting chip allow supply voltage, volume adjusting chip complete power-off.
Fig. 4 is that one kind that one embodiment of the invention is provided eliminates active noise reduction head circuit in system cut-off, actively
The voltage change waveform diagram of noise cancelling headphone, referring to Fig. 4, when gray shade waveforms stands are powered off, active noise reduction earphone horn
The waveform signal that the voltage at end is changed over time, the voltage of volume adjusting chip is changed over time during the waveforms stands power-off of lines
Waveform signal.Referring to Fig. 4, in the present embodiment, 0<T4<T3<0.7S, wherein T3=R2*C1*Ln (V1/1.4), T2=n*
R5*C3, n are the coefficient between 0~1.The bottom of volume adjusting chip can be so set to make an uproar by volume adjusting chip delay cut-off
Secondary noise reduction is carried out with earphone horn audio ground connection, while the bottom of active noise reduction chip is made an uproar carries out one by loudspeaker audio ground connection
Secondary noise reduction, and the sense of hearing can be made natural in the range of 0.7S the third and fourth predetermined delay time control.In the present embodiment
In, V1=3.6V, R2=50K, C1=10uF, n=0.3, R5=100K, C3=10uF are set.Calculating obtains T3=R2*C1*
Ln (V1/1.4)=0.47, T2=n*R5*C3=0.30.The 4th predetermined delay time T4 is set to 0.3 second, it is pre- by the 3rd
Determine delay time T3 to be set to 0.47 second, so by setting different delay times, when effectively eliminating system cut-off, cause
The noise source of POP sounds is powered off simultaneously with audio signal causes user to hear the POP sounds, the problem of reducing earphone tonequality.
And user experience will not be impacted in the range of time T4 and T3 is arranged on 0.7 second.
In other embodiments of the invention, the 4th predetermined predetermined delay time T3 of delay time T4 and the 3rd can be it
His numerical value, as long as the plosive when delay time set can effectively eliminate the power-off of active noise reduction earphone does not influence user again
Use.
To sum up, the circuit for this elimination active noise reduction earphone plosion that the present invention is provided, by producing POP in earphone
The noise source of sound is delayed the different scheduled times, and active noise reduction earphone POP sounds are effectively eliminated using level sequential, is improved and is actively dropped
Make an uproar the tonequality of earphone.In addition, the circuit structure is simple, be easily achieved and with low cost.
Present invention also offers a kind of method except active noise reduction earphone plosion, this method includes：
Charge-discharge circuit is set between the power supply and loudspeaker of active noise reduction earphone；Power supply and master in active noise reduction earphone
Power-up time delay circuit is set between dynamic noise reduction chip；Power-off is set between the power supply and volume adjusting chip of active noise reduction earphone
Delay circuit；Using charge-discharge circuit, in system electrification, control loudspeaker are by the first predetermined delay time output audio letter
Number；Or, in system cut-off, control loudspeaker return to the state of exports audio signal by the 3rd predetermined delay time；Profit
Have access to electricity delay circuit, in system electrification, when the active noise reduction chip of control active noise reduction earphone is by the second predetermined delay
Between complete upper electricity；Using power-off delay circuit, in system cut-off, the volume adjusting chip of control active noise reduction earphone passes through the
Four predetermined delay times complete power-off.
In the present embodiment, charge-discharge circuit includes：Charging circuit and discharge circuit, charging circuit include the one or two pole
Pipe, the second electric capacity, 3rd resistor, the first triode, discharge circuit include the first electric capacity, second resistance, the second diode, first
Triode, the 4th resistance, the second FET and first resistor；Power-up time delay circuit includes：4th diode, the 6th resistance and
4th electric capacity；Power-off delay circuit includes：3rd diode, the 5th resistance and the 3rd electric capacity；The positive pole of first diode is through master
The system switching of dynamic noise cancelling headphone is connected with power supply；
The negative pole of first diode is connected with one end of second resistance and the emitter stage of the first triode respectively；Second electricity
The other end of resistance is connected with one end of the first electric capacity, the other end ground connection of the first electric capacity；The base stage of first triode and the 3rd electricity
One end connection of resistance；
The colelctor electrode of first triode is connected with one end of the 4th resistance and the grid of the second FET respectively；3rd
The other end of resistance is connected with the positive pole of the second diode and one end of the second electric capacity respectively；Another termination of second electric capacity
Ground；The negative pole of second diode is connected with the positive pole of the first diode；
The other end of 4th resistance is connected with the source electrode of the second FET and the other end of the second electric capacity respectively；Second
The drain electrode of FET is connected through first resistor with the positive pole of the loudspeaker of active noise reduction earphone；The loudspeaker of active noise reduction earphone it is negative
Pole is grounded；The positive pole of 3rd diode is connected with the positive pole of the first diode；The negative pole of 3rd diode respectively with the 5th resistance
One end, the volume adjusting chip connection of one end of the 3rd electric capacity and active noise reduction earphone；The other end of 3rd electric capacity and
The other end of five resistance is connected and is grounded；
The negative pole of 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode；4th diode
Positive pole is connected with the other end of the 6th resistance, one end of the 4th electric capacity and the active noise reduction chip of active noise reduction earphone respectively；
The other end ground connection of 4th electric capacity.
In the present embodiment, the second predetermined delay time is less than the first predetermined delay time, and the second predetermined delay time
More than 0 second, the first predetermined delay time was less than 0.7 second；4th predetermined delay time is less than the 3rd predetermined delay time, and the 4th
Predetermined delay time is more than 0 second, and the 3rd predetermined delay time is less than 0.7 second.
In the present embodiment, the first triode is PNP triode；Second FET is NMOS tube.
It should be noted that the present invention this elimination active noise reduction earphone plosion method, be with it is described above
The circuit structure for eliminating active noise reduction earphone plosion is corresponding, thus, the realization of the method for active noise reduction earphone plosion
Step may refer to the explanation of the course of work part of the circuit of foregoing active noise reduction earphone plosion, will not be repeated here.
Present invention also offers a kind of active noise reduction earphone, the active noise reduction earphone includes：Described in one aspect of the invention
Elimination active noise reduction earphone plosion circuit.This elimination of the active noise reduction earphone due to being integrated with the present invention is actively dropped
Make an uproar earphone plosion circuit thus when in use, user will not hear electricity, power-off and plosive during volume adjusting, have
More preferably tonequality and user experience.
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 substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. a kind of circuit for eliminating active noise reduction earphone plosion, it is characterised in that the circuit includes：Charge-discharge circuit, upper electricity
Delay circuit and power-off delay circuit；
One end of the charge-discharge circuit is connected by the system switching of the active noise reduction earphone with power supply；The other end with it is described
The loudspeaker connection of active noise reduction earphone；
One end of the power-up time delay circuit is connected by the system switching of the active noise reduction earphone with power supply, the other end and institute
State the active noise reduction chip connection of active noise reduction earphone；
One end of the power-off delay circuit is connected by the system switching of the active noise reduction earphone with power supply, the other end and institute
State the volume adjusting chip connection of active noise reduction earphone；
The charge-discharge circuit, in system electrification, controlling the loudspeaker by the first predetermined delay time output audio
Signal；Or, in system cut-off, control the loudspeaker to return to the shape of exports audio signal by the 3rd predetermined delay time
State；
The power-up time delay circuit, in system electrification, controlling the active noise reduction chip of the active noise reduction earphone to pass through
Second predetermined delay time completes upper electricity；
The power-off delay circuit, in system cut-off, controlling the volume adjusting chip of the active noise reduction earphone to pass through
4th predetermined delay time completes power-off；
The charge-discharge circuit includes：Charging circuit and discharge circuit, the charging circuit include the first diode, the second electricity
Appearance, 3rd resistor, the first triode, the discharge circuit include second resistance, the second diode, the first triode, the first electricity
Appearance, the 4th resistance, the second FET and first resistor；The power-up time delay circuit includes：4th diode, the 6th resistance and
4th electric capacity；
The power-off delay circuit includes：3rd diode, the 5th resistance and the 3rd electric capacity；
System switching of the positive pole of first diode through the active noise reduction earphone is connected with power supply；
The negative pole of first diode connects with one end of the second resistance and the emitter stage of first triode respectively
Connect；
The other end of the second resistance is connected with one end of first electric capacity, the other end ground connection of first electric capacity；
The base stage of first triode is connected with one end of the 3rd resistor；
The colelctor electrode of first triode one end respectively with the 4th resistance and the grid of second FET
Connection；
The other end of the 3rd resistor is connected with the positive pole of second diode and one end of second electric capacity respectively；
The other end ground connection of second electric capacity；
The negative pole of second diode is connected with the positive pole of first diode；
The source electrode and the other end of second electric capacity of the other end of 4th resistance respectively with second FET
Connection；
The drain electrode of second FET is connected through the first resistor with the positive pole of the loudspeaker of the active noise reduction earphone；
The negative pole ground connection of the loudspeaker of the active noise reduction earphone；
The positive pole of 3rd diode is connected with the positive pole of first diode；
The negative pole of 3rd diode drops with one end, one end of the 3rd electric capacity and the active of the 5th resistance respectively
Make an uproar earphone volume adjusting chip connection；
The other end of 3rd electric capacity is connected and is grounded with the other end of the 5th resistance；
The negative pole of 4th diode is connected with one end of the 6th resistance and the positive pole of first diode；
The other end, one end of the 4th electric capacity and the active of the positive pole of 4th diode respectively with the 6th resistance
The active noise reduction chip connection of noise cancelling headphone；
The other end ground connection of 4th electric capacity.
2. circuit as claimed in claim 1, it is characterised in that first scheduled delay is by 3rd resistor, the second electricity
Hold and supply voltage is determined；Second scheduled delay is determined by the 6th resistance, the 4th electric capacity；3rd predetermined delay
Time is determined by second resistance, the first electric capacity and supply voltage；4th scheduled delay is by the 5th resistance and the 3rd electricity
The value of appearance is determined.
3. the circuit as any one of claim 1-2, it is characterised in that the second predetermined delay time is less than described
First predetermined delay time, and the second predetermined delay time, more than 0 second, the first predetermined delay time is less than 0.7 second；
The 4th predetermined delay time is less than the 3rd predetermined delay time, and the 4th predetermined delay time is more than 0
Second, the 3rd predetermined delay time is less than 0.7 second.
4. circuit as claimed in claim 1, it is characterised in that first triode is PNP triode；
Second FET is NMOS tube.
5. a kind of active noise reduction earphone, it is characterised in that the active noise reduction earphone includes：Such as any one of claim 1-3
The circuit of described elimination active noise reduction earphone plosion.
6. a kind of method for eliminating active noise reduction earphone plosion, it is characterised in that this method includes：
Charge-discharge circuit is set between the power supply and loudspeaker of the active noise reduction earphone；
Power-up time delay circuit is set between the power supply and active noise reduction chip of the active noise reduction earphone；
Power-off delay circuit is set between the power supply and volume adjusting chip of the active noise reduction earphone；
Using the charge-discharge circuit, in system electrification, the loudspeaker are controlled by the first predetermined delay time output audio
Signal；Or, in system cut-off, control the loudspeaker to return to the shape of exports audio signal by the 3rd predetermined delay time
State；
Using the power-up time delay circuit, in system electrification, the active noise reduction chip of the active noise reduction earphone is controlled to pass through
Second predetermined delay time completes upper electricity；
Using the power-off delay circuit, in system cut-off, the volume adjusting chip of the active noise reduction earphone is controlled to pass through
4th predetermined delay time completes power-off；
The charge-discharge circuit includes：Charging circuit and discharge circuit, the charging circuit include the first diode, the second electricity
Appearance, 3rd resistor, discharge circuit described in the first triode include second resistance, the second diode, the first triode, the first electricity
Appearance, the 4th resistance, the second FET and first resistor；
The power-up time delay circuit includes：4th diode, the 6th resistance and the 4th electric capacity；
The power-off delay circuit includes：3rd diode, the 5th resistance and the 3rd electric capacity；
System switching of the positive pole of first diode through the active noise reduction earphone is connected with power supply；
The negative pole of first diode connects with one end of the second resistance and the emitter stage of first triode respectively
Connect；
The other end of the second resistance is connected with one end of first electric capacity, the other end ground connection of first electric capacity；
The base stage of first triode is connected with one end of the 3rd resistor；
The colelctor electrode of first triode one end respectively with the 4th resistance and the grid of second FET
Connection；
The other end of the 3rd resistor is connected with the positive pole of second diode and one end of second electric capacity respectively；
The other end ground connection of second electric capacity；
The negative pole of second diode is connected with the positive pole of first diode；
The source electrode and the other end of second electric capacity of the other end of 4th resistance respectively with second FET
Connection；
The drain electrode of second FET is connected through the first resistor with the positive pole of the loudspeaker of the active noise reduction earphone；
The negative pole ground connection of the loudspeaker of the active noise reduction earphone；
The positive pole of 3rd diode is connected with the positive pole of first diode；
The negative pole of 3rd diode drops with one end, one end of the 3rd electric capacity and the active of the 5th resistance respectively
Make an uproar earphone volume adjusting chip connection；
The other end of 3rd electric capacity is connected and is grounded with the other end of the 5th resistance；
The negative pole of 4th diode is connected with one end of the 6th resistance and the positive pole of first diode；
The other end, one end of the 4th electric capacity and the active of the positive pole of 4th diode respectively with the 6th resistance
The active noise reduction chip connection of noise cancelling headphone；
The other end ground connection of 4th electric capacity.
7. method as claimed in claim 6, it is characterised in that
The second predetermined delay time is less than the described first predetermined delay time, and the second predetermined delay time is more than 0
Second, the first predetermined delay time is less than 0.7 second；
The 4th predetermined delay time is less than the 3rd predetermined delay time, and the 4th predetermined delay time is more than 0
Second, the 3rd predetermined delay time is less than 0.7 second.
8. method as claimed in claim 6, it is characterised in that first triode is PNP triode；
Second FET is NMOS tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691333.3A CN104506986B (en) | 2014-11-25 | 2014-11-25 | Eliminate circuit, method and the active noise reduction earphone of active noise reduction earphone plosion |
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|---|---|---|---|
| CN201410691333.3A CN104506986B (en) | 2014-11-25 | 2014-11-25 | Eliminate circuit, method and the active noise reduction earphone of active noise reduction earphone plosion |
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| CN104506986A CN104506986A (en) | 2015-04-08 |
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| CN106936972B (en) * | 2015-12-30 | 2020-10-09 | 小米科技有限责任公司 | Method, device and system for controlling audio channel |
| CN108683979B (en) * | 2018-07-11 | 2020-11-17 | 深圳市东微智能科技股份有限公司 | Mute circuit and audio equipment |
| CN109040889B (en) * | 2018-07-27 | 2020-01-10 | 歌尔科技有限公司 | Feedback noise reduction earphone and feedback circuit thereof |
| CN109660903B (en) * | 2019-01-14 | 2020-06-30 | 安凯(广州)微电子技术有限公司 | Earphone pop sound elimination method, system and device |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102572642B (en) * | 2010-12-14 | 2014-12-10 | 联芯科技有限公司 | Audio POP sound elimination method and earphone audio circuit |
| CN103313168A (en) * | 2012-03-08 | 2013-09-18 | 鸿富锦精密工业（深圳）有限公司 | Headset jack drive circuit |
| CN202918465U (en) * | 2012-10-31 | 2013-05-01 | 北京航天长峰科技工业集团有限公司 | Multifunctional anti-popping earshield |
| CN203933898U (en) * | 2014-04-14 | 2014-11-05 | 深圳市冠旭电子有限公司 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
| CN204316702U (en) * | 2014-11-25 | 2015-05-06 | 青岛歌尔声学科技有限公司 | Eliminate circuit and the active noise reduction earphone of active noise reduction earphone plosion |
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