CN104506986A - Circuit and method for eliminating pop of active noise reduction earphone and active noise reduction earphone - Google Patents
Circuit and method for eliminating pop of active noise reduction earphone and active noise reduction earphone Download PDFInfo
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Abstract
The invention discloses a circuit and a method for eliminating the pop of an active noise reduction earphone and the active noise reduction earphone. The circuit includes a charging and discharging circuit, a power-on time-delay circuit and a power-off time-delay circuit; the charging and discharging circuit is used for controlling a loudspeaker to output audio signals after a first predetermined delay time when a system is powered on, or controlling the loudspeaker to recover to the state of outputting the audio signals after a third predetermined delay time when the system is powered off; the power-on time-delay circuit is used for controlling an active noise reduction chip of the active noise reduction earphone to be powered on after a second predetermined delay time when the system is powered on; and the power-off time-delay circuit is used for controlling an volume regulation chip of the active noise reduction earphone to be powered off after a fourth predetermined delay time when the system is powered off. The circuit for eliminating the pop of the active noise reduction earphone provided by the invention, through the design of a pure hardware sequential circuit, can eliminate the pop caused by turning on and turning off the active noise reduction earphone or regulating the volume of the same, and is easy to implement and low in cost.
Description
Technical field
The present invention relates to active noise reduction earphone field, be specifically related to a kind of circuit, method and the active noise reduction earphone of eliminating active noise reduction earphone plosion.
Background technology
Active noise reduction earphone is in earphone line control or earphone, adds noise reduction process chip, produces the reverse sound wave equal with ambient noise by noise reduction process chip, thus neutralization, counteracting ambient noise reach the effect of active noise reduction.Due to the audio parts in earphone powering on, shutdown transient and power on stable after, the transient impact that various operation brings can produce certain explosion sound (i.e. POP sound), the generation of POP sound powers on, produces in lower electricity or voltage change process due to active noise reduction earphone, thus with chip in earphone power on or the sequential of lower electricity is related.In the circuit structure of existing active noise reduction earphone, power on or power-off time, the volume adjusting chip of earphone and active noise reduction chip and output audio signal power on or power-off simultaneously, thus can produce the noises such as POP sound, have impact on the tonequality of earphone.At present, certain POP sound can all be produced when the active noise reduction earphone of main flow carries out switching on and shutting down and volume adjusting.Such as, have during the In-Ear noise-eliminating earphone model Quiet Comfort 20 Test Switchboard machine of Bose when obvious POP sound, the AM180 active noise reduction earphone Test Switchboard machine of Huawei and volume adjusting and also have certain POP sound.The final purpose of active noise reduction earphone to eliminate self and the extraneous noise produced, and makes user hear the most natural and perfect sound.Therefore be necessary to provide a kind of and eliminate the scheme that active noise reduction headset switch machine and volume adjusting cause POP sound, promote the tonequality of active noise reduction earphone.
Summary of the invention
The invention provides a kind of circuit, method and the active noise reduction earphone of 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 adjusting causes POP sound, promote the tonequality of active noise reduction earphone.
For achieving the above object, technical scheme of the present invention is achieved in that
According to an aspect of the present invention, provide a kind of circuit eliminating active noise reduction earphone plosion, this circuit comprises: charge-discharge circuit, power-up time delay circuit and power-off delay circuit;
One end of charge-discharge circuit is connected with power supply by the system switching of active noise reduction earphone; The other end is connected with the loudspeaker of active noise reduction earphone;
One end of power-up time delay circuit is connected with power supply by the system switching of active noise reduction earphone, and the other end is connected with the active noise reduction chip of active noise reduction earphone;
One end of power-off delay circuit is connected with power supply by the system switching of active noise reduction earphone, and the other end is connected with the volume adjusting chip of active noise reduction earphone;
Charge-discharge circuit, for when system electrification, controls loudspeaker through the first predetermined delay time output audio signal; Or, when system cut-off, control loudspeaker return to output audio signal state through the 3rd predetermined delay time;
Power-up time delay circuit, for when system electrification, the active noise reduction chip controlling active noise reduction earphone completes through the second predetermined delay time and powers on;
Power-off delay circuit, for when system cut-off, the volume adjusting chip controlling active noise reduction earphone completes power-off through the 4th predetermined delay time.
Alternatively, charge-discharge circuit comprises: charging circuit and discharge circuit, charging circuit comprises the first diode, the second electric capacity, the 3rd resistance, the first triode, and discharge circuit comprises the second resistance, the second diode, the first triode, the second electric capacity, the 4th resistance, the second field effect transistor and the first resistance;
Power-up time delay circuit comprises: the 4th diode, the 6th resistance and the 4th electric capacity;
Power-off delay circuit comprises: the 3rd diode, the 5th resistance and the 3rd electric capacity;
The positive pole of the first diode is connected with power supply through the system switching of active noise reduction earphone;
The negative pole of the first diode is connected with one end of the second resistance and the emitter of the first triode respectively;
The other end of the 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 the first triode is connected with one end of the 3rd resistance;
The collector electrode of the first triode is connected with one end of the 4th resistance and the grid of the second field effect transistor respectively;
The other end of the 3rd resistance 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 the second electric capacity;
The negative pole of the second diode is connected with the positive pole of the first diode;
The other end of the 4th resistance is connected with the source electrode of the second field effect transistor and the other end of the second electric capacity respectively;
The drain electrode of the second field effect transistor is connected through the positive pole of the first resistance with the loudspeaker of active noise reduction earphone;
The minus earth of the loudspeaker of active noise reduction earphone;
The positive pole of the 3rd diode is connected with the positive pole of the first diode;
The negative pole of the 3rd diode is connected with one end of the 5th resistance, one end of the 3rd electric capacity and the volume adjusting chip of active noise reduction earphone respectively;
The other end of the 3rd electric capacity is connected with the other end of the 5th resistance and ground connection;
The negative pole of the 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode;
The positive pole of the 4th diode 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 the 4th electric capacity.
Alternatively, the first scheduled delay is determined by the 3rd resistance, the second electric capacity and supply voltage; Second scheduled delay is determined by the 6th resistance, the 4th electric capacity; 3rd scheduled delay is determined by the second resistance, the first electric capacity and supply voltage; 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 greater than 0 second, and 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 greater than 0 second, and the 3rd predetermined delay time is less than 0.7 second.
Alternatively, the first triode is PNP triode; Second field effect transistor is NMOS tube.
According to another aspect of the present invention, provide a kind of active noise reduction earphone, active noise reduction earphone comprises: the circuit of the elimination active noise reduction earphone plosion of one aspect of the invention.
According to a further aspect of the invention, provide a kind of method eliminating active noise reduction earphone plosion, the method comprises:
Between the power supply and loudspeaker of active noise reduction earphone, charge-discharge circuit is set;
Between the power supply and active noise reduction chip of active noise reduction earphone, power-up time delay circuit is set;
Between the power supply and volume adjusting chip of active noise reduction earphone, power-off delay circuit is set;
Utilize charge-discharge circuit, when system electrification, control loudspeaker through the first predetermined delay time output audio signal; Or, when system cut-off, control loudspeaker return to output audio signal state through the 3rd predetermined delay time;
Utilize power-up time delay circuit, when system electrification, the active noise reduction chip controlling active noise reduction earphone completes through the second predetermined delay time and powers on;
Utilize power-off delay circuit, when system cut-off, the volume adjusting chip controlling active noise reduction earphone completes power-off through the 4th predetermined delay time.
Alternatively, charge-discharge circuit comprises: charging circuit and discharge circuit, charging circuit comprises the first diode, the second electric capacity, the 3rd resistance, the first triode, and discharge circuit comprises the second resistance, the second diode, the first triode, the first electric capacity, the 4th resistance, the second field effect transistor and the first resistance; Power-up time delay circuit comprises: the 4th diode, the 6th resistance and the 4th electric capacity;
Power-off delay circuit comprises: the 3rd diode, the 5th resistance and the 3rd electric capacity;
The positive pole of the first diode is connected with power supply through the system switching of active noise reduction earphone;
The negative pole of the first diode is connected with one end of the second resistance and the emitter of the first triode respectively;
The other end of the 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 the first triode is connected with one end of the 3rd resistance;
The collector electrode of the first triode is connected with one end of the 4th resistance and the grid of the second field effect transistor respectively;
The other end of the 3rd resistance 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 the second electric capacity;
The negative pole of the second diode is connected with the positive pole of the first diode;
The other end of the 4th resistance is connected with the source electrode of the second field effect transistor and the other end of the second electric capacity respectively;
The drain electrode of the second field effect transistor is connected through the positive pole of the first resistance with the loudspeaker of active noise reduction earphone;
The minus earth of the loudspeaker of active noise reduction earphone;
The positive pole of the 3rd diode is connected with the positive pole of the first diode;
The negative pole of the 3rd diode is connected with one end of the 5th resistance, one end of the 3rd electric capacity and the volume adjusting chip of active noise reduction earphone respectively;
The other end of the 3rd electric capacity is connected with the other end of the 5th resistance and ground connection;
The negative pole of the 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode;
The positive pole of the 4th diode 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 the 4th electric capacity.
Alternatively, the second predetermined delay time is less than the first predetermined delay time, and the second predetermined delay time is greater than 0 second, and 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 greater than 0 second, and the 3rd predetermined delay time is less than 0.7 second.
Alternatively, the first triode is PNP triode; Second field effect transistor is NMOS tube.
The circuit of this elimination active noise reduction earphone plosion of the present invention, by the scheduled time different to the noise source time delay producing POP sound in earphone, utilizes level sequential effectively to eliminate active noise reduction earphone POP sound, improves the tonequality of active noise reduction earphone.In addition, this circuit structure simple, be easy to realize and with low cost.
Accompanying drawing explanation
Fig. 1 is a kind of structured flowchart eliminating the circuit of active noise reduction earphone plosion that one embodiment of the invention provides;
Fig. 2 is a kind of circuit diagram eliminating the circuit of active noise reduction earphone plosion that one embodiment of the invention provides;
Fig. 3 is that the one that one embodiment of the invention provides eliminates active noise reduction head circuit when system electrification, the change in voltage waveform schematic diagram of active noise reduction earphone;
Fig. 4 is that the one that one embodiment of the invention provides eliminates active noise reduction head circuit when system cut-off, the change in voltage waveform schematic diagram of active noise reduction earphone.
Embodiment
Core concept of the present invention is: for active noise reduction earphone powering on, power-off and volume adjusting time produce plosive problem, by design hardware time order circuit, time delay different time in control noises source starts to power on or power-off, thus avoids active noise reduction chip, the volume adjusting chip of active noise reduction earphone and output audio signal powers on simultaneously or power-off user can hear that this plosive phenomenon occurs.
The invention provides a kind of circuit eliminating active noise reduction earphone plosion, Fig. 1 is a kind of structured flowchart eliminating the circuit of active noise reduction earphone plosion that one embodiment of the invention provides, see Fig. 1, this circuit 100 comprises: charge-discharge circuit 110, power-up time delay circuit 130 and power-off delay circuit 120;
One end of charge-discharge circuit 110 is connected with power supply by the system switching of active noise reduction earphone; The other end is connected with the loudspeaker of active noise reduction earphone;
One end of power-up time delay circuit 130 is connected with power supply by the system switching of active noise reduction earphone, and the other end is connected with the active noise reduction chip of active noise reduction earphone;
One end of power-off delay circuit 120 is connected with power supply by the system switching of active noise reduction earphone, and the other end is connected with the volume adjusting chip of active noise reduction earphone;
Charge-discharge circuit 110, for when system electrification, controls loudspeaker through the first predetermined delay time T1 output audio signal; Or, when system cut-off, control loudspeaker return to output audio signal state through the 3rd predetermined delay time T3;
Power-up time delay circuit 130, for when system electrification, the active noise reduction chip controlling active noise reduction earphone completes through the second predetermined delay time T2 and powers on;
Power-off delay circuit 120, for when system cut-off, the volume adjusting chip controlling active noise reduction earphone completes power-off through the 4th predetermined delay time T4.
The circuit 100 of this elimination active noise reduction earphone plosion controls the loudspeaker output audio signal of earphone through the first predetermined delay time T1 when system electrification by charge-discharge circuit 110, simultaneously by power-up time delay circuit 130, control active noise reduction chip completes through the second predetermined delay time T2 and powers on, like this when system electrification, the plosive that the active noise reduction chip time delay of earphone powers on and volume adjusting chip powers on immediately to be produced can export noise reduction by the trumpet end of earphone before the loudspeaker output audio signal of earphone, the loudspeaker of earphone output audio signal again after noise reduction completes, such user is when using earphone, the plosive produced when can not experience system electrification, the experience of user can be promoted.
During system cut-off, charge-discharge circuit and the course of work of delay circuit are corresponding with course of work when powering on, namely when system cut-off, the active noise reduction chip power-off immediately of earphone, the loudspeaker being controlled earphone by charge-discharge circuit 110 stop output audio signal (loudspeaker ground connection); Simultaneously, the volume adjusting chip being controlled earphone by power-off delay circuit 120 completes power-off after the 4th predetermined delay time T4, after noise reduction completes, the loudspeaker of earphone return to again can the state (voltage resume of loudspeaker is to high level) of output audio signal, such user is when using earphone, due to the plosive that volume adjusting chip and active noise reduction chip and output audio signal power-off simultaneously cause when also can not experience power-off, thus improve the tonequality of active noise reduction earphone.
Fig. 2 is a kind of circuit diagram eliminating the circuit of active noise reduction earphone plosion that one embodiment of the invention provides, and see Fig. 2, this circuit comprises: charge-discharge circuit, power-up time delay circuit and power-off delay circuit;
Charge-discharge circuit comprises: charging circuit and discharge circuit, charging circuit comprises the first diode D1, the second electric capacity C2, the 3rd resistance R3, the first triode Q1, and discharge circuit comprises the second resistance R2, the second diode D2, the first triode Q1, the first electric capacity C1, the 4th resistance R4, the second field effect transistor Q2 and the first resistance R1;
Power-up time delay circuit comprises: the 4th diode D4, the 6th resistance R6 and the 4th electric capacity C4;
Power-off delay circuit comprises: the 3rd diode D3, the 5th resistance R5 and the 3rd electric capacity C3; The positive pole of the first diode D1 is connected with power supply through the system switching of active noise reduction earphone;
The negative pole of the first diode D1 is connected with one end of the second resistance R2 and the emitter of the first triode Q1 respectively; The other end of the second resistance R2 is connected with one end of the first electric capacity C1, the other end ground connection of the first electric capacity C1;
The base stage of the first triode Q1 is connected with one end of the 3rd resistance R3; The collector electrode of the first triode Q1 is connected with one end of the 4th resistance R4 and the grid of the second field effect transistor Q2 respectively; The other end of the 3rd resistance R3 is connected with the positive pole of the second diode D2 and one end of the second electric capacity C2 respectively;
The other end ground connection of the second electric capacity C2; The negative pole of the second diode D2 is connected with the positive pole of the first diode D1; The other end of the 4th resistance R4 is connected with the source electrode of the second field effect transistor Q2 and the other end of the second electric capacity C2 respectively; The drain electrode of the second field effect transistor Q2 is connected with the positive pole of the loudspeaker of active noise reduction earphone through the first resistance R1; The minus earth of the loudspeaker of active noise reduction earphone;
The positive pole of the 3rd diode D3 is connected with the positive pole of the first diode D1; The negative pole of the 3rd diode D3 is connected with one end of the 5th resistance R5 and one end of the 3rd electric capacity C3 and the volume adjusting chip of active noise reduction earphone respectively;
The other end of the 3rd electric capacity C3 is connected with the other end of the 5th resistance R5 and ground connection; The negative pole of the 4th diode D4 is connected with the positive pole of one end of the 6th resistance R6 and the first diode D1;
The positive pole of the 4th diode D4 is connected with the other end of the 6th resistance R6, one end of the 4th electric capacity C4 and the active noise reduction chip of active noise reduction earphone respectively; The other end ground connection of the 4th electric capacity C4.
In fig. 2, the power supply that S1 represents the system switching of active noise reduction earphone, V1 represents active noise reduction earphone, the audio signal of V2 representative simulation, the loudspeaker of corresponding active noise reduction earphone.First triode is PNP triode, and the second field effect transistor Q2 is NMOS tube.
In order to verify the effect of the circuit structure of this elimination active noise reduction earphone plosion of the embodiment of the present invention, this circuit is emulated.In fig. 2, oscillographic connecting terminals receives the output of earphone, and the connecting terminals of system switching and power supply receives the input of earphone.DC1 represents the voltage signal of volume adjusting chip, accesses oscillographic input port, and DC2 represents the voltage signal of active noise reduction chip, and access another input port oscillographic, oscilloscope has earth terminal.When active noise reduction earphone works, make an uproar in the end that (overall noise except useful signal) be greater than active noise reduction chip of the making an uproar end of volume adjusting chip.
DC1, DC2 of circuit are connected with oscilloscope with AUDIO end to emulate this circuit of the present invention by Fig. 2, and in actual head circuit structure, DC1 accesses the volume adjusting chip of active noise reduction earphone, and DC2 accesses the active noise reduction chip of earphone.
The course of work of this circuit when system electrification is: when system switching S1 upwards closed-system power on, volume adjusting chip powers on immediately (namely POP sound noise exports immediately), power supply V1 makes the rapid conducting of the second field effect transistor Q2 and V2 signal ground by the charging circuit be made up of the first diode D1, the first triode Q1, the 3rd resistance R3, the second electric capacity C2, then through the first predetermined delay time T1, first triode Q1 ends, and makes the second field effect transistor Q2 cut-off and V2 signal recuperation normal (output audio signal); The power-up time delay circuit that power supply V1 is consisted of the 4th diode D4, the 6th resistance R6, the 4th electric capacity C4, through the second predetermined delay time T2, makes the voltage DC2 of active noise reduction chip reach the supply power voltage of active noise reduction chip permission.
Fig. 3 is that the one that one embodiment of the invention provides eliminates active noise reduction head circuit when system electrification, the change in voltage waveform schematic diagram of active noise reduction earphone; See Fig. 3,
In figure 3, the voltage process over time of the trumpet end of gray shade waveforms stands active noise reduction earphone, namely the voltage change process of earphone horn end is: when system electrification, second field effect transistor Q2 conducting causes V2 signal ground, through the first predetermined delay time T1, the voltage resume of trumpet end is to the state of output audio signal, and voltage signal is high level.The voltage signal DC2 process over time of the waveforms stands active noise reduction chip of lines, when system electrification, the voltage signal of DC2 completes and powers 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 are the coefficient between 0 ~ 1.Can make like this end of volume adjusting chip make an uproar by the time delay of active noise reduction chip power on and earphone horn ground connection carry out secondary noise reduction, simultaneously make an uproar and carry out a noise reduction by loudspeaker ground connection in the end of active noise reduction chip, and the first predetermined delay time and the second predetermined delay time are controlled to make sense of hearing nature within the scope of 0.7S.
In the present embodiment, V1=3.6V is set, R3=100K, C2=3.3uF, m=0.7, R6=50K, C4=10uF, calculates T1=R3*C2*Ln (V1/0.7)=0.54; T2=m*R6*C4=0.35.0.54 second is set to by the first predetermined delay time T1, second predetermined delay time T2 is set to 0.35 second, like this by setting different delay times, when effectively eliminating system electrification, cause the noise source of POP sound and audio signal to power on simultaneously thus cause user can hear this POP sound, reducing the problem of earphone tonequality.And can not impact user's experience in scope time T1 and T2 being arranged on 0.7 second.
In other embodiments of the present invention, the value of the first predetermined delay time T1 and the second predetermined delay time T2 can be arranged according to practical application, as long as meet the POP sound that can carry out in time when time delay elimination active noise reduction earphone powers on, user's sense of hearing can be ensured naturally when using earphone simultaneously.
The course of work of this circuit when system cut-off is: the downward closed-system power-off of system switching S1, now, and the power-off immediately of active noise reduction chip; Electric charge on first electric capacity C1 discharges through the discharge circuit of the second resistance R2, the first triode Q1, the 3rd resistance R3, the second diode D2, make the rapid conducting of the second field effect transistor Q2 and V2 signal ground, then elapsed time the 3rd predetermined delay time T3, discharge voltage is less than the conducting voltage of the first triode Q1 and ends, make the second field effect transistor Q2 cut-off and V2 signal recuperation normal (return to the state of output audio signal, namely the voltage signal of trumpet end returns to high level); Electric charge on 3rd electric capacity C3 is discharged by the 5th resistance R5, and through the 4th predetermined delay time T4, the voltage DC1 of volume adjusting chip is less than the supply power voltage of volume adjusting chip permission, and volume adjusting chip completes power-off.
Fig. 4 is that the one that one embodiment of the invention provides eliminates active noise reduction head circuit when system cut-off, the change in voltage waveform schematic diagram of active noise reduction earphone, see Fig. 4, during the power-off of gray shade waveforms stands, the time dependent waveform signal of the voltage of active noise reduction earphone horn end, the time dependent waveform signal of voltage of volume adjusting chip during the waveforms stands power-off of lines.See 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 end of volume adjusting chip can be made like this to make an uproar and to carry out secondary noise reduction by volume adjusting chip delay cut-off and earphone horn audio ground connection, simultaneously make an uproar and carry out a noise reduction by loudspeaker audio ground connection in the end of active noise reduction chip, and controlled by the third and fourth predetermined delay time to make sense of hearing nature within the scope of 0.7S.In the present embodiment, V1=3.6V is set, R2=50K, C1=10uF, n=0.3, R5=100K, C3=10uF.Calculate T3=R2*C1*Ln (V1/1.4)=0.47, T2=n*R5*C3=0.30.0.3 second is set to by the 4th predetermined delay time T4,3rd predetermined delay time T3 is set to 0.47 second, like this by setting different delay times, when effectively eliminating system cut-off, cause the noise source of POP sound and audio signal power-off simultaneously to cause user can hear this POP sound, reduce the problem of earphone tonequality.And can not impact user's experience in scope time T4 and T3 being arranged on 0.7 second.
In other embodiments of the invention, the 4th predetermined delay time T4 and the 3rd predetermined delay time T3 can be other numerical value, uses as long as the plosive when delay time arranged effectively can eliminate the power-off of active noise reduction earphone does not affect again user.
To sum up, the circuit of this elimination active noise reduction earphone plosion provided by the invention, by the scheduled time different to the noise source time delay producing POP sound in earphone, utilize level sequential effectively to eliminate active noise reduction earphone POP sound, improve the tonequality of active noise reduction earphone.In addition, this circuit structure simple, be easy to realize and with low cost.
Present invention also offers a kind of method except active noise reduction earphone plosion, the method comprises:
Between the power supply and loudspeaker of active noise reduction earphone, charge-discharge circuit is set; Between the power supply and active noise reduction chip of active noise reduction earphone, power-up time delay circuit is set; Between the power supply and volume adjusting chip of active noise reduction earphone, power-off delay circuit is set; Utilize charge-discharge circuit, when system electrification, control loudspeaker through the first predetermined delay time output audio signal; Or, when system cut-off, control loudspeaker return to output audio signal state through the 3rd predetermined delay time; Utilize power-up time delay circuit, when system electrification, the active noise reduction chip controlling active noise reduction earphone completes through the second predetermined delay time and powers on; Utilize power-off delay circuit, when system cut-off, the volume adjusting chip controlling active noise reduction earphone completes power-off through the 4th predetermined delay time.
In the present embodiment, charge-discharge circuit comprises: charging circuit and discharge circuit, charging circuit comprises the first diode, the second electric capacity, the 3rd resistance, the first triode, and discharge circuit comprises the first electric capacity, the second resistance, the second diode, the first triode, the 4th resistance, the second field effect transistor and the first resistance; Power-up time delay circuit comprises: the 4th diode, the 6th resistance and the 4th electric capacity; Power-off delay circuit comprises: the 3rd diode, the 5th resistance and the 3rd electric capacity; The positive pole of the first diode is connected with power supply through the system switching of active noise reduction earphone;
The negative pole of the first diode is connected with one end of the second resistance and the emitter of the first triode respectively; The other end of the 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 the first triode is connected with one end of the 3rd resistance;
The collector electrode of the first triode is connected with one end of the 4th resistance and the grid of the second field effect transistor respectively; The other end of the 3rd resistance 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 the second electric capacity; The negative pole of the second diode is connected with the positive pole of the first diode;
The other end of the 4th resistance is connected with the source electrode of the second field effect transistor and the other end of the second electric capacity respectively; The drain electrode of the second field effect transistor is connected through the positive pole of the first resistance with the loudspeaker of active noise reduction earphone; The minus earth of the loudspeaker of active noise reduction earphone; The positive pole of the 3rd diode is connected with the positive pole of the first diode; The negative pole of the 3rd diode is connected with one end of the 5th resistance, one end of the 3rd electric capacity and the volume adjusting chip of active noise reduction earphone respectively; The other end of the 3rd electric capacity is connected with the other end of the 5th resistance and ground connection;
The negative pole of the 4th diode is connected with one end of the 6th resistance and the positive pole of the first diode; The positive pole of the 4th diode 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 the 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 is greater than 0 second, and 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 greater 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 field effect transistor is NMOS tube.
It should be noted that, the method of this elimination active noise reduction earphone plosion of the present invention, the circuit structure of the elimination active noise reduction earphone plosion being and illustrate above is corresponding, thus, the performing step of the method for active noise reduction earphone plosion see the explanation of the course of work part of the circuit of aforementioned active noise reduction earphone plosion, can not repeat them here.
Present invention also offers a kind of active noise reduction earphone, this active noise reduction earphone comprises: the circuit of the elimination active noise reduction earphone plosion described in one aspect of the invention.This active noise reduction earphone owing to being integrated with the circuit of this elimination active noise reduction earphone plosion of the present invention thus in use, user can not hear power on, power-off and volume adjusting time plosive, there is better tonequality and user's experience.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. eliminate a circuit for active noise reduction earphone plosion, it is characterized in that, this circuit comprises: charge-discharge circuit, power-up time delay circuit and power-off delay circuit;
One end of described charge-discharge circuit is connected with power supply by the system switching of described active noise reduction earphone; The other end is connected with the loudspeaker of described active noise reduction earphone;
One end of described power-up time delay circuit is connected with power supply by the system switching of described active noise reduction earphone, and the other end is connected with the active noise reduction chip of described active noise reduction earphone;
One end of described power-off delay circuit is connected with power supply by the system switching of described active noise reduction earphone, and the other end is connected with the volume adjusting chip of described active noise reduction earphone;
Described charge-discharge circuit, for when system electrification, controls described loudspeaker through the first predetermined delay time output audio signal; Or, when system cut-off, control described loudspeaker return to output audio signal state through the 3rd predetermined delay time;
Described power-up time delay circuit, for when system electrification, the active noise reduction chip controlling described active noise reduction earphone completes through the second predetermined delay time and powers on;
Described power-off delay circuit, for when system cut-off, the volume adjusting chip controlling described active noise reduction earphone completes power-off through the 4th predetermined delay time.
2. circuit as claimed in claim 1, is characterized in that,
Described charge-discharge circuit comprises: charging circuit and discharge circuit, described charging circuit comprises the first diode, the second electric capacity, the 3rd resistance, the first triode, and described discharge circuit comprises the second resistance, the second diode, the first triode, the first electric capacity, the 4th resistance, the second field effect transistor and the first resistance; Described power-up time delay circuit comprises: the 4th diode, the 6th resistance and the 4th electric capacity;
Described power-off delay circuit comprises: the 3rd diode, the 5th resistance and the 3rd electric capacity;
The positive pole of described first diode is connected with power supply through the system switching of described active noise reduction earphone;
The negative pole of described first diode is connected with one end of described second resistance and the emitter of described first triode respectively;
The other end of described second resistance is connected with one end of described first electric capacity, the other end ground connection of described first electric capacity;
The base stage of described first triode is connected with one end of described 3rd resistance;
The collector electrode of described first triode is connected with one end of described 4th resistance and the grid of described second field effect transistor respectively;
The other end of described 3rd resistance is connected with the positive pole of described second diode and one end of described second electric capacity respectively;
The other end ground connection of described second electric capacity;
The negative pole of described second diode is connected with the positive pole of described first diode;
The other end of described 4th resistance is connected with the source electrode of described second field effect transistor and the other end of described second electric capacity respectively;
The drain electrode of described second field effect transistor is connected through the positive pole of described first resistance with the loudspeaker of described active noise reduction earphone;
The minus earth of the loudspeaker of described active noise reduction earphone;
The positive pole of described 3rd diode is connected with the positive pole of described first diode;
The negative pole of described 3rd diode is connected with the volume adjusting chip of one end of described 5th resistance, one end of the 3rd electric capacity and described active noise reduction earphone respectively;
The other end of described 3rd electric capacity is connected with the other end of described 5th resistance and ground connection;
The negative pole of described 4th diode is connected with one end of described 6th resistance and the positive pole of described first diode;
The positive pole of described 4th diode is connected with the active noise reduction chip of the other end of described 6th resistance, one end of the 4th electric capacity and described active noise reduction earphone respectively;
The other end ground connection of described 4th electric capacity.
3. circuit as claimed in claim 2, it is characterized in that, described first scheduled delay is determined by the 3rd resistance, the second electric capacity and supply voltage; Described second scheduled delay is determined by the 6th resistance, the 4th electric capacity; Described 3rd scheduled delay is determined by the second resistance, the first electric capacity and supply voltage; Described 4th scheduled delay is determined by the value of the 5th resistance and the 3rd electric capacity.
4. the circuit according to any one of claim 1-3, is characterized in that, described second predetermined delay time is less than described first predetermined delay time, and described second predetermined delay time is greater than 0 second, and described first predetermined delay time is less than 0.7 second;
Described 4th predetermined delay time is less than described 3rd predetermined delay time, and described 4th predetermined delay time is greater than 0 second, and described 3rd predetermined delay time is less than 0.7 second.
5. circuit as claimed in claim 2, it is characterized in that, described first triode is PNP triode;
Described second field effect transistor is NMOS tube.
6. an active noise reduction earphone, is characterized in that, described active noise reduction earphone comprises: the circuit of the elimination active noise reduction earphone plosion according to any one of claim 1-3.
7. eliminate a method for active noise reduction earphone plosion, it is characterized in that, the method comprises:
Between the power supply and loudspeaker of described active noise reduction earphone, charge-discharge circuit is set;
Between the power supply and active noise reduction chip of described active noise reduction earphone, power-up time delay circuit is set;
Between the power supply and volume adjusting chip of described active noise reduction earphone, power-off delay circuit is set;
Utilize described charge-discharge circuit, when system electrification, control described loudspeaker through the first predetermined delay time output audio signal; Or, when system cut-off, control described loudspeaker return to output audio signal state through the 3rd predetermined delay time;
Utilize described power-up time delay circuit, when system electrification, the active noise reduction chip controlling described active noise reduction earphone completes through the second predetermined delay time and powers on;
Utilize described power-off delay circuit, when system cut-off, the volume adjusting chip controlling described active noise reduction earphone completes power-off through the 4th predetermined delay time.
8. method as claimed in claim 7, is characterized in that,
Described charge-discharge circuit comprises: charging circuit and discharge circuit, and described charging circuit comprises discharge circuit described in the first diode, the second electric capacity, the 3rd resistance, the first triode and comprises the second resistance, the second diode, the first triode, the first electric capacity, the 4th resistance, the second field effect transistor and the first resistance;
Described power-up time delay circuit comprises: the 4th diode, the 6th resistance and the 4th electric capacity;
Described power-off delay circuit comprises: the 3rd diode, the 5th resistance and the 3rd electric capacity;
The positive pole of described first diode is connected with power supply through the system switching of described active noise reduction earphone;
The negative pole of described first diode is connected with one end of described second resistance and the emitter of described first triode respectively;
The other end of described second resistance is connected with one end of described first electric capacity, the other end ground connection of described first electric capacity;
The base stage of described first triode is connected with one end of described 3rd resistance;
The collector electrode of described first triode is connected with one end of described 4th resistance and the grid of described second field effect transistor respectively;
The other end of described 3rd resistance is connected with the positive pole of described second diode and one end of described second electric capacity respectively;
The other end ground connection of described second electric capacity;
The negative pole of described second diode is connected with the positive pole of described first diode;
The other end of described 4th resistance is connected with the source electrode of described second field effect transistor and the other end of described second electric capacity respectively;
The drain electrode of described second field effect transistor is connected through the positive pole of described first resistance with the loudspeaker of described active noise reduction earphone;
The minus earth of the loudspeaker of described active noise reduction earphone;
The positive pole of described 3rd diode is connected with the positive pole of described first diode;
The negative pole of described 3rd diode is connected with the volume adjusting chip of one end of described 5th resistance, one end of the 3rd electric capacity and described active noise reduction earphone respectively;
The other end of described 3rd electric capacity is connected with the other end of described 5th resistance and ground connection;
The negative pole of described 4th diode is connected with one end of described 6th resistance and the positive pole of described first diode;
The positive pole of described 4th diode is connected with the active noise reduction chip of the other end of described 6th resistance, one end of the 4th electric capacity and described active noise reduction earphone respectively;
The other end ground connection of described 4th electric capacity.
9. method as claimed in claim 7 or 8, is characterized in that,
Described second predetermined delay time is less than described first predetermined delay time, and described second predetermined delay time is greater than 0 second, and described first predetermined delay time is less than 0.7 second;
Described 4th predetermined delay time is less than described 3rd predetermined delay time, and described 4th predetermined delay time is greater than 0 second, and described 3rd predetermined delay time is less than 0.7 second.
10. method as claimed in claim 8, it is characterized in that, described first triode is PNP triode;
Described second field effect transistor is NMOS tube.
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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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