CN108419162A - Active denoising method, active noise reducing device and noise cancelling headphone - Google Patents
Active denoising method, active noise reducing device and noise cancelling headphone Download PDFInfo
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- CN108419162A CN108419162A CN201810136380.XA CN201810136380A CN108419162A CN 108419162 A CN108419162 A CN 108419162A CN 201810136380 A CN201810136380 A CN 201810136380A CN 108419162 A CN108419162 A CN 108419162A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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Abstract
The present invention relates to a kind of active denoising method, active noise reducing device and noise cancelling headphones, the active denoising method, when receiving calibration command, the first switching command is sent, the first voice signal of the transmission that calibration voice signal and feedback microphones are acquired when horn single body plays calibration voice signal is received.At this point, being in calibration phase, the first filter command is exported to feedback filter according to the first voice signal and calibration voice signal.After the completion of calibration, send the second switching command, feedback filter is set to generate the first noise correction signal for offsetting earphone internal noise according to the first filter command, the audio sound signal and the first noise correction signal for so that horn single body playing audio signal source is sent, at this point, being in normal work stage.This method can improve the accuracy of internal noise identification, and then improve the noise reduction of earphone by being that reference is calibrated with standard signal.
Description
Technical field
The present invention relates to noise reduction technology fields, more particularly to a kind of active denoising method, active noise reducing device and noise reduction
Earphone.
Background technology
Active noise reduction refers to acquisition environmental noise, and carries out phse conversion to noise with the technology of offset noise.
Traditionally in active noise reduction techniques, filter is typically utilized, generates and differs 180 DEG C anti-with noise signal phase
Phase signals, the inversion signal restored by loudspeaker and noise cancellation.That is, the filtering parameter of filter is fixed, in any ring
Border is all to carry out identical phse conversion processing to any sound wave.This mode cannot truly reflect that the inside of current environment is made an uproar
Sound, the noise reduction played are limited.
Invention content
Based on this, it is necessary to be directed to the problem of existing earphone noise reduction difference, provide a kind of active denoising method, actively drop
It makes an uproar device and noise cancelling headphone.
A kind of active denoising method, including：
Receive calibration command；
Calibration command is responded, the first switching command is sent；First switching command is for making calibration signal source send school
Quasi- voice signal makes horn single body play the calibration voice signal；
Described in the calibration voice signal and feedback microphones of acquisition calibration signal source output are played in the horn single body
Calibrate the first voice signal acquired when voice signal；
The first filter command is exported to feedback filter according to the calibration voice signal and first voice signal；
The second switching command is sent, second switching command is for making the feedback filter be filtered according to described first
Instruction generates the first noise correction signal for offsetting earphone internal noise, and horn single body playing audio signal source is made to send out
The audio sound signal and the first noise correction signal sent.
In one embodiment, the method further includes：
According to first filter command, the second filter command is exported to compensating filter；Second filter command is used
The audio sound signal that audio signal source exports is compensated in the instruction compensating filter.
In one embodiment, second switching command, being additionally operable to, which makes horn single body play feedforward microphone, is handled
The the second noise correction signal arrived；It makes an uproar the outside that the second noise correction signal acquires feedforward microphone by feedforward filter
Acoustic intelligence carries out reverse phase and handles to obtain.
A kind of active noise reducing device, including：
Control circuit, feedback filter and it is provided with feedback microphones and the audio main body of horn single body；
First switch, the movable contact of the first switch are connect with the feedback microphones, and the first stationary contact is filtered with feedback
Wave device connects, and the second stationary contact is connect with control circuit；
Second switch, the movable contact of the second switch are connect with the horn single body, the first stationary contact and audio signal
Source connects, and the second stationary contact is connect with calibration signal source；
Third switchs, and the third switch is arranged between calibration signal source and control circuit；
The first switch, the second switch, third switch and the feedback filter, believe with the control circuit
Number connection；
The control circuit responds calibration command, and the is sent to the first switch, the second switch and third switch
One switching command；Control movable contact and the second stationary contact connection of first switch, the movable contact of the second switch and second quiet
Contacting and third switch are closed；
The calibration voice signal and feedback microphones that the control circuit is exported according to calibration signal source are in the loudspeaker list
Body plays the first voice signal acquired when the calibration voice signal, and the first filter command is exported to the feedback filter；
The control circuit also switchs to the first switch, second switch and third and sends the second switching command, control
The movable contact of the first switch and the first stationary contact are connected, and the movable contact of the second switch and the first stationary contact are connected, with
And the third switch disconnects.
In one embodiment, active noise reducing device further include connect with the audio signal source, with the control circuit
The compensating filter of signal connection；The control circuit is according to first filter command, to compensating filter output the
Two filter commands.
In one embodiment, the audio main body is additionally provided with feedforward microphone；The active noise reducing device include with
The feedforward microphone connection feedforward filter and the 4th switch；4th switch is connect with the control circuit signal, institute
It states control circuit control the 4th switch to be closed according to second switching command, the feedforward filter is to feedforward microphone
The external noise information of acquisition carries out reverse phase and handles to obtain the second noise correction signal.
In one embodiment, active noise reducing device further includes computing circuit；
The input terminal of the computing circuit is filtered with the feedback filter, the movable contact of second switch and the feedforward
Device connects, and the output end of the computing circuit is connect with the horn single body.
In one embodiment, the computing circuit includes adder.
In one embodiment, the control circuit includes detection circuit and controller；The input terminal of the detection circuit
It is connect with the second stationary contact of third switch and the first switch；The output end of the detection circuit and the control
The input terminal of device connects；The output end of the controller and the feedback filter, the first switch, second switch and third
Switch connection；
The detection circuit detects the internal noise of each frequency range, institute according to the calibration voice signal and the first voice signal
It states internal noise of the controller based on each frequency range and exports the first filter command to the feedback filter.
A kind of noise cancelling headphone, including above-mentioned active noise reducing device.
Above-mentioned active denoising method, active noise reducing device and noise cancelling headphone sends first when receiving calibration command
Switching command exports the first filter command to feedback filter according to the first voice signal and calibration voice signal.It is calibrating
Cheng Hou sends the second switching command, and earphone is in normal work stage.For earphone in normal work, feedback filter is to feeding back wheat
The voice signal of gram wind input, is filtered according to the first filter command obtained from calibration phase.Due to the first filtering
Instruction is obtained according to the first voice signal and calibration sound, by calibrate sound as reference, can determine the first voice signal
In internal noise, and corresponding with internal noise filter command is generated, when to work normally, according to calibration phase determination
Filter command handles the voice signal of feedback microphones acquisition, and the noise reduction process of this method is no longer to internal noise
Simple and identical reverse phase processing is carried out, but using standard signal as reference, the accuracy of internal noise identification can be improved, into
And improve the noise reduction of earphone.
Description of the drawings
Fig. 1 is the application environment schematic diagram of the active denoising method of one embodiment；
Fig. 2 is the flow chart of the active denoising method of one embodiment；
Fig. 3 is the connection relationship diagram of the active noise reducing device of one embodiment；
Fig. 4 is the connection relationship diagram of the active noise reducing device of another embodiment；
Fig. 5 is the connection relationship diagram of the active noise reducing device of another embodiment.
Specific implementation mode
Active denoising method provided by the present application can be applied in application environment as shown in Figure 1.The application environment packet
Earphone 101 and terminal 102 are included, earphone 101 is connect with the terminal 102 of adaptation, is specifically as follows wired connection, or be wirelessly connected
(such as bluetooth).Terminal 102 be the equipment with playing function, for example, radio, music player, mobile phone, tablet computer and
Personal PC etc..Control circuit is provided in earphone 101, control circuit receives calibration command, responds calibration command, sends first and cuts
Instruction is changed, the first switching command makes horn single body play calibration sound letter for making calibration signal source send calibration voice signal
Number.At this point, earphone is in align mode.Control circuit receives the calibration voice signal of calibration signal source output, and in loudspeaker
The first voice signal for acquiring when monomer plays calibration voice signal, according to calibration voice signal and the output of the first voice signal the
One filter command is to feedback filter.After calibration, control circuit sends the second switching command, and the second switching command is used for
So that feedback filter is generated the first noise correction signal for offsetting earphone internal noise according to the first filter command, makes loudspeaker
The audio sound signal and the first noise correction signal that monomer playing audio signal source is sent.At this point, earphone is in normal use
State.When earphone is in normal operating condition, the first noise correction signal that horn single body plays can be offset inside earphone
Noise reaches noise reduction.
A kind of active denoising method is run in the control circuit in earphone 101, as shown in Fig. 2, this method includes following step
Suddenly：
S202 receives calibration command.
Wherein, calibration command is the signal for starting headphone calibration sent to control circuit.Calibration command can be by
Headset user is sent by terminal 102 to control circuit.For example, terminal operating has earphone to control application program, when user is in
When new environment, by being triggered in terminal operation, the control circuit into earphone 101 sends calibration command, starts headphone calibration.
Calibration command can also be sent by operating earphone to control circuit from headset user.Specifically, earphone is provided with calibration switch.
When user opens calibration switch, control circuit receives calibration command.
S202 responds calibration command, sends the first switching command.First switching command is for making calibration signal source send school
Quasi- voice signal makes horn single body play calibration voice signal.
Calibration voice signal is sent out by calibration signal source.It is simply melodious to calibrate voice signal, the typical frequency range of frequency range covering, such as
Include the standard voice of the frequency ranges such as 32Hz, 63Hz, 125Hz, 250Hz, 500Hz and 1KHz.Calibration signal source can be in earphone
The memory in portion, calibration voice signal are storable in memory, and memory may be provided inside earphone, for example, In-Ear ear
The control unit of machine.Calibration signal source can also be the terminal being connect with earphone 101.Calibration sound is stored in the memory of terminal
Sound.
Control circuit can be to be integrated with the control chip of control program, and control circuit has corresponding pin, with calibration
Signal source is connected with feedback microphones.Wherein, feedback microphones are arranged in audio main body, the signal receiving end of feedback microphones
Towards the pronunciation part of audio main body, the internal noise inside audio main body can be received.Horn single body is arranged in audio main body,
For playing voice signal.
When earphone is in normal work (i.e. audio plays work), calibration signal source separated, school with control circuit
Calibration signal source is separated with horn single body, and feedback microphones are separated with control circuit.It, can in specifically embodiment
It is arranged and switchs being turned on or off between controlling above-mentioned component.The setting of switch and the specific connection type of circuit, can be neatly
It is arranged as required to, is not limited in the present embodiment.
In a kind of specific embodiment, it is provided with first switch, first switch can be single-pole double-throw switch (SPDT), move
Contact is connect with feedback microphones, and the first stationary contact is connect with feedback filter, and the second stationary contact is connect with control circuit.
When the movable contact of first switch and the second stationary contact are connected, feedback microphones are connected with control circuit, feedback microphones acquisition
Voice signal can be input to control circuit.
It is additionally provided with second switch, second switch can be single-pole double-throw switch (SPDT).The movable contact of second switch and loudspeaker list
Body connects, and the first stationary contact of second switch is connect with audio signal source, and the second stationary contact is connect with calibration signal source.When second
When the movable contact of switch and the second stationary contact are connected, horn single body is connected with calibration signal source, is played and is calibrated by horn single body
The calibration sound of signal source.
It is additionally provided with third switch, third switch is arranged between calibration signal source and control circuit.When third switch closes
When conjunction, calibration signal source is connected with control circuit.Control circuit receives the calibration voice signal of calibration signal source.
First switch, second switch and third switch are connect with control circuit signal.Refer to when control circuit receives calibration
After order, calibration command is responded, is switched to first switch, second switch and third and sends the first switching command.First switch, second
Switch and third switch are acted according to the first switching command, so that calibration signal source is sent calibration sound, horn single body is made to play school
Quasi- sound.
S206, the calibration voice signal and feedback microphones for obtaining calibration signal source output play school in horn single body
The first voice signal acquired when quasi- voice signal.
Specifically, after calibration signal source is connected with control circuit, the calibration voice signal that calibration signal source is sent is controlled
Circuit receives.
After calibration signal source is connected with horn single body, the calibration sound that calibration signal source is sent is played by horn single body.
The signal receiving end of feedback microphones towards audio main body pronunciation part (horn main body), acquisition calibration sound and earphone it is interior
Portion's noise obtains the first voice signal.That is the first voice signal includes internal noise and calibration sound.
After feedback microphones are connected with control circuit, feedback microphones send the first voice signal to control circuit.
S208 exports the first filter command to feedback filter according to calibration voice signal and the first voice signal.
The internal noise of earphone is not constant, and it is related to wear the mode of earphone with residing environment and user.Work as ring
When border noise is big, the internal noise of earphone increases therewith.By taking In-Ear Headphones as an example, if earphone is not complete because of wearing mode mistake
Complete is placed on ear intracavitary, then the noise entered inside earphone increases therewith.That is, the internal noise of earphone may be because wearing
The variation of mode or local environment and change.When user is in different noise circumstances or wearing mode changes, ear can be passed through
Calibration switch or terminal the triggering calibration of machine.
First voice signal includes calibration voice signal and internal noise signal, by being joined on the basis of calibrating voice signal
According to, compare the first voice signal and calibration voice signal, generate the first filter command, the first filter command for adjust feedback filter
The output of wave device.In the present embodiment, the output of feedback filter is no longer the fixation of the voice signal acquired to feedback microphones
Phase adjustment (such as 180 degree reverse phase), but the reference on the basis of calibrating sound compare the first voice signal and calibration sound letter
Number, generate the first filter command.First filter command includes filter factor, so that feedback filter is adjusted according to filter factor and inputs
Voice signal phase, generate the first noise correction signal for offsetting internal noise, as much as possible reduction calibration sound
Signal plays the effect for earphone internal noise of forgoing.
In a specific embodiment, control circuit uses adaptive filter algorithm.I.e. according to calibration voice signal
The step of the first filter command to feedback filter being exported with the first voice signal, including：Using adaptive filter algorithm, according to
Calibration voice signal and the first voice signal determine the first filter command, and the first filter command is sent to feedback filter.
Wherein, calibration voice signal be reference signal, the first sound be input signal, the first voice signal be include mix it is miscellaneous
The voice signal of internal noise and reference signal.By adaptive filter algorithm, determines the filter factor of filter, make filtering
The output of device is close to desired reference signal, to filter out internal noise.Control circuit filters first including filter factor
Wave instruction is sent to feedback filter.Least mean-square error (LMS) calculation can be used in adaptive filter algorithm in present embodiment
Method and fast RLS algorithm etc., do not limit in present embodiment.
In another particular embodiment of the invention, referred to according to calibration voice signal and the first filtering of the first voice signal output
The step of enabling to feedback filter, including：Frequency-division section compares calibration voice signal and the first voice signal, according to comparison
As a result the filter factor for determining the corresponding subfilter of each frequency range generates the first filtering according to the filter factor of each frequency range and refers to
It enables, the first filter command is sent to feedback filter, feedback filter includes the corresponding subfilter of each frequency range.
Control circuit includes detection circuit and controller.Detection circuit is connected by calibration signal source with feedback filter.Inspection
Slowdown monitoring circuit is compared and is analyzed to calibration signal source and the first voice signal frequency-division section.Specifically, detection circuit can be divided into more
A frequency range, such as 32Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1KHz etc..Feedback filter includes the corresponding sub- filter of each frequency range
Wave device, each subfilter lay particular emphasis on the voice signal handled within the scope of a certain frequency values.By to calibration signal source and
One voice signal compares and analyzes, and determines the frequency range where internal noise.For the frequency range where determining internal noise, really
The filter factor for determining the corresponding subfilter of each frequency range makes the voice signal of the output of subfilter be forced with calibration voice signal
Closely.The first filter command is generated according to the filter factor of each wave band, each subfilter is handled according to corresponding filter factor,
Each subfilter is finally fitted to a response curve.
S210 sends the second switching command, and the second switching command is for making feedback filter be produced according to the first filter command
Raw the first noise correction signal for offsetting earphone internal noise, the audio sound for making horn single body playing audio signal source send
Sound signal and the first noise correction signal.
After the completion of calibration, control circuit terminates to calibrate, into normal work stage.Specifically, control circuit sends the
Two switching commands, the second switching command are made an uproar for offsetting inside earphone for making feedback filter be generated according to the first filter command
First noise correction signal of sound, the audio sound signal for making horn single body playing audio signal source send and the first noise correction
Signal.Specifically, feedback filter connects horn single body, when the movable contact of first switch and the connection of the first stationary contact, feedback
Microphone is connected with feedback filter.When the movable contact of second switch and the first stationary contact are connected, horn single body is believed with audio
The conducting of number source.
After completing sound calibration, control circuit sends the second switching to first switch, second switch and third switch and refers to
It enables.First switch, second switch and third switch are acted according to the second switching command.Specifically, third switch disconnects, calibration letter
Number source stops output to control circuit.The movable contact of first switch and the first stationary contact are connected, at this point, feedback filter and feedback
Microphone is connected.The movable contact of second switch and the first stationary contact are connected, at this point, horn single body is connect with audio signal source, sound
The audio sound signal of frequency source signal is played by horn single body.Feedback microphones acquisition horn single body plays sound and obtains second
Voice signal.Second sound signal includes the internal noise of earphone.Feedback microphones are according to the filtering system in the first filter command
Number, is filtered second sound signal, generates the first noise correction signal.First noise correction signal is for offsetting the
Internal noise in two voice signals.The voice signal and second sound signal of audio signal source are played by horn single body,
In first noise correction signal cancellation internal noise.
Above-mentioned active denoising method sends the first switching command, for making calibration signal when receiving calibration command
Source sends calibration voice signal, and horn single body is made to play calibration voice signal, and then receives calibration voice signal and feedback Mike
First voice signal of the transmission that wind is acquired when horn single body plays calibration voice signal.At this point, earphone is in calibration phase,
First voice signal plays calibration sound by feedback microphones acquisition horn single body and obtains, thus, the first voice signal includes
Calibrate voice signal and earphone internal noise signal.In calibration phase, according to the first voice signal and calibration voice signal output
First filter command is to feedback filter.After the completion of calibration, the second switching command is sent, makes feedback filter according to the first filter
Wave instruction generates the first noise correction signal for offsetting earphone internal noise, and horn single body playing audio signal source is made to send
Audio sound signal and the first noise correction signal, at this point, earphone is in normal work stage.Earphone is in normal work, instead
Feedback filter voice signal that feedback microphones inputs, from the first filter command that foundation is obtained from calibration phase is filtered
Reason.It, can be true by calibrate sound as reference since the first filter command is obtained according to the first voice signal and calibration sound
Internal noise in fixed first voice signal, and filter command corresponding with internal noise is generated, when to work normally, according to
The filter command that calibration phase determines is handled the voice signal of feedback microphones acquisition, the noise reduction process of this method, no
It is simple to internal noise progress and identical reverse phase processing again, but using standard signal as reference, internal noise can be improved
The accuracy of identification, and then improve the noise reduction of earphone.
In another embodiment, active denoising method further includes：According to the first filter command, exported to compensating filter
Second filter command, the second filter command are used to indicate compensating filter and are carried out to the audio sound signal that audio signal source exports
Compensation.
In actual application, because feedback filter is modified (phse conversion) noise according to the first filter command
When, if certain frequency ranges of the audio played are identical as the frequency range of noise, while feedback filter changes noise phase
Inevitably the phase of source sound can be changed, this is the destruction to sound source sound quality in fact.In this regard, in the present embodiment
Provided with compensating filter.The input terminal of compensating filter is connect with audio signal source.Control circuit according to the first filter command,
Generate the second filter command.I.e. the second filter command is related to the first filter command, is specifically as follows the filtering system of corresponding frequency band
Number, makes compensation, with Compensation Feedback filter to sound source sound by compensating filter to the corresponding frequency band of the audio signal of broadcasting
Caused by damage.
Above-mentioned active denoising method utilizes compensation filter on the basis of carrying out noise reduction process using feedback filter
Device compensates the audio of broadcasting, is damaged caused by sound source sound with Compensation Feedback filter, and noise reduction while ensures sound
Sound is lossless.
In another embodiment, the second switching command, being additionally operable to, which makes horn single body play feedforward microphone, handles to obtain
The second noise correction signal；The external noise information that second noise correction signal acquires feedforward microphone by feedforward filter
Reverse phase is carried out to handle to obtain.
Specifically, audio main body further includes feedforward microphone, and feedforward microphone is arranged on the shell of earphone, and signal connects
For receiving end towards the outside of shell, feedforward microphone farther out, determines that feedforward microphone can just receive at a distance from horn single body
To the environmental noise of hull outside.It is additionally provided with the 4th switch, one end is connect with feedforward filter, the other end and horn single body
Connection.Control circuit is also connect with the 4th switching signal.In calibration phase, the 4th switch of control circuit control is disconnected, is avoided anti-
Feedback filter generates revise signal according to the external noise that feedforward microphone acquires, and interference is generated to calibration.In the normal work of earphone
Make the stage, the 4th switch of control circuit control is closed, feedforward filter work.Feedforward microphone receive environmental noise, then by
Feedforward filter will be sent out after the environmental noise paraphase 180 degree by loudspeaker, counteract external environmental noise.
Above-mentioned active denoising method offsets internal noise using feedback filter, is offset using feedforward filter external
Noise substantially increases the noise reduction capability of earphone under the collective effect of feedforward filter and feedback filter.
In one embodiment, as shown in figure 3, providing a kind of active noise reducing device, which includes：
Audio main body 310, feedback filter 320, control circuit 330, first switch 340, second switch 350 and third are opened
Close 380.Wherein, audio main body is provided with feedback microphones 3101 and horn single body 3102.The movable contact of first switch 340 with it is anti-
It presents microphone 3101 to connect, the first stationary contact of first switch 340 is connect with feedback filter 320, the second stationary contact and control
Circuit 330 connects.The movable contact of second switch 350 is connect with horn single body 3102, the first stationary contact and sound of second switch 350
Frequency source signal 360 connects, and the second stationary contact is connect with calibration signal source 370.Third switch 380 is arranged in calibration signal source 370
Between control circuit 330.First switch 340, second switch 350, third switch 380 and feedback filter 320, with control
330 signal of circuit connects.
Control circuit 330 responds calibration command, to first switch 340, second switch 350 and third switch 380 transmission the
One switching command, the movable contact and the second stationary contact for controlling first switch 340 are connected, the movable contact of second switch 350 and second
Stationary contact is connected and third switch 380 is closed, at this point, earphone is in calibration phase.
The calibration voice signal and feedback microphones that control circuit 330 is exported according to calibration signal source are in horn single body 3102
The first voice signal acquired when calibration voice signal is played, the first filter command is exported to feedback filter 320.
Control circuit 330 also sends the second switching command to first switch 340, second switch 350 and third switch 380,
The movable contact and the first stationary contact for controlling first switch 340 are connected, and the movable contact of second switch 350 and the first stationary contact are connected,
And third switch 380 disconnects, at this point, earphone is in normal work stage.
Specifically, feedback microphones 3101 are arranged in audio main body 310, the signal receiving end court of feedback microphones 3101
To the pronunciation part of audio main body, the internal noise inside audio main body can be received.Horn single body is arranged in audio main body, uses
In playing voice signal, including the calibration sound that sends out of the internal noise of earphone, calibration signal source and audio signal source are sent out
Useful sound etc..
Control circuit 330 includes being integrated with the control chip of control program, and control chip has corresponding pin, with feedback
Filter 320, first switch 340, second switch 350 are opened 380 with third pass and are connected by respective pin.
First switch 340 can be single-pole double-throw switch (SPDT), and movable contact is connect with feedback microphones 3101, the first stationary contact
Point is connect with feedback filter 320, and the second stationary contact is connect with control circuit 330.When the movable contact of first switch 340 and
When two stationary contacts are connected, feedback microphones 3101 are connected with control circuit 330.When the movable contact of first switch 340 and second quiet
When contacting, feedback microphones 3101 are connected with control circuit 330.
Second switch 350 can be single-pole double-throw switch (SPDT).The movable contact of second switch 350 is connect with horn single body 3102,
First stationary contact of second switch 350 is connect with audio signal source 360, and the second stationary contact is connect with calibration signal source 370.When
When the movable contact of two switches 350 and the second stationary contact are connected, horn single body 3102 is connected with calibration signal source, passes through horn single body
3102 play the calibration sound of calibration signal source.When the movable contact of second switch and the first stationary contact are connected, horn single body
3102 connect with audio signal source, by the audio sound in 3102 playing audio signal source of horn single body, i.e., useful sound.
Specifically, calibration signal source is for sending calibration sound.It is simply melodious to calibrate sound, the typical frequency range of frequency range covering,
It such as include the standard voice of the frequency ranges such as 32Hz, 63Hz, 125Hz, 250Hz, 500Hz and 1KHz.Calibration signal source can be earphone
Internal memory, calibration sound are storable in memory, and memory may be provided inside earphone, for example, In-Ear Headphones
Control unit.Calibration signal source can also be the terminal being connect with earphone 101.Calibration sound is stored in the memory of terminal.
Third switch 380 is arranged between calibration signal source 370 and control circuit 330.When third switch 380 is closed,
Calibration signal source 370 is connected with control circuit 330.Control circuit receives the calibration voice signal of calibration signal source.
Specifically the course of work is as follows：
1, control circuit receives calibration command.
Calibration command is the signal for starting calibration sent to control circuit.Calibration command can be led to by headset user
Terminal 102 is crossed to send to control circuit.For example, terminal operating has earphone to control application program, when user is in new environment,
By being triggered in terminal operation, the control circuit into earphone 101 sends calibration command, starts headphone calibration.Calibration command is also
It can be sent from headset user to control circuit by operating earphone.Specifically, earphone is provided with calibration switch.When user opens
When calibration switch, control circuit receives calibration command.
2, calibration command is responded, sending the first switching to first switch 340, second switch 350 and third switch 380 refers to
It enables.First switch 340 is connected according to the first switching command, movable contact and the second stationary contact, makes feedback microphones 3101 and control
Circuit 330 processed is connected.Second switch 350 is connected according to the second switching command, movable contact and the second stationary contact, makes horn single body
3102 connect with calibration signal source, and the calibration sound of calibration signal source is played by horn single body 3102.Feedback microphones 3101
The first voice signal is acquired when horn single body plays calibration voice signal.First voice signal includes internal noise signal and school
Quasi- voice signal.Third switch 380 is closed according to the first switching command, and calibration signal source is made to be connected with control circuit, receives school
Quasi- voice signal.At this point, earphone enters calibration mode.
3, control circuit conveys the first filter command to feedback filter according to calibration voice signal and the first voice signal.
The internal noise of earphone is not constant, and it is related to wear the mode of earphone with residing environment and user.Work as ring
When border noise is big, the internal noise of earphone increases therewith.By taking In-Ear Headphones as an example, if earphone is not complete because of wearing mode mistake
Complete is placed on ear intracavitary, then the noise entered inside earphone increases therewith.That is, the internal noise of earphone may be because wearing
The variation of mode or local environment and change.When user is in different noise circumstances or wearing mode changes, ear can be passed through
Calibration switch or terminal the triggering calibration of machine.
First voice signal includes calibration voice signal and internal noise signal, by being joined on the basis of calibrating voice signal
According to, compare the first voice signal and calibration voice signal, generate the first filter command, the first filter command for adjust feedback filter
The output of wave device.In the present embodiment, the output of feedback filter is no longer the fixation of the voice signal acquired to feedback microphones
Phase adjustment (such as 180 degree reverse phase), but the reference on the basis of calibrating sound compare the first voice signal and calibration sound letter
Number, generate the first filter command.First filter command includes filter factor, so that feedback filter is adjusted according to filter factor and inputs
Voice signal phase, generate the first noise correction signal for offsetting internal noise, as much as possible reduction calibration sound
Signal plays the effect for earphone internal noise of forgoing.
In a specific embodiment, control circuit use adaptive filter algorithm, according to calibration voice signal and
First voice signal determines the first filter command, and the first filter command is sent to feedback filter.
Wherein, calibration voice signal be reference signal, the first sound be input signal, the first voice signal be include mix it is miscellaneous
The voice signal of internal noise and reference signal.By adaptive filter algorithm, determines the filter factor of filter, make filtering
The output of device is close to desired reference signal, to filter out internal noise.Control circuit filters first including filter factor
Wave instruction is sent to feedback filter.Least mean-square error (LMS) calculation can be used in adaptive filter algorithm in present embodiment
Method and fast RLS algorithm etc., do not limit in present embodiment.
4, after the completion of calibrating, control circuit sends second to first switch 340, second switch 350 and third switch 380 and cuts
Change instruction.First switch 340 is connected according to the second switching command, movable contact and the first stationary contact, makes feedback microphones 3101
It is connected with feedback filter 320.Second switch 350 is connected according to switching command, movable contact and the first stationary contact, makes loudspeaker list
Body 3102 is connected with audio signal source 370, and the audio sound signal of audio signal source 370 is played by horn single body 3101.The
Three switches 380 are closed, and control circuit stops receiving calibration sound.At this point, earphone enters normal mode of operation.
When earphone works normally, feedback microphones 3101 acquire horn single body broadcasting audio sound signal and obtain second sound
Signal.Second sound signal includes the internal noise and audio sound signal of earphone.Feedback microphones are according to the first filter command
In filter factor, second sound signal is filtered, generate the first noise correction signal.First noise correction signal
For offsetting the internal noise in second sound signal.The voice signal and second sound signal of audio signal source pass through loudspeaker list
Body plays, the first noise correction signal cancellation therein internal noise.
Above-mentioned active noise reducing device, when receiving calibration command, control circuit sends the first switching command, each to switch
Work, calibration signal source send calibration voice signal, and horn single body plays calibration voice signal, and then control circuit obtains calibration
First voice signal of the transmission that voice signal and feedback microphones are acquired when horn single body plays calibration voice signal.This
When, earphone is in calibration phase, and the first voice signal plays calibration sound by feedback microphones acquisition horn single body and obtains, because
And the first voice signal includes calibration voice signal and earphone internal noise signal.In calibration phase, believed according to the first sound
Number and calibration voice signal export the first filter command to feedback filter.After the completion of calibration, control circuit is sent out to each switch
The second switching command, feedback filter is sent to be generated according to the first filter command and repaiied for offsetting the first noise of earphone internal noise
Positive signal, the audio sound signal and the first noise correction signal that horn single body playing audio signal source is sent, at this point, earphone exists
Normal work stage.For earphone in normal work, the voice signal that feedback filter input feedback microphones, foundation is from calibration
The first filter command that stage obtains is filtered.Since the first filter command is according to the first voice signal and calibration sound
It obtaining, by calibrate sound as reference, can determine the internal noise in the first voice signal, and generating and internal noise pair
The filter command answered, when to work normally, according to the filter command that calibration phase determines, to the sound of feedback microphones acquisition
Signal is handled, the active noise reducing device, is no longer simple to internal noise progress and identical reverse phase processing, but with mark
Calibration signal is reference, can improve the accuracy of internal noise identification, and then improve the noise reduction of earphone.
In another embodiment, as shown in figure 4, further include connect with audio signal source 360, with control circuit signal
The compensating filter 390 of 330 connections.Control circuit 380 is according to the first filter command, to second filter of the output of compensating filter 390
Wave instructs.
In actual application, because feedback filter is modified (phse conversion) noise according to the first filter command
When, if certain frequency ranges of the audio played are identical as the frequency range of noise, while feedback filter changes noise phase
Inevitably the phase of source sound can be changed, this is the destruction to sound source sound quality in fact.In this regard, in the present embodiment
Provided with compensating filter 390.The input terminal of compensating filter 390 is connect with audio signal source 360.330 basis of control circuit
First filter command generates the second filter command.I.e. the second filter command is related to the first filter command, is specifically as follows correspondence
The filter factor of frequency range is made compensation to the corresponding frequency band of the audio signal of broadcasting by compensating filter, is filtered with Compensation Feedback
Device is damaged caused by sound source sound.
Above-mentioned active noise reducing device utilizes compensation filter on the basis of carrying out noise reduction process using feedback filter
Device compensates the audio of broadcasting, is damaged caused by sound source sound with Compensation Feedback filter, and noise reduction while ensures sound
Sound is lossless.
In another embodiment, a kind of active noise reducing device is provided, as shown in figure 5, including：Audio main body 410, feedback
Filter 420, control circuit 430, first switch 440, second switch 450, third switch 480, the 4th switch 411, feedforward filter
Wave device 410 and compensating filter 490.
Wherein, audio main body includes feedforward microphone 4103, horn single body 4102 and feedback microphones 4101, first switch
440 movable contact is connect with feedback microphones 4101, and the first stationary contact of first switch 440 is connect with feedback filter 420, the
Two stationary contacts are connect with control circuit 430.The movable contact of second switch 450 is connect with horn single body 4102, second switch 450
First stationary contact is connect with audio signal source 460, and the second stationary contact is connect with calibration signal source 470.The setting of third switch 480 exists
Between calibration signal source 370 and control circuit 330.Compensating filter 490 is connect with audio signal source 490, is specifically arranged
Between audio signal source 490 and second switch 450.Feedforward filter 410 and the 4th switch 411 connect with feedforward microphone 4103
It connects.First switch 440, second switch 450, third switch 480, the 4th switch 411, feedback filter 420 and feedforward filtering
Device 410 is connect with 430 signal of control circuit.
Control circuit 430 responds calibration command, is opened to first switch 440, second switch 450, third switch 480 and the 4th
It closes 411 and sends the first switching command；The movable contact and the second stationary contact for controlling first switch 440 are connected, and second switch 450 moves
Contact is connected with the second stationary contact, and third switch 480 is closed, and the 4th switch 411 disconnects, at this point, earphone is in calibration phase.
The calibration voice signal and feedback microphones that control circuit 430 is exported according to calibration signal source are in horn single body 4102
The first voice signal acquired when calibration voice signal is played, the first filter command is exported to feedback filter 420.
Control circuit 330 also sends the to first switch 440, second switch 450, third switch 480 and the 4th switch 411
Two switching commands, the movable contact and the first stationary contact for controlling first switch 440 are connected, the movable contact of second switch 450 and first
Stationary contact is connected, and third switch 480 disconnects, and the 4th switch 411 is closed, at this point, earphone is in normal work stage.
Specifically, feedback microphones 4101 are arranged in audio main body 410, the signal receiving end court of feedback microphones 4101
To the pronunciation part of audio main body, the internal noise inside audio main body can be received.Horn single body is arranged in audio main body, uses
In playing voice signal, including the calibration sound that sends out of the internal noise of earphone, calibration signal source and audio signal source are sent out
Useful sound etc..Feedforward microphone 4103 is arranged on the shell of earphone, and signal receiving end feedovers towards the outside of shell
Microphone 4103 farther out, determines that feedforward microphone can just receive the environment of hull outside at a distance from horn single body 4102
Noise.
Control circuit 430 includes being integrated with the control chip of control program, and control chip has corresponding pin, with feedback
Filter 420, feedforward filter 490, first switch 440, second switch 450, third pass open 480 and the 4th switch 411 pass through
Respective pin connects.
First switch 440 can be single-pole double-throw switch (SPDT), and movable contact is connect with feedback microphones 4101, the first stationary contact
Point is connect with feedback filter 420, and the second stationary contact is connect with control circuit 430.When the movable contact of first switch 440 and
When two stationary contacts are connected, feedback microphones 4101 are connected with control circuit 430.When the movable contact of first switch 440 and second quiet
When contacting, feedback microphones 4101 are connected with control circuit 430.
Second switch 450 can be single-pole double-throw switch (SPDT).The movable contact of second switch 450 is connect with horn single body 4102,
First stationary contact of second switch 450 is connect with audio signal source 460, and the second stationary contact is connect with calibration signal source 470.When
When the movable contact of two switches 450 and the second stationary contact are connected, horn single body 4102 is connected with calibration signal source, passes through horn single body
4102 play the calibration sound of calibration signal source.When the movable contact of second switch and the first stationary contact are connected, horn single body
4102 connect with audio signal source, by the audio sound in 4102 playing audio signal source of horn single body, i.e., useful sound.
Specifically, calibration signal source is for sending calibration sound.It is simply melodious to calibrate sound, the typical frequency range of frequency range covering,
It such as include the standard voice of the frequency ranges such as 32Hz, 63Hz, 125Hz, 250Hz, 500Hz and 1KHz.Calibration signal source can be earphone
Internal memory, calibration sound are storable in memory, and memory may be provided inside earphone, for example, In-Ear Headphones
Control unit.Calibration signal source can also be the terminal being connect with earphone 101.Calibration sound is stored in the memory of terminal.
Third switch 480 is arranged between calibration signal source 470 and control circuit 430.When third switch 480 is closed,
Calibration signal source 470 is connected with control circuit 430.Control circuit receives the calibration voice signal of calibration signal source.
4th switch 411 is connect with feedforward filter 410.When the 4th switch 411 is closed, feedforward filter 190 works,
Feedforward filter 410 carries out reverse phase to the external noise information that feedforward microphone 4103 acquires and handles to obtain the second noise correction letter
Number.The inversion signal of the external noise of the generation of feedforward filter 490 is played by horn single body.
Specifically the course of work is as follows：
1, control circuit receives calibration command.
Calibration command is the signal for starting calibration sent to control circuit.Calibration command can be led to by headset user
Terminal 102 is crossed to send to control circuit.For example, terminal operating has earphone to control application program, when user is in new environment,
By being triggered in terminal operation, the control circuit into earphone 101 sends calibration command, starts headphone calibration.Calibration command is also
It can be sent from headset user to control circuit by operating earphone.Specifically, earphone is provided with calibration switch.When user opens
When calibration switch, control circuit receives calibration command.
2, calibration command is responded, is sent to first switch 440, second switch 450, third switch 480 and the 4th switch 411
First switching command.First switch 440 is connected according to the first switching command, movable contact and the second stationary contact, makes feedback Mike
Wind 4101 and control circuit 430 are connected.Second switch 450 is connected according to the second switching command, movable contact and the second stationary contact,
So that horn single body 4102 is connected with calibration signal source, the calibration sound of calibration signal source is played by horn single body 4102.Feedback
Microphone 4101 acquires the first voice signal, control circuit 430 and feedback Mike when horn single body plays calibration voice signal
Wind connects, and obtains the first voice signal.First voice signal includes internal noise signal and calibration voice signal.Third switchs
480 are closed according to the first switching command, and calibration signal source is made to be connected with control circuit, and control circuit 430 obtains calibration sound letter
Number.4th switch 411 is disconnected according to the first switching command, and feedforward filter does not work.At this point, earphone enters calibration mode.
3, control circuit conveys the first filter command to feedback filter according to calibration voice signal and the first voice signal,
The second filter command is conveyed to compensating filter according to the first filter command.
The internal noise of earphone is not constant, and it is related to wear the mode of earphone with residing environment and user.Work as ring
When border noise is big, the internal noise of earphone increases therewith.By taking In-Ear Headphones as an example, if earphone is not complete because of wearing mode mistake
Complete is placed on ear intracavitary, then the noise entered inside earphone increases therewith.That is, the internal noise of earphone may be because wearing
The variation of mode or local environment and change.When user is in different noise circumstances or wearing mode changes, ear can be passed through
Calibration switch or terminal the triggering calibration of machine.
First voice signal includes calibration voice signal and internal noise signal, by being joined on the basis of calibrating voice signal
According to, compare the first voice signal and calibration voice signal, generate the first filter command, the first filter command for adjust feedback filter
The output of wave device.In the present embodiment, the output of feedback filter is no longer the fixation of the voice signal acquired to feedback microphones
Phase adjustment (such as 180 degree reverse phase), but the reference on the basis of calibrating sound compare the first voice signal and calibration sound letter
Number, generate the first filter command.First filter command includes filter factor, so that feedback filter is adjusted according to filter factor and inputs
Voice signal phase, generate the first noise correction signal for offsetting internal noise, as much as possible reduction calibration sound
Signal plays the effect for earphone internal noise of forgoing.
In actual application, because feedback filter is modified (phse conversion) noise according to the first filter command
When, if certain frequency ranges of the audio played are identical as the frequency range of noise, while feedback filter changes noise phase
Inevitably the phase of source sound can be changed, this is the destruction to sound source sound quality in fact.In this regard, in the present embodiment
Provided with compensating filter.The input terminal of compensating filter is connect with audio signal source.Control circuit according to the first filter command,
Generate the second filter command.I.e. the second filter command is related to the first filter command, is specifically as follows the filtering system of corresponding frequency band
Number, makes compensation, with Compensation Feedback filter to sound source sound by compensating filter to the corresponding frequency band of the audio signal of broadcasting
Caused by damage.
4, after the completion of calibrating, control circuit is switched to first switch 440, second switch 450, third switch 480 and the 4th
411 send the second switching command.First switch 440 is connected according to the second switching command, movable contact and the first stationary contact, is made anti-
Microphone 4101 is presented to be connected with feedback filter 420.Second switch 450 is according to switching command, movable contact and the first stationary contact
It connects, horn single body 4102 is made to be connected with audio signal source 470, the audio sound signal of audio signal source 470 passes through loudspeaker list
Body 4102 plays.Third switch 480 disconnects, and control circuit stops receiving calibration sound.4th switch 411 is closed, feedforward filtering
Device 410 works, and carrying out reverse phase to the external noise information of feedforward microphone acquisition handles to obtain the second noise correction signal.This
When, earphone enters normal mode of operation.
By taking earphone plays music as an example, in one embodiment, the music in 4101 playing audio signal source of feedback microphones, instead
The music in feedback microphone acquisition horn single body playing audio signal source 460 obtains second sound signal.Second sound signal includes
The internal noise and part music of earphone.Feedback microphones 4101 are according to the filter factor in the first filter command, to second
Voice signal is filtered, and generates the first noise correction signal.First noise correction signal is for offsetting rising tone message
Number.Compensation filter filter scolding 490 receives the voice signal of audio signal source, and the second filter command determined according to calibration phase is to defeated
The voice signal entered compensates.Feedforward filter 4103 acquire extraneous environmental noise, and to the extraneous environmental noise of acquisition into
The processing of row reverse phase, the external noise information progress reverse phase that feedforward filter acquire feedforward microphone, which handles to obtain the second noise, repaiies
Positive signal, for offsetting outside noise signal.
As shown in figure 5, active noise reducing device further includes computing circuit 412, the input terminal and feedback filtering of computing circuit 412
Device 420, the movable contact of second switch 450 and feedforward filter 410 connect, and output end and the horn single body of computing circuit connect
It connects.In earphone normal work stage, computing circuit 412 is to feedback filter 420, feedforward filter 410 and compensating filter 490
Signal carry out operation, and played by horn single body.Specifically, computing circuit includes adder.Rank is worked normally in earphone
Section, the sound of audio signal source, the feedforward filter 410 of the compensation that compensating filter 490 exports export to internal noise
First noise correction signal and the second noise correction signal of feedforward filter output come together in adder, and adder plays
Effect to signal plus phase.Adder is connect with horn single body, and horn single body is reduced to the electric signal broadcasting that adder exports
Voice signal.
In one embodiment, control circuit includes detection circuit and controller.The input terminal of detection circuit is opened with third
It closes and the connection of the second stationary contact of first switch, the output end of detection circuit and the input terminal of controller connects, controller
Output end is connected with feedback filter, first switch, second switch and third switch.
Detection circuit detects the internal noise of each frequency range according to calibration voice signal and the first voice signal, and controller is based on
The internal noise of each frequency range exports the first filter command to feedback filter.
Specifically, detection circuit is connect with calibration signal source and feedback filter.Detection circuit is for frequency-division section to calibration
Voice signal and the first voice signal are compared, and controller determines the corresponding subfilter of each frequency range according to comparing result
Filter factor generates the first filter command according to the filter factor of each frequency range, the first filter command is sent to feedback filter.
Feedback filter includes the corresponding subfilter of each frequency range.
Specifically, detection circuit can be divided into multiple frequency ranges, such as 32Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1KHz etc..
Detection circuit is compared and is analyzed to calibration signal source and the first voice signal frequency-division section.Feedback filter includes each frequency range pair
The subfilter answered, each subfilter lay particular emphasis on the voice signal handled within the scope of a certain frequency values.By believing calibration
Number source and the first voice signal compare and analyze, and determine the frequency range where internal noise.For where determining internal noise
Frequency range, determine the filter factor of the corresponding subfilter of each frequency range, make voice signal and the calibration of the output of subfilter
Voice signal approaches.The first filter command is generated according to the filter factor of each wave band, each subfilter is according to corresponding filtering
Number is handled, and each subfilter is finally fitted to a response curve.
Above-mentioned active noise reducing device offsets internal noise using feedback filter, is offset using feedforward filter external
Noise is compensated the audio of broadcasting using compensating filter, is damaged caused by sound source sound with Compensation Feedback filter.
Under the collective effect of compensating filter, feedforward filter and feedback filter, the noise reduction capability of earphone is substantially increased.
In one embodiment, a kind of noise cancelling headphone is also provided, earphone can be headphone or In-Ear Headphones, be somebody's turn to do
Earphone includes above-mentioned active noise reducing device.Audio signal source can be the terminal with sound output function being connect with earphone
Equipment, such as mobile phone, tablet computer etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of active denoising method, which is characterized in that including：
Receive calibration command；
Calibration command is responded, the first switching command is sent；First switching command is for making calibration signal source send calibration sound
Sound signal makes horn single body play the calibration voice signal；
The calibration voice signal and feedback microphones for obtaining calibration signal source output play the calibration in the horn single body
The first voice signal acquired when voice signal；
The first filter command is exported to feedback filter according to the calibration voice signal and first voice signal；
The second switching command is sent, second switching command is for making the feedback filter according to first filter command
The first noise correction signal for offsetting earphone internal noise is generated, horn single body playing audio signal source is made to send
Audio sound signal and the first noise correction signal.
2. according to the method described in claim 1, it is characterized in that, the method further includes：
According to first filter command, the second filter command is exported to compensating filter；Second filter command is for referring to
Show that the compensating filter compensates the audio sound signal that audio signal source exports.
3. according to the method described in claim 1, it is characterized in that, second switching command, is additionally operable to that horn single body is made to broadcast
Put the second noise correction signal that feedforward microphone is handled；The second noise correction signal is by feedforward filter to feedforward
The external noise information of microphone acquisition carries out reverse phase and handles to obtain.
4. a kind of active noise reducing device, which is characterized in that including：
Control circuit, feedback filter and it is provided with feedback microphones and the audio main body of horn single body；
First switch, the movable contact of the first switch are connect with the feedback microphones, the first stationary contact and feedback filter
Connection, the second stationary contact are connect with control circuit；
Second switch, the movable contact of the second switch are connect with the horn single body, and the first stationary contact connects with audio signal source
It connects, the second stationary contact is connect with calibration signal source；
Third switchs, and the third switch is arranged between calibration signal source and control circuit；
The first switch, the second switch, third switch and the feedback filter, connect with the control circuit signal
It connects；
The control circuit responds calibration command, and sending first to the first switch, the second switch and third switch cuts
Change instruction；The movable contact and the second stationary contact for controlling first switch are connected, the movable contact of the second switch and the second stationary contact
It connects and third switch is closed；
The calibration voice signal and feedback microphones that the control circuit is exported according to calibration signal source are broadcast in the horn single body
The first voice signal acquired when the calibration voice signal is put, the first filter command is exported to the feedback filter；
The control circuit also switchs to the first switch, second switch and third and sends the second switching command, described in control
The movable contact of first switch and the first stationary contact are connected, and the movable contact of the second switch and the first stationary contact are connected, Yi Jisuo
Third switch is stated to disconnect.
5. active noise reducing device according to claim 4, which is characterized in that further include connect with the audio signal source,
The compensating filter being connect with the control circuit signal；The control circuit is according to first filter command, to the benefit
It repays filter and exports the second filter command.
6. active noise reducing device according to claim 4, which is characterized in that the audio main body is additionally provided with feedforward Mike
Wind；The active noise reducing device includes that feedforward filter and the 4th switch are connect with the feedforward microphone；4th switch
It being connect with the control circuit signal, control circuit control the 4th switch is closed according to second switching command,
The feedforward filter carries out reverse phase to the external noise information that feedforward microphone acquires and handles to obtain the second noise correction signal.
7. active noise reducing device according to claim 6, which is characterized in that further include computing circuit；
The input terminal of the computing circuit connects with the feedback filter, the movable contact of second switch and the feedforward filter
It connects, the output end of the computing circuit is connect with the horn single body.
8. active noise reducing device according to claim 7, which is characterized in that the computing circuit includes adder.
9. active noise reducing device according to claim 6, which is characterized in that the control circuit includes detection circuit and control
Device processed；The input terminal of the detection circuit is switched with the third and the second stationary contact of the first switch is connect；It is described
The output end of detection circuit is connect with the input terminal of the controller；The output end of the controller and the feedback filter,
The first switch, second switch and third switch connection；
The detection circuit detects the internal noise of each frequency range, the control according to the calibration voice signal and the first voice signal
Internal noise of the device processed based on each frequency range exports the first filter command to the feedback filter.
10. a kind of noise cancelling headphone, which is characterized in that including such as claim 4 to 9 any one of them active noise reducing device.
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| CN201810136380.XA CN108419162A (en) | 2018-02-09 | 2018-02-09 | Active denoising method, active noise reducing device and noise cancelling headphone |
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| CN109151643A (en) * | 2018-09-07 | 2019-01-04 | 歌尔科技有限公司 | Earphone and headphone unit |
| CN109511044A (en) * | 2019-01-07 | 2019-03-22 | 哈尔滨工业大学（深圳） | Mixed structure active noise reduction earphone, noise-reduction method and storage medium |
| CN111081214A (en) * | 2019-12-12 | 2020-04-28 | 西安讯飞超脑信息科技有限公司 | Active noise reduction method and optimization method of feedback filter of active noise reduction device |
| CN111212351A (en) * | 2020-02-28 | 2020-05-29 | 邝建红 | Self-calibration self-adaptive device and system for active noise reduction earphone |
| WO2020199432A1 (en) * | 2019-04-03 | 2020-10-08 | 歌尔股份有限公司 | Feedback noise reduction method and system, and earphone |
| CN112040357A (en) * | 2020-05-09 | 2020-12-04 | 珠海市杰理科技股份有限公司 | True wireless earphone and active noise reduction training circuit, chip and system thereof |
| CN112822593A (en) * | 2021-01-04 | 2021-05-18 | 泰凌微电子(上海)股份有限公司 | Adaptive noise reduction control method, adaptive noise reduction control device and earphone |
| CN115134710A (en) * | 2021-03-26 | 2022-09-30 | Oppo广东移动通信有限公司 | Noise reduction method and device for audio playing equipment, electronic equipment and storage medium |
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| CN109151643A (en) * | 2018-09-07 | 2019-01-04 | 歌尔科技有限公司 | Earphone and headphone unit |
| CN109511044A (en) * | 2019-01-07 | 2019-03-22 | 哈尔滨工业大学（深圳） | Mixed structure active noise reduction earphone, noise-reduction method and storage medium |
| WO2020199432A1 (en) * | 2019-04-03 | 2020-10-08 | 歌尔股份有限公司 | Feedback noise reduction method and system, and earphone |
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| CN111081214A (en) * | 2019-12-12 | 2020-04-28 | 西安讯飞超脑信息科技有限公司 | Active noise reduction method and optimization method of feedback filter of active noise reduction device |
| CN111081214B (en) * | 2019-12-12 | 2022-08-16 | 西安讯飞超脑信息科技有限公司 | Active noise reduction method and optimization method of feedback filter of active noise reduction device |
| CN111212351A (en) * | 2020-02-28 | 2020-05-29 | 邝建红 | Self-calibration self-adaptive device and system for active noise reduction earphone |
| CN112040357A (en) * | 2020-05-09 | 2020-12-04 | 珠海市杰理科技股份有限公司 | True wireless earphone and active noise reduction training circuit, chip and system thereof |
| CN112822593A (en) * | 2021-01-04 | 2021-05-18 | 泰凌微电子(上海)股份有限公司 | Adaptive noise reduction control method, adaptive noise reduction control device and earphone |
| CN112822593B (en) * | 2021-01-04 | 2023-03-31 | 泰凌微电子(上海)股份有限公司 | Adaptive noise reduction control method, adaptive noise reduction control device and earphone |
| CN115134710A (en) * | 2021-03-26 | 2022-09-30 | Oppo广东移动通信有限公司 | Noise reduction method and device for audio playing equipment, electronic equipment and storage medium |
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Address after: 35th floor, block a, Tanglang City, 3333 Liuxian Avenue, Nanshan District, Shenzhen, Guangdong 518000 Applicant after: Wanmo acoustics Co.,Ltd. Address before: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Applicant before: 1MORE Inc. |