CN208079335U - Active noise reducing device and noise cancelling headphone - Google Patents
Active noise reducing device and noise cancelling headphone Download PDFInfo
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- CN208079335U CN208079335U CN201820244554.XU CN201820244554U CN208079335U CN 208079335 U CN208079335 U CN 208079335U CN 201820244554 U CN201820244554 U CN 201820244554U CN 208079335 U CN208079335 U CN 208079335U
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Abstract
The utility model is related to a kind of active noise reducing device and noise cancelling headphones, the active noise reducing device, when receiving calibration command, control circuit sends the first switching command, each switch work, calibration signal source sends calibration voice signal, and horn single body plays calibration voice signal, and then control circuit obtains the first voice signal of the transmission that calibration voice signal and feedback microphones are acquired when horn single body plays calibration voice signal.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, control circuit sends the second switching command to each switch, feedback filter generates 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 that horn single body playing audio signal source is sent, at this point, earphone is in normal work stage.The device can improve the accuracy of internal noise identification, and then improve the noise reduction of earphone.
Description
Technical field
The utility model is related to noise reduction technology fields, more particularly to a kind of active noise reducing device and noise cancelling headphone.
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.
Utility model content
Based on this, it is necessary to be directed to the problem of existing earphone noise reduction difference, provide a kind of active noise reducing device and noise reduction
Earphone.
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.
In one embodiment, the audio main body includes shell, and the feedback microphones and the horn single body are located at
In the shell.
In one embodiment, the signal receiving end of the feedback microphones is towards the horn single body.
In one embodiment, the signal receiving end of the feedforward microphone is towards the outside of the shell.
A kind of noise cancelling headphone, including above-mentioned active noise reducing device.
Above-mentioned active noise reducing device and noise cancelling headphone sends the first switching command when receiving calibration command, according to
First voice signal and calibration voice signal export the first filter command to feedback filter.After the completion of calibration, second is sent
Switching command, at this point, earphone is in normal work stage.For earphone in normal work, feedback filter inputs feedback microphones
Voice signal, be filtered according to the first filter command for being obtained from calibration phase.Due to the first filter command according to
First voice signal and calibration sound obtain, by calibrate sound as reference, can determine the inside in the first voice signal
Noise, and filter command corresponding with internal noise is generated, when to work normally, the filtering determined according to calibration phase refers to
It enables, the voice signal of feedback microphones acquisition is handled, the active noise reducing device, is carried out simply to internal noise
And identical reverse phase processing, but using standard signal as reference, the accuracy of internal noise identification can be improved, and then improve ear
The noise reduction of machine.
Description of the drawings
Fig. 1 is the application environment schematic diagram of the active noise reducing device of one embodiment；
Fig. 2 is the connection relationship diagram of the active noise reducing device of one embodiment；
Fig. 3 is the connection relationship diagram of the active noise reducing device of another embodiment；
Fig. 4 is the connection relationship diagram of the active noise reducing device of another embodiment.
Specific implementation mode
Active noise reducing device 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..Active noise reducing device is set in earphone 101.
In one embodiment, as shown in Fig. 2, 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 (horn single body) of audio main body, the internal noise inside audio main body can be received.Horn single body is arranged in sound
In frequency main body, for playing voice signal, including the calibration sound that sends out of the internal noise of earphone, calibration signal source and audio letter
The useful sound etc. that number source is sent out.
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 3, 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 4, 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 4, 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.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. 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.
2. active noise reducing device according to claim 1, 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.
3. active noise reducing device according to claim 1, 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.
4. active noise reducing device according to claim 3, 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.
5. active noise reducing device according to claim 4, which is characterized in that the computing circuit includes adder.
6. active noise reducing device according to claim 1, 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.
7. active noise reducing device according to claim 3, which is characterized in that the audio main body includes shell, described anti-
Feedback microphone and the horn single body are located in the shell.
8. active noise reducing device according to claim 7, which is characterized in that the signal receiving end court of the feedback microphones
To the horn single body.
9. active noise reducing device according to claim 7, which is characterized in that the signal receiving end court of the feedforward microphone
To the outside of the shell.
10. a kind of noise cancelling headphone, which is characterized in that including active noise reducing device as described in any one of claim 1 to 9.
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| CN201820244554.XU CN208079335U (en) | 2018-02-09 | 2018-02-09 | Active noise reducing device and noise cancelling headphone |
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| 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 |
| CN109545181A (en) * | 2018-12-13 | 2019-03-29 | 四川长虹电器股份有限公司 | A kind of adaptive digital active noise reduction framework |
| CN110290442A (en) * | 2019-07-17 | 2019-09-27 | 北京市劳动保护科学研究所 | Active noise reduction earphone and its design method |
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| CN111785240A (en) * | 2020-08-03 | 2020-10-16 | 上海全景医学影像诊断中心有限公司 | Anti-phase interference filter active wave protection device for PET-MR working noise |
| CN111785240B (en) * | 2020-08-03 | 2021-04-09 | 上海全景医学影像诊断中心有限公司 | Anti-phase interference filter active wave protection device for PET-MR working noise |
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