CN106792315A - A kind of method and apparatus and a kind of active noise reduction earphone for offsetting ambient noise - Google Patents
A kind of method and apparatus and a kind of active noise reduction earphone for offsetting ambient noise Download PDFInfo
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- CN106792315A CN106792315A CN201710007663.XA CN201710007663A CN106792315A CN 106792315 A CN106792315 A CN 106792315A CN 201710007663 A CN201710007663 A CN 201710007663A CN 106792315 A CN106792315 A CN 106792315A
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Classifications
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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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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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Abstract
The invention discloses a kind of method and apparatus and a kind of active noise reduction earphone for offsetting ambient noise, the device includes microphone, dsp chip, active noise reduction controller, loudspeaker；Microphone is used as feed forward noise reduction microphone and ambient noise monitor microphone, Real-time Collection ambient noise；Dsp chip selects the noise reduction mode most matched with current environment periodically according to microphone in the ambient noise of collection, and corresponding noise reduction parameters are sent into active noise reduction controller；The noise reduction parameters that active noise reduction controller sends according to dsp chip carry out feedforward filtering noise reduction, export the waveform for offsetting ambient noise, loudspeaker plays corresponding voice signal according to the waveform, offset the ambient noise at human ear, so as to reach noise reduction optimal under the present circumstances, realize the switching that noise reduction mode is carried out for different noise circumstance self adaptations, it is ensured that best noise reduction experience can be provided under a variety of environment.
Description
Technical field
The present invention relates to active noise reduction techniques field, and in particular to a kind of method and apparatus and one kind of counteracting ambient noise
Active noise reduction earphone.
Background technology
Long-term work under high-noise environment can have a strong impact on the physical and mental health of practitioner, particularly for there is communication need
Need to wear intelligibility of the noise cancelling headphone to lift called communication under the scene wanted, want to enjoy sound during long-time journey
Happy loosening is also required to the interference that noise cancelling headphone is just avoided that ambient noise.
Existing active noise reduction earphone is mainly the noise reduction schemes of fixed filters, and the noise that can only be fixed frequency range is supported
Disappear, noise reduction is more satisfactory under some specific environments, but noise reduction will give a discount after noise circumstance changes.Also have
Some noise reduction schemes design the filter parameter of several pink noise environment, are realized by way of manual switching button,
Many users do not switch the custom of noise reduction scene in practical application, and are easy to maloperation yet and are switched to other scenes
Go, cause noise cancellation not thorough.
The content of the invention
It is existing to solve the invention provides a kind of method and apparatus and a kind of active noise reduction earphone for offsetting ambient noise
Noise reduction schemes the problem of good noise reduction can not be reached in each species diversity noise circumstance.
According to an aspect of the present invention, the invention provides a kind of device for offsetting ambient noise, including microphone,
Dsp chip, active noise reduction controller, loudspeaker；The dsp chip internal memory contains some default noise reduction modes and its corresponding
Noise reduction parameters；
The microphone, for the ambient noise at Real-time Collection human ear；
The dsp chip, for ambient noise periodically according to the microphone collection in preset duration, from depositing
The noise reduction mode most matched with current environment is selected in some default noise reduction mode of storage, the noise reduction mode pair that will be selected
The noise reduction parameters answered are sent to the active noise reduction controller；
The active noise reduction controller, for the noise reduction parameters sent according to the dsp chip, exports for offsetting environment
The waveform of noise；
The loudspeaker, the waveform for being exported according to the active noise reduction controller plays corresponding voice signal, supports
Ambient noise at the human ear that disappears.
According to another aspect of the present invention, the invention provides a kind of active noise reduction earphone, including above-mentioned counteracting ring
The device of border noise, the microphone in the device of the counteracting ambient noise be arranged on human ear and the earphone loudspeaker it
Between.
According to a further aspect of the invention, the invention provides a kind of method for offsetting ambient noise, including：
Some noise reduction modes are set previously according to different noise scenarios, and sets the corresponding noise reduction ginseng of every kind of noise reduction mode
Number, stores some noise reduction modes and its corresponding noise reduction parameters；
The collection for periodically carrying out in a preset duration to the ambient noise at human ear, ambient noise according to collection is from depositing
The noise reduction mode most matched with current environment is selected in the noise reduction mode of storage；
The noise reduction parameters corresponding with the noise reduction mode that current environment is most matched according to selecting, export corresponding ripple
Shape, and corresponding voice signal is played according to the waveform using loudspeaker, it is used to offset the ambient noise at human ear.
The beneficial effects of the invention are as follows：The embodiment of the present invention sets a microphone at human ear, used as feed forward noise reduction Mike
Wind and ambient noise monitor microphone, the ambient noise at Real-time Collection human ear；Dsp chip is periodically gathered according to microphone
Ambient noise, corresponding noise reduction parameters are sent to active noise reduction control by the noise reduction mode that is most matched with current environment of selection
Device, feedforward filtering noise reduction is carried out by active noise reduction controller, the waveform for offsetting ambient noise is exported, finally by loudspeaker
The ambient noise at voice signal counteracting human ear is played, to reach noise reduction optimal under the present circumstances, it is achieved thereby that
The switching of noise reduction mode is carried out for different noise circumstance self adaptations, it is ensured that under a variety of environment can for user with
Carry out best noise reduction experience.
Brief description of the drawings
Fig. 1 is a kind of functional block diagram of the device of counteracting ambient noise that one embodiment of the invention is provided；
Fig. 2 is a kind of principle of noise reduction figure of the device of counteracting ambient noise that one embodiment of the invention is provided；
Fig. 3 is the schematic diagram of the bass boost controller in one embodiment of the invention；
Fig. 4 is a kind of functional block diagram of active noise reduction earphone that one embodiment of the invention is provided；
Fig. 5 is a kind of flow chart of the method for counteracting ambient noise that one embodiment of the invention is provided.
Specific embodiment
Design concept of the invention is：Existing active noise reduction scheme is mainly the noise reduction schemes of fixed filters, can only
It is fixed the noise cancellation of frequency range, or designs the parameter of several pink noise environment, by way of manual switching button
To realize, operation is not easy to, Consumer's Experience is not good.For such case, the present invention sets a microphone at human ear, used as preceding
Feedback noise reduction microphone and ambient noise monitor microphone, the ambient noise at Real-time Collection human ear；Dsp chip periodically basis
Corresponding noise reduction parameters are sent to master by the ambient noise of microphone collection, the noise reduction mode that selection is most matched with current environment
Dynamic noise reduction controller, feedforward filtering noise reduction is carried out by active noise reduction controller, exports the waveform for offsetting ambient noise, finally
Ambient noise at voice signal counteracting human ear is played by loudspeaker, to reach noise reduction optimal under the present circumstances,
It is achieved thereby that carrying out the switching of noise reduction mode for different noise circumstance self adaptations, it is ensured that can under a variety of environment
Enough for user brings best noise reduction to experience.
Embodiment one
Fig. 1 is a kind of functional block diagram of the device of counteracting ambient noise that one embodiment of the invention is provided, such as Fig. 1 institutes
Show, the device of the counteracting ambient noise that the present embodiment is provided includes microphone 110, dsp chip 120, active noise reduction controller 130
With loudspeaker 140, dsp chip internal memory contains some default noise reduction modes and its corresponding noise reduction parameters.
Ambient noise at the Real-time Collection human ear of microphone 110, the present embodiment using only a microphone, while as preceding
Feedback noise reduction microphone and ambient noise monitor microphone.Dsp chip 120 is periodically according to microphone 110 in preset duration
The ambient noise of collection, selects the noise reduction mode most matched with current environment from some default noise reduction mode of storage,
The corresponding noise reduction parameters of noise reduction mode that will be selected are sent to active noise reduction controller 130.Active noise reduction controller 130 is used for
Feedforward filtering noise reduction is carried out, according to the noise reduction parameters that dsp chip 120 sends, the waveform for offsetting ambient noise is exported.Raise one's voice
The waveform that device 140 is exported according to active noise reduction controller 130 plays corresponding voice signal, offsets the ambient noise at human ear.
Preferably, the device of the counteracting ambient noise that the present embodiment is provided also includes bass boost controller 150, for changing
Become the low frequency width responsiveness and phase response characteristic of loudspeaker 140, the device of the counteracting ambient noise is more suitable for some spies
Noise measarement in the case of fixed.Low frequency amplitude response and phase response characteristic based on loudspeaker 140, also deposit in dsp chip 120
The bass boost parameter of the every kind of default noise reduction mode of correspondence is contained, bass boost controller 150 is selected according to dsp chip 120
The corresponding bass boost parameter of the noise reduction mode for most matching, to active noise reduction controller 130 output waveform low frequency amplitude
Response and phase response characteristic are exported to loudspeaker 140 after being adjusted.Fig. 2 is the device of the counteracting ambient noise of the present embodiment
Principle of noise reduction figure, P (s) be main channel transfer function；H (s) is active noise reduction controller；G (s) is that secondary channel transmits letter
Number, G (s) is the combination of bass boost controller and loudspeaker in the present embodiment.
The effect of bass boost controller 150 is the amplitude response and phase response characteristic for adjusting loudspeaker, is generally raised one's voice
Device low frequency part amplitude decays downwards, while phase increases quickly upwards, easily causes whole active noise reduction system beyond cause and effect
Property control condition.Bass boost controller 150 is to realize that phase drops at low frequency by controlling circuit zero pole point, is raised for balancing
Sound device phase physically rises.First some pink noise environment were measured before design bass boost controller 150
And power spectrum characteristic is analyzed, carry out bass boost design for the strong noise power spectrum of low frequency energy.Fig. 3 particularly illustrates bass
Enhancing controller 150 in 3 different bass boost parameters of application, amplitude response and phase response characteristic to loudspeaker and
The influence of system zero pole point.When bass boost parameter is zero, decay is very fast and phase is upward downwards for speakers low frequencies amplitude
Increase very fast, when bass boost parameter increases, can be declined with active balance loudspeaker low frequency physically and phase rises, prevent
Locking system exceeds causality control condition, and the stability of strengthening system improves noise reduction.
The device of the counteracting ambient noise of the present embodiment after electrifying startup, active noise reduction controller 130 and bass boost
Controller 150 applies default default parameters, the ambient noise of the monitoring collection of microphone 110 of dsp chip 120, dsp chip 120
It is default with all by periodically analyzing the noise spectrum signature of the ambient noise that microphone 110 is collected in preset duration
The noise spectrum signature of noise reduction mode is contrasted, and selects immediate noise reduction mode as the noise reduction mould most matched with current environment
Formula, then dsp chip 120 the corresponding noise reduction parameters of this kind of noise reduction mode and bass boost parameter are sent respectively to active noise reduction
Controller 130 and bass boost controller 150, to reach noise reduction optimal under the present circumstances, it is achieved thereby that being directed to
Different noise circumstance self adaptations carry out the switching of noise reduction mode, it is ensured that can bring best drop for user under circumstances
Make an uproar experience.
Also in advance to every kind of default noise reduction mode, adjustment noise reduction parameters offset ambient noise to the present embodiment to adjust user
Waveform and adjustment bass boost parameter to adjust loudspeaker to the response of the low frequency amplitude of the waveform and phase response characteristic,
Until the ambient noise at the human ear for collecting is less than preset value；The corresponding noise spectrum signature of this kind of noise reduction mode is recorded, and will
Noise reduction parameters now and bass boost parameter are stored as the corresponding noise reduction parameters of this kind of noise reduction mode and bass boost parameter
To in dsp chip 120.
Embodiment two
Fig. 4 is a kind of functional block diagram of active noise reduction earphone that one embodiment of the invention is provided, as shown in figure 4, this reality
Applying the active noise reduction earphone 400 of example offer includes the device 410 of the counteracting ambient noise in above-described embodiment one, offsets environment and makes an uproar
Microphone in the device 410 of sound is arranged between human ear and the loudspeaker of earphone.Microphone as feed forward noise reduction microphone and
Ambient noise monitor microphone, the ambient noise at Real-time Collection human ear offsets the dsp chip in the device 410 of ambient noise
Periodically selected from some noise reduction modes of storage with current environment most in the ambient noise of collection according to microphone
Corresponding noise reduction parameters and bass boost parameter are sent respectively to active noise reduction controller and bass boost by the noise reduction mode matched somebody with somebody
Controller, the noise reduction parameters that active noise reduction controller sends according to dsp chip carry out feedforward filtering noise reduction, bass boost controller
The amplitude response and phase response characteristic of the bass boost parameter adjustment loudspeaker sent according to dsp chip, last loudspeaker root
According to the waveform through active noise reduction controller and the treatment output of bass boost controller, corresponding voice signal is played, offset human ear
The ambient noise at place, it is achieved thereby that carrying out the switching of noise reduction mode for different noise circumstance self adaptations, it is ensured that in various rings
Best noise reduction experience can be provided under border.
Embodiment three
Fig. 5 is a kind of flow chart of the method for counteracting ambient noise that one embodiment of the invention is provided, as shown in figure 5,
The method of the counteracting ambient noise that the present embodiment is provided includes：
Step S510：Some noise reduction modes are set previously according to different noise scenarios, and sets every kind of noise reduction mode pair
The noise reduction parameters answered, store every kind of noise reduction mode and its corresponding noise reduction parameters.
A preferred embodiment of the present invention adjusts noise reduction parameters to adjust user in advance to every kind of default noise reduction mode
The waveform and adjustment bass boost parameter of ambient noise is offset to adjust loudspeaker to the low frequency amplitude response of the waveform and phase
Position response characteristic, until the ambient noise at the human ear for collecting is less than preset value；Record the corresponding noise of this kind of noise reduction mode
Spectrum signature, and noise reduction parameters now and bass boost parameter are stored as the corresponding noise reduction parameters of this kind of noise reduction mode and bass
Enhancing parameter.
Step S520：The collection in a preset duration is periodically carried out to the ambient noise at human ear, according to the ring of collection
Border noise selects the noise reduction mode most matched with current environment from the noise reduction mode of storage.
Preferably, the noise reduction mode that the present embodiment selects most to be matched with current environment by following steps：Periodically divide
The noise spectrum signature of the ambient noise collected in a preset duration is analysed, all default noise reduction mode stored with step S510
Noise spectrum signature contrasted, minimum noise reduction mode as the noise reduction mode most matched with current environment will be differed.
Step S530：According to the noise reduction parameters corresponding with the noise reduction mode that current environment is most matched selected, phase is exported
The waveform answered, and corresponding voice signal is played according to the waveform using loudspeaker, it is used to offset the ambient noise at human ear.From
And realize the switching that noise reduction mode is carried out for different noise circumstance self adaptations, it is ensured that can provide under circumstances most
Good noise reduction experience.
The method of the counteracting ambient noise that a preferred embodiment of the invention is provided also includes：Low frequency width based on loudspeaker
Degree response and phase response characteristic, the every kind of noise reduction mode setting bass boost parameter of correspondence are simultaneously stored；According to select and work as
The corresponding bass boost parameter of noise reduction mode that preceding environment is most matched, the low frequency amplitude of the waveform to exporting is responded and phase response
Characteristic is exported to loudspeaker after being adjusted, and is suitable for the Noise measarement under varying environment, strengthens the stability of noise reduction system, is entered
One step improves noise reduction.
The above, specific embodiment only of the invention, under above-mentioned teaching of the invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is simply preferably explained in body description, and protection scope of the present invention should be defined by scope of the claims.
Claims (9)
1. it is a kind of offset ambient noise device, it is characterised in that described device include microphone, dsp chip, active noise reduction control
Device processed, loudspeaker；The dsp chip internal memory contains some default noise reduction modes and its corresponding noise reduction parameters；
The microphone, for the ambient noise at Real-time Collection human ear；
The dsp chip, for ambient noise periodically according to the microphone collection in preset duration, from storage
The noise reduction mode most matched with current environment is selected in some default noise reduction modes, the noise reduction mode that will be selected is corresponding
Noise reduction parameters are sent to the active noise reduction controller；
The active noise reduction controller, for the noise reduction parameters sent according to the dsp chip, exports for offsetting ambient noise
Waveform；
The loudspeaker, the waveform for being exported according to the active noise reduction controller plays corresponding voice signal, offsets people
Ambient noise at ear.
2. device as claimed in claim 1, it is characterised in that described device also includes bass boost controller；
Low frequency amplitude response and phase response characteristic based on the loudspeaker, the correspondence that is also stored with the dsp chip are every kind of
The bass boost parameter of default noise reduction mode；
The bass boost controller, the corresponding bass of the noise reduction mode for most matching for being selected according to the dsp chip increases
Strong parameter, low frequency amplitude response and phase response characteristic to the waveform of active noise reduction controller output are adjusted rear defeated
Go out to the loudspeaker.
3. device as claimed in claim 2, it is characterised in that the dsp chip is specifically for when periodically analyzing default
The noise spectrum signature of the ambient noise collected in long, the noise spectrum signature with all default noise reduction modes is contrasted, will
The noise reduction mode of minimum is differed as the noise reduction mode most matched with current environment.
4. device as claimed in claim 3, it is characterised in that the dsp chip is additionally operable to,
In advance to every kind of default noise reduction mode, adjust noise reduction parameters to adjust waveform and tune that user offsets ambient noise
Whole bass boost parameter is responded and phase response characteristic with adjusting loudspeaker to the low frequency amplitude of the waveform, until the people for collecting
Ambient noise at ear is less than preset value；
Record the corresponding noise spectrum signature of this kind of noise reduction mode, and using noise reduction parameters now and bass boost parameter as this kind
The corresponding noise reduction parameters of noise reduction mode and bass boost parameter are stored in the dsp chip.
5. a kind of active noise reduction earphone, it is characterised in that including the counteracting ambient noise as described in claim any one of 1-4
Device, the microphone in the device of the counteracting ambient noise is arranged between the loudspeaker of human ear and the earphone.
6. it is a kind of offset ambient noise method, it is characterised in that methods described includes：
Some noise reduction modes are set previously according to different noise scenarios, and set the corresponding noise reduction parameters of every kind of noise reduction mode,
Store some noise reduction modes and its corresponding noise reduction parameters；
The collection in a preset duration is periodically carried out to the ambient noise at human ear, according to the ambient noise for gathering from storage
The noise reduction mode most matched with current environment is selected in noise reduction mode；
The noise reduction parameters corresponding with the noise reduction mode that current environment is most matched according to selecting, export corresponding waveform,
And corresponding voice signal is played according to the waveform using loudspeaker, it is used to offset the ambient noise at human ear.
7. method as claimed in claim 6, it is characterised in that methods described also includes：
Low frequency amplitude response and phase response characteristic based on the loudspeaker, the every kind of noise reduction mode setting bass boost ginseng of correspondence
Count and store；
According to the bass boost parameter corresponding with the noise reduction mode that current environment is most matched selected, to the low of the waveform that exports
Frequency amplitude response and phase response characteristic are exported to the loudspeaker after being adjusted.
8. method as claimed in claim 7, it is characterised in that the ambient noise according to collection is from default noise reduction mode
In select the noise reduction mode most matched with current environment, specifically include：
The noise spectrum signature of the ambient noise collected in a preset duration is periodically analyzed, with all default noise reduction modes
Noise spectrum signature contrasted, minimum noise reduction mode as the noise reduction mode most matched with current environment will be differed.
9. method as claimed in claim 8, it is characterised in that the corresponding noise reduction parameters of the every kind of noise reduction mode of setting are specific
Including：
In advance to every kind of default noise reduction mode, adjust noise reduction parameters to adjust waveform and tune that user offsets ambient noise
Whole bass boost parameter is responded and phase response characteristic with adjusting loudspeaker to the low frequency amplitude of the waveform, until the people for collecting
Ambient noise at ear is less than preset value；
Record the corresponding noise spectrum signature of this kind of noise reduction mode, and store noise reduction parameters now and bass boost parameter as this
Plant the corresponding noise reduction parameters of noise reduction mode and bass boost parameter.
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| CN201710007663.XA CN106792315B (en) | 2017-01-05 | 2017-01-05 | Method and device for counteracting environmental noise and active noise reduction earphone |
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| CN107750027A (en) * | 2017-11-30 | 2018-03-02 | 会听声学科技（北京）有限公司 | scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method |
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