CN108235818A - Active denoising method, equipment and earphone - Google Patents
Active denoising method, equipment and earphone Download PDFInfo
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- CN108235818A CN108235818A CN201880000003.1A CN201880000003A CN108235818A CN 108235818 A CN108235818 A CN 108235818A CN 201880000003 A CN201880000003 A CN 201880000003A CN 108235818 A CN108235818 A CN 108235818A
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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
A kind of active denoising method, the noise in cavity formed for reducing housing and body-coupled, including：Obtain the first noise information in cavity.First noise information is divided into the noise information of the frequency band of at least two non-overlapping copies according to predeterminated frequency section.According to the noise information of the frequency band of non-overlapping copies, adjustment respectively is made an uproar parameter corresponding at least two filters of the noise information of the frequency band of non-overlapping copies.Obtain the second noise information outside cavity.It receives and is made an uproar parameter according at least two filters after adjustment, handle the second noise information, to export the audio data with noise reduction.It is made an uproar parameter by first setting a filter substantially, then parameter of making an uproar when in use to the filter carries out feedback modifiers, it is the blanket a large amount of calculating for filtering parameter of making an uproar of acquisition so as to save early period, can be also directed to different use environments and carry out adaptability amendment, improve and filter adaptability of the parameter to varying environment of making an uproar.
Description
Technical field
The present invention relates to noise reduction technology field, more particularly to a kind of active noise reducing device and earphone and a kind of active
Noise-reduction method.
Background technology
In actual life, for user when wearing earphone, housing and the body-coupled of earphone form cavity.On the one hand, it is extraneous
Noise can be propagated by housing in cavity, and housing has ambient noise certain filtration, with housing shape and
The difference of material also differs the filtration of ambient noise.On the other hand, ambient noise can also by housing and human ear it
Between gap leakage into cavity, with housing and the difference of body-coupled degree, ambient noise leaks into the degree in cavity
Also it differs, the degree of housing and body-coupled is closer, and the noise leaked into cavity is fewer.Therefore, what human ear was heard makes an uproar
Sound is not equal to ambient noise, actually hear to be ambient noise propagated by housing or by gap leakage into the portion in cavity
Divide noise.Therefore it can be pushed away by conditions such as the degree of coupling of ambient noise, the material of housing, the shape of housing, housing and human body
The numerical value for parameter of making an uproar is filtered in export active noise reduction techniques.In traditional technology, obtain the blanket process for filtering parameter of making an uproar and calculate
Numerous and diverse and filter is made an uproar ineffective.
Invention content
Based on this, it is necessary to for filter make an uproar parameter filter make an uproar the problem of ineffective, a kind of master based on feedback adjustment is provided
Dynamic noise-reduction method.
In addition, also provide a kind of active noise reduction equipment and earphone.
A kind of active denoising method, the noise in cavity formed for reducing housing and body-coupled, including：
Obtain the first noise information in cavity.
First noise information is divided into the noise information of the frequency band of at least two non-overlapping copies according to predeterminated frequency section.
According to the noise information of the frequency band of non-overlapping copies, adjustment is corresponding to the noise letter of the frequency band of non-overlapping copies respectively
At least two filters of breath are made an uproar parameter.
Obtain the second noise information outside cavity.
It receives and is made an uproar parameter according at least two filters after adjustment, handle the second noise information, there is noise reduction effect with output
The audio data of fruit.
The first noise information is divided by least two non-overlapping copies according to predeterminated frequency section in one of the embodiments,
The step of noise information of frequency band, including：
First noise information is divided into the noise of at least two non-overlapping copies frequency bands by least two dividing filters
Information.
In one of the embodiments, according to the noise information of the frequency band of non-overlapping copies, adjustment respectively corresponds to mutually not
At least two filters of the noise information of the frequency band of overlapping make an uproar parameter the step of, including：
By connecting the control module of at least two dividing filters come the noise information of the frequency band according to non-overlapping copies
Parameter of making an uproar is filtered in adjustment at least two.
It receives and is made an uproar parameter according at least two filters after adjustment in one of the embodiments, processing the second noise letter
Breath has the step of audio data of noise reduction with output, including：
It is received by least two processing wave filters of link control module and filters parameter corresponding position of making an uproar according at least two
The second noise information is managed, to export the audio data with noise reduction.
The first noise information is divided by least two non-overlapping copies according to predeterminated frequency section in one of the embodiments,
The step of noise information of frequency band, including：
First noise information is separated to the frequency of at least two non-overlapping copies successively according to predeterminated frequency section according to time order and function
The noise information of rate section.
In one of the embodiments, according to the noise information of the frequency band of at least two non-overlapping copies, respectively adjustment pair
Should in parameter is made an uproar at least two filters of the noise information of the frequency band of at least two non-overlapping copies the step of, including：
According to the noise information of the frequency band of at least two non-overlapping copies, it is sequentially adjusted in corresponding to respectively according to time order and function
At least two filters of the noise information of the frequency band of at least two non-overlapping copies are made an uproar parameter.
It receives and is made an uproar parameter according at least two filters after adjustment in one of the embodiments, processing the second noise letter
The step of breath, including：
It receives and is made an uproar parameter according at least two filters after adjustment successively according to time order and function, handle the second noise information.
Before the step of obtaining the first noise information in cavity in one of the embodiments, further include：
Receive the digital audio and video signals that external equipment intermittence generates.
It detects whether to receive digital audio and video signals, when not receiving digital audio and video signals, performs the obtained in cavity
The step of one noise information.When receiving digital audio and video signals, pause performs the step of obtaining the first noise information in cavity.
It detects whether to receive digital audio and video signals in one of the embodiments, when not receiving digital audio and video signals,
Perform the step of obtaining the first noise information in cavity.When receiving digital audio and video signals, pause, which performs, to be obtained in cavity
The step of first noise information, including：
It detects whether to receive the bitstream of digital audio and video signals to judge whether to receive digital audio and video signals.
A kind of active noise reduction equipment, including：
Housing, for forming cavity with body-coupled.
First sensor, for obtaining the first noise information in cavity.
Frequency division module is electrically connected with first sensor, for being divided into the first noise information at least according to predeterminated frequency section
The noise information of the frequency band of two non-overlapping copies.
Control module is connect with frequency division module, for the noise information of the frequency band according at least two non-overlapping copies, is divided
Tiao Zheng make an uproar parameter corresponding at least two filters of the noise information of the frequency band of at least two non-overlapping copies.
Second sensor, for obtaining the second noise information outside cavity.
Audio processing modules are connect respectively with control module, second sensor, for receive and according to after adjustment at least
Two are filtered parameter of making an uproar, and handle the second noise information, to export the audio data with noise reduction.
Frequency division module includes at least two of the frequency band corresponding at least two non-overlapping copies in one of the embodiments,
A dividing filter.
Audio processing modules include at least two processing wave filters of link control module in one of the embodiments,.
Wave filter is handled for handling the second noise information.
Frequency division module is used for the first noise information according to predeterminated frequency section according to time elder generation in one of the embodiments,
Separate the noise information of the frequency band of at least two non-overlapping copies successively afterwards.
Control module is used to be believed according to the noise of the frequency band of at least two non-overlapping copies in one of the embodiments,
Breath is sequentially adjusted in corresponding at least two of the noise information of the frequency band of at least two non-overlapping copies according to time order and function respectively
Filter parameter of making an uproar.
In one of the embodiments, audio processing modules for receive and according to time order and function successively according to adjustment after
At least two filter parameter of making an uproar, and handle the second noise information, to export the audio data with noise reduction.
Further comprise in one of the embodiments, the audio signal input module being connect with control module.Audio is believed
Number input module is used to receive the digital audio and video signals of external equipment intermittence generation.Wherein,
When control module detects that audio signal input module does not receive digital audio and video signals, control module control frequency dividing
Module works.When control module detects that audio signal input module receives digital audio and video signals, control module control
Frequency division module break-off.
Control module further includes bitstream detection unit in one of the embodiments, and bitstream detection unit is used to examine
Whether acoustic frequency signal input module receives the bitstream of digital audio and video signals, to judge whether to receive digital audio letter
Number.
A kind of active noise reduction earphone, including：
Housing, for forming cavity with body-coupled.
First sensor, for obtaining the first noise information in cavity.
Frequency division module is electrically connected with first sensor, for being divided into the first noise information at least according to predeterminated frequency section
The noise information of the frequency band of two non-overlapping copies.
Control module is connect with frequency division module, for the noise information of the frequency band according to non-overlapping copies, respectively adjustment pair
It should make an uproar parameter at least two filters of the noise information of the frequency band of non-overlapping copies.
Second sensor, for obtaining the second noise information outside cavity.
Audio processing modules are connect respectively with control module, second sensor, for receive and according to after adjustment at least
Two are filtered parameter of making an uproar, and handle the second noise information, to export the audio data with noise reduction.
Earphone includes headphone or In-Ear Headphones in one of the embodiments,.
The active denoising method is made an uproar parameter by first setting a filter substantially, parameter of then making an uproar when in use to the filter into
Row feedback modifiers are to obtain the blanket a large amount of calculating for filtering parameter of making an uproar so as to save early period, can also use ring for different
Border carries out adaptability amendment, improves and filters adaptability of the parameter to varying environment of making an uproar.
Description of the drawings
Fig. 1 is the flow chart of active denoising method in an embodiment；
Fig. 2 is the flow chart of active denoising method in an embodiment；
Fig. 3 is the flow chart of active denoising method in an embodiment；
Fig. 4 is the flow chart of active denoising method in an embodiment；
Fig. 5 is the functional block diagram of active noise reduction equipment in an embodiment；
Fig. 6 is the structure diagram of active noise reduction equipment in an embodiment.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In attached drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that make to understand more the disclosure
Add thorough and comprehensive.
As shown in Figure 1, a kind of active denoising method, specifically may comprise steps of：
Step S100：Obtain the first noise information in cavity.
Step S200：First noise information is divided into making an uproar for the frequency band of at least two non-overlapping copies according to predeterminated frequency section
Message ceases.
Step S300：According to the noise information of the frequency band of non-overlapping copies, adjustment is corresponding to the frequency of non-overlapping copies respectively
At least two filters of the noise information of section are made an uproar parameter.
Step S400：Obtain the second noise information outside cavity.
Step S500：It receives and is made an uproar parameter according at least two filters after adjustment, handle the second noise information, to export tool
There is the audio data of noise reduction.
The active denoising method is made an uproar parameter by first setting a filter substantially, parameter of then making an uproar when in use to the filter into
Row feedback modifiers are to obtain the blanket a large amount of calculating for filtering parameter of making an uproar so as to save early period, can also use ring for different
Border carries out adaptability amendment, improves and filters adaptability of the parameter to varying environment of making an uproar.
Step S100：Obtain the first noise information in cavity.
The first noise information in cavity includes frequency, phase, amplitude of noise etc..It can be by setting in the cavity
Feedback microphones obtain the first noise information in cavity.Preferably, feedback microphones can be arranged on generating reverse phase noise
Driver place closer to the distance, the noise in the cavity around driver is received to the full extent, so as to preferably restore
Driver ambient noise information so that the reverse phase noise that driver generates can more accurately offset the noise in cavity.
Step S200：First noise information is divided into making an uproar for the frequency band of at least two non-overlapping copies according to predeterminated frequency section
Message ceases.
Full rate section or a certain frequency band are divided by preset multiple frequency bands by part-frequency point, which does not weigh mutually
It is folded.The setting of part-frequency point is unlimited, and selectivity setting part-frequency point can be distributed according to the frequency band of the second noise information.
In one embodiment, the frequency band centralized arrangement part-frequency point in noise integrated distribution may be selected, in remaining frequency
Arrangement part-frequency point does not arrange part-frequency point even to section less, so as to not only save component, but also do not influence active noise reduction effect.For example,
Using 4KHz, 2KHz, 1KHz, 500Hz as preset part-frequency point, 4KHz-2KHz, 2KHz-1KHz, 1KHz-500Hz can be divided into
Predeterminated frequency section.It is new to set if noise integrated distribution on the frequency band of 4KHz-1KHz, can omit this part-frequency point of 500Hz
Part-frequency point for 4KHz, 2KHz, 1KHz, corresponding new predeterminated frequency section is 4KHz-2KHz, 2KHz-1KHz.In this way, it can save
Dividing filter slightly corresponding with 1KHz-500Hz frequency bands achievees the purpose that save component.
In one embodiment, preset frequency band selection Frequency section, because shell can be very using acoustic material
The medium-high frequency noise of isolated environment, the first noise traveled in the cavity that human ear is formed with earpiece couples are mainly in big degree
The low frequency noise that acoustic material is difficult to filter out, so active noise reduction equipment optionally carries out noise reduction process to low frequency noise,
So as to save dividing filter, the calculation amount for adjusting and filtering when making an uproar parameter can be also reduced, improves the detection speed of detection device.
Preferably, preset part-frequency point can select 8KHz, 4KHz, 2KHz, 1KHz, 750Hz, 500Hz, 250Hz and
125Hz.So as to which the first noise information to be divided into the noise information of the frequency band of 8 non-overlapping copies.
In one embodiment, as shown in Fig. 2, step S200 includes step S210：Pass through at least two dividing filters
First noise information is divided into the noise information of at least two non-overlapping copies frequency bands.
In one embodiment, if preset part-frequency point selection 8KHz, 4KHz, 2KHz, 1KHz, 750Hz, 500Hz,
First noise information is then divided into the frequency band of 8 non-overlapping copies by 250Hz and 125Hz by corresponding 8 dividing filters
Noise information.
In one embodiment, as shown in figure 3, step S200 includes step S220：First is made an uproar according to predeterminated frequency section
Message breath separates the noise information of the frequency band of at least two non-overlapping copies according to time order and function successively.
Separate the process of the noise information of different frequency sections successively according to time order and function, can be according to preset sequence according to
The secondary noise information for separating each preset frequency band.Preset sequence can be from low frequency section to high-frequency section, can also
It is from high-frequency section to low frequency section, can also be divided by random order.For example, first, separate the first noise information
The noise information of middle 4KHz-2KHz frequency bands, related device is pushed to by divided down version.Then, it separates in the first noise information
The noise information of 2KHz-1KHz frequency bands, then divided down version is pushed to related device, then, separate in the first noise information
Testing result is pushed to related device by the noise information of 1KHz-500Hz frequency bands.By separating making an uproar for each frequency band successively
Message breath can reduce the calculation amount in the same period, contribute to the quick response of active noise reduction process.With calculation amount
The quantity for also contributing to reduce component is reduced, reduces cost.
Step S300：According to the noise information of the frequency band of non-overlapping copies, adjustment is corresponding to the frequency of non-overlapping copies respectively
At least two filters of the noise information of section are made an uproar parameter.
In one embodiment, filter is made an uproar corresponding between parameter and the noise information of the frequency band of non-overlapping copies isolated
Relationship can be corresponded or the noise information of multiple frequency bands corresponds to a filter and makes an uproar parameter, can also be one
The noise information of frequency band corresponds to multiple filters and makes an uproar parameter.
In one embodiment, as shown in Fig. 2, step S300 includes step S310：Pass through at least two frequency dividing filter of connection
The control module of wave device filters parameter of making an uproar come the noise information adjustment at least two of the frequency band according to non-overlapping copies.
Filter the filter factor that parameter of making an uproar includes processing wave filter.It in one embodiment, can be according to 5 dividing filters
The noise information of 5 non-overlapping copies frequency bands separated, the filter factor of 5 processing wave filters of corresponding adjustment.It can also be according to 8
The noise information of the frequency band of 8 non-overlapping copies that a dividing filter separates, corresponding 3 or 5 processing wave filters of adjustment
Filter factor.
In one embodiment, as shown in figure 3, step S300 includes step S320：According at least two non-overlapping copies
The noise information of frequency band is sequentially adjusted in the noise of the frequency band corresponding at least two non-overlapping copies according to time order and function respectively
At least two filters of information are made an uproar parameter.
In addition to section can adjusting filter simultaneously at the same time and make an uproar parameter, filter can also be adjusted according to time order and function and be made an uproar ginseng
Number.
In one embodiment, priority processing can be carried out to the noise information first isolated, ginseng of making an uproar is filtered to improve adjustment
Several response speeds.For example, it first isolates in the first noise information after the noise information of 4KHz-2KHz frequency bands, immediate precedence
Parameter of making an uproar is filtered according to noise information amendment 4KHz-2KHz frequency bands are corresponding.Then further according to isolate the first noise letter
The noise information adjustment 2KHz-1KHz frequency bands of 2KHz-1KHz frequency bands are corresponding in breath filters parameter of making an uproar.By to first detecting
The noise information arrived carries out priority processing, improves the response speed that parametric procedure of making an uproar is filtered in adjustment.
Step S400：Obtain the second noise information outside cavity.
Second noise information includes frequency, phase, amplitude of noise etc..Can the second noise be obtained by feedforward microphone
Information, feedforward microphone are arranged on outside cavity.Preferably, feedforward microphone can be arranged on to the driver with generating reverse phase noise
Distant place is driven the interference of reverse phase noise that device sends out to avoid obtaining during the second noise information.
Step S500：It receives and is made an uproar parameter according at least two filters after adjustment, handle the second noise information, to export tool
There is the audio data of noise reduction.
The audio data with noise reduction is generated according to the second noise information of parameter processing of making an uproar is filtered, passes through the audio data
The reverse phase noise sound wave that driver generation within the cavity differs 180 ° with the first noise sound wave phase in cavity is driven by chamber
The first internal noise neutralizes, so as to achieve the purpose that active noise reduction.Driver can be loud speaker, can be specifically moving-coil type
Loud speaker, pneumatic type loud speaker, electromagnetic loudspeaker etc..
In one embodiment, as shown in Fig. 2, step S500 includes step S510：By link control module at least
Two processing wave filters receive and filter the second noise information of parameter alignment processing of making an uproar according at least two, have noise reduction effect with output
The audio data of fruit.
Filter parameter of making an uproar is specifically correspondings with the processing wave filter of each frequency band, by adjusting the filter factor for handling wave filter with
Parameter of making an uproar is filtered in adjustment.It can set and filter the corresponding multiple processing wave filters of parameter of making an uproar from different, multiple processing wave filters are handled respectively
The noise information of different frequency sections in second noise information.For example, filter make an uproar parameter may include intermediate frequency filter make an uproar parameter and low frequency filter make an uproar
Parameter.Intermediate frequency filters the filter factor that parameter of making an uproar corresponds to the first processing wave filter, and low frequency filters parameter of making an uproar and corresponds to second processing wave filter
Filter factor, the filter factor by adjusting the first processing wave filter is made an uproar parameter to adjust intermediate frequency filter, at second
It manages the filter factor of wave filter and filters parameter of making an uproar to adjust low frequency.At this point, it is filtered in the second noise information of parameter processing of making an uproar according to low frequency
Low frequency noise information, to generate reverse phase low frequency noise；The intermediate frequency in the second noise information of parameter processing of making an uproar is filtered according to intermediate frequency to make an uproar
Message ceases, to generate reverse phase intermediate frequency noise.It should be noted that filter is made an uproar, parameter can also filter parameter of making an uproar including high frequency.
In one embodiment, as shown in figure 3, step S500 includes step S520：Receive and according to time order and function successively
It is made an uproar parameter according at least two filters after adjustment, handles the second noise information.
In one embodiment, according to time order and function be sequentially adjusted in can be according to preset sequence be sequentially adjusted in from it is different
The corresponding filter of frequency band is made an uproar parameter, and preset sequence can be from low frequency section to high-frequency section or from high-frequency section
To low frequency section, can also be adjusted by random order.
In one embodiment, as shown in figure 4, being further included before step S100：
Step S610：Receive the digital audio and video signals that external equipment intermittence generates.
Step S620：It detects whether to receive digital audio and video signals.When not receiving the digital audio and video signals, institute is performed
State the step of obtaining the first noise information in cavity；When receiving the digital audio and video signals, pause performs the acquisition chamber
The step of internal first noise information.As shown in figure 4, further, step S620 while pause performs step S100,
The step of jumping to the digital audio and video signals for receiving the generation of external equipment intermittence, continues detection digital audio and video signals in real time.
When user is listened to music by earphone, the external equipments such as loud speaker intermittent can play music in the cavity.If broadcasting
The period put the music on obtains the first noise information in cavity, will unavoidably be mingled with music information, just needs to increase at this time
Additional complex device filters out the music information got.And by (not playing sound when not receiving digital audio and video signals
When happy) the first noise information is obtained, can avoid, which increases additional complex device, filters out audio-frequency information in the cavity detected, section
About cost.
In one embodiment, detection mode can be to detect whether to receive the bitstream of digital audio and video signals to judge
Whether digital audio and video signals are received.Bitstream is the digital data flow formed of digital audio and video signals, by detecting bitstream
It more precisely can rapidly judge audio gaps, and it is relatively simple to detect required component.
Based on identical inventive concept, a kind of active noise reduction equipment presented below.As shown in figure 5, active noise reduction equipment includes：
Housing (not shown), for forming cavity with body-coupled.
First sensor 610, for obtaining the first noise information in cavity.
Frequency division module 620 is electrically connected with first sensor 610, for being divided the first noise information according to predeterminated frequency section
The noise information of frequency band at least two non-overlapping copies.
Control module 630 is connect with frequency division module 620, for the noise of the frequency band according at least two non-overlapping copies
Information, respectively adjustment are made an uproar parameter corresponding at least two filters of the noise information of the frequency band of at least two non-overlapping copies.
Second sensor 640, for obtaining the second noise information outside cavity.
Audio processing modules 650 are connect respectively with control module 630, second sensor 640, for reception and according to tune
At least two filters after whole are made an uproar parameter, handle the second noise information, to export the audio data with noise reduction.
Housing is a part for the audio devices such as earphone, and first sensor 610 can be feedback microphones, second sensor
640 can be feedforward microphone.The processing step of frequency division module 620 can refer to the step S200 of above-described embodiment.Control mould
The processing step of block 630 can refer to the step S300, step S310 of above-described embodiment.The processing step of audio processing modules 650
Suddenly the step S500 of above-described embodiment can be referred to.Details are not described herein.
In one embodiment, frequency division module 620 includes at least two of the frequency band corresponding at least two non-overlapping copies
A dividing filter.The processing step of dividing filter can refer to the step S210 of above-described embodiment.
In one embodiment, frequency division module 620 is used for the first noise information according to predeterminated frequency section according to time elder generation
Separate the noise information of the frequency band of at least two non-overlapping copies successively afterwards.The processing step of dividing filter can refer to above-mentioned
The step S220 of embodiment.
In one embodiment, control module 630 is used for the noise information of the frequency band according at least two non-overlapping copies,
It is sequentially adjusted at least two filters of the noise information of the frequency band corresponding at least two non-overlapping copies respectively according to time order and function
It makes an uproar parameter.The processing step of control module 630 can refer to the step S320 of above-described embodiment.
In one embodiment, audio processing modules 650 include at least two processing filtering of link control module 630
Device.Wave filter is handled for handling the second noise information.The step of above-described embodiment can be referred to by handling the processing step of wave filter
Rapid S510.
In one embodiment, audio processing modules 650 for receive and according to time order and function successively according to adjustment after
At least two filter parameter of making an uproar, and handle the second noise information, to export the audio data with noise reduction.Audio processing modules
650 processing step can refer to the step S520 of above-described embodiment.
In one embodiment, as shown in fig. 6, active noise reduction equipment includes the housing for forming cavity with body-coupled
710, housing 710 is a part for the audio devices such as headphone or In-Ear Headphones.Noise outside housing 710 some
It can leak into housing 710, the noise in housing 710 is known as the first noise, and the noise outside housing 710 is known as the second noise.The
One sensor 720 is feedback microphones, and first sensor 720 obtains the first noise information in cavity, and the first noise information leads to
The form for crossing audio stream 1 is transmitted to frequency division module 730, and the first noise information is divided by frequency division module 730 according to predeterminated frequency section
Control stream 4 is formed after the noise information of multiple non-overlapping copies frequency bands and is transmitted to control module 740, control module 740 receives simultaneously
Processing control stream 4 is made an uproar parameter with adjusting the filter of at least two different frequency sections, and filter parameter of making an uproar includes filter factor.Then it controls
Module 740 is by controlling stream 2 that the parameter of making an uproar of the filter after adjustment is transferred to audio processing modules 750,750 basis of audio processing modules
Filter after adjustment is made an uproar the filter factor of parameter adjustment itself processing wave filter, which obtains
The second noise information taken, to export the audio data with noise reduction to driver 770.Driver 770 plays audio number
According to generation noise reduction sound.
Further, control module 740 connects Audio Input Modules 780.The intermittent input number of Audio Input Modules 780
Audio signal (such as inputting more song audio signals, existence time gap between per song) frequency division module 730 has switch work(
Can, it is performed in per song gap and carries out frequency dividing work.Specifically, control module 740 connects Audio Input Modules 780, pass through
Whether bitstream (the i.e. control stream 1) judgement for detecting digital audio and video signals is currently in music gap.Control module 740 is according to control
System stream 1 generates control stream 3, and frequency division module 730 is opened in music gap with control.
The active noise reduction equipment realizes that on the basis of former noise reduction process still remaining first noise is believed in acquisition cavity
Breath is made an uproar parameter according to the filter of the first noise information crossover rate section feedback adjustment, the filter after adjustment make an uproar parameter can be used for eliminating it is remaining
Noise information improves the accuracy of active noise reduction processing.
Embodiment described above only expresses the several embodiments of the present invention, and description 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 those of ordinary skill in the art are come
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 (19)
1. a kind of active denoising method, the noise in cavity formed for reducing housing and body-coupled, including：
Obtain the first noise information in the cavity；
First noise information is divided into the noise information of the frequency band of at least two non-overlapping copies according to predeterminated frequency section；
According to the noise information of the frequency band of the non-overlapping copies, adjustment respectively corresponds to making an uproar for the frequency band of the non-overlapping copies
At least two filters of message breath are made an uproar parameter；
Obtain the second noise information outside the cavity；
It receives and filters parameter of making an uproar according to described at least two after adjustment, handle second noise information, there is drop with output
The audio data for effect of making an uproar.
2. active denoising method according to claim 1, wherein, it is described to be believed first noise according to predeterminated frequency section
The step of ceasing the noise information of frequency band for being divided at least two non-overlapping copies, including：
First noise information is divided into the noise of at least two non-overlapping copies frequency bands by least two dividing filters
Information.
3. active denoising method according to claim 2, wherein, the noise of the frequency band according to the non-overlapping copies
Information, respectively adjustment corresponding to the non-overlapping copies frequency band noise information at least two filters make an uproar parameter the step of, packet
It includes：
By connecting the control module of at least two dividing filter come the noise of the frequency band according to the non-overlapping copies
Parameter of making an uproar is filtered in information adjustment described at least two.
4. active denoising method according to claim 3, wherein, it is described to receive and according to described at least two after adjustment
Parameter of making an uproar is filtered, handles second noise information, there is the step of audio data of noise reduction with output, including：
It is received by at least two processing wave filters for connecting the control module and filters parameter pair of making an uproar according to described at least two
Second noise information should be handled, to export the audio data with noise reduction.
5. active denoising method according to claim 1, wherein, it is described to be believed first noise according to predeterminated frequency section
The step of ceasing the noise information of frequency band for being divided at least two non-overlapping copies, including：
First noise information is separated to the frequency of at least two non-overlapping copies successively according to predeterminated frequency section according to time order and function
The noise information of rate section.
6. active denoising method according to claim 1, wherein, the frequency according at least two non-overlapping copies
The noise information of section, adjustment is corresponding at least two filters of the noise information of the frequency band of at least two non-overlapping copies respectively
The step of parameter of making an uproar, including：
According to the noise information of the frequency band of at least two non-overlapping copies, it is sequentially adjusted in corresponding to respectively according to time order and function
At least two filters of the noise information of the frequency band of at least two non-overlapping copies are made an uproar parameter.
7. active denoising method according to claim 1, wherein, it is described to receive and according to described at least two after adjustment
The step of filtering parameter of making an uproar, handling second noise information, including：
It receives and filters parameter of making an uproar according to described at least two after adjustment successively according to time order and function, handle the second noise letter
Breath.
8. active denoising method according to claim 1, wherein, it is described to obtain the first noise information in the cavity
Before step, further include：
Receive the digital audio and video signals that external equipment intermittence generates；
It detects whether to receive the digital audio and video signals, when not receiving the digital audio and video signals, performs the acquisition institute
The step of stating the first noise information in cavity；When receiving the digital audio and video signals, pause performs the acquisition chamber
The step of internal first noise information.
9. active denoising method according to claim 8, wherein, it is described to detect whether to receive the digital audio letter
Number, when not receiving the digital audio and video signals, perform it is described obtain in the cavity the first noise information the step of；It receives
During to the digital audio and video signals, suspend the step of performing the first noise information in the acquisition cavity, including：
It detects whether to receive the bitstream of the digital audio and video signals to judge whether to receive the digital audio and video signals.
10. a kind of active noise reduction equipment, including：
Housing, for forming cavity with body-coupled；
First sensor, for obtaining the first noise information in the cavity；
Frequency division module is electrically connected with the first sensor, for being divided into first noise information according to predeterminated frequency section
The noise information of the frequency band of at least two non-overlapping copies；
Control module is connect with the frequency division module, is believed for the noise of the frequency band according at least two non-overlapping copies
Breath, respectively adjustment are made an uproar parameter corresponding at least two filters of the noise information of the frequency band of at least two non-overlapping copies；
Second sensor, for obtaining the second noise information outside the cavity；
Audio processing modules are connect respectively with the control module, second sensor, for reception and according to after adjustment
At least two filter parameter of making an uproar, and handle second noise information, to export the audio data with noise reduction.
11. active noise reduction equipment according to claim 10, wherein, the frequency division module includes corresponding to described at least two
At least two dividing filters of the frequency band of a non-overlapping copies.
12. active noise reduction equipment according to claim 10, wherein, the audio processing modules include connecting the control
At least two processing wave filters of module；The processing wave filter is used to handle second noise information.
13. active noise reduction equipment according to claim 10, wherein, the frequency division module is used for will according to predeterminated frequency section
First noise information separates the noise information of the frequency band of at least two non-overlapping copies according to time order and function successively.
14. active noise reduction equipment according to claim 10, wherein, the control module is used for according to described at least two
The noise information of the frequency band of non-overlapping copies is sequentially adjusted in corresponding at least two non-overlapping copies according to time order and function respectively
At least two filters of noise information of frequency band make an uproar parameter.
15. active noise reduction equipment according to claim 10, wherein, the audio processing modules for receive and according to when
Between successively made an uproar parameter according at least two filter after adjustment successively, handle second noise information, there is drop with output
The audio data for effect of making an uproar.
16. active noise reduction equipment according to claim 10, further comprises, the audio letter being connect with the control module
Number input module；The audio signal input module is used to receive the digital audio and video signals of external equipment intermittence generation；Wherein,
When the control module detects that the audio signal input module does not receive the digital audio and video signals, the control
Module controls the frequency division module to work；It is described that the control module detects that the audio signal input module receives
During digital audio and video signals, the control module controls the frequency division module break-off.
17. active noise reduction equipment according to claim 16, wherein, it is single that the control module further includes bitstream detection
Member, the bitstream detection unit are used to detect whether the audio signal input module receives the digital audio and video signals
Bitstream, to judge whether to receive the digital audio and video signals.
18. a kind of active noise reduction earphone, including：
Housing, for forming cavity with body-coupled；
First sensor, for obtaining the first noise information in the cavity；
Frequency division module is electrically connected with the first sensor, for being divided into first noise information according to predeterminated frequency section
The noise information of the frequency band of at least two non-overlapping copies；
Control module is connect with the frequency division module, for the noise information of the frequency band according to the non-overlapping copies, is adjusted respectively
At least two filters of the noise information of the whole frequency band corresponding to the non-overlapping copies are made an uproar parameter；
Second sensor, for obtaining the second noise information outside the cavity；
Audio processing modules are connect respectively with the control module, second sensor, for reception and according to after adjustment
At least two filter parameter of making an uproar, and handle second noise information, to export the audio data with noise reduction.
19. active noise reduction earphone according to claim 18, wherein, the earphone includes headphone or In-Ear ear
Machine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2018/071531 WO2019134115A1 (en) | 2018-01-05 | 2018-01-05 | Active noise reduction method and apparatus, and earphones |
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| CN108235818A true CN108235818A (en) | 2018-06-29 |
| CN108235818B CN108235818B (en) | 2020-02-21 |
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| CN108235818B (en) | 2020-02-21 |
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