CN106937190A - Terminal, noise cancelling headphone and earphone noise-reduction method - Google Patents
Terminal, noise cancelling headphone and earphone noise-reduction method Download PDFInfo
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- CN106937190A CN106937190A CN201511024592.1A CN201511024592A CN106937190A CN 106937190 A CN106937190 A CN 106937190A CN 201511024592 A CN201511024592 A CN 201511024592A CN 106937190 A CN106937190 A CN 106937190A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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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
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of terminal, noise cancelling headphone and earphone noise-reduction method are the embodiment of the invention provides, institute's terminal includes：First microphone, for gathering the noise in environment, and is converted into outer noise signal by the noise；Processor, the reference audio signal for receiving noise cancelling headphone transmission, the reference audio signal is obtained according to reference audio, and the reference audio is the audio in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone；The processor is additionally operable to according to the reference audio signal and the outer noise signal generation noise compensation signal, and the processor is additionally operable to according to input audio signal and the noise compensation signal generation play signal；The processor is additionally operable to send the play signal to the noise cancelling headphone, so that the play signal is converted into broadcasting audio by the noise cancelling headphone.The present invention can reduce the cost and weight of noise cancelling headphone.
Description
Technical field
The present invention relates to signal transacting, more particularly to a kind of terminal, noise cancelling headphone and earphone noise-reduction method.
Background technology
Earphone is a kind of converting unit, and it can convert electrical signals into the sound wave that can be heard, good using one of earphone
Place can be the noise for separating surrounding environment.In the various acoustic surroundings of people, commonly referred to as more than 90dB and people not
The sound that subjective can receive is noise, the generation of noise and to exist be inevitable, and noise can have a strong impact on the sense of audience
By and mood.
Noise cancelling headphone can to a certain extent eliminate noise, improve the audition impression of people.Noise cancelling headphone is divided into passively
Noise cancelling headphone and active noise reduction earphone, passive noise cancelling headphone usually using special acoustic material, by the eardrum of ear with it is outer
Boundary is environmentally isolated out, for example In-Ear Headphones, bag aural headphone.Active noise reduction earphone can solve passive noise cancelling headphone drop
The drawbacks of effect of making an uproar is undesirable, active noise reduction earphone utilizes sound wave principle of cancellation, is made an uproar using a kind of frequency, amplitude and environment
Sound is identical, but the counteracting sound wave of 180 ° of phase difference is superimposed with ambient noise, to offset the influence of ambient noise.
In the prior art, active noise reduction earphone realizes noise reduction using noise reduction chip, and noise reduction chip needs to power could work,
Therefore active noise reduction earphone need to configure battery or charger, relatively costly, and weight is larger.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of terminal, noise cancelling headphone and earphone noise-reduction method, can solve
The certainly big problem of noise cancelling headphone high cost, quality.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical scheme：
First aspect, there is provided a kind of terminal, the terminal includes：
First microphone, for gathering the ambient noise in environment, and is converted into outer noise signal by the ambient noise；
Processor, the reference audio signal for receiving noise cancelling headphone transmission, the reference audio signal is according to reference audio
Obtain, the reference audio is the audio in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone；
The processor is additionally operable to according to the reference audio signal and the outer noise signal generation noise compensation signal, institute
Processor is stated to be additionally operable to according to input audio signal and the noise compensation signal generation play signal；
The processor is additionally operable to send the play signal to the noise cancelling headphone, so that the noise cancelling headphone will be described
Play signal is converted into broadcasting audio.
The terminal of the embodiment of the present invention, the outer noise signal in collection environment receives the reference audio letter from noise cancelling headphone
Number, the purpose for filtering noise is reached after treatment, for noise cancelling headphone, without being equipped with noise reduction chip, without using
The charger supporting with noise reduction chip or battery, so as to reduce the quality of noise cancelling headphone, reduce cost.
Optionally, the processor is used for according to the reference audio signal and outer noise signal generation noise compensation signal,
Including：
The processor is used to use variable step size adaptive filtering algorithm, according to the reference audio signal and the outer noise
Noise compensation signal described in signal generation.
Optionally, the processor is used to use variable step size adaptive filtering algorithm, according to the reference audio signal and institute
State outer noise signal and generate the noise compensation signal, including：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n),
W (the n+1)=λ of w (n)+2 (n) e (n) x (n),
Wherein, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is noise school
Positive signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, and N (n) is ear muff
Interior noise signal, N (n) is directly proportional to outer noise signal y (n), xTN () is the matrix inversion of input audio signal,
W (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
Optionally, the processor is used for according to input audio signal and the noise compensation signal generation play signal, bag
Include：
The processor be used for by the input audio signal and the noise compensation Signal averaging and divided by 2 to generate
State play signal.
Optionally, the terminal also includes the 3rd microphone, and the 3rd microphone is used to gather input audio, and by institute
State input audio and be converted into input audio signal.
Second aspect, there is provided a kind of noise cancelling headphone, the noise cancelling headphone includes：
Second microphone, is arranged within the ear muff of the noise cancelling headphone, for gathering the reference audio in the ear muff,
The reference audio is converted into reference audio signal, and the reference audio signal is sent to terminal；
Loudspeaker, for receiving the play signal from the terminal, and is converted into broadcasting audio by the play signal；
Wherein, the play signal is given birth to by the processor for being arranged at terminal according to input audio signal and noise compensation signal
It is described outer into, the reference audio signal by the processor according to outer noise signal and the reference audio signal generation
Noise signal is generated by the ambient noise being arranged in the first microphone of terminal collection environment.
The noise cancelling headphone of the embodiment of the present invention is provided with a microphone to gather reference audio signal in ear muff, and will ginseng
Examine audio signal to send to terminal, noise reduction process carried out by terminal, so as to noise reduction chip need not be equipped with, without using and
Noise reduction chip supporting charger or battery, therefore weight is small, low cost.
Optionally, the noise cancelling headphone also includes headset plug, and the headset plug is five-part form headset plug, the ear
Machine transplanting of rice head includes from top to bottom：
First segment, is connected for the second microphone with the terminal；
Second section, for being connected to the ground；
Section three, for being connected with right loudspeaker；
Section four, for being connected with left speaker；
Section five, for connecting with the 3rd Mike's wind facies.
The headset plug of the noise cancelling headphone of the embodiment of the present invention is five-part form plug, can be gathered microphone in noise cancelling headphone
Reference audio signal transmission to terminal processed.
Optionally, the noise cancelling headphone also includes headset plug, and the headset plug is four-section type headset plug, the ear
Machine transplanting of rice head includes from top to bottom：
First segment, for being connected to the ground；
Second section, for being connected with right loudspeaker；
Section three, for being connected with left speaker；
Section four, it is connected for the second microphone with the terminal.
The embodiment of the present invention can also use existing four-part form plug, improve compatible performance.
The third aspect, there is provided a kind of earphone noise-reduction method, methods described includes：
Noise in terminal collection environment, and the noise is converted into outer noise signal；
The terminal receives the reference audio signal that noise cancelling headphone sends, and the reference audio signal is obtained according to reference audio
Take, the reference audio is the audio in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone；
The terminal generates noise compensation signal according to the reference audio signal and the outer noise signal, and according to input
Audio signal and the noise compensation signal generation play signal；
The terminal sends to the noise cancelling headphone play signal, so that the noise cancelling headphone is by the play signal
It is converted into broadcasting audio.
Optionally, the terminal generates noise compensation signal according to reference audio signal and outer noise signal, including：
The terminal uses variable step size adaptive filtering algorithm, according to the reference audio signal and the outer noise signal life
Into the noise compensation signal.
Optionally, the terminal uses variable step size adaptive filtering algorithm, is given birth to according to reference audio signal and outer noise signal
Into the noise compensation signal, including：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n),
W (the n+1)=λ of w (n)+2 (n) e (n) x (n),
Wherein, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is noise school
Positive signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, and N (n) is ear muff
Interior noise signal, N (n) is directly proportional to outer noise signal y (n), xTN () is the matrix inversion of input audio signal,
W (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
Optionally, the terminal is according to input audio signal and noise compensation signal generation play signal, including：
The terminal by the input audio signal and the noise compensation Signal averaging and divided by 2 generating the broadcasting
Signal.
Optionally, methods described also includes：
The terminal collection input audio, and the input audio is converted into input audio signal.
Fourth aspect, there is provided a kind of earphone noise-reduction method, methods described includes：
Reference audio in noise cancelling headphone collection ear muff, and the reference audio is converted into reference audio signal；
The noise cancelling headphone sends to terminal the reference audio signal；
The noise cancelling headphone receives the play signal from the noise reduction device of earphone, and the play signal is converted into broadcasts
Playback is frequently；
Wherein, the play signal is given birth to by the processor for being arranged at terminal according to input audio signal and noise compensation signal
It is described outer into, the reference audio signal by the processor according to outer noise signal and the reference audio signal generation
Noise signal is generated by the ambient noise being arranged in the first microphone of terminal collection environment.
A kind of terminal is the embodiment of the invention provides, the outer noise signal in collection environment receives the ginseng from noise cancelling headphone
Audio signal is examined, the purpose for filtering noise is reached after treatment, for noise cancelling headphone, without being equipped with noise reduction chip,
Without using the charger or battery supporting with noise reduction chip, so as to reduce the quality of noise cancelling headphone, cost is reduced.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary, this hair can not be limited
Bright protection domain.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 show the schematic diagram that the terminal of the embodiment of the present invention and noise cancelling headphone are used cooperatively；
Fig. 2 show the principle of noise reduction figure of the embodiment of the present invention；
Fig. 3 show the terminal structure schematic diagram of the embodiment of the present invention；
Fig. 4 show the structural representation of the noise cancelling headphone of the embodiment of the present invention；
Fig. 5 show the schematic diagram of the headset plug of the embodiment of the present invention.
By above-mentioned accompanying drawing, it has been shown that the present invention clearly embodiment, will hereinafter be described in more detail.These accompanying drawings
With the scope that word description is not intended to be limited by any mode present inventive concept, but by reference to specific embodiment
For those skilled in the art illustrate idea of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of protection of the invention is belonged to.
For the comprehensive understanding present invention, numerous concrete details are refer in the following detailed description, but people in the art
Member is it should be understood that the present invention can be realized without these details.In other embodiments, it is not described in detail known
Method, process, component and circuit, in order to avoid undesirably result in embodiment obscure.
A kind of terminal, noise cancelling headphone and earphone noise-reduction method are the embodiment of the invention provides, noise cancelling headphone can be improved
Noise reduction.
Fig. 1 show the schematic diagram that the terminal of the embodiment of the present invention and noise cancelling headphone are used cooperatively, as shown in figure 1, noise reduction ear
The reference audio in the collection noise cancelling headphone ear muff of second microphone 111 in machine 110, reference audio is converted into by reference audio
Signal, and reference audio signal is sent to terminal 120.
Reference audio is actually the superposition of noise and broadcasting audio in ear muff.
The terminal 120 of the embodiment of the present invention can be mobile phone, or can be ipad, or can be the equipment such as desktop computer.
Ambient noise in the first microphone (not shown in figure 1) collection environment of terminal 120, and ambient noise is turned
Outer noise signal is turned to, terminal 120 generates noise compensation signal according to reference audio signal and outer noise signal, according to defeated
Enter audio signal and noise compensation signal generation play signal.
Terminal 120 sends to noise cancelling headphone 110 play signal, and play signal is converted into broadcasting sound by noise cancelling headphone 110
Frequently, so that user listens to.
Earphone jack 122 is provided with terminal 110, noise cancelling headphone 110 is configured with headset plug 112, is inserted by earphone
Hole 122 and the cooperation of headset plug 112, realize the signal transmission between terminal 120 and noise cancelling headphone 110.
In the embodiment of the present invention, the reference audio in second microphone collection ear muff in noise cancelling headphone, at other signals
Reason etc. all moves to terminal and carries out, and due to second microphone small volume, consumes energy small, therefore volume need not be equipped with noise cancelling headphone
Outer battery, therefore small volume, quality are also smaller.
Terminal and noise cancelling headphone the following detailed description of the embodiment of the present invention carry out the principle of noise reduction.Fig. 2 show the present invention
The signal of embodiment flows to schematic diagram, and the application scenarios shown in Fig. 2 are as shown in Figure 1.Label identical in Fig. 2 and Fig. 1
Part has same or analogous function, will not be repeated here.
As shown in Fig. 2 positioned at the 3rd microphone (not shown in Fig. 2) the collection user's communication audio generation input of terminal
Audio signal, or input audio signal is produced by the various players/App of terminal.Ideally, if do not had
Noise is mixed into, input audio signal reverts to broadcasting audio, listened to for user via the loudspeaker of noise cancelling headphone.
In practice, input audio signal can be mixed into ambient noise, can also be mixed into the internal various devices such as terminal, noise cancelling headphone
The noise that part is produced, can also be mixed into other noises, it is therefore desirable to by noise reduction process, could be listened to for user.
In the embodiment of the present invention, the first microphone (not shown in Fig. 2) the collection ambient noise in terminal, generation is outer to make an uproar
Acoustical signal.
The reference audio in second microphone collection ear muff in noise cancelling headphone, generates reference audio signal.Reference audio is believed
Number it is that playing audio signal is superimposed with noise signal in ear muff in ear muff, the noise signal in ear muff and the strong phase of outer noise
Close, it is believed that noise signal and the proportional relation of outer noise signal in ear muff, the proportionate relationship can be obtained by testing.
The processor 200 of terminal is arranged at according to outer noise signal and reference audio signal generation noise compensation signal.It is preferable
Under state, noise compensation signal is equal to playing audio signal.
The method for generating noise correcting signal is in simple terms that outer noise signal is reverse, according to proportionate relationship obtained above
It is superimposed with reference audio.
In the embodiment of the present invention, input audio signal enters processor, is superimposed with noise correcting signal, ideally,
Signal after superposition is the twice of playing audio signal, therefore, processor can be broadcast by the signal after superposition divided by 2
Playback frequently, and sends into the loudspeaker of noise cancelling headphone.
For ease of illustrating, processor is divided into two parts in Fig. 2, Part I is wave filter, generates noise compensation signal,
Part II superimposer, generates playing audio signal.
In practical application, noise cannot be completely filtered in noise compensation signal, therefore, noise compensation signal with play audio
Signal is unequal, but partial noise signal has been filtered in noise compensation signal, divided by 2 after being superimposed with input audio signal,
Compared with input audio signal, most of noise signal has been filtered.Simply with numerical example, included in input audio signal
Noise be 10, noise is 5 in noise compensation signal, and divided by after 2, noise is 7.5, than being originally inputted sound for superposition
Noise in frequency signal is small.
By after the multiple filtering process of processor, the noise in noise correcting signal can be gradually reduced, and be with above-mentioned numeral
Example, can be near close to 0 by noise so that the noise cancelling headphone of the embodiment of the present invention can filter most noises.
The filtering of the embodiment of the present invention be one gradually filtering and iteration process, therefore, the embodiment of the invention provides with
Under variable step filtering algorithm：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n) (1)
W (the n+1)=λ of w (n)+2 (n) e (n) x (n) (3)
In above-mentioned formula, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is
Noise compensation signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, N (n)
It is the noise signal in ear muff, N (n) is directly proportional to outer noise signal y (n), xTN () is the square of input audio signal
Battle array is inverted, and w (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
In above-mentioned formula, noise signal N (n) in ear muff cannot be gathered directly, while N (n) and the outer noise
Signal y (n) is directly proportional, and proportionality coefficient can rule of thumb or experimental data is configured will not be repeated here.
In formula (4), a and b is variable, empirically or experimentally data can be configured, in the present embodiment,
A=21, b=1.21.
E (n) is calculated by above-mentioned formula (1), xT (n) is calculated using formula (2) by the method for iteration, it is public
Formula (3) and (4) are for control convergence speed.
The structure of terminal of the present invention and noise cancelling headphone is received in detail below.
Fig. 3 show the structural representation of the terminal of the embodiment of the present invention, as shown in figure 3, the terminal includes：
First microphone 301, for gathering the ambient noise in environment, and is converted into outer noise letter by the ambient noise
Number.
Microphone can be to translate audio into the device for electric signal, and the microphone in the embodiment of the present invention can be using existing
There are the microphone techniques in technology, will not be repeated here.
Processor 302, the reference audio signal for receiving noise cancelling headphone transmission, the reference audio signal is according to reference
Audio is obtained, and the reference audio is the sound in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone
Frequently；
The processor 302 is additionally operable to according to the reference audio signal and the outer noise signal generation noise compensation letter
Number, the processor is additionally operable to according to input audio signal and the noise compensation signal generation play signal；
The processor 302 is additionally operable to send the play signal to the noise cancelling headphone, so that the noise cancelling headphone will
The play signal is converted into broadcasting audio.
The processor 302 is used for according to the reference audio signal and outer noise signal generation noise compensation signal, bag
Include：
The processor 302 is used to use variable step size adaptive filtering algorithm, according to the reference audio signal and described outer
Noise signal generates the noise compensation signal.
The processor 302 is used for according to input audio signal and the noise compensation signal generation play signal, including：
The processor 302 be used for by the input audio signal and the noise compensation Signal averaging and divided by 2 to generate
Play signal.
Input audio in the embodiment of the present invention can be the output audio, or other application programs of music player
Output audio.
The terminal also includes the 3rd microphone 303, and the 3rd microphone 303 is used to gather input audio, and by institute
State input audio and be converted into input audio signal.
3rd microphone 303 can be terminal, the microphone for call of such as mobile phone, the input of the embodiment of the present invention
During audio can be mobile phone use, the voice of user and peer user call.
Fig. 4 show the structural representation of the noise cancelling headphone of the embodiment of the present invention, as shown in figure 4, noise cancelling headphone includes：
Second microphone 401, is arranged within the ear muff 403 of the noise cancelling headphone, for gathering in the ear muff 403
Reference audio, the reference audio is converted into reference audio signal, and the reference audio signal is sent to terminal；
Loudspeaker 402, for receiving the play signal from the terminal, and is converted into broadcasting sound by the play signal
Frequently.
In order to carry out data exchange with terminal, noise cancelling headphone also includes headset plug 500.
The noise cancelling headphone of the embodiment of the present invention, increased a microphone to collect audio signal in ear muff, reach noise reduction
Purpose, without being equipped with special noise reduction chip, without be equipped with noise reduction chip supporting battery or charger, from
And cost is reduced, reduce the weight of noise cancelling headphone.
Fig. 5 show the schematic diagram of the headset plug of the embodiment of the present invention, and Fig. 5 show five-part form headset plug, described
Headset plug includes from top to bottom：
First segment 501, is connected for the second microphone with terminal；
Second section 502, for being connected to the ground；
Section 3 503, for being connected with right loudspeaker；
Section 4 504, for being connected with left speaker；
Section 5 505, for connecting with the 3rd Mike's wind facies.
The headset plug of five-part form has more a section than general four-section type headset plug, and for having more saves the second wheat with terminal
Gram wind facies connects.
The headset plug of the embodiment of the present invention can also use general four-part form plug, and the headset plug of four-part form is from top
Include to bottom：
First segment, for being connected to the ground；
Second section, for being connected with right loudspeaker；
Section three, for being connected with left speaker；
Section four, it is connected for the second microphone with the terminal.
The four-section type headset plug of the embodiment of the present invention is different from general four-part form plug, will be originally used for and gather input
Section four of audio is changed to be connected with the second microphone of terminal.Therefore, according to four-part form plug, noise cancelling headphone is only capable of
Realize listening function, it is impossible to realize voice call function.
The noise cancelling headphone of the embodiment of the present invention, can reduce cost, reduce the quality of earphone.
Corresponding with above-mentioned terminal, the embodiment of the present invention additionally provides a kind of earphone noise-reduction method, and methods described includes：
Noise in terminal collection environment, and the noise is converted into outer noise signal；
The terminal receives the reference audio signal that noise cancelling headphone sends, and the reference audio signal is obtained according to reference audio
Take, the reference audio is the audio in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone；
The terminal generates noise compensation signal according to the reference audio signal and the outer noise signal, and according to input
Audio signal and the noise compensation signal generation play signal；
The terminal sends to the noise cancelling headphone play signal, so that the noise cancelling headphone is by the play signal
It is converted into broadcasting audio.
Optionally, the terminal generates noise compensation signal according to reference audio signal and outer noise signal, including：
The terminal uses variable step size adaptive filtering algorithm, according to the reference audio signal and the outer noise signal life
Into the noise compensation signal.
Optionally, the terminal uses variable step size adaptive filtering algorithm, is given birth to according to reference audio signal and outer noise signal
Into the noise compensation signal, including：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n),
W (the n+1)=λ of w (n)+2 (n) e (n) x (n),
Wherein, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is noise school
Positive signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, and N (n) is ear muff
Interior noise signal, N (n) is directly proportional to outer noise signal y (n), xTN () is the matrix inversion of input audio signal,
W (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
Optionally, the terminal is according to input audio signal and noise compensation signal generation play signal, including：
The terminal by the input audio signal and the noise compensation Signal averaging and divided by 2 generating the broadcasting
Signal.
Optionally, methods described also includes：
The terminal collection input audio, and the input audio is converted into input audio signal.
Corresponding with above-mentioned noise cancelling headphone, the embodiment of the present invention additionally provides a kind of earphone noise-reduction method, and methods described includes：
Reference audio in noise cancelling headphone collection ear muff, and the reference audio is converted into reference audio signal；
The noise cancelling headphone sends to terminal the reference audio signal；
The noise cancelling headphone receives the play signal from the noise reduction device of earphone, and the play signal is converted into broadcasts
Playback is frequently.
The earphone noise-reduction method that the embodiment of the invention provides, can reduce the cost and quality of noise cancelling headphone.
The terminal of the embodiment of the present invention, noise cancelling headphone and earphone noise-reduction method, ginseng is obtained by gathering the reference audio in ear muff
Examine audio signal, and obtain the outer noise signal of the environment of outside, then according to reference audio signal and outer noise signal
Generation noise compensation signal.Because reference audio includes the interior noise signal inside earphone, therefore, believed according to reference audio
Number and the noise compensation signal of outer noise signal generation take into account interior noise signal in earphone, can preferably offset each
Plant influence of the noise to input audio signal.The embodiment of the present invention uses above method noise reduction, without being equipped with special noise reduction
Chip, without be equipped with the matching used charger of noise reduction chip or battery, therefore can reduce noise cancelling headphone into
This, while making noise cancelling headphone lighter weight.
For system embodiment, because it corresponds essentially to embodiment of the method, so related part is referring to embodiment of the method
Part explanation.System embodiment described above is only schematical, wherein described illustrate as separating component
Unit can be or may not be physically separate, the part shown as unit can be or may not be
Physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to actual need
Some or all of module therein is selected to realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The present invention can be described in the general context of computer executable instructions, such as program module.
Usually, program module include performing particular task or realize the routine of particular abstract data type, program, object, component,
Data structure etc..The present invention can also be in a distributed computing environment put into practice, in these DCEs, by leading to
Cross communication network and connected remote processing devices perform task.In a distributed computing environment, program module can be with position
In local and remote computer-readable storage medium including including storage device.
One of ordinary skill in the art will appreciate that realizing that all or part of step in above method implementation method can be by
Program is completed to instruct the hardware of correlation, and described program can be stored in computer read/write memory medium, here institute
The storage medium for claiming, such as：ROM, RAM, magnetic disc, CD etc..
Also, it should be noted that herein, such as first and second or the like relational terms are used merely to an entity
Or operation makes a distinction with another entity or operation, and not necessarily require or imply these entities or exist between operating
Any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to contain
Lid nonexcludability is included, so that process, method, article or equipment including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", and
It is not precluded within the process including the key element, method, article or equipment and also there is other identical element.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.Herein should
Lock is carried out with specific case to principle of the invention and implementation method to state, the explanation of above example is only intended to help and manages
The solution method of the present invention and its core concept；Simultaneously for those of ordinary skill in the art, according to thought of the invention,
Will change in specific embodiments and applications.In sum, this specification content should not be construed as to this
The limitation of invention.All any modification, equivalent substitution and improvements made on the basis of the present invention etc., are all contained in of the invention
In protection domain.
Claims (14)
1. a kind of terminal, it is characterised in that the terminal includes：
First microphone, for gathering the ambient noise in environment, and is converted into outer noise signal by the ambient noise；
Processor, is used for：
The reference audio signal that noise cancelling headphone sends is received, the reference audio signal is obtained according to reference audio, the ginseng
Examine the audio in the ear muff that audio is the second microphone collection being arranged in the ear muff of noise cancelling headphone；
According to the reference audio signal and the outer noise signal generation noise compensation signal, and according to input audio signal
With the noise compensation signal generation play signal；
The play signal is sent to the noise cancelling headphone, so as to be converted into for the play signal by the noise cancelling headphone broadcast
Playback is frequently.
2. terminal as claimed in claim 1, it is characterised in that the processor is used for using variable-step self-adaptive filter
Ripple algorithm, the noise compensation signal is generated according to the reference audio signal and the outer noise signal.
3. terminal as claimed in claim 2, it is characterised in that the variable step size adaptive filtering algorithm includes：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n),
W (the n+1)=λ of w (n)+2 (n) e (n) x (n),
Wherein, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is noise school
Positive signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, and N (n) is ear muff
Interior noise signal, N (n) is directly proportional to outer noise signal y (n), xTN () is the matrix inversion of input audio signal,
W (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
4. the terminal as described in any one of claims 1 to 3, it is characterised in that the processor is used for will be described defeated
Enter audio signal and the noise compensation Signal averaging and divided by 2 to generate the play signal.
5. the terminal as described in any one of Claims 1-4, it is characterised in that the terminal also includes the 3rd Mike
Wind, the 3rd microphone is used to gather input audio, and the input audio is converted into the input audio signal.
6. a kind of noise cancelling headphone, it is characterised in that the noise cancelling headphone includes：
Second microphone, is arranged within the ear muff of the noise cancelling headphone, for gathering the reference audio in the ear muff,
The reference audio is converted into reference audio signal, and the reference audio signal is sent to terminal；
Loudspeaker, for receiving the play signal from the terminal, and is converted into broadcasting audio by the play signal；
Wherein, the play signal is given birth to by the processor for being arranged at terminal according to input audio signal and noise compensation signal
It is described outer into, the reference audio signal by the processor according to outer noise signal and the reference audio signal generation
Noise signal is generated by the ambient noise being arranged in the first microphone of terminal collection environment.
7. noise cancelling headphone as claimed in claim 6, it is characterised in that the noise cancelling headphone also includes headset plug,
The headset plug is five-part form headset plug, and the headset plug includes from top to bottom：
First segment, is connected for the second microphone with the terminal；
Second section, for being connected to the ground；
Section three, for being connected with right loudspeaker；
Section four, for being connected with left speaker；
Section five, for connecting with the 3rd Mike's wind facies.
8. noise cancelling headphone as claimed in claim 6, it is characterised in that the noise cancelling headphone also includes headset plug,
The headset plug is four-section type headset plug, and the headset plug includes from top to bottom：
First segment, for being connected to the ground；
Second section, for being connected with right loudspeaker；
Section three, for being connected with left speaker；
Section four, it is connected for the second microphone with the terminal.
9. a kind of earphone noise-reduction method, it is characterised in that methods described includes：
Noise in terminal collection environment, and the noise is converted into outer noise signal；
The terminal receives the reference audio signal that noise cancelling headphone sends, and the reference audio signal is obtained according to reference audio
Take, the reference audio is the audio in the ear muff of the second microphone collection being arranged in the ear muff of noise cancelling headphone；
The terminal generates noise compensation signal according to the reference audio signal and the outer noise signal, and according to input
Audio signal and the noise compensation signal generation play signal；
The terminal sends to the noise cancelling headphone play signal, so that the noise cancelling headphone is by the play signal
It is converted into broadcasting audio.
10. method as claimed in claim 9, it is characterised in that the terminal is according to reference audio signal and outer noise
Signal generation noise compensation signal, including：
The terminal uses variable step size adaptive filtering algorithm, according to the reference audio signal and the outer noise signal life
Into the noise compensation signal.
11. methods as claimed in claim 10, it is characterised in that the terminal is filtered using variable-step self-adaptive and calculated
Method, the noise compensation signal is generated according to reference audio signal and outer noise signal, including：
E (n)=d (n)-y (n)=x (n)+N (n)-y (n),
W (the n+1)=λ of w (n)+2 (n) e (n) x (n),
Wherein, n represents sampling instant, and n+1 represents the next sampling instant after n sampling instants, and e (n) is noise school
Positive signal, d (n) is reference audio signal, and y (n) is outer noise signal, and x (n) is input audio signal, and N (n) is ear muff
Interior noise signal, N (n) is directly proportional to outer noise signal y (n), xTN () is the matrix inversion of input audio signal,
W (n) is sef-adapting filter weight coefficient, and λ is step factor, and a and b is variable.
12. method as described in any one of claim 9 to 11, it is characterised in that the terminal is according to input audio
Signal and noise compensation signal generation play signal, including：
The terminal by the input audio signal and the noise compensation Signal averaging and divided by 2 generating the broadcasting
Signal.
13. method as described in any one of claim 9 to 12, it is characterised in that methods described also includes：
The terminal collection input audio, and the input audio is converted into input audio signal.
14. a kind of earphone noise-reduction methods, it is characterised in that methods described includes：
Reference audio in noise cancelling headphone collection ear muff, and the reference audio is converted into reference audio signal；
The noise cancelling headphone sends to terminal the reference audio signal；
The noise cancelling headphone receives the play signal from the noise reduction device of earphone, and the play signal is converted into broadcasts
Playback is frequently；
Wherein, the play signal is given birth to by the processor for being arranged at terminal according to input audio signal and noise compensation signal
It is described outer into, the reference audio signal by the processor according to outer noise signal and the reference audio signal generation
Noise signal is generated by the ambient noise being arranged in the first microphone of terminal collection environment.
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| CN201511024592.1A CN106937190A (en) | 2015-12-29 | 2015-12-29 | Terminal, noise cancelling headphone and earphone noise-reduction method |
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| CN201511024592.1A CN106937190A (en) | 2015-12-29 | 2015-12-29 | Terminal, noise cancelling headphone and earphone noise-reduction method |
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| CN201511024592.1A Pending CN106937190A (en) | 2015-12-29 | 2015-12-29 | Terminal, noise cancelling headphone and earphone noise-reduction method |
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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 |
| CN107948785A (en) * | 2017-10-23 | 2018-04-20 | 歌尔股份有限公司 | Earphone and the method adaptively adjusted to earphone execution |
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| CN111627416A (en) * | 2020-05-13 | 2020-09-04 | 广州国音智能科技有限公司 | Audio noise elimination method, device, equipment and storage medium |
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| CN107507622A (en) * | 2017-08-07 | 2017-12-22 | 维沃移动通信有限公司 | Processing method, mobile terminal and the computer-readable recording medium of voice signal |
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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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| CN111724760A (en) * | 2019-03-21 | 2020-09-29 | 德尔格安全股份两合公司 | Apparatus, system and method for audio signal processing |
| CN111724760B (en) * | 2019-03-21 | 2024-04-26 | 德尔格安全股份两合公司 | Apparatus, system and method for audio signal processing |
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| CN112566004A (en) * | 2020-12-25 | 2021-03-26 | 百度在线网络技术（北京）有限公司 | Wireless earphone, working state monitoring method and device and storage medium |
| CN112566004B (en) * | 2020-12-25 | 2022-07-26 | 百度在线网络技术（北京）有限公司 | Wireless earphone, working state monitoring method and device and storage medium |
| CN112350688A (en) * | 2021-01-07 | 2021-02-09 | 北京欣博电子科技有限公司 | Voice signal clock domain crossing processing method and device and intelligent voice chip |
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