CN105959874A - Mobile terminal and method of reducing audio frequency noise - Google Patents
Mobile terminal and method of reducing audio frequency noise Download PDFInfo
- Publication number
- CN105959874A CN105959874A CN201610289934.0A CN201610289934A CN105959874A CN 105959874 A CN105959874 A CN 105959874A CN 201610289934 A CN201610289934 A CN 201610289934A CN 105959874 A CN105959874 A CN 105959874A
- Authority
- CN
- China
- Prior art keywords
- signal
- audio
- noise
- audio signal
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention relates to the noise reduction technical field, and discloses a mobile terminal and a method of reducing audio frequency noise. The mobile terminal includes an audio frequency power amplifier, a loudspeaker, a microphone and a coding and decoding chip, wherein the coding and decoding chip collects a first audio frequency signal, and the microphone collects a second audio frequency signal and outputs the second audio frequency signal to the coding and decoding chip; the coding and decoding chip respectively extracts a first noise signal and a second noise signal from the first audio frequency signal and the second audio frequency signal, and outputs the first noise signal and the second noise signal into the audio frequency power amplifier; and the audio frequency power amplifier performs compensation treatment on the first audio frequency signal according to the first noise signal and the second noise signal. The method can effectively inhibit the noise on a mobile terminal audio frequency line and the audio frequency noise broadcasted by the loudspeaker, improve outputted audio frequency tone quality and human ear subjective feeling, and furthermore improve user experience.
Description
Technical field
The present invention relates to noise reduction technology field, particularly to a kind of mobile terminal and reduce audio-frequency noise
Method.
Background technology
Owing to mobile terminal brings great convenience to the life of people, utilize mobile terminal playing audio frequency
Also one of major demands becoming users.But, due to the existence of noise so that audio frequency is play
Tonequality can not meet far away the demand of user, causes poor user experience.
Summary of the invention
Present invention solves the problem in that a kind of method mobile terminal being provided and reducing audio-frequency noise, make
Obtain mobile terminal and the audio frequency play can be carried out noise reduction, improve tonequality and the subjectivity of human ear of output audio frequency
Impression, and then improve Consumer's Experience.
For solving above-mentioned technical problem, embodiments of the present invention provide a kind of mobile terminal and reduce audio frequency
The method of noise, described mobile terminal includes audio-frequency power amplifier and speaker；Described mobile terminal is also
Including mike and codec chip；Described mobile terminal reduces the method for audio-frequency noise and comprises the following steps:
Described codec chip gathers the first audio signal, and described mike gathers the second audio signal defeated
Go out to described codec chip；Wherein said first audio signal is the output of described audio-frequency power amplifier
Audio signal；Described second audio signal is the audio frequency that described mike gathers when described speaker operation
Signal；
Described codec chip extracts respectively from described first audio signal, described second audio signal
First noise signal, the second noise signal, and export to described audio-frequency power amplifier；
Described audio-frequency power amplifier according to described first noise signal, described second noise signal to described
First audio signal compensates process.
Embodiments of the present invention additionally provide a kind of mobile terminal, including audio-frequency power amplifier with raise one's voice
Device；Described mobile terminal also includes: mike and codec chip；
Described codec chip, for gathering the first audio signal；Wherein said first audio signal is institute
State the audio signal of audio-frequency power amplifier output；
Described mike, for gathering the second audio signal and exporting to described codec chip；Wherein institute
Stating the second audio signal is the audio signal that described mike gathers when described speaker operation；
Described codec chip, is additionally operable to respectively from described first audio signal, described second audio signal
In extract the first noise signal, the second noise signal, and export to described audio-frequency power amplifier；
Described audio-frequency power amplifier, for according to described first noise signal, described second noise signal
Described first audio signal is compensated process.
Embodiment of the present invention in terms of existing technologies, is to set up mike and volume on mobile terminals
Decoding chip, utilizes codec chip to gather the audio signal of audio-frequency power amplifier output, and utilizes wheat
Gram elegance collection the second audio signal also exports to codec chip, then by codec chip from the signal received
In extract noise signal, and feed back to audio-frequency power amplifier, by audio-frequency power amplifier according to reception
Noise signal the audio signal that audio-frequency power amplifier exports is compensated process, eliminate noise.?
In embodiments of the present invention, mobile terminal not only can eliminate the noise that source of sound itself carries, and improves defeated
Go out the tonequality of audio frequency, it is also possible to eliminate environment noise, improve the subjective feeling of human ear.In a word, the present invention
Embodiment can make mobile terminal that the audio frequency play is carried out noise reduction, improves tonequality and the people of output audio frequency
The subjective feeling of ear, and then improve Consumer's Experience.
Further, described first noise signal includes that make an uproar in the end of described audio-frequency power amplifier and source of sound is taken
The noise of band；Described second noise signal includes that described speaker plays what described first audio signal produced
Noise and environment noise.So, mobile terminal not only can eliminate the end of audio-frequency power amplifier and makes an uproar and sound
The noise that source is carried, it is also possible to eliminate noise and environment noise that speaker playing audio signal produces, carry
The tonequality of high output audio frequency, and then improve Consumer's Experience.
Further, described mike and the distance of described speaker are less than predeterminable range.Mike with raise
The distance of sound device is the nearest, and the audio signal of collection is the most accurate, and then can make mobile terminal farthest
Eliminate noise signal.
Further, after described codec chip gathers the step of the first audio signal, also include:
Described codec chip uses bass boost algorithms to process described first audio signal, and exports to described sound
Frequently power amplifier.As such, it is possible to make mobile terminal reappear the imperceptible audio frequency of human ear, improve mobile
The performance of the audio frequency of terminal output, Consumer's Experience is good.
Further, after described codec chip gathers the step of the first audio signal, also include:
Described codec chip uses the first audio signal described in dynamic filter algorithm process, and exports to described sound
Frequently power amplifier.As such, it is possible to make mobile terminal according to the change of external environmental noise adaptively
Reducing noise, degree of intelligence is high, and is simply easily achieved.
Further, described first audio signal is three-dimensional 3D audio signal；At described codec chip
After gathering the step of the first audio signal, also include: described codec chip uses the 3D preset to calculate
Method processes described first audio signal, and exports to described audio-frequency power amplifier.As such, it is possible to make shifting
Dynamic terminal can not only promote the loudness of sound, even can effectively produce virtual surround sound, uses
Family believes that sound comes from from all directions, can promote Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the mobile terminal structure schematic diagram according to the first embodiment；
Fig. 2 is the mobile terminal structure schematic diagram according to the second embodiment；
Fig. 3 is the method flow diagram that the mobile terminal according to the 3rd embodiment reduces audio noise；
Fig. 4 is the theory diagram of the mobile terminal reduction audio noise of the 4th embodiment；
Fig. 5 is the method flow diagram that the mobile terminal according to the 4th embodiment reduces audio noise；
Fig. 6 is the frequency road response curve using bass boost algorithms in the 5th embodiment；
Fig. 7 is the schematic block circuit diagram of dynamic filter algorithm in the 6th embodiment.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this
Bright each embodiment is explained in detail.But, it will be understood by those skilled in the art that
In each embodiment of the present invention, propose many technology to make reader be more fully understood that the application thin
Joint.But, even if there is no these ins and outs and many variations based on following embodiment and amendment,
The application each claim technical scheme required for protection can also be realized.
First embodiment of the present invention relates to a kind of mobile terminal, as shown in Figure 1.
Mobile terminal in present embodiment includes audio-frequency power amplifier 103, mike 101, compiles solution
Code chip 102 and speaker (not shown).
Codec chip 102 is for gathering the first audio signal, and wherein the first audio signal is audio power
The audio signal of amplifier 103 output.Mike 101 is for gathering the second audio signal and exporting to compiling
Decoding chip 102, wherein the second audio signal is the audio frequency that mike 101 gathers when speaker operation
Signal.Codec chip 102 is additionally operable to extract from the first audio signal, the second audio signal respectively
First noise signal, the second noise signal, and export to audio-frequency power amplifier 103.Audio power is put
Big device 103 is for compensating place according to the first noise signal, the second noise signal to the first audio signal
Reason.
Present embodiment in terms of existing technologies, is set up mike 101 on mobile terminals and is solved with compiling
Code chip 102, utilizes codec chip 102 to gather the audio signal of audio-frequency power amplifier 103 output,
And utilize mike 101 gather the second audio signal and export to codec chip 102, then by encoding and decoding
Chip 102 extracts noise signal from the signal received, and feeds back to audio-frequency power amplifier 103,
The sound according to the noise signal received, audio-frequency power amplifier 103 exported by audio-frequency power amplifier 103
Frequently signal compensates process, eliminates noise.In embodiments of the present invention, mobile terminal not only may be used
To eliminate the noise that source of sound itself carries, improve the tonequality of output audio frequency, it is also possible to eliminate environment noise,
Improve the subjective feeling of human ear.In a word, embodiment of the present invention can make the mobile terminal audio frequency to playing
Carry out noise reduction, improve tonequality and the subjective feeling of human ear of output audio frequency, and then improve Consumer's Experience.
Second embodiment of the present invention relates to a kind of mobile terminal.In the present embodiment, encoding and decoding core
Sheet 102 includes analog-digital converter 1021 and digital signal processor 1022, as shown in Figure 2.
In the present embodiment, codec chip 102 gathers the first audio signal, wherein the first audio frequency letter
It number it is the audio signal of audio-frequency power amplifier 103 output.Mike 101 gathers the second audio signal also
Output is to codec chip 102, and wherein the second audio signal is that mike 101 is adopted when speaker operation
The audio signal of collection.First audio signal, the second audio signal are respectively converted into by analog-digital converter 1021
First digital signal, the second digital signal, and export to digital signal processor 1022.At digital signal
Reason device 1022 extract from the first digital signal, the second digital signal respectively the first noise signal, second
Noise signal, and export to audio-frequency power amplifier 103.Then audio-frequency power amplifier 103 is according to
One noise signal, the second noise signal compensate process to the first audio signal.
Needing to say, the first noise signal in present embodiment includes audio-frequency power amplifier 103
Make an uproar the noise carried with source of sound in the end.Second noise signal includes that speaker plays what the first audio signal produced
Noise and environment noise.
In the present embodiment, can be by the distance between mike 101 and speaker less than predeterminable range.
Such as, mike 101 can be arranged on the side of speaker, such that it is able to make the audio frequency of collection believe
Number more accurate, and then mobile terminal can be made farthest to eliminate noise signal.
Specifically, owing to, inside mobile terminal, using the process put the music on or converse outside speaker
In, all there is noise, present embodiment, for this problem, is selected with digital signal processor (DSP)
The codec chip (Codec) 102 of 1022, utilizes analog-digital converter 1021 to gather the signal on circuit,
After carrying out keeping, sampling, quantify, output is optimized process to digital signal processor 1022.It addition,
It is placed around mike (MIC) 101 at speaker, for receiving the sound that speaker broadcasts, also by
Analog-digital converter 1021 exports and processes to digital signal processor 1022, digital signal processor 1022
Utilize noise that algorithm extracts on circuit and the noise that speaker broadcasts, feed back to audio-frequency power amplifier
103, in order to compensating audio, noise is had certain inhibitory action, concurrently facilitates raising tonequality.
As can be seen here, the mobile terminal of present embodiment not only can eliminate audio-frequency power amplifier 103
Making an uproar the noise carried with source of sound in the end, it is also possible to eliminates the noise that speaker playing process sound intermediate frequency signal produces
With environment noise, farthest improve the tonequality of output audio frequency, and then improve Consumer's Experience.
Third embodiment of the present invention relates to a kind of method that mobile terminal reduces audio-frequency noise, is applied to
The mobile terminal of first, second embodiment, the idiographic flow of present embodiment is as shown in Figure 3.
In step 301, codec chip gathers the first audio signal.Wherein the first audio signal is sound
The audio signal of power amplifier output frequently.
In step 302, mike gathers the second audio signal and exports to codec chip.Wherein,
Second audio signal is the audio signal that mike gathers when speaker operation.
In step 303, codec chip extracts respectively from the first audio signal, the second audio signal
Go out the first noise signal, the second noise signal.
In step 304, the first noise signal, the second noise signal are exported to audio-frequency power amplifier.
In step 305, audio-frequency power amplifier according to the first noise signal, the second noise signal to
One audio signal compensates process.
In terms of existing technologies, it is to set up mike and codec chip on mobile terminals, utilizes
Codec chip gathers the audio signal of audio-frequency power amplifier output, and utilizes mike to gather the second sound
Frequently signal exporting to codec chip, then from the signal received, extracted noise letter by codec chip
Number, and feed back to audio-frequency power amplifier, by audio-frequency power amplifier according to the noise signal received to sound
The audio signal of power amplifier output frequently compensates process, eliminates noise.Embodiment party in the present invention
In formula, mobile terminal not only can eliminate the noise that source of sound itself carries, and improves the tonequality of output audio frequency,
Environment noise can also be eliminated, improve the subjective feeling of human ear.In a word, embodiment of the present invention can make
Mobile terminal carries out noise reduction to the audio frequency play, and improves tonequality and the subjective feeling of human ear of output audio frequency,
And then raising Consumer's Experience.
It is seen that, present embodiment is the embodiment of the method corresponding with the first embodiment, this enforcement
Mode can be worked in coordination enforcement with the first embodiment.The relevant technical details mentioned in first embodiment
The most effective, in order to reduce repetition, repeat no more here.Correspondingly, this enforcement
The relevant technical details mentioned in mode is also applicable in the first embodiment.
4th embodiment of the present invention relates to a kind of method that mobile terminal reduces audio-frequency noise.This enforcement
In mode, (in figure, L is inductance to the circuit structure of mobile terminal reduction audio-frequency noise, and C is as shown in Figure 4
Electric capacity), the outfan at audio-frequency power amplifier places codec chip, inside codec chip
Digital signal processor to collect signal process, wherein collect signal include sound
Frequently the signal that the signal on circuit and mike receive, then by audio-frequency power amplifier to process after
Signal compensate process, thus reach to suppress noise, improve the effect of tonequality.
Signal and the signal of mike reception on voice band line are delivered to digital signal after analog digital conversion
Processing in processor, makes an uproar and source of sound itself in the end optimization of circuit noise being primarily directed to audio frequency power amplifier
Noise (subjective feeling of human ear) carry out the optimization on algorithm, on the extracting method of noise, permissible
The method using wavelet transformation, owing to the wavelet coefficient of primary signal and noise has not on different scale
Congeniality, therefore can construct corresponding rule, mixed signal is divided into multiple voiced band, extracts little
Wave system number, then the threshold value of each band noise coefficient is processed, extract the little of frequency band corresponding to noise
Wave conversion coefficient carries out inverse wavelet transform, then re-synthesizing signals, can reduce us to greatest extent
Required signal, reaches the effect of noise reduction.
In present embodiment, mobile terminal reduces the idiographic flow of the method for audio-frequency noise as shown in Figure 5.
In step 501, codec chip gathers the first audio signal.Specifically, the first noise letter
Number include making an uproar the noise carried with source of sound in the end of audio-frequency power amplifier.
In step 502, mike gathers the second audio signal and exports to codec chip.Concrete
Saying, the second noise signal includes that speaker plays noise and the environment noise that the first audio signal produces.?
Can be by the distance between mike and speaker less than predeterminable range in actual application, in order to make collection
Audio signal is more accurate.Such as, mike can be located at the side of speaker, and then shifting can be made
Dynamic terminal farthest eliminates noise signal.
In step 503, the first audio signal, the second audio signal are respectively converted into by analog-digital converter
First digital signal, the second digital signal.Present embodiment use analog-digital converter audio signal turned
The technology being changed to digital signal is existing mature technology, does not repeats them here.
In step 504, the first digital signal, the second digital signal are exported to digital signal processor.
Specifically, can be by analog-digital converter by the first digital signal, the second digital signal output extremely numeral
Signal processor.
In step 505, digital signal processor is respectively from the first digital signal, the second digital signal
Extract the first noise signal, the second noise signal.Specifically, present embodiment can use little
Wave conversion method is extracted the first noise signal respectively from the first digital signal, the second digital signal, second is made an uproar
Acoustical signal.
The Wavelet Transform specific algorithm used in present embodiment is as follows:
If Ψ (t) is ∈ L2(R), (Ψ (t) is the first audio signal, and t is the time, L2(R) square integrable is represented
Space, i.e. the signal space of finite energy), its Fourier transform is
WhenWhen meeting the permissive condition described in (4.1) formula, we Ψ (ω) is called a wavelet
Or morther wavelet (Mother Wavelet)；ω is frequency.By mother wavelet function Ψ (t) through stretching and after translation,
Can be obtained by a wavelet sequence.For continuous situation, wavelet sequence is:
Wherein, a is contraction-expansion factor；B is shift factor；For the energy normalized factor.
So for either signalContinuous wavelet transform
(CWT) it is defined as:
It is inversely transformed into:
But in actual application, it is necessary to continuous wavelet in addition discretization.This discretization is both for even
Continuous scale parameter a and continuous translation parameter b rather than for time variable t, this and other
The discretization of form is different.In continuous wavelet, it is considered to function (4.2):
Here, a, b ∈ R；A ≠ 0 and Ψ allow, for convenience, limit a in discretization
Take on the occasion of, then admissible condition becomes:
Generally, the discretization formula of the scale factor in continuous wavelet transform and shift factor is:
Here, j ∈ Z, extend step-length a0≠ 1 is fixed value, and supposes a01.
Its reconstruction formula is:
Wherein, C is a constant unrelated with signal.
But, how to select a0And b0The precision that can ensure reconstruction signal is very important, it is clear that
The closeest (the i.e. a of mesh point0And b0The least), because if mesh point is the most sparse, the small echo letter of use
Number Ψj,k(t) and discrete wavelet coefficient Cj,kThe fewest, signal reconstruction degree of accuracy also will be the lowest.It addition, threshold
Choosing of value is also a critically important aspect.
Make cd (j) andBeing respectively the high frequency coefficient before and after threshold value quantizing, λ is the threshold value set.
Wherein α is for estimating the factor, and this is the compromise method of a kind of soft and hard threshold, and the method can preferably reach
To the effect of noise reduction, i.e. extract noise.
First can be extracted from the first audio signal, the second audio signal by step 503-505 to make an uproar
Acoustical signal, the second noise signal, i.e. " codec chip is respectively from the first audio signal, the second audio frequency letter
Extract the first noise signal, the second noise signal in number " implement.
In step 506, the first noise signal, the second noise signal are exported to audio-frequency power amplifier.
Specifically, by digital signal processor, the first noise signal, the second noise signal can be exported extremely
Audio-frequency power amplifier.
In step 507, audio-frequency power amplifier according to the first noise signal, the second noise signal to
One audio signal compensates process.Specifically, audio frequency controller amplifier according to the first noise signal,
The wave characteristics of the second noise signal, then calculates anti-phase ripple by the built-in chip that processes, then leads to
Too high reduction degree speaker offsets, thus the first audio signal is compensated process.
It is seen that, present embodiment is the embodiment of the method corresponding with the second embodiment, therefore originally
Embodiment can be worked in coordination enforcement with the second embodiment.The correlation technique mentioned in second embodiment
Details is the most effective, and the technique effect that can reach in this second embodiment is at this
Too it is achieved that in order to reduce repetition, repeat no more here in embodiment.Correspondingly, this reality
Execute the relevant technical details mentioned in mode to be also applicable in the second embodiment.
Present embodiment arranges the mechanism of detection noise at audio frequency by playing on circuit, feed back, can
With the real-time output for regulating system audio, mike auxiliary reception environment noise and speaker simultaneously
Noise, by the noise signal in wavelet noise algorithm separating audio, simple, rapid, accurate, then
The noise signal extracted is fed back to audio-frequency power amplifier, then audio frequency is compensated, improve tonequality
And the subjective feeling of human ear.
5th embodiment of the present invention relates to a kind of method that mobile terminal reduces audio noise.5th is real
Mode of executing is improved on the basis of the 3rd embodiment, thes improvement is that: in the present embodiment,
When first audio signal is processed by codec chip, bass boost algorithms is also used to process, excellent
Change audio frequency effect, improve tonequality.
Specifically, high speed technology (3G/4G) and the supporting network thereof of mobile communication achieves mobile terminal sound
Frequency and the download function of video and playback function.Therefore, user, while hope more high bandwidth, also wishes
Prestige can have more preferable Voice & Video quality to enjoy.
Speaker converts electrical energy into sound wave by movable barrier film.Barrier film promotes air, produces sound wave,
It is converted into sound via our ear.In the terminal, the size leaving mobile phone speaker for is the least,
The audio frequency effect reached is the most very limited, wants to optimize audio frequency effect, improves tonequality, can only calculate from audio frequency
Method is gone consider.Basic handling algorithm is to filter different frequency bands amplitude variations by equalizer, thus overcomes
The defect of speaker.
Present embodiment is intended using bass boost algorithms to carry out speaker in codec chip (Codec)
The improvement of tonequality, this algorithm improves by utilizing the psychoacoustic principles of missing fundamental (missing fundamental)
The reproduction of bass frequencies.The frequency response of miniature loudspeaker is 3dB, and scope reaches hundreds of hertz, for
For miniature loudspeaker, low frequency cannot present, because low frequency will force speaker to make to exceed
The movement of its limit of power, eventually causes more distortion to higher frequency.
Bass boost algorithms is by drawing the bass frequencies that speaker cannot reappear, then bass frequencies is raised
The frequency that one frequency multiplication can present to speaker, as shown in Figure 6, in figure 601 be missing fundamental
Big frequency, 602 is the harmonic frequency increased, and 603 is speaker frequency response plot.Such as: assume to raise
Sound device is 3dB on 300Hz point, and plays content and be only 200Hz, and at this moment it will be carried by bass boost
It is raised to 400Hz so that it is play.It is 8 degree of sounds in view of audio content, the ear of people and brain meeting
It is induced to think and has heard low-frequency content (missing fundamental principle).So, we just can use wave filter
Removing all these bass content that can not be reproduced makes it cannot arrive speaker.Bass boost and height
The synchronization of bandpass filter uses and will can significantly improve the bass reproduction capability of miniature loudspeaker.
In the present embodiment, codec chip uses bass boost algorithms to process the first audio signal, and
Output is to audio-frequency power amplifier.As such, it is possible to make mobile terminal reappear the imperceptible audio frequency of human ear,
Improving the performance of the audio frequency of mobile terminal output, Consumer's Experience is good.
6th embodiment of the present invention relates to a kind of method that mobile terminal reduces audio noise.6th is real
Mode of executing is improved on the basis of the 3rd embodiment, thes improvement is that: in the present embodiment,
When first audio signal is processed by codec chip, dynamic filter algorithm is also used to process, and
Output is to audio-frequency power amplifier.Optimize audio frequency effect, improve tonequality.
Specifically, by observing the frequency response of speaker, it is judged that the bass frequencies that cannot reappear,
Then equalizer curve can correspondingly be designed, such that it is able to obtain the audio frequency with uniform amplitude.But
Speaker has the frequency response changed along with the power of audio signal, it is possible to use dynamically
Algorithm filter, the frequency response of speaker can change along with signal amplitude, and these wave filter
Pole and zero also can change with its change.Present embodiment can use adaptive algorithm (LMS)
Realizing, schematic diagram is as shown with 7.
In figure, X (n) is the input signal of sef-adapting filter, and the shock response of sef-adapting filter is
H (n), or it is called filtering parameter.Sef-adapting filter output signal is Y (n), desired response letter
Number being d (n), error signal e (n) is the difference of d (n) and Y (n), can be drawn by comparator.In this enforcement
In mode, it is desirable to response signal d (n) can select according to different purposes, sef-adapting filter defeated
Going out signal Y (n) to estimate Expected Response signal d (n), self-adaptative adjustment module uses adaptive algorithm
(LMS) (The least Mean square, least mean-square error) is adjusted automatically according to error signal e (n)
Entire filter wave parameter, the estimated value of the Y (n) exported after making filtered processEqual to desired response
d(n).Therefore, sef-adapting filter is different from general filter, and its shock response or filtering parameter are
Changing with the change of external environment condition, the convergence time through one section of automatic adjustment reaches optimum filtering
Requirement.The most why select adaptive algorithm algorithm, be primarily due to it simply effectively, be more suitable for
Voice is detected.
In present embodiment, codec chip uses dynamic filter algorithm process the first audio signal, and defeated
Go out to audio-frequency power amplifier.As such, it is possible to make mobile terminal according to the change of external environmental noise certainly
Adaptively reducing noise, degree of intelligence is high, and is simply easily achieved.
7th embodiment of the present invention relates to a kind of method that mobile terminal reduces audio noise.7th is real
Mode of executing is improved on the basis of the 3rd embodiment, thes improvement is that: in the present embodiment,
First audio signal can be three-dimensional 3D audio signal, and codec chip uses the 3D algorithm process preset
First audio signal, and export to audio-frequency power amplifier.Meet user for higher level tonequality effect
The pursuit of fruit.
Present embodiment, by creating immersion audio experience, enhances and plays out via speaker or earphone
The audio frequency come.It can not only promote the loudness of sound, and small portable device even can be allowed effectively to produce
Virtual surround sound.This algorithm audio frequency to playing back via the stereophonic sound system dual pathways has carried out different
Same point analysis, and the audio frequency played back by the stereophonic sound system dual pathways is strengthened, so that user
Believe that sound comes from from all directions.This algorithm make use of human brain to be correlated with translation function (HRTF), and it is explained
How sound interacts with human brain, ear, brain system and how to be annotated by human brain.
Present embodiment can make mobile terminal can not only promote the loudness of sound, even can effectively produce
Going out virtual surround sound, sound comes from from all directions to make user believe, meets user for higher
The pursuit of secondary acoustical quality, promotes Consumer's Experience.
The step of the most various methods divides, and is intended merely to describe clear, it is achieved time can merge into one
Step or split some step, is decomposed into multiple step, as long as including identical logical relation,
All in the protection domain of this patent；To adding inessential amendment in algorithm or in flow process or drawing
Enter inessential design, but do not change the core design of its algorithm and flow process all at the protection model of this patent
In enclosing.
It will be understood by those skilled in the art that the respective embodiments described above are realize the present invention concrete
Embodiment, and in actual applications, can to it, various changes can be made in the form and details, and the most inclined
From the spirit and scope of the present invention.
Claims (12)
1. the method that mobile terminal reduces audio-frequency noise, described mobile terminal includes that audio power is put
Big device and speaker；It is characterized in that, described mobile terminal also includes mike and codec chip；Institute
The method stating mobile terminal reduction audio-frequency noise comprises the following steps:
Described codec chip gathers the first audio signal, and described mike gathers the second audio signal defeated
Go out to described codec chip；Wherein said first audio signal is the output of described audio-frequency power amplifier
Audio signal；Described second audio signal is the audio frequency that described mike gathers when described speaker operation
Signal；
Described codec chip extracts respectively from described first audio signal, described second audio signal
First noise signal, the second noise signal, and export to described audio-frequency power amplifier；
Described audio-frequency power amplifier according to described first noise signal, described second noise signal to described
First audio signal compensates process.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described
One noise signal includes making an uproar the noise carried with source of sound in the end of described audio-frequency power amplifier；
Described second noise signal includes that described speaker plays the noise that described first audio signal produces
With environment noise.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described wheat
The distance of gram wind and described speaker is less than predeterminable range.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described volume
Decoding chip includes digital signal processor and analog-digital converter；
Extract from described first audio signal, described second audio signal respectively at described codec chip
Go out in the step of the first noise signal, the second noise signal, specifically include:
Described first audio signal, described second audio signal are respectively converted into by described analog-digital converter
One digital signal, the second digital signal, and export to described digital signal processor；
Described digital signal processor carries respectively from described first digital signal, described second digital signal
Take out described first noise signal, described second noise signal.
The method of reduction audio-frequency noise the most according to claim 4, it is characterised in that described
Digital signal processor extracts first respectively from described first digital signal, described second digital signal
Noise signal, the second noise signal step in, specifically include:
Wavelet Transform is used to extract institute respectively from described first digital signal, described second digital signal
State the first noise signal, described second noise signal.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described
After codec chip gathers the step of the first audio signal, also include:
Described codec chip uses bass boost algorithms to process described first audio signal, and exports to institute
State audio-frequency power amplifier.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described
After codec chip gathers the step of the first audio signal, also include:
Described codec chip uses the first audio signal described in dynamic filter algorithm process, and exports to institute
State audio-frequency power amplifier.
The method of reduction audio-frequency noise the most according to claim 1, it is characterised in that described
One audio signal is three-dimensional 3D audio signal；
After described codec chip gathers the step of the first audio signal, also include:
Described codec chip uses the first audio signal described in the 3D algorithm process preset, and exports extremely
Described audio-frequency power amplifier.
9. a mobile terminal, including audio-frequency power amplifier and speaker；It is characterized in that, described
Mobile terminal also includes: mike and codec chip；
Described codec chip, for gathering the first audio signal；Wherein said first audio signal is institute
State the audio signal of audio-frequency power amplifier output；
Described mike, for gathering the second audio signal and exporting to described codec chip；Wherein institute
Stating the second audio signal is the audio signal that described mike gathers when described speaker operation；
Described codec chip, is additionally operable to respectively from described first audio signal, described second audio signal
In extract the first noise signal, the second noise signal, and export to described audio-frequency power amplifier；
Described audio-frequency power amplifier, for according to described first noise signal, described second noise signal
Described first audio signal is compensated process.
Mobile terminal the most according to claim 9, it is characterised in that described first noise signal
Make an uproar the noise carried with source of sound including the end of described audio-frequency power amplifier；
Described second noise signal includes that described speaker plays the noise that described first audio signal produces
With environment noise.
11. mobile terminals according to claim 9, it is characterised in that described mike is with described
Distance between speaker is less than predeterminable range.
12. mobile terminals according to claim 9, it is characterised in that described codec chip bag
Include analog-digital converter and digital signal processor；
Described analog-digital converter, for turning described first audio signal, described second audio signal respectively
It is changed to the first digital signal, the second digital signal, and exports to described digital signal processor；
Described digital signal processor, for respectively from described first digital signal, described second numeral letter
Described first noise signal, described second noise signal is extracted in number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610289934.0A CN105959874A (en) | 2016-05-04 | 2016-05-04 | Mobile terminal and method of reducing audio frequency noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610289934.0A CN105959874A (en) | 2016-05-04 | 2016-05-04 | Mobile terminal and method of reducing audio frequency noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105959874A true CN105959874A (en) | 2016-09-21 |
Family
ID=56914558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610289934.0A Pending CN105959874A (en) | 2016-05-04 | 2016-05-04 | Mobile terminal and method of reducing audio frequency noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105959874A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107644649A (en) * | 2017-09-13 | 2018-01-30 | 黄河科技学院 | A kind of signal processing method |
| CN108156555A (en) * | 2016-12-02 | 2018-06-12 | 中车株洲电力机车研究所有限公司 | A kind of train active noise reduction system and method |
| CN108574892A (en) * | 2018-06-29 | 2018-09-25 | 歌尔科技有限公司 | Sound pick-up, pick up facility and the method for eliminating noise |
| CN109391870A (en) * | 2018-11-10 | 2019-02-26 | 东莞市华睿电子科技有限公司 | A method of it is played based on human motion state self-regulation earpiece audio signal |
| CN110053041A (en) * | 2018-04-13 | 2019-07-26 | 吕泉晔 | A kind of robot remote control system |
| CN110379440A (en) * | 2019-07-19 | 2019-10-25 | 宁波奥克斯电气股份有限公司 | Voice de-noising method, device, voice air conditioner and computer readable storage medium |
| WO2020051769A1 (en) * | 2018-09-11 | 2020-03-19 | 深圳市汇顶科技股份有限公司 | Active noise cancelling method and headset |
| CN110896420A (en) * | 2018-09-12 | 2020-03-20 | 中兴通讯股份有限公司 | Current sound eliminating method and device and storage medium |
| CN111083250A (en) * | 2018-10-22 | 2020-04-28 | 中兴通讯股份有限公司 | Mobile terminal and noise reduction method thereof |
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN117805662A (en) * | 2024-02-26 | 2024-04-02 | 深圳市拓湃新能源科技有限公司 | Battery parameter processing method, device, equipment and storage medium |
| CN117805662B (en) * | 2024-02-26 | 2024-06-11 | 深圳市拓湃新能源科技有限公司 | Battery parameter processing method, device, equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342386A (en) * | 1998-09-04 | 2002-03-27 | Srs实验室公司 | Low-frequency audio enhancement system |
| CN101511047A (en) * | 2009-03-16 | 2009-08-19 | 东南大学 | Three-dimensional sound effect processing method for double track stereo based on loudspeaker box and earphone separately |
| CN103686501A (en) * | 2012-09-05 | 2014-03-26 | 深圳市凯聚源科技有限公司 | Noise cancelling bluetooth headset |
| CN104602155A (en) * | 2015-01-14 | 2015-05-06 | 中山市天键电声有限公司 | Wireless noise reduction earphone based on intelligent mobile terminal |
| US9183845B1 (en) * | 2012-06-12 | 2015-11-10 | Amazon Technologies, Inc. | Adjusting audio signals based on a specific frequency range associated with environmental noise characteristics |
| CN205195953U (en) * | 2015-07-28 | 2016-04-27 | 东莞市东源音响灯光工程有限公司 | Noise suppression disturbs audio circuit |
-
2016
- 2016-05-04 CN CN201610289934.0A patent/CN105959874A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342386A (en) * | 1998-09-04 | 2002-03-27 | Srs实验室公司 | Low-frequency audio enhancement system |
| CN101511047A (en) * | 2009-03-16 | 2009-08-19 | 东南大学 | Three-dimensional sound effect processing method for double track stereo based on loudspeaker box and earphone separately |
| US9183845B1 (en) * | 2012-06-12 | 2015-11-10 | Amazon Technologies, Inc. | Adjusting audio signals based on a specific frequency range associated with environmental noise characteristics |
| CN103686501A (en) * | 2012-09-05 | 2014-03-26 | 深圳市凯聚源科技有限公司 | Noise cancelling bluetooth headset |
| CN104602155A (en) * | 2015-01-14 | 2015-05-06 | 中山市天键电声有限公司 | Wireless noise reduction earphone based on intelligent mobile terminal |
| CN205195953U (en) * | 2015-07-28 | 2016-04-27 | 东莞市东源音响灯光工程有限公司 | Noise suppression disturbs audio circuit |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108156555A (en) * | 2016-12-02 | 2018-06-12 | 中车株洲电力机车研究所有限公司 | A kind of train active noise reduction system and method |
| CN107644649B (en) * | 2017-09-13 | 2022-06-03 | 黄河科技学院 | Signal processing method |
| CN107644649A (en) * | 2017-09-13 | 2018-01-30 | 黄河科技学院 | A kind of signal processing method |
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN110053041A (en) * | 2018-04-13 | 2019-07-26 | 吕泉晔 | A kind of robot remote control system |
| CN108574892A (en) * | 2018-06-29 | 2018-09-25 | 歌尔科技有限公司 | Sound pick-up, pick up facility and the method for eliminating noise |
| CN108574892B (en) * | 2018-06-29 | 2024-04-02 | 歌尔科技有限公司 | Sound pick-up, sound pick-up equipment and noise eliminating method |
| WO2020051769A1 (en) * | 2018-09-11 | 2020-03-19 | 深圳市汇顶科技股份有限公司 | Active noise cancelling method and headset |
| CN110896420A (en) * | 2018-09-12 | 2020-03-20 | 中兴通讯股份有限公司 | Current sound eliminating method and device and storage medium |
| CN110896420B (en) * | 2018-09-12 | 2022-06-21 | 中兴通讯股份有限公司 | Current sound eliminating method and device and storage medium |
| CN111083250A (en) * | 2018-10-22 | 2020-04-28 | 中兴通讯股份有限公司 | Mobile terminal and noise reduction method thereof |
| CN109391870A (en) * | 2018-11-10 | 2019-02-26 | 东莞市华睿电子科技有限公司 | A method of it is played based on human motion state self-regulation earpiece audio signal |
| CN110379440A (en) * | 2019-07-19 | 2019-10-25 | 宁波奥克斯电气股份有限公司 | Voice de-noising method, device, voice air conditioner and computer readable storage medium |
| CN117805662A (en) * | 2024-02-26 | 2024-04-02 | 深圳市拓湃新能源科技有限公司 | Battery parameter processing method, device, equipment and storage medium |
| CN117805662B (en) * | 2024-02-26 | 2024-06-11 | 深圳市拓湃新能源科技有限公司 | Battery parameter processing method, device, equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105959874A (en) | Mobile terminal and method of reducing audio frequency noise | |
| CN103460716B (en) | For the method and apparatus of Audio Signal Processing | |
| TWI543149B (en) | Noise cancellation method | |
| WO2018227902A1 (en) | Multi-channel echo cancellation circuit and method, and smart device | |
| JP4986182B2 (en) | Acoustic processing system, method and mobile phone terminal for electronic equipment | |
| CN102761643A (en) | Audio headset integrated with microphone and headphone | |
| CN106716526A (en) | Method and apparatus for enhancing sound sources | |
| KR20130108063A (en) | Multi-microphone robust noise suppression | |
| WO2006017993A1 (en) | A background noise eliminate device and method for speech communication terminal | |
| CN110782912A (en) | Sound source control method and speaker device | |
| CN103517183B (en) | Method and device for strengthening subwoofer signals | |
| CN102149034A (en) | Sound enhancement apparatus and method | |
| CN102223428A (en) | Noise reducing method and mobile terminal | |
| CN1533665A (en) | Echo canceller having nonlinear echo suppressor for harmonics calculations | |
| CN108401204A (en) | A kind of novel active noise reduction earphone | |
| CN107889007B (en) | Active noise reduction method and system for eliminating influence of noise reduction channel on playing sound | |
| CN201054780Y (en) | Automatic noise reduction earphone | |
| CN112037810B (en) | Echo processing method, device, medium and computing equipment | |
| CN1538784B (en) | Audible signal processing device and its method | |
| CN108510997A (en) | Electronic equipment and echo cancel method applied to electronic equipment | |
| CN110972007A (en) | Active earphone noise reduction method suitable for ship high-noise scene | |
| US8700391B1 (en) | Low complexity bandwidth expansion of speech | |
| US10937409B2 (en) | Predictive acoustic echo cancellation | |
| CN207022188U (en) | A kind of multi-channel echo eliminates circuit and smart machine | |
| CN102272833A (en) | An audio equipment and a signal processing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160921 |
|
| RJ01 | Rejection of invention patent application after publication |