CN107393551A - Audio defeat method and device - Google Patents
Audio defeat method and device Download PDFInfo
- Publication number
- CN107393551A CN107393551A CN201710661979.0A CN201710661979A CN107393551A CN 107393551 A CN107393551 A CN 107393551A CN 201710661979 A CN201710661979 A CN 201710661979A CN 107393551 A CN107393551 A CN 107393551A
- Authority
- CN
- China
- Prior art keywords
- time point
- signal
- amplitude
- signal amplitude
- noise reduction
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The embodiment of the present invention provides a kind of audio defeat method and device, and this method includes：Pending audio signal is obtained, and processing is filtered to this audio signal, to generate and the equivalent anti-phase noise reduction control signal of audio signal.When will detect that the signal amplitude sometime put in this noise reduction control signal meets that amplitude limit starts threshold value, then start limiter, attenuation processing is carried out to signal amplitude corresponding to the time point after this time point.By one of condition to be reached of uttering long and high-pitched sounds is exactly that signal amplitude reaches certain numerical value, and signal amplitude corresponding to the time point after reducing first time point can then destroy the condition uttered long and high-pitched sounds, so as to avoid the generation uttered long and high-pitched sounds.Finally, then noise reduction control signal by attenuation processing is exported, the noise reduction control signal after this attenuation processing and noise signal is overlapped to realize the noise reduction to pending audio signal.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of audio defeat method and device.
Background technology
For sound equipment, earphone has many advantages, for example, good portability, privacy are high and for people around
The influence of group is smaller etc..
Wearer can produce a certain degree of pressing when wearing earphone to earphone, and this pressing can draw to whole earphone system
Enter a very big disturbance, the disturbance of introducing is possible to be formed in earphone and uttered long and high-pitched sounds.Once generation of uttering long and high-pitched sounds may in earphone
Injury can be brought to the hearing of wearer, therefore, it may be desirable to avoid the generation uttered long and high-pitched sounds.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of audio defeat method and device, passes through the control signal to input
Carry out amplitude limit so that control signal can not meet the condition uttered long and high-pitched sounds so that earphone avoids uttering long and high-pitched sounds.
The embodiment of the present invention provides a kind of audio defeat method, including：
Obtain pending audio signal；
Processing is filtered to the audio signal, to generate noise reduction control signal；
For the noise reduction control signal of first time point be present, to first time point in the noise reduction control signal it
Signal amplitude corresponding to time point afterwards carries out attenuation processing, wherein, signal amplitude corresponding to the first time point meets limit
Width starts threshold value；
Noise reduction control signal after output attenuatoin processing, to be carried out by the noise reduction control signal to the audio signal
Noise reduction process.
Alternatively, signal amplitude corresponding to the time point to after the first time point carries out attenuation processing, bag
Include：
Each time point between first time point and the second time point corresponding signal amplitude is carried out attenuation processing and
Attenuation processing, second time point and described the are carried out to signal amplitude corresponding to the time point after second time point
Signal amplitude corresponding to each time point between one time point meets that the amplitude limit starts threshold value, after second time point
Signal amplitude corresponding to time point is unsatisfactory for the amplitude limit and starts threshold value.
Alternatively, corresponding signal amplitude of each time point between first time point and the second time point declines
Subtract processing, including：
With the first pad value to each time point between the first time point and the second time point corresponding signal amplitude
Carry out attenuation processing.
Alternatively, corresponding signal amplitude of each time point between first time point and the second time point declines
Subtract processing, including：
The limit is exceeded according to each time point between the first time point and the second time point corresponding signal amplitude
Width starts the degree of threshold value, it is determined that the second pad value of signal amplitude matching corresponding with each time point；
With the second pad value of signal amplitude matching corresponding with each time point to letter corresponding to each time point
Number amplitude carries out attenuation processing.
Alternatively, signal amplitude corresponding to the time point to after second time point carries out attenuation processing, bag
Include：
Using the pad value of signal amplitude corresponding with second time point matching as initial value, to preset attenuation steps pair
Signal amplitude corresponding to time point after second time point progressively carries out attenuation processing, until pad value be reduced to it is default
Value.
The embodiment of the present invention provides a kind of audio defeat device, including：
Acquisition module, for obtaining pending audio signal；
Filtration module, for being filtered processing to the audio signal, to generate noise reduction control signal；
Clipping module, for for the noise reduction control signal of first time point be present, to the noise reduction control signal
Signal amplitude corresponding to time point after middle first time point carries out attenuation processing, wherein, corresponding to the first time point
Signal amplitude meets that amplitude limit starts threshold value；
Output module, for output attenuatoin handle after noise reduction control signal, with by the noise reduction control signal to institute
State audio signal and carry out noise reduction process.
Alternatively, the clipping module is specifically used for：
Attenuation processing is carried out to each time point between first time point and the second time point corresponding signal amplitude；
Attenuation processing, second time point are carried out to signal amplitude corresponding to the time point after second time point
Each time point between the first time point corresponding signal amplitude meets that the amplitude limit starts threshold value, second time
Signal amplitude corresponding to time point after point is unsatisfactory for the amplitude limit and starts threshold value.
Alternatively, the clipping module is specifically used for：
With the first pad value to each time point between the first time point and the second time point corresponding signal amplitude
Carry out attenuation processing.
Alternatively, the clipping module is specifically additionally operable to：
The limit is exceeded according to each time point between the first time point and the second time point corresponding signal amplitude
Width starts the degree of threshold value, it is determined that the second pad value of signal amplitude matching corresponding with each time point；
With the second pad value of signal amplitude matching corresponding with each time point to letter corresponding to each time point
Number amplitude carries out attenuation processing.
Alternatively, the clipping module is specifically additionally operable to：
Using the pad value of signal amplitude corresponding with second time point matching as initial value, to preset attenuation steps pair
Signal amplitude corresponding to time point after second time point progressively carries out attenuation processing, until pad value be reduced to it is default
Value.
Audio defeat method and device provided in an embodiment of the present invention, pending audio signal is obtained, and to this audio
Signal is filtered processing, to generate and the equivalent anti-phase noise reduction control signal of audio signal.When will detect this noise reduction control
In signal sometime point corresponding to signal amplitude meet amplitude limit start threshold value when, then start limiter, to this time point it
Signal amplitude corresponding to time point afterwards is decayed.By one of condition to be reached of uttering long and high-pitched sounds is exactly that signal amplitude reaches
To certain numerical value, and signal amplitude corresponding to the time point after first time point, which is reduced, can then destroy the bar uttered long and high-pitched sounds
Part, so as to avoid the generation uttered long and high-pitched sounds.Two kinds of situations are can be understood as here, avoiding uttering long and high-pitched sounds：When being had occurred and that in earphone
When uttering long and high-pitched sounds, can be suppressed by clipping processes caused by utter long and high-pitched sounds；When earphone is in the unstable state easily uttered long and high-pitched sounds, energy
The generation uttered long and high-pitched sounds can enough be prevented by clipping processes.Finally, then noise reduction control signal by attenuation processing is exported, this is declined
Subtract the noise reduction control signal after processing to be overlapped with noise signal, to realize the noise reduction to pending audio signal.Based on this,
The present invention can reach the effect for carrying out noise reduction to audio signal while avoiding uttering long and high-pitched sounds.
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
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow chart of audio defeat embodiment of the method one provided in an embodiment of the present invention；
Fig. 2 is the flow chart of audio defeat embodiment of the method two provided in an embodiment of the present invention；
Fig. 3 is the signal waveform for the audio signal for not carrying out amplitude attenuation processing；
Fig. 4 is the sound spectrograph for the audio signal for not carrying out amplitude attenuation processing；
Fig. 5 is the signal waveform of audio signal after progress amplitude attenuation processing；
Fig. 6 is the sound spectrograph of audio signal after progress amplitude attenuation processing；
Fig. 7 is the structural representation of audio defeat device embodiment one provided in an embodiment of the present invention；
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The term used in embodiments of the present invention is only merely for the purpose of description specific embodiment, and is not intended to be limiting
The present invention." one kind ", " described " and "the" of singulative used in the embodiment of the present invention and appended claims
It is also intended to including most forms, unless context clearly shows that other implications, " a variety of " generally comprise at least two, but not
Exclusion includes at least one situation.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, represent
There may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while A and B be present, individualism B these three
Situation.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
It will be appreciated that though XXX may be described using term first, second, third, etc. in embodiments of the present invention, but
These XXX should not necessarily be limited by these terms.These terms are only used for XXX being distinguished from each other out.For example, implementation of the present invention is not being departed from
In the case of example scope, the first XXX can also be referred to as the 2nd XXX, and similarly, the 2nd XXX can also be referred to as the first XXX.
Depending on linguistic context, word as used in this " if ", " if " can be construed to " ... when " or
" when ... " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " such as
Fruit detects (condition or event of statement) " can be construed to " when it is determined that when " or " in response to determine " or " when detection (statement
Condition or event) when " or " in response to detect (condition or event of statement) ".
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising, so that commodity or system including a series of elements not only include those key elements, but also including without clear and definite
The other element listed, or also include for this commodity or the intrinsic key element of system.In the feelings not limited more
Under condition, the key element that is limited by sentence "including a ...", it is not excluded that in the commodity including the key element or system also
Other identical element be present.
Fig. 1 is the flow chart of audio defeat embodiment of the method one provided in an embodiment of the present invention, as shown in figure 1, this method
Comprise the following steps：
S101, obtain pending audio signal.
S102, processing is filtered to audio signal, to generate noise reduction control signal.
When using earphone, the sound that user hears is the audio signal that microphone picks up in earphone, wherein this audio
Signal is a mixed signal under normal conditions, it will usually including useful signal and noise signal, wherein, this useful signal can
To be voice either music etc..And after user implements pressing operation to earphone, wherein, pressing operation is typically user
Wearing or removing caused by earphone, now, except useful signal and noise signal in the audio signal that microphone picks up
Outside can also have impact signal, and generally there is larger gap in the amplitude of the signal amplitude of impact signal and useful signal.
Pending audio signal is filtered processing, filtering process is specially：Pending audio signal is obtained, its
In, alternatively, the audio signal of acquisition is a time-domain signal, and based on the generation of this audio signal all the way with this audio signal etc.
It is worth anti-phase noise reduction control signal.
S103, for the noise reduction control signal of first time point be present, after first time point in noise reduction control signal
Time point corresponding to signal amplitude carry out attenuation processing, wherein, signal amplitude corresponding to first time point meet amplitude limit start
Threshold value.
Signal amplitude corresponding to Each point in time in the noise reduction control signal of generation is obtained, wherein, it is optional in practical application
Ground, the flat of signal amplitude can be corresponded in units of a shorter time window, and by multiple time points in this time window
Average is as signal amplitude corresponding to this time window middle time point.It that is to say signal width corresponding to the Each point in time of acquisition
Value is an assembly average.And then then detect whether signal amplitude corresponding to each time point meets that amplitude limit starts threshold value.When
When sometime signal amplitude corresponding to point in noise reduction control signal meets that amplitude limit starts threshold value, then show to believe at this time point
Number amplitude be more than or equal to amplitude limit start threshold value, it is believed that there occurs pressing of the user to earphone at this first time point
Operation or the operation that other are earphone system introducing disturbance, the generation of aforementioned operation can cause the signal width of noise reduction control signal
Degree greatly improves, and when signal amplitude is more than or equal to the amplitude thresholds uttered long and high-pitched sounds, then it is possible to occur in earphone
Utter long and high-pitched sounds.
And in order to avoid the generation uttered long and high-pitched sounds, now, then need to signal width corresponding to the time point after first time point
Value carries out attenuation processing, by reducing the signal amplitude of signal amplitude major part in noise reduction control signal, destroys generation and utters long and high-pitched sounds
Condition, so as to avoid the generation uttered long and high-pitched sounds in earphone.
Alternatively, amplitude limit starts threshold value and pre-set, and can choose the maximum amplitude and impact signal of useful signal
Any value between minimum amplitude, the intermediate value of the two can be chosen under normal circumstances.And maximum amplitude and the punching of useful signal
Hitting the minimum amplitude of signal can be obtained by the way of testing in advance.Specifically, there can be the normal indoor ring of noise
Under border, useful signal is inputted into oscillograph, is wherein to include noise signal in this useful signal, is obtained by oscillograph useful
Maximum amplitude corresponding to signal.Also,, will be by after user's triggering is to the pressing operation of earphone in the environment of in the absence of noise
In the caused impact signal input oscillograph of pressing operation, to obtain minimum amplitude corresponding to this impact signal.
S104, the noise reduction control signal after output attenuatoin processing, to be dropped by noise reduction control signal to audio signal
Make an uproar processing.
The loudspeaker that noise reduction control signal after progress amplitude attenuation processing is inputted to earphone, and sent by loudspeaker
Noise reduction control signal after this attenuation processing, noise reduction control signal are overlapped again with noise signal.Due to having between two signals
There is opposite phase, therefore there can be certain negative function to noise signal after being overlapped, so as to reach the effect of noise reduction.
In the present embodiment, pending audio signal is obtained, and processing is filtered to this audio signal, with generation and sound
The equivalent anti-phase noise reduction control signal of frequency signal.When sometime signal width corresponding to point will be detected in this noise reduction control signal
When value meets that amplitude limit starts threshold value, then start limiter, signal amplitude corresponding to the time point after this time point is carried out
Decay.By one of condition to be reached of uttering long and high-pitched sounds is exactly that signal amplitude reaches certain numerical value, and by first time point it
Signal amplitude corresponding to time point afterwards, which reduces, can then destroy the condition uttered long and high-pitched sounds, so as to avoid the generation uttered long and high-pitched sounds.Here,
Avoid uttering long and high-pitched sounds and can be understood as two kinds of situations：When had occurred and that in earphone utter long and high-pitched sounds when, can be suppressed by clipping processes
It is caused to utter long and high-pitched sounds；When earphone is in the unstable state easily uttered long and high-pitched sounds, be able to can prevent to utter long and high-pitched sounds by clipping processes
Generation.Finally, then noise reduction control signal by attenuation processing is exported, by the noise reduction control signal after this attenuation processing with making an uproar
Acoustical signal is overlapped, to realize the noise reduction to pending audio signal.Based on this, the present invention, which can reach, is avoiding what is uttered long and high-pitched sounds
The effect of noise reduction is carried out to audio signal simultaneously.
Fig. 2 is the flow chart of audio defeat embodiment of the method two provided in an embodiment of the present invention, as shown in Fig. 2 this method
It may include steps of：
S201, obtain pending audio signal.
S202, processing is filtered to audio signal, to generate noise reduction control signal.
Above-mentioned steps S201-S202 implementation procedure is similar to the corresponding steps of previous embodiment, may refer to such as Fig. 1 institutes
Show the associated description in embodiment, will not be repeated here.
S203, for the noise reduction control signal of first time point be present, to first time point in noise reduction control signal and the
Signal amplitude corresponding to each time point between two time points carried out attenuation processing and to the time point after the second time point
Corresponding signal amplitude carries out attenuation processing.
Wherein, signal amplitude corresponding to first time point meets that amplitude limit starts threshold value, and when the second time point and first
Between put between each time point corresponding to signal amplitude meet that amplitude limit starts threshold value, corresponding to the time point after the second time point
Signal amplitude is unsatisfactory for amplitude limit and starts threshold value.
Based on signal amplitude corresponding to Each point in time in noise reduction control signal is obtained, by signal width in noise reduction control signal
Value meets that amplitude limit starts first time point of threshold value as first time point, and signal amplitude is met into amplitude limit starts threshold value most
The latter time point carries out amplitude to each time point between first time point and the second time point and declined as the second time point
Subtract processing.
, can be with the first pad value to each between first time point and the second time point as a kind of mode alternatively
Signal amplitude corresponding to time point carries out attenuation processing, that is to say each signal pair between first time point and the second time point
The signal amplitude answered all reduces the first pad value.
Alternatively, the first pad value can be by testing acquisition in advance：When user does not carry out pressing operation to earphone, meter
Calculate average signal magnitude of the noise reduction control signal in whole frequency range；When user carries out pressing operation to earphone, noise reduction is calculated
Average signal magnitude of the control signal in whole frequency range, and using the difference of two average signal magnitudes as the first pad value.Can
Selection of land, pressing operation can also be carried out and during without pressing operation in user respectively, noise reduction control signal is calculated and easily sending out
Average signal magnitude in the raw special frequency channel uttered long and high-pitched sounds, and using the difference of the average signal magnitude of signal in special frequency channel as first
Pad value.
, can also be according to each time point between first time point and the second time point as another mode alternatively
Corresponding signal amplitude starts the degree of threshold value beyond amplitude limit, it is determined that the second of signal amplitude corresponding with each time point matching declines
Depreciation, then attenuation processing is carried out to signal amplitude corresponding to each time point with the second pad value of each Self Matching, wherein, second declines
Depreciation is less than or equal to the first pad value.
Specifically, obtain first time point and each time point corresponding signal amplitude starts with amplitude limit between the second time point
Difference in magnitude between threshold value.Exceed degree according to what the size of difference in magnitude judged difference in magnitude, declined further according to beyond degree and second
Corresponding relation between depreciation determines the second pad value of signal amplitude matching corresponding with each time point.For beyond degree with
Corresponding relation between second pad value, for example, Ke Yiwei：Exceed level corresponding to first when difference in magnitude is 1~5dB
, do not show signal amplitude corresponding to this time point start beyond amplitude limit threshold value degree it is relatively low, and first exceed rank with this
Second pad value of matching is 10dB, and the first signal amplitude beyond time point corresponding to rank then now is reduced into 10dB.When
Exceed rank corresponding to second when difference in magnitude is 6~10dB, be 10dB with this second second pad value matched beyond rank, this
Second signal amplitude beyond time point corresponding to rank is reduced 20dB by Shi Ze.Correspond to the 3rd when difference in magnitude is more than 10dB
Beyond rank, the degree that amplitude corresponding to this time point starts threshold value beyond amplitude limit is higher, the 3rd is matched with this beyond rank
Second pad value is 30dB, and the 3rd signal amplitude beyond time point corresponding to rank then now is reduced into 30dB.
What deserves to be explained is when the first time point for meeting amplitude limit startup threshold value to signal amplitude and between the second time point
Each time point corresponding to signal amplitude carry out attenuation processing after, can make each signal correspond to signal amplitude produce one acutely
Decay, and this violent decay is that we want to obtain.But if between first time point and the second time point
After signal amplitude corresponding to each time point carries out attenuation processing, stop the attenuation processing to subsequent point in time amplitude immediately, having can
Can system can be made to reenter unstable state, so as to again produce utter long and high-pitched sounds, therefore, it is also desirable to simultaneously to the second time point after
Time point corresponding to signal amplitude decayed, this attenuation process is a process progressively to decay.
It is alternatively possible to using the pad value of signal amplitude corresponding with the second time point matching as initial value, declined with default
Subtract step-length and progressively attenuation processing is carried out to signal amplitude corresponding to the time point after the second time point, until pad value is reduced to
Preset value, then stop amplitude attenuation processing, alternatively, this preset value can be 0.For example, with the second time Point matching
Pad value is A, and it is B to preset attenuation steps, then the pad value with the time Point matching after the second time point is followed successively by A-B, A-
2B, A-3B ..., until pad value is reduced to preset value.
Optionally, can also the pad value of corresponding with the second time point signal amplitude matching be initial value, while by the
Time point after two time points is entered with being divided into a group per N number of time point to every a small group according to default attenuation steps
Row amplitude attenuation, until pad value is reduced to preset value, then stop amplitude attenuation processing.For example, with the second time point
The pad value matched somebody with somebody is C, and default attenuation steps are D, then are divided into every N number of time point after the second time point one small
Group, to obtain M group.And pad value corresponding to N each time points is all C-D in the first group, N each time points in the second group
Corresponding pad value is all C-2D, in the 3rd group pad value corresponding to N each time points all for C-3D ... until certain a small group
Corresponding pad value is reduced to preset value.
S204, the noise reduction control signal after output attenuatoin processing, to be dropped by noise reduction control signal to audio signal
Make an uproar processing.
Above-mentioned steps S204 implementation procedure is similar to the corresponding steps of previous embodiment, may refer to reality as shown in Figure 1
The associated description in example is applied, will not be repeated here.
In the present embodiment, the journey for obtaining pad value or starting threshold value beyond amplitude limit according to signal amplitude can be precalculated
Degree selects pad value corresponding with degree, determines corresponding pad value according to different service conditions, and signal amplitude is met
Amplitude limit starts the first time point of threshold value and each time point between the second time point corresponding signal amplitude carries out attenuation processing,
So that the signal amplitude at each time point is reduced in noise reduction control signal, the condition uttered long and high-pitched sounds is produced so as to destroy, also it is avoided that
The generation uttered long and high-pitched sounds.And to continue attenuation processing to signal amplitude corresponding to the time point after the second time point, keep away
It is that system brings destabilizing factor to exempt to occur because stopping amplitude attenuation processing immediately.Therefore, for after to the second time point
Signal amplitude corresponding to time point continue attenuation processing can ensure system it is stable while avoid the generation uttered long and high-pitched sounds.
Noise reduction control signal output after finally amplitude attenuation is handled, to be carried out by noise reduction control signal to audio signal at noise reduction
Reason.
In addition, the present invention program is applied in practice：The pressing operation to earphone is triggered under general room environment, this
When obtain waveform corresponding to audio signal, as shown in figure 3, wherein, Fig. 3 abscissa is the time, and ordinate is signal amplitude, this
Audio signal corresponding audio signal when being without amplitude limiting processing.From the figure 3, it may be seen that pressing operation can cause it is some in audio signal
Signal amplitude increases suddenly corresponding to time point, such as the position in Fig. 3 shown in white edge, and excessive signal amplitude is very possible
Uttered long and high-pitched sounds in earphone.Fig. 4 is the sound spectrograph of audio signal, wherein, Fig. 4 abscissa is the time, and ordinate is frequency, language
The depth of color represents energy size corresponding to each frequency range in signal in spectrogram, and color more superficial shows that energy is bigger.Can by Fig. 4
Know, in 1~3KHz, this frequency range has maximum energy, and can know that this frequency range is also to be easiest to make a whistling sound by experiment
The frequency range cried.
After carrying out amplitude limiting processing to audio signal using the solution of the present invention, the waveform of audio signal after amplitude limit is obtained, such as
Shown in Fig. 5, and Fig. 6 is the sound spectrograph of audio signal after amplitude limit.Fig. 5 is compared with Fig. 3, it can be seen that signal amplitude subtracts significantly
Small, compared with Fig. 4, the signal energy of this frequency range of 1~3KHz also significantly reduces Fig. 6.The reduction of signal amplitude also just destroys
The condition uttered long and high-pitched sounds is produced, therefore also avoids the generation uttered long and high-pitched sounds in earphone.
It should be noted that it is the obtained easy frequency range uttered long and high-pitched sounds under routine experimentation environment in Fig. 4 and Fig. 6.And
In practical application, when experimental situation changes, the frequency range easily uttered long and high-pitched sounds is possible to also occur to change accordingly.Cause
This, 1~3KHz being related in above-mentioned Fig. 4 and Fig. 6 is a schematical band limits, and the solution of the present invention can be applicable
In full frequency band, some band limits is not limited specifically.Fig. 4 and Fig. 6 is also to play a signal to act on, and schematically indicates that this
Scheme of the invention can be such that the signal amplitude of easy frequency range of uttering long and high-pitched sounds reduces so as to reach the effect for avoiding uttering long and high-pitched sounds.
Fig. 7 is the structural representation of audio defeat device embodiment one provided in an embodiment of the present invention, as shown in fig. 7, should
Audio defeat device includes：Acquisition module 11, filtration module 12, clipping module 13, output module 14.
Acquisition module 11, for obtaining pending audio signal.
Filtration module 12, for being filtered processing to audio signal, to generate noise reduction control signal.
Clipping module 13, for for the noise reduction control signal of first time point be present, in noise reduction control signal first
Signal amplitude corresponding to time point after time point carries out attenuation processing, wherein, signal amplitude is expired corresponding to first time point
Sufficient amplitude limit starts threshold value.
Output module 14, for output attenuatoin handle after noise reduction control signal, with by noise reduction control signal to audio
Signal carries out noise reduction process.
Alternatively, the clipping module 13 in the audio defeat device is specifically used for：
Attenuation processing is carried out to each time point between first time point and the second time point corresponding signal amplitude.
Attenuation processing is carried out to signal amplitude corresponding to the time point after the second time point, when the second time point is with first
Between put between each time point corresponding to signal amplitude meet that amplitude limit starts threshold value, corresponding to the time point after the second time point
Signal amplitude is unsatisfactory for amplitude limit and starts threshold value.
Alternatively, the clipping module 13 in the audio defeat device is specifically used for：
Each time point between first time point and the second time point corresponding signal amplitude is carried out with the first pad value
Attenuation processing.
Alternatively, the clipping module 13 in the audio defeat device is specifically additionally operable to：
Amplitude limit actuation threshold is exceeded according to each time point between first time point and the second time point corresponding signal amplitude
The degree of value, it is determined that the second pad value of signal amplitude corresponding with each time point matching
Signal amplitude corresponding to each time point is entered with the second pad value that signal amplitude corresponding with each time point matches
Row attenuation processing.
Alternatively, the clipping module 13 in the audio defeat device is specifically additionally operable to：
Using the pad value of signal amplitude corresponding with the second time point matching as initial value, with default attenuation steps to second
Signal amplitude progressively carries out attenuation processing corresponding to time point after time point, until pad value is reduced to preset value.
Fig. 7 shown devices can perform the method for Fig. 1 and embodiment illustrated in fig. 2, the part that the present embodiment is not described in detail,
Refer to the related description to Fig. 1 and embodiment illustrated in fig. 2.The implementation procedure of the technical scheme and technique effect referring to Fig. 1 and
Description in embodiment illustrated in fig. 2, will not be repeated here.
Device embodiment described above is only schematical, wherein the unit illustrated as separating component can
To be or may not be physically separate, it can be as the part that unit is shown or may not be physics list
Member, you can with positioned at a place, or can also be distributed on multiple NEs.It can be selected according to the actual needs
In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Work in the case of, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
Realized by the mode of general hardware platform necessary to add, naturally it is also possible to pass through hardware.Based on such understanding, above-mentioned skill
The part that art scheme substantially contributes to prior art in other words can be embodied in the form of product, computer production
Product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are causing one
Platform computer installation (can be personal computer, server, either network equipment etc.) perform each embodiment or embodiment
Some parts described in method.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
- A kind of 1. audio defeat method, it is characterised in that including：Obtain pending audio signal；Processing is filtered to the audio signal, to generate noise reduction control signal；For the noise reduction control signal of first time point be present, after first time point in the noise reduction control signal Signal amplitude corresponding to time point carries out attenuation processing, wherein, signal amplitude corresponding to the first time point meets that amplitude limit opens Dynamic threshold value；Noise reduction control signal after output attenuatoin processing, to carry out noise reduction to the audio signal by the noise reduction control signal Processing.
- 2. according to the method for claim 1, it is characterised in that described corresponding to the time point after the first time point Signal amplitude carry out attenuation processing, including：Attenuation processing is carried out and to institute to each time point between first time point and the second time point corresponding signal amplitude State signal amplitude corresponding to the time point after the second time point and carry out attenuation processing, when second time point is with described first Between put between each time point corresponding to signal amplitude meet that the amplitude limit starts threshold value, the time after second time point Signal amplitude corresponding to point is unsatisfactory for the amplitude limit and starts threshold value.
- 3. according to the method for claim 2, it is characterised in that described to each between first time point and the second time point Signal amplitude corresponding to time point carries out attenuation processing, including：Each time point between the first time point and the second time point corresponding signal amplitude is carried out with the first pad value Attenuation processing.
- 4. according to the method for claim 2, it is characterised in that described to each between first time point and the second time point Signal amplitude corresponding to time point carries out attenuation processing, including：Opened according to each time point between the first time point and the second time point corresponding signal amplitude beyond the amplitude limit The degree of dynamic threshold value, it is determined that the second pad value of signal amplitude matching corresponding with each time point；With the second pad value of signal amplitude matching corresponding with each time point to signal width corresponding to each time point Value carries out attenuation processing.
- 5. the method according to any one of claim 2 to 4, it is characterised in that it is described to second time point after Time point corresponding to signal amplitude carry out attenuation processing, including：Using the pad value of signal amplitude corresponding with second time point matching as initial value, with default attenuation steps to described Signal amplitude progressively carries out attenuation processing corresponding to time point after second time point, until pad value is reduced to preset value.
- A kind of 6. audio defeat device, it is characterised in that including：Acquisition module, for obtaining pending audio signal；Filtration module, for being filtered processing to the audio signal, to generate noise reduction control signal；Clipping module, for for the noise reduction control signal of first time point be present, in the noise reduction control signal Signal amplitude corresponding to time point after one time point carries out attenuation processing, wherein, signal corresponding to the first time point Amplitude meets that amplitude limit starts threshold value；Output module, for output attenuatoin handle after noise reduction control signal, with by the noise reduction control signal to the sound Frequency signal carries out noise reduction process.
- 7. device according to claim 6, it is characterised in that the clipping module is specifically used for：Attenuation processing is carried out to each time point between first time point and the second time point corresponding signal amplitude；Attenuation processing, second time point and institute are carried out to signal amplitude corresponding to the time point after second time point Signal amplitude corresponding to stating each time point between first time point meets that the amplitude limit starts threshold value, second time point it Signal amplitude corresponding to time point afterwards is unsatisfactory for the amplitude limit and starts threshold value.
- 8. device according to claim 7, it is characterised in that the clipping module is specifically used for：With the first pad value pair Each time point between the first time point and the second time point corresponding signal amplitude carries out attenuation processing.
- 9. device according to claim 7, it is characterised in that the clipping module is specifically additionally operable to：According to described first Each time point between time point and the second time point corresponding signal amplitude starts the degree of threshold value beyond the amplitude limit, it is determined that Second pad value of signal amplitude matching corresponding with each time point；With the second pad value of signal amplitude matching corresponding with each time point to signal width corresponding to each time point Value carries out attenuation processing.
- 10. according to any described device in claim 7-9, it is characterised in that the clipping module is specifically additionally operable to：With with The pad value that signal amplitude corresponding to second time point matches is initial value, with default attenuation steps to second time Signal amplitude corresponding to time point after point progressively carries out attenuation processing, until pad value is reduced to preset value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710661979.0A CN107393551B (en) | 2017-08-04 | 2017-08-04 | Audio noise reduction method and device |
| PCT/CN2017/108092 WO2019024278A1 (en) | 2017-08-04 | 2017-10-27 | Audio noise reduction method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710661979.0A CN107393551B (en) | 2017-08-04 | 2017-08-04 | Audio noise reduction method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107393551A true CN107393551A (en) | 2017-11-24 |
| CN107393551B CN107393551B (en) | 2021-07-30 |
Family
ID=60343929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710661979.0A Active CN107393551B (en) | 2017-08-04 | 2017-08-04 | Audio noise reduction method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107393551B (en) |
| WO (1) | WO2019024278A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109040889A (en) * | 2018-07-27 | 2018-12-18 | 歌尔科技有限公司 | A kind of feedback noise reduction earphone and its feed circuit |
| CN109817241A (en) * | 2019-02-18 | 2019-05-28 | 腾讯音乐娱乐科技（深圳）有限公司 | Audio-frequency processing method, device and storage medium |
| CN111667847A (en) * | 2019-03-05 | 2020-09-15 | 成都鼎桥通信技术有限公司 | Howling suppression method, howling suppression device, howling suppression equipment and storage medium |
| CN113299304A (en) * | 2021-05-11 | 2021-08-24 | 泰凌微电子(上海)股份有限公司 | Method and device for inhibiting microphone howling and microphone |
| CN113660594A (en) * | 2021-08-21 | 2021-11-16 | 武汉左点科技有限公司 | Self-adjusting noise reduction method and device for hearing aid system |
| CN115223584A (en) * | 2022-09-19 | 2022-10-21 | 腾讯科技（深圳）有限公司 | Audio data processing method, device, equipment and storage medium |
| CN115527518A (en) * | 2022-09-19 | 2022-12-27 | 深圳市野草声学有限公司 | Audio multi-track synthesis method, video shooting equipment and system based on communication network |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07254870A (en) * | 1994-03-16 | 1995-10-03 | Mitsubishi Electric Corp | Howling prevention method and device in communication system |
| CN102316395A (en) * | 2010-07-09 | 2012-01-11 | 廖明忠 | Method and device for judging and eliminating howlround |
| US8315405B2 (en) * | 2009-04-28 | 2012-11-20 | Bose Corporation | Coordinated ANR reference sound compression |
| CN103338419A (en) * | 2013-06-29 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Method and device for removing headset scream |
| CN203933932U (en) * | 2014-06-30 | 2014-11-05 | 青岛歌尔声学科技有限公司 | A kind of uttering long and high-pitched sounds eliminated circuit and earphone |
| CN106162410A (en) * | 2016-08-16 | 2016-11-23 | 歌尔股份有限公司 | A kind of noise cancelling headphone |
| CN205864675U (en) * | 2016-06-27 | 2017-01-04 | 万魔声学科技有限公司 | Noise cancelling headphone |
| CN106782487A (en) * | 2016-12-20 | 2017-05-31 | 歌尔科技有限公司 | The noise reduction emulation mode and system of reaction type active noise reduction earphone |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5377275A (en) * | 1992-07-29 | 1994-12-27 | Kabushiki Kaisha Toshiba | Active noise control apparatus |
| CN201260224Y (en) * | 2008-08-04 | 2009-06-17 | 宇龙计算机通信科技(深圳)有限公司 | Noise reducing device and noise reducing mobile terminal |
| CN203872324U (en) * | 2014-03-31 | 2014-10-08 | 深圳市冠旭电子有限公司 | Active noise reduction earphone and noise reduction microphone signal passive amplitude limiting circuit thereof |
| CN105812993B (en) * | 2014-12-29 | 2019-02-15 | 联芯科技有限公司 | It utters long and high-pitched sounds detection and suppressing method and its device |
| CN106550300B (en) * | 2015-09-18 | 2020-02-11 | 成都鼎桥通信技术有限公司 | Howling suppression method |
| CN105872910A (en) * | 2016-03-23 | 2016-08-17 | 成都普创通信技术股份有限公司 | Audio signal squeaking detection method |
| CN105931647B (en) * | 2016-04-05 | 2020-01-14 | Oppo广东移动通信有限公司 | Method and device for noise suppression |
-
2017
- 2017-08-04 CN CN201710661979.0A patent/CN107393551B/en active Active
- 2017-10-27 WO PCT/CN2017/108092 patent/WO2019024278A1/en not_active Ceased
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07254870A (en) * | 1994-03-16 | 1995-10-03 | Mitsubishi Electric Corp | Howling prevention method and device in communication system |
| US8315405B2 (en) * | 2009-04-28 | 2012-11-20 | Bose Corporation | Coordinated ANR reference sound compression |
| CN102316395A (en) * | 2010-07-09 | 2012-01-11 | 廖明忠 | Method and device for judging and eliminating howlround |
| CN103338419A (en) * | 2013-06-29 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Method and device for removing headset scream |
| CN203933932U (en) * | 2014-06-30 | 2014-11-05 | 青岛歌尔声学科技有限公司 | A kind of uttering long and high-pitched sounds eliminated circuit and earphone |
| CN205864675U (en) * | 2016-06-27 | 2017-01-04 | 万魔声学科技有限公司 | Noise cancelling headphone |
| CN106162410A (en) * | 2016-08-16 | 2016-11-23 | 歌尔股份有限公司 | A kind of noise cancelling headphone |
| CN106782487A (en) * | 2016-12-20 | 2017-05-31 | 歌尔科技有限公司 | The noise reduction emulation mode and system of reaction type active noise reduction earphone |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109040889A (en) * | 2018-07-27 | 2018-12-18 | 歌尔科技有限公司 | A kind of feedback noise reduction earphone and its feed circuit |
| CN109817241A (en) * | 2019-02-18 | 2019-05-28 | 腾讯音乐娱乐科技（深圳）有限公司 | Audio-frequency processing method, device and storage medium |
| CN111667847A (en) * | 2019-03-05 | 2020-09-15 | 成都鼎桥通信技术有限公司 | Howling suppression method, howling suppression device, howling suppression equipment and storage medium |
| CN113299304A (en) * | 2021-05-11 | 2021-08-24 | 泰凌微电子(上海)股份有限公司 | Method and device for inhibiting microphone howling and microphone |
| CN113299304B (en) * | 2021-05-11 | 2023-09-12 | 泰凌微电子(上海)股份有限公司 | Method, device and microphone for suppressing microphone howling |
| CN113660594A (en) * | 2021-08-21 | 2021-11-16 | 武汉左点科技有限公司 | Self-adjusting noise reduction method and device for hearing aid system |
| CN113660594B (en) * | 2021-08-21 | 2024-05-17 | 武汉左点科技有限公司 | Self-adjusting noise reduction method and device for hearing aid system |
| CN115223584A (en) * | 2022-09-19 | 2022-10-21 | 腾讯科技（深圳）有限公司 | Audio data processing method, device, equipment and storage medium |
| CN115527518A (en) * | 2022-09-19 | 2022-12-27 | 深圳市野草声学有限公司 | Audio multi-track synthesis method, video shooting equipment and system based on communication network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107393551B (en) | 2021-07-30 |
| WO2019024278A1 (en) | 2019-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107393551A (en) | Audio defeat method and device | |
| US8611554B2 (en) | Hearing assistance apparatus | |
| US4928307A (en) | Time dependent, variable amplitude threshold output circuit for frequency variant and frequency invariant signal discrimination | |
| EP3038106B1 (en) | Audio signal enhancement | |
| CN103329201B (en) | For hiding the method and apparatus of wind noise | |
| CN108847208A (en) | A kind of noise reduction process method, apparatus and earphone | |
| US20130156208A1 (en) | Hearing aid and method of detecting vibration | |
| EP2984650B1 (en) | Audio data dereverberation | |
| Yoo et al. | Speech signal modification to increase intelligibility in noisy environments | |
| EP3847826B1 (en) | Dynamic environmental overlay instability detection and suppression in media-compensated pass-through devices | |
| US5070527A (en) | Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination | |
| CN107452394A (en) | A kind of method and system that noise is reduced based on frequency characteristic | |
| US9877118B2 (en) | Method for frequency-dependent noise suppression of an input signal | |
| KR101961998B1 (en) | Reducing instantaneous wind noise | |
| Lezzoum et al. | Voice activity detection system for smart earphones | |
| EP3696815B1 (en) | Nonlinear noise reduction system | |
| CN102144257A (en) | Method for transient peak level management and speech intelligibility improvement | |
| EP4158625B1 (en) | A own voice detector of a hearing device | |
| JPH02232697A (en) | Voice recognition device | |
| Qu | Exploration of a New Active Noise Cancellation Headset Based on Spectral Contrast Enhancement Technique | |
| Kwan et al. | Enhanced speech in noisy multiple speaker environment | |
| KR20160106951A (en) | Method for listening intelligibility using syllable-type-based phoneme weighting techniques in noisy environments, and recording medium thereof | |
| Rasetshwane et al. | Enhancement of speech intelligibility using transients extracted by wavelet packets | |
| US10720171B1 (en) | Audio processing | |
| JP6435133B2 (en) | Phoneme segmentation apparatus, speech processing system, phoneme segmentation method, and phoneme segmentation program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |