CN110022514A - Noise-reduction method, device, system and the computer storage medium of audio signal - Google Patents
Noise-reduction method, device, system and the computer storage medium of audio signal Download PDFInfo
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- CN110022514A CN110022514A CN201910418065.0A CN201910418065A CN110022514A CN 110022514 A CN110022514 A CN 110022514A CN 201910418065 A CN201910418065 A CN 201910418065A CN 110022514 A CN110022514 A CN 110022514A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The invention discloses a kind of noise-reduction method of audio signal, the noise-reduction method of the audio signal obtains envelope detection signal corresponding with the audio input signal by peak envelop detection the following steps are included: when getting audio input signal；Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；Output amplitude adjustment treated the audio input signal.The invention also discloses a kind of denoising device of audio signal, system and computer storage mediums, the corresponding detection value of amplitude that noise element can be effectively filtered out by peak envelop detection, and according to the amplitude of the corresponding adjustment audio input signal of the variation of the detection value of envelope detection signal, to achieve the purpose that noise reduction, and noise reduction effect is more preferable.
Description
Technical field
The present invention relates to the noise-reduction method of audio signal processing technique field more particularly to audio signal, device, system and calculating
Machine storage medium.
Background technique
It usually include noise in the sound of the audio pick-up devices such as microphone acquisition, these are made an uproar in the fields such as sound pick-up
The ingredient of sound is typically complex, and in different environments, and the type of noise also has larger difference.
Currently, the method for noise reduction process can be divided into three classes: reducing noise source, partition noise transmission path and to equipment itself
Noise reduction process.However, it is relatively difficult to achieve to reduce noise source, partition noise transmission path, and to the noise reduction process of equipment itself
When identifying noise signal, recognition accuracy is lower, and therefore, the noise reduction effect of existing noise reduction process method is all poor.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide the storages of a kind of noise-reduction method of audio signal, device, system and computer
Medium, it is intended to the corresponding detection value of amplitude that noise element can be effectively filtered out by peak envelop detection, and examined according to envelope
The amplitude of the corresponding adjustment audio input signal of the variation of the detection value of wave signal, to achieve the purpose that noise reduction, and noise reduction is imitated
Fruit is more preferable.
To achieve the above object, the present invention provides a kind of noise-reduction method of audio signal, the noise reduction side of the audio signal
Method the following steps are included:
When getting audio input signal, packet corresponding with the audio input signal is obtained by peak envelop detection
Network rectified signal；
Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；
Output amplitude adjustment treated the audio input signal.
Optionally, described when getting audio input signal, it is obtained and the audio input by peak envelop detection
The step of signal corresponding envelope detection signal includes:
Scaling down processing is carried out to the audio input signal, obtains multiple frequency band signals；
Peak envelop detection processing is carried out to multiple frequency band signals respectively, obtains multiple envelope detection signals.
Optionally, described the step of carrying out scaling down processing to the audio input signal, includes:
Obtain the frequency of the audio input signal；
Obtain the corresponding frequency separation of the frequency；
The audio input signal is divided into multiple frequency band signals according to the frequency separation.
Optionally, the detection value according to the envelope detection signal carries out amplitude adjustment to the audio input signal
Before the step of processing, further includes:
Detection amplification factor and detection threshold limit are determined according to the detection value of the envelope detection signal；
Processing is amplified according to detection value of the detection amplification factor to the envelope detection signal；
It is carried out at limitation according to detection value of the detection threshold limit to the envelope detection signal after enhanced processing
Reason, and update according to the detection value of limitation treated the envelope detection signal detection value of the envelope detection signal.
Optionally, the detection value according to the envelope detection signal carries out amplitude adjustment to the audio input signal
The step of processing includes:
Judge whether the detection value of the envelope detection signal is greater than preset value；
When the detection value of the envelope detection signal is greater than the preset value, increase the frequency in the audio input signal
The amplitude of segment signal, wherein the detection value of the envelope detection signal and the difference of the preset value are bigger, the frequency band signals
Amplitude increase it is bigger；
When the detection value of the envelope detection signal is less than the preset value, reduce the amplitude of the frequency band signals,
In, the preset value and the difference of the detection value of the envelope detection signal are bigger, the reduction amount of the amplitude of the frequency band signals
It is bigger.
Optionally, the detection value according to the envelope detection signal carries out amplitude adjustment to the audio input signal
The step of processing includes:
Judge whether the detection value of the envelope detection signal within a preset time changes；
It, will be in the audio input signal when detection value of the envelope detection signal does not change within a preset time
The amplitudes of frequency band signals be adjusted to predetermined amplitude.
Optionally, the step of output amplitude adjustment treated audio input signal includes:
Frequency mixing processing is carried out to multiple frequency band signals in amplitude adjustment treated the audio input signal, obtains sound
Frequency output signal；
Export the audio output signal.
In addition, to achieve the above object, the present invention also provides a kind of denoising device of audio signal, the audio signal
Denoising device includes: the audio letter that memory, processor and being stored in can be run on the memory and on the processor
Number noise reduction program, when the noise reduction program of the audio signal is executed by the processor realize as described above any one of described in
Audio signal noise-reduction method the step of.
In addition, to achieve the above object, it is described computer-readable the present invention also provides a kind of computer readable storage medium
It is stored with the noise reduction program of audio signal on storage medium, is realized such as when the noise reduction program of the audio signal is executed by processor
The step of noise-reduction method of audio signal described in any one of described in upper.
In addition, to achieve the above object, the present invention also provides a kind of noise reduction system of audio signal, the audio signal
Noise reduction system includes the noise reduction program of audio signal, for execute as described above any one of described in audio signal noise reduction side
The step of method.
Noise-reduction method, device, system and the computer storage medium for the audio signal that the embodiment of the present invention proposes, are obtaining
When to audio input signal, passes through peak envelop detection and obtain envelope detection signal corresponding with the audio input signal；Root
Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；Output amplitude adjustment processing
The audio input signal afterwards.The embodiment of the present invention is corresponding by the amplitude that peak envelop detection can effectively filter out noise element
Detection value, reduce envelope detection to the susceptibility of noise, and corresponding according to the variation of the detection value of envelope detection signal
The amplitude for adjusting audio input signal is equivalent to the amplitude according to the corresponding detection value adjustment audio input signal of effective sound,
To achieve the purpose that noise reduction, and noise reduction effect is more preferable.
Detailed description of the invention
Fig. 1 is the terminal structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to；
Fig. 2 is the flow diagram of an embodiment of the noise-reduction method of audio signal of the present invention；
Fig. 3 is the refinement flow diagram of Fig. 2 step S10；
Fig. 4 is the flow diagram of the noise-reduction method another embodiment of audio signal of the present invention；
Fig. 5 is the refinement flow diagram of Fig. 2 step S20.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The primary solutions of the embodiment of the present invention are:
When getting audio input signal, packet corresponding with the audio input signal is obtained by peak envelop detection
Network rectified signal；
Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；
Output amplitude adjustment treated the audio input signal.
Since in the prior art, the method for noise reduction process can be divided into three classes: reduce noise source, partition noise transmission path and
To the noise reduction process of equipment itself.However, it is relatively difficult to achieve to reduce noise source, partition noise transmission path, and to equipment itself
Noise reduction process when identifying noise signal, recognition accuracy is lower, and therefore, the noise reduction effect of existing noise reduction process method is all
It is poor.
The present invention provides a solution, and the amplitude that can effectively filter out noise element by peak envelop detection is corresponding
Detection value, and according to the amplitude of the corresponding adjustment audio input signal of the variation of the detection value of envelope detection signal, to reach
The purpose of noise reduction, and noise reduction effect is more preferable.
As shown in Figure 1, Fig. 1 is the terminal structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to.
The terminal of that embodiment of the invention can be stereo set, be also possible to PC, smart phone, tablet computer, MP3
(Moving Picture Experts Group Audio Layer III, dynamic image expert's compression standard audio level 3)
Player, MP4 (Moving Picture Experts Group Audio Layer IV, dynamic image expert's compression standard sound
Frequency level 3) terminal device with microphone and loudspeaker such as player, portable computer.
As shown in Figure 1, the terminal may include: processor 1001, such as CPU, network interface 1004, user interface
1003, memory 1005, communication bus 1002.Wherein, communication bus 1002 is for realizing the connection communication between these components.
User interface 1003 may include display screen (Display), input unit such as keyboard (Keyboard), optional user interface
1003 can also include standard wireline interface and wireless interface.Network interface 1004 optionally may include that the wired of standard connects
Mouth, wireless interface (such as WI-FI interface).Memory 1005 can be high speed RAM memory, be also possible to stable memory
(non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned processor
At least one of 1001 storage device, including embedded storage device, non-embedded storage device.
It will be understood by those skilled in the art that the restriction of the not structure paired terminal of terminal structure shown in Fig. 1, can wrap
It includes than illustrating more or fewer components, perhaps combines certain components or different component layouts.
As shown in Figure 1, as may include that operating system, network are logical in a kind of memory 1005 of computer storage medium
Believe the noise reduction program of module, Subscriber Interface Module SIM and audio signal.
In terminal shown in Fig. 1, network interface 1004 is mainly used for connecting background server, carries out with background server
Data communication；User interface 1003 is mainly used for connecting client (user terminal), carries out data communication with client；And processor
1001 can be used for calling the noise reduction program of the audio signal stored in memory 1005, and execute following operation:
When getting audio input signal, packet corresponding with the audio input signal is obtained by peak envelop detection
Network rectified signal；
Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；
Output amplitude adjustment treated the audio input signal.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Scaling down processing is carried out to the audio input signal, obtains multiple frequency band signals；
Peak envelop detection processing is carried out to multiple frequency band signals respectively, obtains multiple envelope detection signals.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Obtain the frequency of the audio input signal；
Obtain the corresponding frequency separation of the frequency；
The audio input signal is divided into multiple frequency band signals according to the frequency separation.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Detection amplification factor and detection threshold limit are determined according to the detection value of the envelope detection signal；
Processing is amplified according to detection value of the detection amplification factor to the envelope detection signal；
It is carried out at limitation according to detection value of the detection threshold limit to the envelope detection signal after enhanced processing
Reason, and update according to the detection value of limitation treated the envelope detection signal detection value of the envelope detection signal.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Judge whether the detection value of the envelope detection signal is greater than preset value；
When the detection value of the envelope detection signal is greater than the preset value, increase the frequency in the audio input signal
The amplitude of segment signal, wherein the detection value of the envelope detection signal and the difference of the preset value are bigger, the frequency band signals
Amplitude increase it is bigger；
When the detection value of the envelope detection signal is less than the preset value, reduce the amplitude of the frequency band signals,
In, the preset value and the difference of the detection value of the envelope detection signal are bigger, the reduction amount of the amplitude of the frequency band signals
It is bigger.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Judge whether the detection value of the envelope detection signal within a preset time changes；
It, will be in the audio input signal when detection value of the envelope detection signal does not change within a preset time
The amplitudes of frequency band signals be adjusted to predetermined amplitude.
Further, processor 1001 can call the noise reduction program of the audio signal stored in memory 1005, also hold
The following operation of row:
Frequency mixing processing is carried out to multiple frequency band signals in amplitude adjustment treated the audio input signal, obtains sound
Frequency output signal；
Export the audio output signal.
Referring to Fig. 2, in one embodiment, the noise-reduction method of the audio signal the following steps are included:
Step S10 is obtained and the audio input signal when getting audio input signal by peak envelop detection
Corresponding envelope detection signal；
In the present embodiment, stereo set generally passes through the devices such as microphone or microphone, and the various sound in environment are turned
Turn to electric signal, i.e. audio input signal.In order to reduce the noise in audio input signal, audio input signal can be carried out more
Kind noise reduction process, amplitude etc. including adjusting audio input signal are handled.But above-mentioned noise reduction is being carried out to audio input signal
After processing, certain change can occur for the sound of output, so as to cause the distortion of sound.Therefore, in order to reduce to the greatest extent at noise reduction
The influence for exporting sound is managed, audio input signal can be divided into multiple frequency band signals, and then each frequency range is believed respectively
Number carry out noise reduction process.Since the frequency of effective sound and the frequency of noise are usually different, individually to each frequency range
Signal carries out amplitude adjustment, can further decrease noise.
Before the amplitude for adjusting audio input signal, peak envelop detection can be carried out to audio input signal, to obtain
Envelope detection signal, and then according to the amplitude of the detection value of envelope detection signal adjusting audio input signal.If audio input is believed
Number multiple frequency band signals are divided into, then peak envelop detection can be individually carried out to each frequency band signals, to obtain each frequency
The corresponding envelope detection signal of segment signal, and then amplitude adjustment is carried out to each frequency band signals respectively.In audio input signal,
The amplitude of audio input signal be it is continually changing at any time, point, the amplitude of audio input signal are usually in different times
Different, and the amplitude of noise is then relatively stable, therefore by peak envelop detection, can filter out the corresponding packet of noise element
Network rectified signal farthest retains the corresponding envelope detection signal of effective sound, and envelope detection signal can representation signal
Amplitude variation be equivalent to be changed according to the amplitude of effective sound and adjust in this way when adjusting the amplitude of audio input signal
The amplitude of audio input signal realizes the purpose for reducing noise to reduce the susceptibility to noise element.Envelope detection
(envelope-demodulation) be based on filtering detection vibration signal processing method, mainly include peak envelop detection,
Mean value envelope detection, quasi-peak value envelope detection etc..Peak envelop detection passes through wave detector for the frequency band signals of a period of time length
Peak point line, so that it may obtain top (positive) line and lower section (negative) line, i.e. two envelopes up and down.Packet
Winding thread can be used to indicate the curve of frequency band signals amplitude variation.After peak envelop detection, the corresponding inspection of most noises
Wave number is covered by the corresponding detection value of effective sound, to realize the effect of noise reduction.When carrying out peak envelop detection, the time is normal
Several settings is extremely important, when time constant setting is bigger than normal, will lead to the distortion of sound, when time constant setting is less than normal,
Noise reduction effect then can be poor, and after extensive testing, when time constant is 700 sampling periods, noise reduction effect is to compare
Alright, certainly, in different usage scenarios, corresponding adjustment can also be made to time constant, to reach better noise reduction effect.
Step S20 carries out at amplitude adjustment the audio input signal according to the detection value of the envelope detection signal
Reason；
In the present embodiment, it when getting the corresponding envelope detection signal of the audio input signal, is examined according to envelope
The amplitude of the detection value adjustment audio input signal of wave signal.When the detection value of envelope detection signal is larger, it is defeated to increase audio
The amplitude for entering signal reduces the amplitude of audio input signal when the detection value of envelope detection signal is smaller, wherein can will examine
Wave number is compared with preset value, and to judge the size of detection value, and the gap between detection value and preset value is bigger, audio
The degree that the amplitude of input signal increases or reduces is also bigger.Further, since the amplitude of effectively sound is usually continually changing,
And the amplitude of noise element is then relatively stable, therefore, if the detection value of envelope detection signal change whithin a period of time it is smaller or
It does not change, then it, can be by the width of audio input signal it is believed that corresponding audio input signal only includes noise element at this time
Degree is down to predetermined amplitude, and predetermined amplitude is generally 0, is also able to achieve the purpose of noise reduction.If audio input signal is divided into multiple
Frequency band signals then can individually carry out amplitude adjustment processing to each frequency band signals.
Step S30, output amplitude adjustment treated the audio input signal.
In the present embodiment, after amplitude adjustment processing, can be by conventional audio output mode output amplitude adjustment at
The audio input signal after reason, the digital-to-analogue conversion etc. including signal.If defeated to audio when getting audio input signal
Enter signal and carried out scaling down processing, audio input signal has been divided into multiple frequency band signals, is then handled in output amplitude adjustment
Before the audio input signal afterwards, treated frequency band signals can be adjusted to amplitude and carry out Frequency mixing processing, according to the time
Sequencing reconfigures all frequency band signals, to obtain complete voice signal, and then passes through the dress such as loudspeaker
Set the complete voice signal of output.Since the noise reduction process of sound is usually the real-time perfoming when user uses stereo set,
Therefore the processing speed tool of processor there are certain requirements, to realize the DNR dynamic noise reduction process of voice signal, and exports in time
Voice signal.
Disclosed in the present embodiment in technical solution, the amplitude pair of noise element can be effectively filtered out by peak envelop detection
The detection value answered, and according to the amplitude of the corresponding adjustment audio input signal of the variation of the detection value of envelope detection signal, thus
Achieve the purpose that noise reduction, and noise reduction effect is more preferable.
In another embodiment, as shown in figure 3, on the basis of above-mentioned embodiment shown in Fig. 2, step S10 includes:
Step S11 carries out scaling down processing to the audio input signal, obtains multiple frequency band signals；
Step S12 carries out peak envelop detection processing to multiple frequency band signals respectively, obtains multiple envelope inspections
Wave signal.
In the present embodiment, when getting audio input signal, the frequency of audio input signal, different frequencies can be obtained
Rate corresponds to different frequency separations, and audio input signal is divided into multiple frequency band signals according to different frequency separations.In reality
When border operates, frequency segmentation can be carried out to audio input signal by bandpass filter, wherein bandpass filter allows specific
The wave of frequency range passes through, and shields other frequency ranges, to realize scaling down processing.It should be noted that in each frequency band signals, it should
The frequency of frequency band signals all changes in fixed frequency separation.The frequency range section specifically divided and quantity, can be according to processor
Processing capacity be adjusted, the frequency range generally divided is more, and noise reduction effect is better, and the distortion of sound is smaller.For example, common people
The frequency of sound is before 20 hertz to 20000 hertz, in the enough situations of processor processing capacity, with one hertz for a frequency
Rate section carries out scaling down processing, in this way, can reach better noise reduction effect when adjusting the amplitude of frequency band signals.
Disclosed in the present embodiment in technical solution, scaling down processing is carried out to the audio input signal, obtains multiple frequencies
Segment signal, and then peak envelop detection processing is carried out respectively to multiple frequency band signals, pass through the frequency of audio input signal
Variation, is divided into different frequency band signals for most effective sound and noise, so that in the width of adjustment audio input signal
Noise reduction effect is more preferable when spending, and the phenomenon that can reduce audio distortions.
In another embodiment, as shown in figure 4, on the basis of shown in Fig. 2 to Fig. 3 any embodiment, step S20 it
Before, further includes:
Step S01 determines detection amplification factor and detection threshold limit according to the detection value of the envelope detection signal；
In the present embodiment, after carrying out peak envelop detection processing to frequency band signals, obtained envelope detection signal
Detection value has a degree of decaying, therefore after peak envelop detection processing, can detection value to envelope detection signal into
Row enhanced processing, limitation processing etc., and using the detection value of treated envelope detection signal as the inspection of original envelope detection signal
Wave number carries out amplitude adjustment processing to carry out the detection value according to the envelope detection signal to the audio input signal
The step of.If audio input signal is divided into multiple frequency band signals, each frequency band signals can individually be amplified processing,
Limitation processing etc..Specifically, obtaining the detection value of envelope detection signal, and determine that the detection in enhanced processing is put according to detection value
Detection threshold limit in big multiple and limitation processing, so that the detection value of envelope detection signal increases, and avoids cutting as far as possible
The generation of wave distortion phenomenon.
Step S02 amplifies processing according to detection value of the detection amplification factor to the envelope detection signal；
Step S03, according to the detection threshold limit to the detection value of the envelope detection signal after enhanced processing into
Row limitation processing, and update according to the detection value of limitation treated the envelope detection signal inspection of the envelope detection signal
Wave number.
In the present embodiment, when detection value changes, corresponding detection amplification factor and detection threshold limit can also be corresponded to
Variation, and can be adjusted according to specifically used scene.In the process, generally first the detection value of envelope detection signal is carried out
Enhanced processing, then detection limitation processing is carried out to the envelope detection signal after enhanced processing, to avoid the hair of clipping distortion phenomenon
It is raw.Due to can still there is part inspection corresponding with the amplitude of noise element after envelope detection is handled, in envelope detection signal
Wave number, therefore the corresponding detection value of amplitude and noise that effective sound can be increased by amplifying the detection value of envelope detection signal
Gap between the corresponding detection value of the amplitude of ingredient, in this way, more accurate, the noise reduction when adjusting the amplitude of audio input signal
Effect is more preferable.Further, since the amplitude of signal is not unalterable, but it is continually changing at any time, therefore detection times magnification
Several and detection threshold limit can also be according to the amplitude dynamic change of signal, to realize dynamic noise reduction process.
Disclosed in the present embodiment in technical solution, processing and limit are amplified to the detection value of the envelope detection signal
System processing is to increase detection value, so that the amplitude adjustment of audio input signal is more accurate, to reach better noise reduction effect
Purpose.
In another embodiment, on the basis of as shown in figure 5, shown in Fig. 2 to Fig. 4 any embodiment, step S20 packet
It includes:
Step S21, judges whether the detection value of the envelope detection signal is greater than preset value；
It in the present embodiment, can be according to the detection value of envelope detection signal to audio after getting envelope detection signal
The amplitude of input signal carries out amplitude increase and decrease processing etc..Specifically, settable preset value, according to the size of detection value and preset value
Relationship increases or reduces the amplitude of audio input signal.
Step S22 increases the audio input letter when the detection value of the envelope detection signal is greater than the preset value
The amplitude of frequency band signals in number, wherein the detection value of the envelope detection signal and the difference of the preset value are bigger, described
The increase of the amplitude of frequency band signals is bigger；
Step S23 reduces the frequency band signals when the detection value of the envelope detection signal is less than the preset value
Amplitude, wherein the preset value and the difference of the detection value of the envelope detection signal are bigger, the amplitude of the frequency band signals
Reduction amount is bigger.
In the present embodiment, when detection value is greater than preset value, it is believed that signal mainly includes effective sound, the letter of signal
It makes an uproar than high, therefore the amplitude of audio input signal can be further increased, in this way, user can mainly hear width after signal output
Biggish effective sound is spent, and ignores the lesser noise of amplitude, to achieve the effect that reduce noise, wherein detection value and pre-
If the difference of value is bigger, indicating that signal-to-noise ratio is higher, the accessible noise reduction effect of amplitude for increasing audio input signal is better, because
The increase of the amplitude of this audio input signal can also be bigger.When detection value is less than preset value, it is believed that signal is predominantly made an uproar
The signal-to-noise ratio of sound, signal is low, therefore the amplitude for increasing audio input signal is unable to reach the effect for reducing noise, so can reduce
The amplitude of audio input signal, so that user reduces the susceptibility of noise, wherein preset value and the difference of detection value are bigger,
The reduction amount of the amplitude of audio input signal can also be bigger.As another feasible amplitude adjustment method, if envelope detection is believed
Number detection value do not change within a preset time or change too small, indicate that current corresponding audio input signal is noise,
Therefore the amplitude of noise can be adjusted to predetermined amplitude, under normal circumstances, predetermined amplitude zero, when there was only noise element in this way
Noise can be completely eliminated, to reach better noise reduction effect.Further, since the amplitude of signal is not unalterable, but with
Time is continually changing, thus the incrementss of amplitude adjustment processing and reduction amount can also according to the amplitude dynamic change of signal, with
Realize dynamic noise reduction process.It, can be independent to each frequency band signals if audio input signal is divided into multiple frequency band signals
Carry out amplitude adjustment, for example, if including effective sound in the frequency band signals of lower frequency, and wrapped in the frequency band signals of upper frequency
Noise is included, since the corresponding detection value of noise is general constant or varies less, at this point, can be by believing the frequency range of upper frequency
Number amplitude reduction to zero, and increase the amplitude of the frequency band signals of lower frequency, to improve signal-to-noise ratio, realize the mesh of noise reduction
's.
Disclosed in the present embodiment in technical solution, it is greater than the preset value in the detection value of the envelope detection signal
When, increase the amplitude of the frequency band signals in the audio input signal, is less than in the detection value of the envelope detection signal described
When preset value, reduce the amplitude of the frequency band signals, it is real according to the corresponding amplitude for adjusting audio input signal of the variation of detection value
Now reduce the purpose of noise.
In addition, the embodiment of the present invention also proposes a kind of denoising device of audio signal, the denoising device of the audio signal
It include: memory, processor and the noise reduction for being stored in the audio signal that can be run on the memory and on the processor
Program, the noise reduction program of the audio signal realize the drop of audio signal described in embodiment as above when being executed by the processor
The step of method for de-noising.
In addition, the embodiment of the present invention also proposes a kind of computer readable storage medium, the computer readable storage medium
On be stored with the noise reduction program of audio signal, the noise reduction program of the audio signal realizes embodiment as above when being executed by processor
The step of noise-reduction method of the audio signal.
In addition, the embodiment of the present invention also proposes a kind of noise reduction system of audio signal, the noise reduction system of the audio signal
Noise reduction program including audio signal, for the step of executing the noise-reduction method of audio signal described in embodiment as above.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that terminal device (it can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of noise-reduction method of audio signal, which is characterized in that the noise-reduction method of the audio signal the following steps are included:
When getting audio input signal, envelope corresponding with the audio input signal is obtained by peak envelop detection and is examined
Wave signal；
Amplitude adjustment processing is carried out to the audio input signal according to the detection value of the envelope detection signal；
Output amplitude adjustment treated the audio input signal.
2. the noise-reduction method of audio signal as described in claim 1, which is characterized in that described to get audio input signal
When, include: by the step of peak envelop detection acquisition envelope detection signal corresponding with the audio input signal
Scaling down processing is carried out to the audio input signal, obtains multiple frequency band signals；
Peak envelop detection processing is carried out to multiple frequency band signals respectively, obtains multiple envelope detection signals.
3. the noise-reduction method of audio signal as claimed in claim 2, which is characterized in that it is described to the audio input signal into
The step of row scaling down processing includes:
Obtain the frequency of the audio input signal；
Obtain the corresponding frequency separation of the frequency；
The audio input signal is divided into multiple frequency band signals according to the frequency separation.
4. the noise-reduction method of audio signal as described in claim 1, which is characterized in that described according to the envelope detection signal
Detection value to the audio input signal carry out amplitude adjustment processing the step of before, further includes:
Detection amplification factor and detection threshold limit are determined according to the detection value of the envelope detection signal；
Processing is amplified according to detection value of the detection amplification factor to the envelope detection signal；
Limitation processing is carried out according to detection value of the detection threshold limit to the envelope detection signal after enhanced processing, and
The detection value of the envelope detection signal is updated according to the detection value of limitation treated the envelope detection signal.
5. the noise-reduction method of audio signal as described in claim 1, which is characterized in that described according to the envelope detection signal
Detection value to the audio input signal carry out amplitude adjustment processing the step of include:
Judge whether the detection value of the envelope detection signal is greater than preset value；
When the detection value of the envelope detection signal is greater than the preset value, increase the frequency range letter in the audio input signal
Number amplitude, wherein the detection value of the envelope detection signal and the difference of the preset value are bigger, the width of the frequency band signals
The increase of degree is bigger；
When the detection value of the envelope detection signal is less than the preset value, reduce the amplitude of the frequency band signals, wherein institute
It states preset value and the difference of the detection value of the envelope detection signal is bigger, the reduction amount of the amplitude of the frequency band signals is bigger.
6. the noise-reduction method of audio signal as described in claim 1, which is characterized in that described according to the envelope detection signal
Detection value to the audio input signal carry out amplitude adjustment processing the step of include:
Judge whether the detection value of the envelope detection signal within a preset time changes；
When the detection value of the envelope detection signal does not change within a preset time, by the frequency in the audio input signal
The amplitude of segment signal is adjusted to predetermined amplitude.
7. the noise-reduction method of audio signal as described in claim 1, which is characterized in that treated for the output amplitude adjustment
The step of audio input signal includes:
Frequency mixing processing is carried out to multiple frequency band signals in amplitude adjustment treated the audio input signal, it is defeated to obtain audio
Signal out；
Export the audio output signal.
8. a kind of denoising device of audio signal, which is characterized in that the denoising device of the audio signal includes: memory, place
Reason device and the noise reduction program for being stored in the audio signal that can be run on the memory and on the processor, the audio letter
Number noise reduction program the noise reduction of the audio signal as described in any one of claims 1 to 7 is realized when being executed by the processor
The step of method.
9. a kind of computer readable storage medium, which is characterized in that be stored with audio letter on the computer readable storage medium
Number noise reduction program, when the noise reduction program of the audio signal is executed by processor realize such as any one of claims 1 to 7 institute
The step of noise-reduction method for the audio signal stated.
10. a kind of noise reduction system of audio signal, which is characterized in that the noise reduction system of the audio signal includes audio signal
Noise reduction program, for the step of executing the noise-reduction method of the audio signal as described in any one of claims 1 to 7.
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