CN107123429A - The auto gain control method and device of audio signal - Google Patents
The auto gain control method and device of audio signal Download PDFInfo
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- CN107123429A CN107123429A CN201710174534.XA CN201710174534A CN107123429A CN 107123429 A CN107123429 A CN 107123429A CN 201710174534 A CN201710174534 A CN 201710174534A CN 107123429 A CN107123429 A CN 107123429A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
- G10L21/0324—Details of processing therefor
- G10L21/034—Automatic adjustment
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/40—Combined gain and bias control
Abstract
The invention discloses the auto gain control method of audio signal and device.Methods described includes：Whether the audio signal for detecting microphone array pickup is voice signal；When audio signal is voice signal, the Sounnd source direction of audio signal is detected；If the Sounnd source direction that audio signal is voice signal and audio signal is preset direction, automatic growth control program is performed, the output gain of audio signal is automatically adjusted；Otherwise, audio signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise.The embodiment of the present invention realizes the intelligent control to audio signal gain.
Description
Technical field
The present invention relates to audio frequency control field, more particularly to the auto gain control method of audio signal, audio signal
Automatic gain control equipment.
Background technology
In the prior art, the method for automatic growth control (Automatic Gain Control, AGC) has many kinds,
In its course of work, gain control module is according to the amplitude of backfeed loop, threshold value in system, using certain AGC algorithms, to increasing
Beneficial value is adjusted.Such an approach achieves automatically controlling for gain, but noise signal understands and useful signal amplify together, unfavorable
In noise reduction process.
The content of the invention
It is an object of the invention to provide a kind of technical scheme of the automatic growth control of audio signal, with automatic gain
The adverse effect of noise is reduced in control process.
There is provided a kind of auto gain control method of audio signal, including following step according to the first aspect of the invention
Suddenly：Whether the audio signal for detecting microphone array pickup is voice signal；When audio signal is voice signal, audio is detected
The Sounnd source direction of signal；If the Sounnd source direction that audio signal is voice signal and audio signal is preset direction, perform
Automatic growth control program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, by audio
The output gain of signal is adjusted to preset value to suppress noise.
There is provided a kind of auto gain control method of audio signal, including following step according to the second aspect of the invention
Suddenly：Whether the audio signal for detecting microphone system pickup is voice signal；If audio signal is not voice signal, audio
Signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise；It is single Mike to determine microphone system
Wind or microphone array；If audio signal is voice signal and microphone system is single microphone, automatic increase is performed
Beneficial control program, automatically adjusts to the output gain of audio signal；If audio signal is voice signal and microphone
System is microphone array, then whether the Sounnd source direction for detecting audio signal is preset direction, if preset direction, is then performed
Automatic growth control program, automatically adjusts to the output gain of audio signal, otherwise, and audio signal is noise, by audio
The output gain of signal is adjusted to preset value to suppress noise.
Alternatively, methods described is applied to during interactive voice.
Alternatively, the automatic growth control program comprises the following steps：The output gain and target of comparing audio signal
Gain；If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；If audio
The output gain of signal is more than target gain, then performs following operate：By the numerical value increase of the first counter in the lump by the second meter
The numerical value of number device is reset；Judge whether to meet gain and turn down any one in condition, if it is satisfied, then by the defeated of audio signal
Go out gain and turn down one-level, otherwise keep the output gain of audio signal constant；Condition is turned down in the gain：Audio signal it is defeated
The absolute difference for going out gain and target gain is more than first threshold, or, the numerical value of the first counter is more than Second Threshold；Such as
The output gain of fruit audio signal is less than target gain, then performs following operate：The numerical value of first counter is reset and by the
The numerical value increase by one of two counters；Judge whether to meet gain and heighten any one in condition, if it is satisfied, then audio is believed
Number output gain heighten one-level, otherwise keep audio signal output gain it is constant；Condition is heightened in the gain：Audio is believed
Number output gain and the absolute difference of target gain be more than the 3rd threshold value, or, the numerical value of the second counter is more than the 4th
Threshold value.
Alternatively, if the output gain of audio signal is equal to target gain, by the first counter and the second counter
Numerical value reset.
According to the third aspect of the invention we there is provided a kind of automatic gain control equipment of audio signal, including voice inspection
Survey module, Sounnd source direction detection module and gain adjustment module；The speech detection module, is configured as detecting microphone
Whether the audio signal of array pickup is voice signal；The Sounnd source direction detection module, is configured as audio signal for language
During message, the Sounnd source direction of audio signal is detected；The gain adjustment module, believes if being configured as audio signal for voice
Number and the Sounnd source direction of audio signal is preset direction, then perform automatic growth control program, the output of audio signal increased
Benefit automatically adjusts；Otherwise, audio signal is noise, and the output gain of audio signal is adjusted into preset value to suppress to make an uproar
Sound.
There is provided a kind of automatic gain control equipment of audio signal, described device bag according to the fourth aspect of the invention
Include speech detection module, Sounnd source direction detection module and gain adjustment module；The speech detection module, is configured as inspection
Whether the audio signal for surveying microphone system pickup is voice signal；The Sounnd source direction detection module, is configured as in Mike
In the case that wind system is microphone array, if audio signal is voice signal, the Sounnd source direction of audio signal is detected；Institute
Gain adjustment module is stated, is configured as：In the case where microphone system is single microphone, if audio signal is believed for voice
Number, then automatic growth control program is performed, the output gain of audio signal is automatically adjusted；Otherwise, audio signal is to make an uproar
Sound, the output gain of audio signal is adjusted to preset value to suppress noise；It is the situation of microphone array in microphone system
Under, if the Sounnd source direction that audio signal is voice signal and audio signal is preset direction, perform automatic growth control
Program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, and the output of audio signal is increased
Benefit is adjusted to preset value to suppress noise.
Alternatively, described device also includes the first counter and the second counter；The gain adjustment module performs automatic
Gain control program, automatically adjusts to the output gain of audio signal, including：The output gain and mesh of comparing audio signal
Mark gain；If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；If sound
The output gain of frequency signal is more than target gain, then performs following operate：By the numerical value increase of the first counter in the lump by second
The numerical value of counter is reset；Judge whether to meet gain and turn down any one in condition, if it is satisfied, then by audio signal
Output gain turns down one-level, otherwise keeps the output gain of audio signal constant；Condition is turned down in the gain：Audio signal
The absolute difference of output gain and target gain is more than first threshold, or, the numerical value of the first counter is more than Second Threshold；
If the output gain of audio signal is less than target gain, following operate is performed：The numerical value of first counter is reset and incited somebody to action
The numerical value increase by one of second counter；Judge whether to meet gain and heighten any one in condition, if it is satisfied, then by audio
The output gain of signal heightens one-level, otherwise keeps the output gain of audio signal constant；Condition is heightened in the gain：Audio
The output gain of signal and the absolute difference of target gain are more than the 3rd threshold value, or, the numerical value of the second counter is more than the
Four threshold values.
Alternatively, the gain adjustment module performs automatic growth control program, and the output gain of audio signal is carried out
Automatically adjust, in addition to：If the output gain of audio signal is equal to target gain, by the first counter and the second counter
Numerical value reset.
According to the fifth aspect of the invention there is provided a kind of voice interaction device, provided with according to foregoing any one
Automatic gain control equipment.
The present invention recognizes whether the audio signal that microphone array is picked up is voice signal by speech detection, when audio letter
Number it is voice signal and when its Sounnd source direction is preset direction, the output gain of audio signal is automatically adjusted, otherwise
The output gain of audio signal is adjusted to preset value to suppress noise.The present invention realizes the intelligence control to audio signal gain
System.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described.It should be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore it is not construed as pair
The restriction of scope.For those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows the flow signal of the auto gain control method for the audio signal that first embodiment of the invention is provided
Figure.
Fig. 2 shows the flow signal of the auto gain control method for the audio signal that second embodiment of the invention is provided
Figure.
Fig. 3 shows the flow signal of the auto gain control method for the audio signal that third embodiment of the invention is provided
Figure.
Fig. 4 shows the block diagram of the automatic gain control equipment for the audio signal that first embodiment of the invention is provided.
Fig. 5 shows the block diagram of the automatic gain control equipment for the audio signal that second embodiment of the invention is provided.
Fig. 6 shows the block diagram of the automatic gain control equipment for the audio signal that third embodiment of the invention is provided.
Fig. 7 shows the block diagram of the automatic gain control equipment for the audio signal that fourth embodiment of the invention is provided.
Fig. 8 shows the block diagram of the hardware configuration of voice communication assembly provided in an embodiment of the present invention.
Embodiment
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that：Unless had in addition
Body illustrates that the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments does not limit this
The scope of invention.
The description only actually at least one exemplary embodiment is illustrative below, never as to the present invention
And its any limitation applied or used.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as a part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
The auto gain control method and device of audio signal provided in an embodiment of the present invention can apply to voice collecting
In equipment or interactive voice equipment or voice communication apparatus, such as mobile phone, audiphone, microphone, recorder, interactive voice machine
The equipment such as people, the audio signal to the microphone system collection of equipment carries out gain control.The signified voice of the embodiment of the present invention
Communicator can be, for example, mobile phone, landline telephone, be equipped with wechat etc. have voice transmission capabilities application smart machine
Deng.
Illustrate the auto gain control method for the audio signal that first embodiment of the invention is provided with reference to Fig. 1, it is adaptable to have
There is the voice capture device of microphone array, comprise the following steps：
101st, whether the audio signal of detection microphone array pickup is voice signal.
In step 101, picked up using speech detection technology (Voice Active Detector, VAD) detection microphone array
Whether the audio signal taken is voice signal.Before speech detection, framing first can be carried out to audio signal, if for example,
The sample frequency of microphone array is 8000Hz, then a frame 10ms data lengths are 80 sampled points, if microphone array
Sample frequency is 16000Hz, then a frame 10ms data lengths are 160 sampled points.Speech detection is carried out by frame.Speech detection
Method has many kinds, and those skilled in the art can be selected according to practical application request.
102nd, when audio signal is voice signal, the Sounnd source direction of audio signal is detected.
In step 102, beamforming algorithm can be used to detect the Sounnd source direction of audio signal, that is, detect that voice is from which
What individual direction was sent.
If the 103, audio signal is that the Sounnd source direction of voice signal and audio signal is preset direction, perform automatic
Gain control program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, by audio signal
Output gain preset value is adjusted to suppress noise.
If voice capture device is mobile phone, the effect of microphone array is to gather the voice that user sends, then presets
Direction could be arranged to user's voice directions.If voice capture device be audiphone, the effect of microphone array be so that
User can hear the voice sent for the object talked with it, then preset direction could be arranged in front of user in certain distance
Voice directions.That is, those skilled in the art can contemplate the purposes of voice capture device, user's occupation mode etc. because
The preset direction is usually set, when voice capture device is dispatched from the factory, preset direction can be arranged on voice collecting and set
In standby, preset direction is read in direct slave unit.
Sounnd source direction detection by step 102, if the Sounnd source direction of audio signal is preset direction, then it is assumed that audio
Signal is the voice that user wants collection, performs automatic growth control program, the output gain of audio signal is adjusted automatically
Section.
In addition to a kind of upper situation, if it is not voice signal, audio letter that the testing result of step 101, which is audio signal,
Number it is the undesired noise of user, the output gain of audio signal is adjusted to preset value to suppress noise；If step 101
Testing result is that audio signal is voice signal, but the Sounnd source direction of audio signal is not preset direction, illustrates that user may
In a noisy environment, audio signal is not the voice that user wants collection, and audio signal belongs to noise, audio is believed
Number output gain preset value is adjusted to suppress noise.
Auto gain control method provided in an embodiment of the present invention, with reference to speech detection technology and sound source angle detecting skill
Art, only in the case of it is determined that audio signal is the voice that user wants collection, is just carried out to the output gain of audio signal
Automatically adjust, otherwise be adjusted to preset value to suppress noise by the output gain of audio signal, it is to avoid mistakenly amplify noise.
Illustrate the auto gain control method for the audio signal that second embodiment of the invention is provided with reference to Fig. 2, it is adaptable to have
There is the voice capture device of single microphone or microphone array, comprise the following steps：
201st, whether the audio signal of detection microphone system pickup is voice signal.Step 201 and step 101 some classes
Seemingly, explanation is not repeated herein.
202nd, it is single microphone or microphone array to determine microphone system.
Microphone system is single microphone or microphone array, is the characteristic of voice capture device itself, can be direct
It is confirmed.The audio signal that can also be picked up according to microphone system judges that microphone system is single microphone or microphone
Array, those skilled in the art can have a variety of methods to be judged, no longer illustrate here.Step 202 can also be in step 201
Speech detection step before perform.
If the 203, audio signal is voice signal and microphone system is single microphone, automatic growth control is performed
Program, automatically adjusts to the output gain of audio signal.If audio signal is voice signal and microphone system
Microphone array, then whether the Sounnd source direction for detecting audio signal is preset direction, if preset direction, then performs automatic increase
Beneficial control program, automatically adjusts to the output gain of audio signal, otherwise, and audio signal is noise, by audio signal
Output gain is adjusted to preset value to suppress noise.
That is, when microphone system is single microphone：If audio signal is voice signal, perform
Automatic growth control program, automatically adjusts to the output gain of audio signal, otherwise, and audio signal is noise, by audio
The output gain of signal is adjusted to preset value to suppress noise.
It is similar with first embodiment when microphone system is microphone array：It is language only in audio signal
In the case that the Sounnd source direction of message number and audio signal is preset direction, it is that user wants collection just to think audio signal
Voice, performs automatic growth control program, the output gain of audio signal is automatically adjusted, otherwise it is assumed that audio signal
For noise, the output gain of audio signal is adjusted to preset value to suppress noise.First embodiment specifically is may refer to, here
It is no longer to explain more.
Auto gain control method provided in an embodiment of the present invention, with reference to speech detection technology and sound source angle detecting skill
Art, only in the case of it is determined that audio signal is the voice that user wants collection, is just carried out to the output gain of audio signal
Automatically adjust, otherwise be adjusted to preset value to suppress noise by the output gain of audio signal, it is to avoid mistakenly amplify noise.
This embodiment versatility is stronger, it is adaptable to the voice capture device with single microphone or microphone array.
Illustrate the auto gain control method for the audio signal that third embodiment of the invention is provided with reference to Fig. 3, it is adaptable to have
There is the voice capture device of single microphone or microphone array, comprise the following steps：
301st, speech detection is carried out for the audio signal that microphone system is picked up, performs step 302.
302nd, judge whether audio signal is voice signal according to testing result, if it is not, then thinking that audio signal is
Noise, performs step 303, otherwise performs step 304.
Step 303, the output gain of audio signal is adjusted to preset value to suppress noise.
Step 304, confirmation microphone system are single microphone or microphone array, if microphone system is single Mike
Wind, then perform step 307；If microphone system is microphone array, step 305 is performed.
Step 305, the Sounnd source direction for detecting audio signal, perform step 306.
Step 306, judge whether Sounnd source direction is preset direction, if it is, step 307 is performed, otherwise it is assumed that audio
Signal is noise, performs step 303.
Step 307, relatively more current output gain and target gain, if current output gain is equal to target gain,
Then perform step 308.If current output gain is more than target gain, step 309 is performed.If current output gain
Less than target gain, then step 312 is performed.
Step 309, the numerical value increase by one by the first counter, the numerical value of the second counter is reset, step 310 is performed.
Step 310, judge whether to meet gain and turn down any one in condition, it is audio signal that condition is turned down in gain
The absolute difference of output gain and target gain is more than first threshold, or, the numerical value of the first counter is more than Second Threshold.
First threshold is more than 0dB, and Second Threshold is more than 1.
In one embodiment, first threshold is 2dB, and Second Threshold is 3, it was found from step 307,309,310, in step
In 310：
If the output gain of audio signal and the absolute difference of target gain are more than 2dB, illustrate and target gain phase
Than the output gain of audio signal is excessive, meets gain and turns down condition.
If the numerical value of the first counter is more than 3, illustrate that at least continuous 4 times of the output gain of audio signal is more than target increasing
Benefit, meets gain and turns down condition.
In other embodiments, first threshold and Second Threshold can be set according to the actual requirements.
If meeting gain turns down condition, step 311 is performed, output gain is turned down into one-level, for example, turns down 0.2dB；
If being unsatisfactory for gain turns down condition, step 308 is performed, the current output gain of holding is constant.Then perform step 315 and
Step 316, output gain is stored, according to output gain exports audio signal.That is, in this embodiment, only defeated
Go out gain continuously be more than target gain it is multiple in the case of, or output gain beyond target gain it is many in the case of,
Output gain is turned down into one-level.
Step 312, the numerical value clearing by the first counter, increase by one by the numerical value of the second counter, perform step 313.
Step 313, judge whether to meet gain and heighten any one in condition, it is audio signal that condition is heightened in gain
The absolute difference of output gain and target gain is more than the 3rd threshold value, or, the numerical value of the second counter is more than the 4th threshold value.
3rd threshold value is more than 0dB, and the 4th threshold value is more than 1.
In one embodiment, the 3rd threshold value is 2dB, and the 4th threshold value is 3, it was found from step 307,312,313, in step
In 313：
If the output gain of audio signal and the absolute difference of target gain are more than 2dB, illustrate and target gain phase
Than the output gain of audio signal is too small, meets gain and heightens condition.
If the numerical value of the second counter is more than 3, illustrate that at least continuous 4 times of the output gain of audio signal is less than target increasing
Benefit, meets gain and heightens condition.
In other embodiments, the 3rd threshold value and the 4th threshold value can be set according to the actual requirements.
If meeting gain heightens condition, step 314 is performed, output gain is heightened into one-level, for example, heightens 0.2dB；
If being unsatisfactory for gain heightens condition, step 308 is performed, the current output gain of holding is constant.Then perform step 315 and
Step 316, output gain is stored, according to output gain exports audio signal.That is, in this embodiment, only defeated
Go out gain continuously be less than target gain it is multiple in the case of, or output gain be less than target gain it is many in the case of,
Output gain is heightened into one-level.
Auto gain control method provided in an embodiment of the present invention, with reference to speech detection technology and sound source angle detecting skill
Art, only in the case of it is determined that audio signal is the voice that user wants collection, is just carried out to the output gain of audio signal
Automatically adjust, otherwise be adjusted to preset value to suppress noise by the output gain of audio signal, it is to avoid mistakenly amplify noise.
This embodiment versatility is stronger, it is adaptable to the voice capture device with single microphone or microphone array.This embodiment
There is provided specific automatic growth control program, regulation step by step is carried out to output gain makes output gain gradually draw close target increasing
Benefit, it is to avoid output gain frequently swings in target gain.
To those skilled in the art, can be real by way of hardware mode, software mode or software and hardware combining
Existing foregoing auto gain control method.Based on same inventive concept, the audio signal of the embodiment of the present invention is introduced with reference to Fig. 4-7
Automatic gain control equipment, to perform the automatic growth control scheme of aforementioned audio signal.
Fig. 4 shows the block diagram of the automatic gain control equipment for the audio signal that first embodiment of the invention is provided, including
Speech detection module 11, Sounnd source direction detection module 12 and gain adjustment module 13.
Speech detection module 11, whether the audio signal for being configured as detecting microphone array pickup is voice signal.
Sounnd source direction detection module 12, when being configured as audio signal for voice signal, detects the sound source of audio signal
Direction.
Gain adjustment module 13, be if being configured as the Sounnd source direction that audio signal is voice signal and audio signal
Preset direction, then perform automatic growth control program, the output gain of audio signal automatically adjusted；Otherwise, audio is believed
Number be noise, the output gain of audio signal is adjusted to preset value to suppress noise.
Fig. 5 shows the block diagram of the automatic gain control equipment for the audio signal that second embodiment of the invention is provided, including
Speech detection module 21, Sounnd source direction detection module 22, gain adjustment module 23, the first counter 24 and the second counter 25.
Speech detection module 21, whether the audio signal for being configured as detecting microphone array pickup is voice signal.
Sounnd source direction detection module 22, when being configured as audio signal for voice signal, detects the sound source of audio signal
Direction.
Gain adjustment module 23, be if being configured as the Sounnd source direction that audio signal is voice signal and audio signal
Preset direction, then perform automatic growth control program, the output gain of audio signal automatically adjusted；Otherwise, audio is believed
Number be noise, the output gain of audio signal is adjusted to preset value to suppress noise.
Gain adjustment module 23 performs automatic growth control program, and the output gain of audio signal is automatically adjusted,
Including：
The output gain and target gain of comparing audio signal；
If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；
If the output gain of audio signal is more than target gain, following operate is performed：By the number of the first counter 24
Value increase in the lump resets the numerical value of the second counter 25；Judge whether to meet gain and turn down any one in condition, if
Meet, then the output gain of audio signal is turned down into one-level, otherwise keep the output gain of audio signal constant；The gain is adjusted
Low condition is：The output gain of audio signal and the absolute difference of target gain are more than first threshold, or, the first counter
24 numerical value is more than Second Threshold.First threshold is more than 0dB, and Second Threshold is more than 1.
If the output gain of audio signal is less than target gain, following operate is performed：By the number of the first counter 24
Value resets and the numerical value of the second counter 25 is increased into one；Judge whether to meet gain and heighten any one in condition, if
Meet, then the output gain of audio signal is heightened into one-level, otherwise keep the output gain of audio signal constant；The gain is adjusted
High condition is：The output gain of audio signal and the absolute difference of target gain are more than the 3rd threshold value, or, the second counter
25 numerical value is more than the 4th threshold value.3rd threshold value is more than 0dB, and the 4th threshold value is more than 1.
Fig. 6 shows the block diagram of the automatic gain control equipment for the audio signal that third embodiment of the invention is provided, including
Speech detection module 31, Sounnd source direction detection module 32 and gain adjustment module 33.
Speech detection module 31, whether the audio signal for being configured as detecting microphone system pickup is voice signal.
Sounnd source direction detection module 32, is configured as in the case where microphone system is microphone array, if audio
Signal is voice signal, then detects the Sounnd source direction of audio signal.
Gain adjustment module 33, is configured as：
In the case where microphone system is single microphone, if audio signal is voice signal, automatic gain is performed
Control program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, by the defeated of audio signal
Go out Gain tuning for preset value to suppress noise；
In the case where microphone system is microphone array, if audio signal is voice signal and audio signal
Sounnd source direction is preset direction, then performs automatic growth control program, the output gain of audio signal is automatically adjusted；It is no
Then, audio signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise.
Fig. 7 shows the block diagram of the automatic gain control equipment for the audio signal that fourth embodiment of the invention is provided, including
Speech detection module 41, Sounnd source direction detection module 42, gain adjustment module 43, the first counter 44 and the second counter 45.
Speech detection module 41, whether the audio signal for being configured as detecting microphone system pickup is voice signal.
Sounnd source direction detection module 42, is configured as in the case where microphone system is microphone array, if audio
Signal is voice signal, then detects the Sounnd source direction of audio signal.
Gain adjustment module 43, is configured as：
In the case where microphone system is single microphone, if audio signal is voice signal, automatic gain is performed
Control program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, by the defeated of audio signal
Go out Gain tuning for preset value to suppress noise；
In the case where microphone system is microphone array, if audio signal is voice signal and audio signal
Sounnd source direction is preset direction, then performs automatic growth control program, the output gain of audio signal is automatically adjusted；It is no
Then, audio signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise.
Gain adjustment module 43 performs automatic growth control program, and the output gain of audio signal is automatically adjusted,
Including：
The output gain and target gain of comparing audio signal；
If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；
If the output gain of audio signal is more than target gain, following operate is performed：By the number of the first counter 44
Value increase in the lump resets the numerical value of the second counter 45；Judge whether to meet gain and turn down any one in condition, if
Meet, then the output gain of audio signal is turned down into one-level, otherwise keep the output gain of audio signal constant；The gain is adjusted
Low condition is：The output gain of audio signal and the absolute difference of target gain are more than first threshold, or, the first counter
44 numerical value is more than Second Threshold.First threshold is more than 0dB, and Second Threshold is more than 1.
If the output gain of audio signal is less than target gain, following operate is performed：By the number of the first counter 44
Value resets and the numerical value of the second counter 45 is increased into one；Judge whether to meet gain and heighten any one in condition, if
Meet, then the output gain of audio signal is heightened into one-level, otherwise keep the output gain of audio signal constant；The gain is adjusted
High condition is：The output gain of audio signal and the absolute difference of target gain are more than the 3rd threshold value, or, the second counter
45 numerical value is more than the 4th threshold value.3rd threshold value is more than 0dB, and the 4th threshold value is more than 1.
Fig. 8 is the frame for the example for showing the hardware configuration available for the voice communication assembly for realizing embodiments of the invention
Figure.Voice communication assembly 3000 includes processor 3010, memory 3020, interface arrangement 3030, Wireless/wired communication module
3040th, display device 3050, input unit 3060, loudspeaker 3070, microphone 3080, etc..
Memory 3020 is used for store instruction, and the instruction is operated to perform before for control processor 3010
State the auto gain control method of the audio signal described in any one.
Processor 3010 is such as can be central processor CPU, Micro-processor MCV.Memory 3020 is for example including ROM
(read-only storage), RAM (random access memory), the nonvolatile memory of hard disk etc..Interface arrangement 3030 is for example
Including USB interface, earphone interface etc..Wired or wireless communication can for example be carried out by leading to Wireless/wired communication module 3040.Display
Device 3050 is, for example, LCDs, touch display screen etc..Input unit 3060 is such as can include touch-screen, keyboard.
User can pass through loudspeaker 3070 and the inputting/outputting voice information of microphone 3080.
Terminal device shown in Fig. 8 is only explanatory, and is never intended to the limitation present invention, its application or uses
On the way.Although it will be appreciated by those skilled in the art that figure 8 illustrates multiple devices, the present invention can be only related to wherein
Partial devices.Those skilled in the art can instruct according to presently disclosed conceptual design, instruction how control processor
It is techniques well known to carry out operation, therefore is not described in detail herein.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation be all between difference with other embodiment, each embodiment identical similar part mutually referring to.
But make it will be clear for those skilled in the art that the various embodiments described above can be used alone or be combined with each other as needed
With.In addition, for device embodiment, because it is corresponding with embodiment of the method, so describe fairly simple, it is related
Part referring to the corresponding part of embodiment of the method explanation.Device embodiment described above be only it is schematical,
It is not physically separate that the module wherein illustrated as separating component, which can be or may also be,.
In addition, the flow chart and block diagram in accompanying drawing show device, method and the meter of multiple embodiments according to the present invention
Architectural framework in the cards, function and the operation of calculation machine program product.At this point, each square frame in flow chart or block diagram
Can represent a part for a module, program segment or code, the part of the module, program segment or code comprising one or
Multiple executable instructions for being used to realize defined logic function.It should also be noted that in some realizations as replacement, square frame
Middle marked function can also be with different from the order marked in accompanying drawing generation.For example, two continuous square frames are actually
It can perform substantially in parallel, they can also be performed in the opposite order sometimes, this is depending on involved function.Also to note
Meaning, the combination of each square frame in block diagram and/or flow chart and the square frame in block diagram and/or flow chart can be with holding
The special hardware based device of function or action as defined in row is realized, or can use specialized hardware and computer instruction
Combination realize.
The computer program product that the embodiment of the present invention is provided, including store the computer-readable storage of program code
Medium, the instruction that described program code includes can be used for performing the method described in previous methods embodiment, and implementing to join
See embodiment of the method, will not be repeated here.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the device of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
, can be with several embodiments provided herein, it should be understood that disclosed device, apparatus and method
Realize by another way.Device embodiment described above is only schematical, for example, the division of the unit,
It is only a kind of division of logic function, there can be other dividing mode when actually realizing, in another example, multiple units or component can
To combine or be desirably integrated into another device, or some features can be ignored, or not perform.It is another, it is shown or beg for
The coupling each other of opinion or direct-coupling or communication connection can be by some communication interfaces, device or unit it is indirect
Coupling is communicated to connect, and can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized using in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Understood based on such, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are to cause a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each of the invention embodiment methods described.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.It should be noted that：Similar label and letter exists
Similar terms is represented in following accompanying drawing, therefore, once being defined in a certain Xiang Yi accompanying drawing, is then not required in subsequent accompanying drawing
It is further defined and explained.
Although some specific embodiments of the present invention are described in detail by example, the skill of this area
Art personnel are it should be understood that example above is merely to illustrate, the scope being not intended to be limiting of the invention.The skill of this area
Art personnel to above example it should be understood that can modify without departing from the scope of the invention.The model of the present invention
Enclose and be defined by the following claims.
Claims (10)
1. a kind of auto gain control method of audio signal, it is characterised in that comprise the following steps：
Whether the audio signal for detecting microphone array pickup is voice signal；
When audio signal is voice signal, the Sounnd source direction of audio signal is detected；
If the Sounnd source direction that audio signal is voice signal and audio signal is preset direction, automatic growth control is performed
Program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, and the output of audio signal is increased
Benefit is adjusted to preset value to suppress noise.
2. a kind of auto gain control method of audio signal, it is characterised in that comprise the following steps：
Whether the audio signal for detecting microphone system pickup is voice signal；
If audio signal is not voice signal, audio signal is noise, and the output gain of audio signal is adjusted into default
Value is to suppress noise；
It is single microphone or microphone array to determine microphone system；
If audio signal is voice signal and microphone system is single microphone, automatic growth control program is performed, it is right
The output gain of audio signal automatically adjusts；
If audio signal is voice signal and microphone system is microphone array, the Sounnd source direction of audio signal is detected
Whether it is preset direction, if preset direction, then performs automatic growth control program, the output gain of audio signal is carried out
Automatically adjust, otherwise, audio signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise.
3. the method according to any one of claim 1 or 2, it is characterised in that methods described is applied to interactive voice process
In.
4. the method according to any one of claim 1 or 2, it is characterised in that the automatic growth control program include with
Lower step：
The output gain and target gain of comparing audio signal；
If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；
If the output gain of audio signal is more than target gain, following operate is performed：
The numerical value increase of first counter is in the lump reset the numerical value of the second counter；
Judge whether to meet gain and turn down any one in condition, if it is satisfied, then the output gain of audio signal is turned down
One-level, otherwise keeps the output gain of audio signal constant；
Condition is turned down in the gain：The output gain of audio signal and the absolute difference of target gain are more than first threshold,
Or, the numerical value of the first counter is more than Second Threshold；
If the output gain of audio signal is less than target gain, following operate is performed：
The numerical value of first counter is reset and the numerical value of the second counter is increased by one；
Judge whether to meet gain and heighten any one in condition, if it is satisfied, then the output gain of audio signal is heightened
One-level, otherwise keeps the output gain of audio signal constant；
Condition is heightened in the gain：The output gain of audio signal and the absolute difference of target gain are more than the 3rd threshold value,
Or, the numerical value of the second counter is more than the 4th threshold value.
5. method according to claim 4, it is characterised in that if the output gain of audio signal is equal to target gain,
Then the numerical value of the first counter and the second counter is reset.
6. a kind of automatic gain control equipment of audio signal, it is characterised in that detected including speech detection module, Sounnd source direction
Module and gain adjustment module；
The speech detection module, whether the audio signal for being configured as detecting microphone array pickup is voice signal；
The Sounnd source direction detection module, when being configured as audio signal for voice signal, detects the sound source side of audio signal
To；
The gain adjustment module, if it is pre- to be configured as the Sounnd source direction that audio signal is voice signal and audio signal
Set direction, then perform automatic growth control program, the output gain of audio signal automatically adjusted；Otherwise, audio signal
For noise, the output gain of audio signal is adjusted to preset value to suppress noise.
7. a kind of automatic gain control equipment of audio signal, it is characterised in that detected including speech detection module, Sounnd source direction
Module and gain adjustment module；
The speech detection module, whether the audio signal for being configured as detecting microphone system pickup is voice signal；
The Sounnd source direction detection module, is configured as in the case where microphone system is microphone array, if audio is believed
Number be voice signal, then detect audio signal Sounnd source direction；
The gain adjustment module, is configured as：
In the case where microphone system is single microphone, if audio signal is voice signal, automatic growth control is performed
Program, automatically adjusts to the output gain of audio signal；Otherwise, audio signal is noise, and the output of audio signal is increased
Benefit is adjusted to preset value to suppress noise；
In the case where microphone system is microphone array, if audio signal is the sound source of voice signal and audio signal
Direction is preset direction, then performs automatic growth control program, the output gain of audio signal is automatically adjusted；Otherwise,
Audio signal is noise, and the output gain of audio signal is adjusted to preset value to suppress noise.
8. the device according to any one of claim 6 or 7, it is characterised in that described device also include the first counter and
Second counter；
The gain adjustment module performs automatic growth control program, and the output gain of audio signal is automatically adjusted, and wraps
Include：
The output gain and target gain of comparing audio signal；
If the output gain of audio signal is equal to target gain, keep the output gain of audio signal constant；
If the output gain of audio signal is more than target gain, following operate is performed：
The numerical value increase of first counter is in the lump reset the numerical value of the second counter；
Judge whether to meet gain and turn down any one in condition, if it is satisfied, then the output gain of audio signal is turned down
One-level, otherwise keeps the output gain of audio signal constant；
Condition is turned down in the gain：The output gain of audio signal and the absolute difference of target gain are more than first threshold,
Or, the numerical value of the first counter is more than Second Threshold；
If the output gain of audio signal is less than target gain, following operate is performed：
The numerical value of first counter is reset and the numerical value of the second counter is increased by one；
Judge whether to meet gain and heighten any one in condition, if it is satisfied, then the output gain of audio signal is heightened
One-level, otherwise keeps the output gain of audio signal constant；
Condition is heightened in the gain：The output gain of audio signal and the absolute difference of target gain are more than the 3rd threshold value,
Or, the numerical value of the second counter is more than the 4th threshold value.
9. device according to claim 8, it is characterised in that the gain adjustment module performs automatic growth control journey
Sequence, automatically adjusts to the output gain of audio signal, in addition to：
If the output gain of audio signal is equal to target gain, the numerical value of the first counter and the second counter is reset.
10. a kind of voice interaction device, it is characterised in that provided with the automatic gain control according to claim any one of 6-9
Device processed.
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| CN201710174534.XA CN107123429A (en) | 2017-03-22 | 2017-03-22 | The auto gain control method and device of audio signal |
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| CN110111805A (en) * | 2019-04-29 | 2019-08-09 | 北京声智科技有限公司 | Auto gain control method, device and readable storage medium storing program for executing in the interactive voice of far field |
| CN110351644A (en) * | 2018-04-08 | 2019-10-18 | 苏州至听听力科技有限公司 | A kind of adaptive sound processing method and device |
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| CN112911056A (en) * | 2021-01-20 | 2021-06-04 | 努比亚技术有限公司 | Audio recording calibration method and device and computer readable storage medium |
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