CN109147811A - A kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat - Google Patents
A kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat Download PDFInfo
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- CN109147811A CN109147811A CN201810877424.4A CN201810877424A CN109147811A CN 109147811 A CN109147811 A CN 109147811A CN 201810877424 A CN201810877424 A CN 201810877424A CN 109147811 A CN109147811 A CN 109147811A
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- 238000003379 elimination reaction Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000005236 sound signal Effects 0.000 claims description 14
- 238000005457 optimization Methods 0.000 claims description 13
- 230000003044 adaptive effect Effects 0.000 claims description 5
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- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009432 framing Methods 0.000 description 2
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/24—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being the cepstrum
-
- 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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Human Computer Interaction (AREA)
- Audiology, Speech & Language Pathology (AREA)
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Abstract
It is disclosed by the invention to belong to audio collection and processing technology field, specially a kind of audio system that reverberation elimination and chauvent's criterion are realized using single wheat, including microphone, the output end of the microphone is electrically connected the input terminal of voice acquisition module, the output end of the voice acquisition module is electrically connected the input terminal of automatic growth control module, the output end of the automatic growth control module is electrically connected the input terminal of DSP operation module, the output end of the DSP operation module is electrically connected the input terminal of power amplifier module, the output end of the power amplifier module is electrically connected the input terminal of loudspeaker, use the chauvent's criterion and reverberation elimination algorithm after a kind of improvement, and combine software and hardware algorithm, the algorithm of use is based on filtered-X, and merge improved inversion method removal reverberation, it can make sound after processing , go to amplify with higher sound quality reduction degree, to achieve the effect that required, realize that high tone quality public address and can preventing is uttered long and high-pitched sounds and reverberation.
Description
Technical field
It is specially a kind of to realize that reverberation is eliminated and utters long and high-pitched sounds using single wheat the present invention relates to audio collection and processing technology field
The audio system of inhibition.
Background technique
It utters long and high-pitched sounds and refers to electroacoustic phenomenon generally existing in a kind of sound reinforcement system with reverberation, often brought to whole system huge
Interference, cause system performance to decline, under serious extreme case, in some instances it may even be possible to cause system unusable, thus extremely
Influence the usage experience of user.So a kind of stabilization closed loop algorithm that can timely inhibit system to utter long and high-pitched sounds and remove reverberation is
The ring that can not be lacked in this system.In prevailing system everybody generally the method used such as: shift frequency method (FS, frequency
) and phase-shifting method (PM, phase modulation), gain reduction method (NHS, notch-filter-based shifting
Cancellation), these classical chauvent's criterion algorithms can all bring inevitable sound quality damage and tone color to change, thus
Very high reduction degree and amplification effect is not achieved.For this purpose, it is proposed that a kind of realize reverberation elimination and chauvent's criterion using single wheat
Audio system.
Summary of the invention
The purpose of the present invention is to provide a kind of audio systems that reverberation elimination and chauvent's criterion are realized using single wheat, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme: a kind of realize that reverberation is eliminated and utters long and high-pitched sounds using single wheat
The audio system of inhibition, including microphone, the output end of the microphone is electrically connected the input terminal of voice acquisition module, described
The output end of voice acquisition module is electrically connected the input terminal of automatic growth control module, the automatic growth control module it is defeated
Outlet is electrically connected the input terminal of DSP operation module, and the output end of the DSP operation module is electrically connected the input of power amplifier module
End, the output end of the power amplifier module are electrically connected the input terminal of loudspeaker；
The acquisition to audio signal is realized by the microphone and the voice acquisition module, and the audio of acquisition is believed
Number it is transmitted to the automatic growth control module, automatic gain control is carried out to audio signal by the automatic growth control module
System realizes noise by the algorithm of the optimization in DSP operation module then by audio signal transmission to the DSP operation module
Operation is eliminated in detection, chauvent's criterion and reverberation, after being then fed into the power amplifier module, is amplified through the loudspeaker and is exported.
Preferably, the loudspeaker hinder loudspeaker using 8 ohm surely.
Preferably, the DSP operation module is built-in with the chauvent's criterion algorithm based on filtered-X optimization and is based on
The Reverberation Rejection algorithm that inversion method is realized, and DSP operation module further comprises logic unit and periphery indispensable in audio processing
Auxiliary circuit.
Preferably, the chauvent's criterion algorithm based on filtered-X optimization are as follows: after using FIR filter, audio
DSP module is equivalent comes for processing, then FIR filter output signal y (n) are as follows:Wherein, w1
(n) feedback element for acting on system is real-time change, and is updated by adaptive algorithm, and sef-adapting filter is by more
New coefficient, to make some scheduled performance indicator reach best.
Preferably, it is described based on inversion method realize Reverberation Rejection algorithm are as follows: using low-pass filter it is low when window filtering
Corresponding reverberant part is filtered out, the sound-source signal after reverberation is weakened then is obtained by contrary operation again.
Compared with prior art, the beneficial effects of the present invention are: a kind of of invention proposition realizes that reverberation disappears using single wheat
It removes and the audio system of chauvent's criterion, using the chauvent's criterion and reverberation elimination algorithm after a kind of improvement, and software and hardware is combined to calculate
The algorithm of method, use is based on filtered-X, and merges improved inversion method removal reverberation, and sound can be made by handling
Later, go to amplify with higher sound quality reduction degree, thus achieve the effect that it is required, realize high tone quality public address and can prevent from uttering long and high-pitched sounds and
Reverberation.
Detailed description of the invention
Fig. 1 is invention's principle block diagram；
Fig. 2 is that 8 ohm of the present invention hinders loudspeaker dynamic response map surely；
Fig. 3 is audio feedback circuit flow chart of the present invention；
Fig. 4 is that the present invention is based on the chauvent's criterion algorithmic system figures that filtered-X optimizes；
Fig. 5 is that the present invention is based on the Reverberation Rejection algorithm flow charts that inversion method is realized.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-5 is please referred to, the present invention provides a kind of technical solution: a kind of to realize reverberation elimination and chauvent's criterion using single wheat
Audio system, including microphone, the output end of the microphone is electrically connected the input terminal of voice acquisition module, the voice
The output end of acquisition module is electrically connected the input terminal of automatic growth control module, the output end of the automatic growth control module
It is electrically connected the input terminal of DSP operation module, the output end of the DSP operation module is electrically connected the input terminal of power amplifier module,
The output end of the power amplifier module is electrically connected the input terminal of loudspeaker；
The acquisition to audio signal is realized by the microphone and the voice acquisition module, and the audio of acquisition is believed
Number it is transmitted to the automatic growth control module, automatic gain control is carried out to audio signal by the automatic growth control module
System realizes noise by the algorithm of the optimization in DSP operation module then by audio signal transmission to the DSP operation module
Operation is eliminated in detection, chauvent's criterion and reverberation, after being then fed into the power amplifier module, is amplified through the loudspeaker and is exported.
Wherein, the loudspeaker hinder loudspeaker using 8 ohm surely, and the DSP operation module is built-in with to be optimized based on filtered-X
Chauvent's criterion algorithm and the Reverberation Rejection algorithm realized based on inversion method, and further comprise must in audio processing for DSP operation module
Standby logic unit and peripheral auxiliary circuits, the chauvent's criterion algorithm based on filtered-X optimization are as follows: use FIR filter
Afterwards, it comes audio processing DSP module is equivalent, then FIR filter output signal y (n) are as follows:
Wherein, w1(n) feedback element for acting on system is real-time change, and is updated by adaptive algorithm, sef-adapting filter
By updating coefficient, reach some scheduled performance indicator most preferably, the Reverberation Rejection algorithm realized based on inversion method
Are as follows: using low-pass filter it is low when window filtering filter out corresponding reverberant part, then again by contrary operation, obtain reverberation by
Sound-source signal after to decrease
The system is applied in classroom, microphone is hung in front of dais, the left and right inside roof 80, microphone
Maximum radius is 8 meters, and by a pair of of hanging loudspeaker at the one third of classroom rear portion, loudspeaker hinder loudspeaker using 8 ohm surely, appropriate
The dynamic response sensitivity weakened to low frequency and high frequency section, dynamic response map is refering to Fig. 2.
Acquisition by microphone to audio signal, and by the audio signal transmission of acquisition to automatic growth control module,
Automatic growth control is carried out to audio signal by automatic growth control module, then by audio signal transmission to DSP operation mould
Block is realized that operation is eliminated in noise measuring, chauvent's criterion and reverberation by the algorithm of the optimization in DSP operation module, is then fed into
After power amplifier module, through loudspeaker amplify export, DSP operation module be built-in with based on filtered-X optimization chauvent's criterion algorithm with
And the Reverberation Rejection algorithm realized based on inversion method.
Above two algorithm is successively unfolded as follows:
Chauvent's criterion algorithm based on filtered-X optimization:
Feedback loop flow chart is illustrated refering to Fig. 3, Fig. 2, in which: x (n) is system original input signal；D (n) is anti-
Feedback signal；U (n) is the input signal of forward path；F (z) is loudspeaker to the acoustic feedback path between microphone；G (z) is
Audio processing DSP module；Y (n) is system output signal.
After FIR filter, G (Z) part spread equivalently (refering to Fig. 4), wherein filter output signal y (n)
Are as follows:Wherein, it is real-time change, and is updated by adaptive algorithm, sef-adapting filter is logical
Update coefficient is crossed, reach some scheduled performance indicator most preferably, it can be seen that the performance indicator master of entire filter
It is the design of adaptive algorithm, w1(n) feedback element of system is acted on, the convergence rate of the more fast then system of update is just
It is higher, optimize w1(n) maximum return can be brought to whole system, compared to some w for setting about realizing from Minimum Mean Square Error1(n)
Function, herein for application scenarios be 70 to 200 square meter classroom the characteristics of and use space in object visit and metope feature
Etc. general general character, depth optimization algorithm, the w after many experiments obtain optimization1(n) parameter expression, in convergence and operation
It is characterized in the performance of quality and system, hence it is evident that better than present algorithm.
The Reverberation Rejection algorithm realized based on inversion method:
Reverberation is room shock response because it originates from sound by reaching receiving point after the one or many reflections of surrounding objects
The convolution made a sound with sound source, so influence of the reverberation sound to original signal will be mitigated or eliminated in dereverberation technology from receiving end,
Process flow is refering to Fig. 5.
In Fig. 5: x (n) is reverb signal, and s (n) is the cleaning voice signal removed after reverberation, and y (n) is at reverberation
Voice signal after reason, the i.e. estimation of s (n), the Reverberation Rejection algorithm that should be realized based on inversion method are directed to rushing for voice and room
The segregative feature situation of response is hit to be handled, using low-pass filter it is low when window filtering filter out corresponding reverberation portion
Point, the sound-source signal after reverberation is weakened then is obtained by contrary operation again.
The key point of the part be framing and optimize cepstrum technical method, make it possible in embedded systems compared with
Quickly to run, to reduce because technology bring total system postpones.
Framing: the selection of frame length will be directly related in the operand and real-time of system, and frame length is too small to will lead to s (n) not
It is enough precisely, it is too long and computational complexity can be made too high and system is made to generate larger delay, for concrete application scene and reality
Situation and the operational capability for combining the used DSP of embedded system, frame length is locked at 512 points by us, through the experimental demonstration point
Number can make the income of system reach peak.
Cepstrum operation: the requirement of real-time of computing capability and system for embedded system, being used in inversion method
Formula simplified and optimized operation, the complexity of operation can be made to be greatly lowered, to keep the timeliness of system big
It is big to improve.
Ca(t)=| F-1{log[sn(f)]}|
For in formula logarithm part and the big problem of other floating type operands, on many material time nodes, lead to
It crosses and is accelerated using cp coprocessor, or even trading space for time in such a way that substitution operation is tabled look-up in preferential domain use
Carry out optimal speed.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat, including microphone, it is characterised in that: described
The output end of microphone is electrically connected the input terminal of voice acquisition module, and the output end of the voice acquisition module is electrically connected certainly
The input terminal of dynamic gain control module, the output end of the automatic growth control module are electrically connected the input of DSP operation module
End, the output end of the DSP operation module are electrically connected the input terminal of power amplifier module, and the output end of the power amplifier module electrically connects
Connect the input terminal of loudspeaker；
The acquisition to audio signal is realized by the microphone and the voice acquisition module, and the audio signal of acquisition is passed
The automatic growth control module is transported to, automatic growth control is carried out to audio signal by the automatic growth control module,
Then by audio signal transmission to the DSP operation module, noise inspection is realized by the algorithm of the optimization in DSP operation module
Operation is eliminated in survey, chauvent's criterion and reverberation, after being then fed into the power amplifier module, is amplified through the loudspeaker and is exported.
2. a kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat according to claim 1, feature
Be: the loudspeaker hinder loudspeaker using 8 ohm surely.
3. a kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat according to claim 1, feature
Be: the DSP operation module is built-in with the chauvent's criterion algorithm based on filtered-X optimization and is realized based on inversion method
Reverberation Rejection algorithm, and DSP operation module further comprises logic unit and peripheral auxiliary circuits indispensable in audio processing.
4. a kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat according to claim 3, feature
It is: the chauvent's criterion algorithm based on filtered-X optimization are as follows: after using FIR filter, audio processing DSP module
It is equivalent to come, then FIR filter output signal y (n) are as follows:Wherein, w1(n) system is acted on
Feedback element, be real-time change, and by adaptive algorithm update, sef-adapting filter by update coefficient, to make certain
A scheduled performance indicator reaches best.
5. a kind of audio system for realizing reverberation elimination and chauvent's criterion using single wheat according to claim 3, feature
Be: it is described based on inversion method realize Reverberation Rejection algorithm are as follows: using low-pass filter it is low when window filtering filter out accordingly
Then reverberant part obtains the sound-source signal after reverberation is weakened by contrary operation again.
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| CN111586527A (en) * | 2020-04-28 | 2020-08-25 | 重庆西原楼宇自动化工程有限公司 | Intelligent voice processing system |
| CN112036024A (en) * | 2020-08-26 | 2020-12-04 | 孙大钊 | Building acoustic processing method and device, electronic equipment and storage medium |
| CN112309364A (en) * | 2020-11-04 | 2021-02-02 | 广州市立锐升电子有限公司 | Method, system and chip for realizing DSP multichannel squeal reduction processing |
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