CN103871418B - A kind of sound reinforcement system is uttered long and high-pitched sounds the detection method of frequency and device - Google Patents
A kind of sound reinforcement system is uttered long and high-pitched sounds the detection method of frequency and device Download PDFInfo
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Abstract
The present invention relates to a kind of sound reinforcement system to utter long and high-pitched sounds the detection method of frequency and device, the method includes: the voice signal collecting is converted to frequency-region signal；There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal；Described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency.A kind of sound reinforcement system that the present invention provides is uttered long and high-pitched sounds the detection method of frequency and device, by the two second compression process to frequency hunting zone of uttering long and high-pitched sounds, and sample decimation process time-domain signal being carried out according to frequency existence range of uttering long and high-pitched sounds, the Frequency point uttered long and high-pitched sounds can be automatically positioned out accurately, this method complexity is low, it is easy to real-time implementation on hardware, and then more cost effective can realize the chauvent's criterion of sound reinforcement system.
Description
Technical field
The present invention relates to digital signal processing technique field, particularly relate to a kind of sound reinforcement system and utter long and high-pitched sounds
The detection method of frequency and device.
Background technology
In sound reinforcement system, owing to microphone uses in same sound field with loudspeaker simultaneously, raise one's voice
The sound of device is received by the reflection of ambient interfaces after power amplifier amplifies by microphone,
Send through loudspeaker again, thus define an acoustics loop.When the transmission function of this loop exists
The gain of certain frequency is more than 1 and during integral multiple that phase place is 2 π, and sound reinforcement system will become shakiness
Determine i.e. to cause generation of uttering long and high-pitched sounds.Uttering long and high-pitched sounds is a kind of very common acoustic feedback phenomenon in sound reinforcement system, it
Limit the raising of system public address gain, when serious, even make system normally to work.Tradition
Chauvent's criterion method have: improve room acoustics environment, in sound reinforcement system series equalizer or
Person's frequency shifter etc., these methods not only to the damage of the tonequality of system is big and also the carrying of sound transmission gain
High less.In recent years, developing rapidly with Digital Signal Processing, occurs in that again
New chauvent's criterion method, such as adaptive echo cancellation method, spatial filtering method, wave trap method etc..
The wave trap method chauvent's criterion algorithm being wherein widely used has that audio distortions is little, sound transmission gain carries
The advantage such as tall and big.Key technology in wave trap method chauvent's criterion algorithm is quick to frequency of uttering long and high-pitched sounds
It is accurately positioned.In order to reach higher frequency resolution, detect frequency of uttering long and high-pitched sounds accurately, one
As the method that uses have Chirp-z mapping algorithm, MUSIC algorithm, wavelet analysis and reconstruct to calculate
Methods etc., although these algorithms are attained by higher resolution ratio, but it common disadvantage is that calculation
Method complexity is higher, thus causes realizing that required hardware cost is too high.
Content of the invention
(1) to solve the technical problem that
The technical problem to be solved is: traditional chauvent's criterion method is not only to system
Tonequality damage big and the raising of sound transmission gain is less.Some new uttering long and high-pitched sounds are also had to press down at present
Method processed, although be attained by higher resolution ratio, but its algorithm complex is higher, thus lead
Cause to realize that required hardware cost is too high.
(2) technical scheme
Utter long and high-pitched sounds the detection method of frequency for this purpose it is proposed, the present invention proposes a kind of sound reinforcement system, bag
Include following steps:
The voice signal collecting is converted to frequency-region signal；
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal；
Described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency.
Preferably, described the voice signal collecting is converted to frequency-region signal, specifically includes:
The voice signal receiving is carried out sub-frame processing；
Described voice signal after framing is carried out windowing process；
Described voice signal after windowing is carried out FFT and is converted to frequency-region signal.
Preferably, there is frequency of uttering long and high-pitched sounds in described search in the bandwidth range of described frequency-region signal
Sub-band, specifically includes:
Distribution character according to speech energy, system acoustics and frequency time-frequency characteristic of uttering long and high-pitched sounds exist
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal.
Preferably, the described distribution character according to speech energy, system acoustics and frequency of uttering long and high-pitched sounds
Rate time-frequency characteristic searches for the son frequency that there is frequency of uttering long and high-pitched sounds in the bandwidth range of described frequency-region signal
Band, specifically includes:
Reduce low frequency in the bandwidth range of described frequency-region signal according to the distribution character of speech energy
The frequency detection range of uttering long and high-pitched sounds of part；
Reduce HFS in the bandwidth range of described frequency-region signal according to system acoustics
Utter long and high-pitched sounds frequency detection range；
According to frequency time-frequency characteristic of uttering long and high-pitched sounds, to described frequency-region signal in the bandwidth range after reducing
Amplitude carry out peak value statistics, search out the sub-band of frequency of uttering long and high-pitched sounds.
Preferably, described described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency
Point, specifically includes:
In the utter long and high-pitched sounds sub-band scope of frequency of described existence, corresponding time-domain signal is sampled；
The frequency range of sub-band of frequency of uttering long and high-pitched sounds existence is compressed to original half；
Time-domain signal after sample decimation is transformed in the frequency domain of the sub-band after described compression；
The frequency domain of the sub-band after described compression detects frequency of uttering long and high-pitched sounds.
Preferably, the frequency domain of described sub-band after described compression detects frequency of uttering long and high-pitched sounds, tool
Body includes:
The peak point of search rate amplitude in the frequency domain of the sub-band after described compression；
Obtain and the corresponding frequency of described peak point.
Utter long and high-pitched sounds the detection device of frequency additionally, present invention also offers a kind of sound reinforcement system, comprising:
Modular converter, for being converted to frequency-region signal by the voice signal collecting；
Search module, utters long and high-pitched sounds frequency for searching for existence in the bandwidth range of described frequency-region signal
Sub-band；
Detection module, for described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency
Point.
Preferably, described modular converter includes:
Framing unit, for carrying out sub-frame processing by the voice signal receiving；
Windowing unit, for carrying out windowing process by the described voice signal after framing；
FFT converting unit, changes for the described voice signal after windowing is carried out FFT
To frequency-region signal.
Preferably, described search module includes:
First hunting zone compression unit, for according to the distribution character of speech energy reduces
The frequency detection range of uttering long and high-pitched sounds of low frequency part in the bandwidth range of frequency-region signal；
Second hunting zone compression unit, for reducing described frequency domain letter according to system acoustics
Number bandwidth range in the frequency detection range of uttering long and high-pitched sounds of HFS；
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, in the bandwidth range after reducing
Peak value statistics is carried out to the amplitude of described frequency-region signal, searches out the sub-band of frequency of uttering long and high-pitched sounds.
Preferably, described detection module includes:
Sampling unit, for uttering long and high-pitched sounds the sub-band scope of frequency to corresponding time domain in described existence
Signal is sampled；
Sub-band compression unit, for the frequency range compression of the sub-band of frequency of uttering long and high-pitched sounds existence
To original half；
DFT converting unit, after being transformed into described compression by the time-domain signal after sample decimation
Sub-band frequency domain in；
Detector unit, detects, in the frequency domain for the sub-band after described compression, frequency of uttering long and high-pitched sounds.
(3) beneficial effect
The invention provides a kind of sound reinforcement system to utter long and high-pitched sounds the detection method of frequency and device, by right
Utter long and high-pitched sounds two second compression process of frequency hunting zone, and according to frequency existence range of uttering long and high-pitched sounds to time domain
The sample decimation process that signal is carried out, greatly reduces on the premise of ensureing frequency resolution
Algorithm amount of calculation.And the present invention only needs, by Fourier transformation twice, to carry out frequency inspection at frequency domain
Survey can orient frequency of uttering long and high-pitched sounds accurately, and this greatly reduces the complexity of hardware, it is simple to
The economic chauvent's criterion realizing sound reinforcement system.
Brief description
By being more clearly understood from the features and advantages of the present invention with reference to accompanying drawing, accompanying drawing is to show
Meaning property and should not be construed as carrying out any restriction to the present invention, in the accompanying drawings:
Fig. 1 is that a kind of sound reinforcement system of the present invention is uttered long and high-pitched sounds the flow chart of detection method of frequency；
Fig. 2 is that a kind of sound reinforcement system of the present invention is uttered long and high-pitched sounds the principle schematic of detection method of frequency；
Fig. 3 be a kind of sound reinforcement system of the present invention utter long and high-pitched sounds frequency detection device module map.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Microphone in sound reinforcement system uses in same sound field with loudspeaker simultaneously, loudspeaker
Sound received by microphone by the reflection of ambient interfaces, through power amplifier amplify after,
Send through loudspeaker again, thus define an acoustics loop, be susceptible to phenomenon of uttering long and high-pitched sounds.
The embodiment of the present invention one proposes a kind of sound reinforcement system and utters long and high-pitched sounds the detection method of frequency, should
Method has the advantages that resolution ratio is high, amount of calculation is little, be easy on hardware economic realization, as
Shown in Fig. 1, the method comprises the following steps:
The voice signal collecting is converted to frequency-region signal by step 101；
Step 102, there is the son of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal
Frequency band；
Step 103, described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency.
Preferably, described the voice signal collecting is converted to frequency-region signal, specifically includes:
The voice signal receiving is carried out sub-frame processing by step 201；
Described voice signal after framing is carried out windowing process by step 202；
Described voice signal after windowing is carried out FFT and is converted to frequency-region signal by step 203.
Preferably, there is frequency of uttering long and high-pitched sounds in described search in the bandwidth range of described frequency-region signal
Sub-band, specifically includes:
Distribution character according to speech energy, system acoustics and frequency time-frequency characteristic of uttering long and high-pitched sounds exist
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal.
Preferably, the described distribution character according to speech energy, system acoustics and frequency of uttering long and high-pitched sounds
Rate time-frequency characteristic searches for the son frequency that there is frequency of uttering long and high-pitched sounds in the bandwidth range of described frequency-region signal
Band, specifically includes:
Step 301, reduces the bandwidth model of described frequency-region signal according to the distribution character of speech energy
Enclose the frequency detection range of uttering long and high-pitched sounds of interior low frequency part；
Step 302 is high reduce the bandwidth range of described frequency-region signal according to system acoustics in
Frequently the frequency detection range of uttering long and high-pitched sounds of part；
Step 303, according to frequency time-frequency characteristic of uttering long and high-pitched sounds, to institute in the bandwidth range after reducing
The amplitude stating frequency-region signal carries out peak value statistics, searches out the sub-band of frequency of uttering long and high-pitched sounds.
The cardinal principle of embodiment of the present invention, as in figure 2 it is shown, include two parts: deposit
Frequency of uttering long and high-pitched sounds sub-band search and described existence utter long and high-pitched sounds frequency sub-band in detection make a whistling sound
It is frequency.The sample rate in the present embodiment receiving microphone is fsThe time-domain signal of=44100
Carry out framing, windowing, it is contemplated that the problems such as algorithm amount of calculation and frequency resolution, the present embodiment
Choose L=1024 sampled point of every frame, or frame length 24ms.Smoothed in order to make between frame and frame
Crossing, keeping the continuity of signal, the present embodiment have employed the framing method of overlapping segmentation, previous
Frame between frame and a later frame moves and is chosen for the 50% of frame length, has 50% between i.e. adjacent two frames
Sampled point aliasing.
The present embodiment is chosen Hamming window and is carried out windowing process to the data after framing, utilizes afterwards
Time-domain signal is transformed to frequency domain by fast fourier transform algorithm.
Bandwidth reduction process is carried out to the frequency-region signal after conversion.M son of frequency domain is taken a message
Number, according to Fast Fourier Transform (FFT) character, it is only necessary to utter long and high-pitched sounds in front M/2+1 subband
Frequency is searched for.In view of the distribution character of speech energy, M/2+1 subband signal is carried out
Preliminary bandwidth reduction process, eliminates the subband signal of below 100Hz in the present embodiment.
Then according to the acoustic characteristic of sound reinforcement system, frequency of uttering long and high-pitched sounds is it is unlikely that at more than 20KHz
Subband signal in, therefore subband signal is carried out at further bandwidth reduction by the present embodiment
Reason, eliminates the subband signal of more than 20KHz, the most at last M subband signal boil down to
M/2-N subband signal.
According to the time-frequency characteristic of frequency of uttering long and high-pitched sounds, to frequency of uttering long and high-pitched sounds in M/2-N subband signal
Carry out time-frequency combination search.Frequency domain characteristic according to frequency of uttering long and high-pitched sounds: signal amplitude is beyond power amplifier
Linear amplification region produce before clipping phenomena, on frequency domain show as one do not have harmonic wave or
The little simple signal of harmonic wave.Therefore the present embodiment is to M/2-N subband signal advanced person's line frequency
The peak value searching of rate amplitude, if subband signal meets following condition simultaneously, just as may deposit
Candidate's subband at frequency of uttering long and high-pitched sounds.
Wherein: For son frequency
The amplitude of band signal
It according to the time domain specification of frequency of uttering long and high-pitched sounds is: the signal uttered long and high-pitched sounds shows as in time domain
The sinusoidal signal of one continuous-stable.Therefore the subband signal to candidate for the present embodiment goes out occurrence
Number carries out time-domain statistical analysis, and the number of times occurring continuously between frames when candidate's subband is full
During foot row condition, so that it may it is determined that the subband of frequency of uttering long and high-pitched sounds.
Wherein: QmFor the continuous occurrence number of subband setting, Dω(t-iP) it is the i-th frame detection
The candidate's sets of subbands going out, P is the time interval between frame and frame.
Preferably, described described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency
Point, specifically includes:
Step 401, utters long and high-pitched sounds the sub-band scope of frequency to corresponding time-domain signal in described existence
Sample；
Step 402, the frequency range of the sub-band of frequency of uttering long and high-pitched sounds existence is compressed to original one
Half；
Time-domain signal after sample decimation is transformed into the sub-band after described compression by step 403
Frequency domain in；
Step 404, detects, in the frequency domain of the sub-band after described compression, frequency of uttering long and high-pitched sounds.
Preferably, the frequency domain of described sub-band after described compression detects frequency of uttering long and high-pitched sounds, tool
Body includes:
Step 501, the peak value of search rate amplitude in the frequency domain of the sub-band after described compression
Point；
Step 502, obtains and the corresponding frequency of described peak point.
The present invention implements in row, the sub-band frequency model existing according to the frequency of uttering long and high-pitched sounds detecting
Enclose, carry out the sample decimation process of N times to time-domain signal.
Wherein: S is original time domain signal,For the time-domain signal after the extraction of N sampling.
Time-domain signal after sample decimation meets sampling thheorem in the frequency range of sub-band
Require.
According to the magnitude relation of subband two sideband, the frequency range of subband is carried out further
Compression process.For a frame signal of long M, the band width of subband is Df=fs/ M,
The centre frequency of H the subband that wherein there is frequency of uttering long and high-pitched sounds is fh=(m-1)×fs/H。
If the energy magnitude relationship of two subbands in left and right is PA(m+1)>PA(m-1), then utter long and high-pitched sounds frequency
Existence range is more than the centre frequency of subband, and search frequency band is compressible is [fh,fh+Df/2]；
Otherwise, if the energy magnitude relationship of two subbands in left and right is PA(m-1)>PA(m+1), then make a whistling sound
Being the centre frequency less than subband for the existence range of frequency, search frequency band is compressible is
[fh-Df/2,fh]。
According to discrete Fourier transform principle, the time-domain signal after sample decimation is transformed to pressure
The frequency domain in the range of sub-bands of frequencies after contracting.
Wherein: ωk=2πfk, A (ωk, it t) is ωkThe signal amplitude of frequency, fkCan be according to calculation
Freely choosing in method resolution requirement frequency band upon compression, the present embodiment have chosen 1Hz's
Frequency resolution.
By the frequency domain of sub-band upon compression is searched for the A (ω of maximumk, t), corresponding to it
Frequency point it is determined that frequency of uttering long and high-pitched sounds.
The embodiment of the present invention two also proposed a kind of sound reinforcement system and utters long and high-pitched sounds the detection device of frequency,
As it is shown on figure 3, include modular converter the 1st, search module 2 and detection module 3:
Modular converter 1, for being converted to frequency-region signal by the voice signal collecting；
Search module 2, utters long and high-pitched sounds frequently for searching for existence in the bandwidth range of described frequency-region signal
The sub-band of point；
Detection module 3, for described existence utter long and high-pitched sounds frequency sub-band in the range of detect and utter long and high-pitched sounds
Frequency.
Preferably, described modular converter 1 includes:
Framing unit, for carrying out sub-frame processing by the voice signal receiving；
Windowing unit, for carrying out windowing process by the described voice signal after framing；
FFT converting unit, changes for the described voice signal after windowing is carried out FFT
To frequency-region signal.
Preferably, described search module 2 includes:
First hunting zone compression unit, for according to the distribution character of speech energy reduces
The frequency detection range of uttering long and high-pitched sounds of low frequency part in the bandwidth range of frequency-region signal；
Second hunting zone compression unit, for reducing described frequency domain letter according to system acoustics
Number bandwidth range in the frequency detection range of uttering long and high-pitched sounds of HFS；
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, in the bandwidth range after reducing
Peak value statistics is carried out to the amplitude of described frequency-region signal, searches out the sub-band of frequency of uttering long and high-pitched sounds.
Preferably, described detection module 3 includes:
Sampling unit, for uttering long and high-pitched sounds the sub-band scope of frequency to corresponding time domain in described existence
Signal is sampled；
Sub-band compression unit, for the frequency range compression of the sub-band of frequency of uttering long and high-pitched sounds existence
To original half；
DFT converting unit, after being transformed into described compression by the time-domain signal after sample decimation
Sub-band frequency domain in；
Detector unit, detects, in the frequency domain for the sub-band after described compression, frequency of uttering long and high-pitched sounds.
The invention provides a kind of sound reinforcement system to utter long and high-pitched sounds the detection method of frequency and device, by right
Utter long and high-pitched sounds two second compression process of frequency hunting zone, and according to frequency existence range of uttering long and high-pitched sounds to time domain
The sample decimation process that signal is carried out, greatly reduces on the premise of ensureing frequency resolution
Algorithm amount of calculation.And the present invention only needs, by Fourier transformation twice, to carry out frequency inspection at frequency domain
Survey can orient frequency of uttering long and high-pitched sounds accurately, and this greatly reduces the complexity of hardware, it is simple to
The economic chauvent's criterion realizing sound reinforcement system.
Through the above description of the embodiments, those skilled in the art it can be understood that
Can be realized by hardware to the present invention, it is also possible to add the general hardware platform of necessity by software
Mode realize.Based on such understanding, technical scheme can be with software product
Form embody, this software product can be stored in a non-volatile memory medium (can
To be CD-ROM, USB flash disk, portable hard drive etc.) in, including some instructions are with so that one
Computer equipment (can be personal computer, server, or the network equipment etc.) performs basis
Invent the method described in each embodiment.
It will be appreciated by those skilled in the art that the schematic diagram that accompanying drawing is a preferred embodiment, attached
Module in figure or flow process are not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be according to reality
Execute example description to carry out being distributed in the device of embodiment, it is also possible to carry out respective change and be positioned at difference
In one or more devices of the present embodiment.The module of above-described embodiment can merge into one
Module, it is also possible to be further split into multiple submodule.
The several specific embodiments being only the present invention disclosed above, but, the present invention not office
Being limited to this, the changes that any person skilled in the art can think of all should fall into the protection of the present invention
Scope.
Claims (8)
1. a sound reinforcement system is uttered long and high-pitched sounds the detection method of frequency, it is characterised in that include following
Step:
The voice signal collecting is converted to frequency-region signal；
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal；
Described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency；
Described described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency, specifically wrap
Include:
In the utter long and high-pitched sounds sub-band scope of frequency of described existence, corresponding time-domain signal is sampled；
The frequency range of sub-band of frequency of uttering long and high-pitched sounds existence is compressed to original half；
Time-domain signal after sample decimation is transformed in the frequency domain of the sub-band after described compression；
The frequency domain of the sub-band after described compression detects frequency of uttering long and high-pitched sounds.
2. method according to claim 1, it is characterised in that described will collect
Voice signal is converted to frequency-region signal, specifically includes:
The voice signal receiving is carried out sub-frame processing；
Described voice signal after framing is carried out windowing process；
Described voice signal after windowing is carried out FFT and is converted to frequency-region signal.
3. method according to claim 1, it is characterised in that described at described frequency domain
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of signal, specifically includes:
Distribution character according to speech energy, system acoustics and frequency time-frequency characteristic of uttering long and high-pitched sounds exist
There is the sub-band of frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal.
4. method according to claim 3, it is characterised in that described according to voice energy
Distribution character, the system acoustics of amount and frequency time-frequency characteristic of uttering long and high-pitched sounds are at described frequency-region signal
There is the sub-band of frequency of uttering long and high-pitched sounds in search in bandwidth range, specifically includes:
Reduce low frequency in the bandwidth range of described frequency-region signal according to the distribution character of speech energy
The frequency detection range of uttering long and high-pitched sounds of part；
Reduce HFS in the bandwidth range of described frequency-region signal according to system acoustics
Utter long and high-pitched sounds frequency detection range；
According to frequency time-frequency characteristic of uttering long and high-pitched sounds, to described frequency-region signal in the bandwidth range after reducing
Amplitude carry out peak value statistics, search out the sub-band of frequency of uttering long and high-pitched sounds.
5. method according to claim 1, it is characterised in that described in described compression
After sub-band frequency domain in detection utter long and high-pitched sounds frequency, specifically include:
The peak point of search rate amplitude in the frequency domain of the sub-band after described compression；
Obtain and the corresponding frequency of described peak point.
6. a sound reinforcement system is uttered long and high-pitched sounds the detection device of frequency, it is characterised in that include:
Modular converter, for being converted to frequency-region signal by the voice signal collecting；
Search module, utters long and high-pitched sounds frequency for searching for existence in the bandwidth range of described frequency-region signal
Sub-band；
Detection module, for described existence utter long and high-pitched sounds frequency sub-band in the range of detection utter long and high-pitched sounds frequency
Point；
Described detection module includes:
Sampling unit, for uttering long and high-pitched sounds the sub-band scope of frequency to corresponding time domain in described existence
Signal is sampled；
Sub-band compression unit, for the frequency range compression of the sub-band of frequency of uttering long and high-pitched sounds existence
To original half；
DFT converting unit, after being transformed into described compression by the time-domain signal after sample decimation
Sub-band frequency domain in；
Detector unit, detects, in the frequency domain for the sub-band after described compression, frequency of uttering long and high-pitched sounds.
7. device according to claim 6, it is characterised in that described modular converter bag
Include:
Framing unit, for carrying out sub-frame processing by the voice signal receiving；
Windowing unit, for carrying out windowing process by the described voice signal after framing；
FFT converting unit, changes for the described voice signal after windowing is carried out FFT
To frequency-region signal.
8. system according to claim 6, it is characterised in that described search module bag
Include:
First hunting zone compression unit, for according to the distribution character of speech energy reduces
The frequency detection range of uttering long and high-pitched sounds of low frequency part in the bandwidth range of frequency-region signal；
Second hunting zone compression unit, for reducing described frequency domain letter according to system acoustics
Number bandwidth range in the frequency detection range of uttering long and high-pitched sounds of HFS；
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, in the bandwidth range after reducing
Peak value statistics is carried out to the amplitude of described frequency-region signal, searches out the sub-band of frequency of uttering long and high-pitched sounds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410080058.1A CN103871418B (en) | 2014-03-06 | 2014-03-06 | A kind of sound reinforcement system is uttered long and high-pitched sounds the detection method of frequency and device |
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| CN201410080058.1A CN103871418B (en) | 2014-03-06 | 2014-03-06 | A kind of sound reinforcement system is uttered long and high-pitched sounds the detection method of frequency and device |
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| CN103871418A CN103871418A (en) | 2014-06-18 |
| CN103871418B true CN103871418B (en) | 2016-10-05 |
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| CN105812993B (en) * | 2014-12-29 | 2019-02-15 | 联芯科技有限公司 | It utters long and high-pitched sounds detection and suppressing method and its device |
| CN104918182B (en) * | 2015-04-08 | 2018-03-09 | 长江大学 | Utter long and high-pitched sounds detection and suppression system |
| CN106486133B (en) * | 2015-08-27 | 2019-11-15 | 成都鼎桥通信技术有限公司 | One kind is uttered long and high-pitched sounds scene recognition method and equipment |
| CN106488052A (en) * | 2015-08-27 | 2017-03-08 | 成都鼎桥通信技术有限公司 | One kind is uttered long and high-pitched sounds scene recognition method and equipment |
| CN105516876A (en) * | 2015-12-09 | 2016-04-20 | 天津大学 | Spectrum entropy based howling detection method |
| CN105895115A (en) * | 2016-04-01 | 2016-08-24 | 北京小米移动软件有限公司 | Squeal determining method and squeal determining device |
| CN107919134B (en) * | 2016-10-10 | 2021-04-02 | 杭州海康威视数字技术股份有限公司 | Howling detection method and device and howling suppression method and device |
| CN106533869B (en) * | 2016-11-08 | 2020-10-20 | 北京飞利信电子技术有限公司 | Data forwarding method and device and electronic equipment |
| CN106558316A (en) * | 2016-11-09 | 2017-04-05 | 天津大学 | It is a kind of based on it is long when signal special frequency band rate of change detection method of uttering long and high-pitched sounds |
| CN109102819A (en) * | 2017-06-20 | 2018-12-28 | 中移（杭州）信息技术有限公司 | One kind is uttered long and high-pitched sounds detection method and device |
| CN108449504B (en) * | 2018-03-12 | 2019-10-15 | Oppo广东移动通信有限公司 | Voice communication data detection method, device, storage medium and mobile terminal |
| CN109637552A (en) * | 2018-11-29 | 2019-04-16 | 河北远东通信系统工程有限公司 | A kind of method of speech processing for inhibiting audio frequency apparatus to utter long and high-pitched sounds |
| CN109741760B (en) * | 2018-12-18 | 2020-12-22 | 科大讯飞股份有限公司 | Noise estimation method and system |
| WO2020150864A1 (en) * | 2019-01-21 | 2020-07-30 | 阿里巴巴集团控股有限公司 | Audio signal detection method and apparatus, and audio and video conference system |
| CN109905811B (en) * | 2019-01-24 | 2021-02-26 | 珠海慧联科技有限公司 | Economical acoustic feedback control method and device |
| CN110442334B (en) * | 2019-07-15 | 2023-04-28 | 北京飞利信电子技术有限公司 | Multi-user collaborative graph configuration method, electronic equipment and server |
| CN111988707B (en) * | 2020-08-13 | 2022-02-08 | 北京达佳互联信息技术有限公司 | Howling detection method, howling detection device and storage medium |
| CN114387985A (en) * | 2021-09-30 | 2022-04-22 | 长沙幻音电子科技有限公司 | Howling suppression method and system for stringed musical instrument and stringed musical instrument |
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