CN103871418A - Method and device for detecting howling frequency point of acoustic amplification system - Google Patents
Method and device for detecting howling frequency point of acoustic amplification system Download PDFInfo
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- CN103871418A CN103871418A CN201410080058.1A CN201410080058A CN103871418A CN 103871418 A CN103871418 A CN 103871418A CN 201410080058 A CN201410080058 A CN 201410080058A CN 103871418 A CN103871418 A CN 103871418A
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Abstract
The invention relates to a method and a device for detecting the howling frequency point of an acoustic amplification system. The method comprises the following steps of converting collected voice signals to frequency domain signals; searching for sub-bands where the howling frequency point exists within the bandwidth range of the frequency domain signals; detecting the howling frequency point within the range of the sub-bands where the howling frequency point exists. According to the method and the device for detecting the howling frequency point of the acoustic amplification system provided by the invention, the frequency point at which the howling occurs can be precisely and automatically positioned by compressing the searching range of the howling frequency point twice and by sampling and extracting time domain signals according to the howling frequency point existing range; the method is low in complexity and convenient to realize in real time on hardware, so that the howling inhibition of the acoustic amplification system can be further realized more economically.
Description
Technical field
The present invention relates to digital signal processing technique field, relate in particular to a kind of sound reinforcement system utter long and high-pitched sounds detection method and the device of frequency.
Background technology
In sound reinforcement system, the use simultaneously in same sound field due to microphone and loudspeaker, the sound of loudspeaker passes through the reflection quilt microphone at interface around and receives after power amplifier amplifies, and sends again, thereby formed an acoustics loop through loudspeaker.When the transport function of this loop is greater than 1 and phase place while being the integral multiple of 2 π in the gain of certain frequency, sound reinforcement system will become the unstable generation of uttering long and high-pitched sounds that causes.Uttering long and high-pitched sounds is a kind of very common acoustic feedback phenomenon in sound reinforcement system, and it has limited the raising that system public address gains, and when serious, even makes system normally work.Traditional inhibition method of uttering long and high-pitched sounds has: improve room acoustics environment, in sound reinforcement system series equalizer or frequency shifter etc., these methods not only raising large to the tonequality damage of system but also transaudient gain are less.In recent years, along with developing rapidly of Digital Signal Processing, there is again the inhibition method of uttering long and high-pitched sounds that some are new, as adaptive echo cancellation method, spatial filtering method, wave trap method etc.The wave trap method being wherein the widely used Restrainable algorithms of uttering long and high-pitched sounds has little, the transaudient gain of audio distortions and improves the advantages such as large.The gordian technique that wave trap method is uttered long and high-pitched sounds in Restrainable algorithms is the quick and precisely location to the frequency of uttering long and high-pitched sounds.In order to reach higher frequency resolution, detect accurately the frequency of uttering long and high-pitched sounds, the general method adopting has Chirp-z mapping algorithm, MUSIC algorithm, wavelet analysis and restructing algorithm etc., although these algorithms can reach higher resolution, but its common shortcoming is exactly that algorithm complex is higher, thereby it is too high to cause realizing required hardware cost.
Summary of the invention
(1) technical matters that will solve
Technical matters to be solved by this invention is: traditional inhibition method of uttering long and high-pitched sounds is not only less to the tonequality damage of system raising large but also transaudient gain.Also have at present some new inhibition methods of uttering long and high-pitched sounds, although can reach higher resolution, its algorithm complex is higher, thereby it is too high to cause realizing required hardware cost.
(2) technical scheme
For this purpose, the present invention proposes the utter long and high-pitched sounds detection method of frequency of a kind of sound reinforcement system, comprise the following steps:
The voice signal collecting is converted to frequency-region signal;
There is the sub-band of the frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal;
Within the scope of uttering long and high-pitched sounds the sub-band of frequency, described existence detects the frequency of uttering long and high-pitched sounds.
Preferably, described the voice signal collecting is converted to frequency-region signal, specifically comprises:
Divide frame processing by the voice signal receiving;
Described voice signal after point frame is carried out to windowing process;
Described voice signal after windowing is carried out to FFT and be converted to frequency-region signal.
Preferably, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal, specifically comprises:
In the bandwidth range of described frequency-region signal, search for according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds the sub-band that has the frequency of uttering long and high-pitched sounds.
Preferably, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds, specifically comprises:
Dwindle the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
Dwindle the frequency detecting scope of uttering long and high-pitched sounds of HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
According to the frequency time-frequency characteristic of uttering long and high-pitched sounds, in the bandwidth range after dwindling, the amplitude of described frequency-region signal is carried out to peak value statistics, search out the sub-band of the frequency of uttering long and high-pitched sounds.
Preferably, describedly within the scope of the sub-band of frequency is uttered long and high-pitched sounds in described existence, detect the frequency of uttering long and high-pitched sounds, specifically comprise:
In the utter long and high-pitched sounds sub-band scope of frequency of described existence, corresponding time-domain signal is sampled;
The utter long and high-pitched sounds frequency range of sub-band of frequency of 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;
In the frequency domain of the sub-band after described compression, detect the frequency of uttering long and high-pitched sounds.
Preferably, in the frequency domain of described sub-band after described compression, detect the frequency of uttering long and high-pitched sounds, specifically comprise:
The peak point of search rate amplitude in the frequency domain of the sub-band after described compression;
Obtain the frequency corresponding with described peak point.
In addition, the pick-up unit that the present invention also provides a kind of sound reinforcement system to utter long and high-pitched sounds frequency, comprising:
Modular converter, for being converted to frequency-region signal by the voice signal collecting;
Search module, for searching for the sub-band that has the frequency of uttering long and high-pitched sounds in the bandwidth range of described frequency-region signal;
Detection module, for detecting the frequency of uttering long and high-pitched sounds within the scope of the sub-band of the frequency of uttering long and high-pitched sounds in described existence.
Preferably, described modular converter comprises:
Divide frame unit, for dividing frame processing by the voice signal receiving;
Add window unit, for the described voice signal after point frame is carried out to windowing process;
FFT converting unit, is converted to frequency-region signal for the described voice signal after windowing is carried out to FFT.
Preferably, described search module comprises:
The first hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
The second hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, carries out peak value statistics to the amplitude of described frequency-region signal in the bandwidth range after dwindling, and searches out the sub-band of the frequency of uttering long and high-pitched sounds.
Preferably, described detection module comprises:
Sampling unit, samples to corresponding time-domain signal for the sub-band scope of the frequency of uttering long and high-pitched sounds in described existence;
Sub-band compression unit, is compressed to original half for the frequency range of the sub-band of frequency that existence is uttered long and high-pitched sounds;
DFT converting unit, for being transformed into the time-domain signal after sample decimation the frequency domain of the sub-band after described compression;
Detecting unit, detects for the frequency domain of the sub-band after described compression the frequency of uttering long and high-pitched sounds.
(3) beneficial effect
The invention provides a kind of sound reinforcement system utter long and high-pitched sounds detection method and the device of frequency, by twice compression processing to the frequency hunting zone of uttering long and high-pitched sounds, and the sample decimation processing of time-domain signal being carried out according to the frequency existence range of uttering long and high-pitched sounds, under the prerequisite that ensures frequency resolution, reduce greatly algorithm calculated amount.And the present invention only needs by twice Fourier transform, carry out frequency detection at frequency domain and just can orient accurately the frequency of uttering long and high-pitched sounds, this has reduced the complexity of hardware greatly, is convenient to the economic inhibition of uttering long and high-pitched sounds that realizes sound reinforcement system.
Brief description of the drawings
Can more clearly understand the features and advantages of the present invention by reference to accompanying drawing, accompanying drawing is schematically to should not be construed as the present invention is carried out to any restriction, in the accompanying drawings:
Fig. 1 is the utter long and high-pitched sounds process flow diagram of detection method of frequency of a kind of sound reinforcement system of the present invention;
Fig. 2 is the utter long and high-pitched sounds principle schematic of detection method of frequency of a kind of sound reinforcement system of the present invention;
Fig. 3 is the utter long and high-pitched sounds module map of pick-up unit of frequency of a kind of sound reinforcement system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Microphone in sound reinforcement system and loudspeaker use in same sound field simultaneously, the sound of loudspeaker, by the reflection quilt microphone reception at interface around, after power amplifier amplifies, is sent through loudspeaker again, thereby form an acoustics loop, the phenomenon of easily uttering long and high-pitched sounds.
The embodiment of the present invention one has proposed the utter long and high-pitched sounds detection method of frequency of a kind of sound reinforcement system, and the method has that resolution is high, calculated amount is little, be convenient to the economic feature realizing on hardware, and as shown in Figure 1, the method comprises the following steps:
Preferably, described the voice signal collecting is converted to frequency-region signal, specifically comprises:
Step 201, divides frame processing by the voice signal receiving;
Step 202, carries out windowing process by the described voice signal after point frame;
Step 203, carries out FFT by the described voice signal after windowing and is converted to frequency-region signal.
Preferably, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal, specifically comprises:
In the bandwidth range of described frequency-region signal, search for according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds the sub-band that has the frequency of uttering long and high-pitched sounds.
Preferably, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds, specifically comprises:
Step 301, dwindles the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
Step 302, the frequency detecting scope of uttering long and high-pitched sounds of dwindling HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
Step 303, according to the frequency time-frequency characteristic of uttering long and high-pitched sounds, carries out peak value statistics to the amplitude of described frequency-region signal in the bandwidth range after dwindling, and searches out the sub-band of the frequency of uttering long and high-pitched sounds.
The cardinal principle of embodiment of the present invention, as shown in Figure 2, comprises two parts: have the sub-band search of the frequency of uttering long and high-pitched sounds and detect the frequency of uttering long and high-pitched sounds in the sub-band of frequency is uttered long and high-pitched sounds in described existence.The sampling rate in the present embodiment, microphone being received is f
s=44100 time-domain signal divides frame, windowing, considers the problems such as algorithm calculated amount and frequency resolution, and the present embodiment is chosen every frame L=1024 sampled point, or frame length 24ms.In order to make to seamlessly transit between frame and frame, the continuity of holding signal, the present embodiment has adopted point frame method of overlapping segmentation, and the frame between former frame and a rear frame moves and is chosen for 50% of frame length, between adjacent two frames, has 50% sampled point aliasing.
The present embodiment is chosen Hamming window the data after point frame is carried out to windowing process, utilizes afterwards fast fourier transform algorithm that time-domain signal is transformed to frequency domain.
Frequency-region signal after conversion is carried out to bandwidth reduction processing.To the M of a frequency domain subband signal, according to Fast Fourier Transform (FFT) character, the frequency of only need uttering long and high-pitched sounds in front M/2+1 subband search.Consider the distribution character of speech energy, M/2+1 subband signal carried out to preliminary bandwidth reduction processing, in the present embodiment, removed the subband signal below 100Hz.Then according to the acoustic characteristic of sound reinforcement system, the frequency of uttering long and high-pitched sounds can not appear in subband signal more than 20KHz, therefore the present embodiment carries out further bandwidth reduction processing to subband signal, remove subband signal more than 20KHz, the most at last M/2-N subband signal of M subband signal boil down to.
According to the time-frequency characteristic of the frequency of uttering long and high-pitched sounds, in M/2-N subband signal, the frequency of uttering long and high-pitched sounds is carried out to time-frequency combination search.Frequency domain characteristic according to the frequency of uttering long and high-pitched sounds: signal amplitude before the linear amplification region that exceeds power amplifier produces slicing phenomenon, showing as and there is no harmonic wave or the little simple signal of harmonic wave on frequency domain.Therefore the peak value searching of the present embodiment to the advanced line frequency amplitude of M/2-N subband signal, if subband signal meets following condition simultaneously, just as candidate's subband that may have the frequency of uttering long and high-pitched sounds.
Wherein:
for the amplitude of sub-band signal
According to the time domain specification of the frequency of uttering long and high-pitched sounds be: the signal of uttering long and high-pitched sounds shows as the sinusoidal signal of a continous-stable in time domain.Therefore the present embodiment carries out time-domain statistical analysis to candidate's subband signal occurrence number, in the time that the number of times of candidate's subband continuous appearance between frame and frame meets following condition, just can be judged to be to exist the subband of the frequency of uttering long and high-pitched sounds.
Wherein: Q
mfor the continuous occurrence number of subband of setting, D
ω(t-iP) be candidate's sets of subbands that i frame detects, P is the time interval between frame and frame.
Preferably, describedly within the scope of the sub-band of frequency is uttered long and high-pitched sounds in described existence, detect the frequency of uttering long and high-pitched sounds, specifically comprise:
Step 401, samples to corresponding time-domain signal in the utter long and high-pitched sounds sub-band scope of frequency of described existence;
Step 402, is compressed to original half by the utter long and high-pitched sounds frequency range of sub-band of frequency of existence;
Step 403, is transformed into the time-domain signal after sample decimation in the frequency domain of the sub-band after described compression;
Step 404, detects the frequency of uttering long and high-pitched sounds in the frequency domain of the sub-band after described compression.
Preferably, in the frequency domain of described sub-band after described compression, detect the frequency of uttering long and high-pitched sounds, specifically comprise:
Step 501, the peak point of search rate amplitude in the frequency domain of the sub-band after described compression;
Step 502, obtains the frequency corresponding with described peak point.
In the invention process row, the sub-band frequency range existing according to the frequency of uttering long and high-pitched sounds detecting, carries out N sample decimation processing doubly 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 the requirement of sampling thheorem in the frequency range of sub-band.
According to the magnitude relation of subband two sidebands, the frequency range of subband is carried out to further compression and process.For a frame signal of long M, the band width of subband is D
f=f
s/ M, wherein having the centre frequency of H subband of the frequency of uttering long and high-pitched sounds is f
h=(m-1) × f
s/ H.If the energy magnitude relationship of two subbands in left and right is P
a(m+1) >P
a(m-1), the existence range of the frequency of uttering long and high-pitched sounds is greater than the centre frequency of subband, and search frequency band is compressible is [f
h, f
h+ D
f/ 2]; Otherwise, if the energy magnitude relationship of two subbands in left and right is P
a(m-1) >P
a(m+1), the existence range of the frequency of uttering long and high-pitched sounds is less than the centre frequency of subband, and search frequency band is compressible is [f
h-D
f/ 2, f
h].
According to discrete Fourier transformation principle, the time-domain signal after sample decimation is transformed to the frequency domain within the scope of the sub-bands of frequencies after compression.
Wherein: ω
k=2 π f
k, A (ω
k, t) be ω
kthe signal amplitude of frequency, f
kcan in the frequency band after compression, freely choose according to algorithm resolution requirement, the present embodiment has been chosen the frequency resolution of 1Hz.
In frequency domain by the sub-band after compression, search for maximum A (ω
k, t), its corresponding Frequency point is just judged to be the frequency of uttering long and high-pitched sounds.
The embodiment of the present invention two has also proposed the utter long and high-pitched sounds pick-up unit of frequency of a kind of sound reinforcement system, as shown in Figure 3, comprises modular converter 1, 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, for searching for the sub-band that has the frequency of uttering long and high-pitched sounds in the bandwidth range of described frequency-region signal;
Detection module 3, for detecting the frequency of uttering long and high-pitched sounds within the scope of the sub-band of the frequency of uttering long and high-pitched sounds in described existence.
Preferably, described modular converter 1 comprises:
Divide frame unit, for dividing frame processing by the voice signal receiving;
Add window unit, for the described voice signal after point frame is carried out to windowing process;
FFT converting unit, is converted to frequency-region signal for the described voice signal after windowing is carried out to FFT.
Preferably, described search module 2 comprises:
The first hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
The second hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, carries out peak value statistics to the amplitude of described frequency-region signal in the bandwidth range after dwindling, and searches out the sub-band of the frequency of uttering long and high-pitched sounds.
Preferably, described detection module 3 comprises:
Sampling unit, samples to corresponding time-domain signal for the sub-band scope of the frequency of uttering long and high-pitched sounds in described existence;
Sub-band compression unit, is compressed to original half for the frequency range of the sub-band of frequency that existence is uttered long and high-pitched sounds;
DFT converting unit, for being transformed into the time-domain signal after sample decimation the frequency domain of the sub-band after described compression;
Detecting unit, detects for the frequency domain of the sub-band after described compression the frequency of uttering long and high-pitched sounds.
The invention provides a kind of sound reinforcement system utter long and high-pitched sounds detection method and the device of frequency, by twice compression processing to the frequency hunting zone of uttering long and high-pitched sounds, and the sample decimation processing of time-domain signal being carried out according to the frequency existence range of uttering long and high-pitched sounds, under the prerequisite that ensures frequency resolution, reduce greatly algorithm calculated amount.And the present invention only needs by twice Fourier transform, carry out frequency detection at frequency domain and just can orient accurately the frequency of uttering long and high-pitched sounds, this has reduced the complexity of hardware greatly, is convenient to the economic inhibition of uttering long and high-pitched sounds that realizes sound reinforcement system.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.
Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. the sound reinforcement system detection method for frequency of uttering long and high-pitched sounds, is characterized in that, comprises the following steps:
The voice signal collecting is converted to frequency-region signal;
There is the sub-band of the frequency of uttering long and high-pitched sounds in search in the bandwidth range of described frequency-region signal;
Within the scope of uttering long and high-pitched sounds the sub-band of frequency, described existence detects the frequency of uttering long and high-pitched sounds.
2. method according to claim 1, is characterized in that, described the voice signal collecting is converted to frequency-region signal, specifically comprises:
Divide frame processing by the voice signal receiving;
Described voice signal after point frame is carried out to windowing process;
Described voice signal after windowing is carried out to FFT and be converted to frequency-region signal.
3. method according to claim 1, is characterized in that, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal, specifically comprises:
In the bandwidth range of described frequency-region signal, search for according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds the sub-band that has the frequency of uttering long and high-pitched sounds.
4. method according to claim 3, is characterized in that, the described sub-band that has the frequency of uttering long and high-pitched sounds of searching in the bandwidth range of described frequency-region signal according to the distribution character of speech energy, system acoustic characteristic and the frequency time-frequency characteristic of uttering long and high-pitched sounds, specifically comprises:
Dwindle the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
Dwindle the frequency detecting scope of uttering long and high-pitched sounds of HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
According to the frequency time-frequency characteristic of uttering long and high-pitched sounds, in the bandwidth range after dwindling, the amplitude of described frequency-region signal is carried out to peak value statistics, search out the sub-band of the frequency of uttering long and high-pitched sounds.
5. method according to claim 1, is characterized in that, describedly within the scope of the sub-band of frequency is uttered long and high-pitched sounds in described existence, detects the frequency of uttering long and high-pitched sounds, and specifically comprises:
In the utter long and high-pitched sounds sub-band scope of frequency of described existence, corresponding time-domain signal is sampled;
The utter long and high-pitched sounds frequency range of sub-band of frequency of 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;
In the frequency domain of the sub-band after described compression, detect the frequency of uttering long and high-pitched sounds.
6. method according to claim 1, is characterized in that, detects the frequency of uttering long and high-pitched sounds in the frequency domain of described sub-band after described compression, specifically comprises:
The peak point of search rate amplitude in the frequency domain of the sub-band after described compression;
Obtain the frequency corresponding with described peak point.
7. the sound reinforcement system pick-up unit for frequency of uttering long and high-pitched sounds, is characterized in that, comprising:
Modular converter, for being converted to frequency-region signal by the voice signal collecting;
Search module, for searching for the sub-band that has the frequency of uttering long and high-pitched sounds in the bandwidth range of described frequency-region signal;
Detection module, for detecting the frequency of uttering long and high-pitched sounds within the scope of the sub-band of the frequency of uttering long and high-pitched sounds in described existence.
8. device according to claim 7, is characterized in that, described modular converter comprises:
Divide frame unit, for dividing frame processing by the voice signal receiving;
Add window unit, for the described voice signal after point frame is carried out to windowing process;
FFT converting unit, is converted to frequency-region signal for the described voice signal after windowing is carried out to FFT.
9. system according to claim 7, is characterized in that, described search module comprises:
The first hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of low frequency part in the bandwidth range of described frequency-region signal according to the distribution character of speech energy;
The second hunting zone compression unit, for dwindling the frequency detecting scope of uttering long and high-pitched sounds of HFS in the bandwidth range of described frequency-region signal according to system acoustic characteristic;
Search unit, for according to uttering long and high-pitched sounds frequency time-frequency characteristic, carries out peak value statistics to the amplitude of described frequency-region signal in the bandwidth range after dwindling, and searches out the sub-band of the frequency of uttering long and high-pitched sounds.
10. system according to claim 7, is characterized in that, described detection module comprises:
Sampling unit, samples to corresponding time-domain signal for the sub-band scope of the frequency of uttering long and high-pitched sounds in described existence;
Sub-band compression unit, is compressed to original half for the frequency range of the sub-band of frequency that existence is uttered long and high-pitched sounds;
DFT converting unit, for being transformed into the time-domain signal after sample decimation the frequency domain of the sub-band after described compression;
Detecting unit, detects for the frequency domain of the sub-band after described compression the frequency of uttering long and high-pitched sounds.
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