Method for removing impulsive noise in speech signals
A speech signal, impulse technology, applied in speech analysis, instruments, etc., can solve the problems of median pollution and insufficient filtering, and achieve the effect of low distortion rate and high coincidence
Active Publication Date: 2019-08-16
SICHUAN UNIV +1
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[0004] The purpose of the present invention is to solve the problem that when high-density pulse interference occurs in a certain segment of the voice, the median in the sliding window will be polluted during the filtering process of the traditional median filter method, which in turn leads to the problem that the filtering is not thorough enough. The removal method of excitatory noise, by first detecting whether the median used for replacement is polluted, such as polluting the method of replacing the median polluted by pulse interference with the left adjacent value; it can more effectively remove the impulse in the speech segment Exciting noise
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[0044] Such as Figure 1 to Figure 7 Shown; The removal method of impulse noise in speech signal, comprises the following steps:
[0045] Step 1, carry out framing to the speech segment to be processed that contains mandarin, obtain the speech time domain sequence Yi(n) after framing, i=0,1,2,...N-1, N represents the number of frames;
[0046] Step 2, set up sliding window S(z) according to the speech segment to be processed after framing in step 1, z=0, 1, 2..., Z, Z is the window size;
[0047] Step 3, the sliding window S(z) is slid along the voice time domain sequence Yi(n) direction obtained in step 1; the z value is 0 at the initial stage, and the z value is added by 1 every time the sliding window S(z) is moved;
[0048] Step 4, after each movement, define the voice time domain sequence segment in the current window as Yi, j(n), and calculate the difference sequence gi, j(n) for the voice time domain sequence segment Yi, j(n) in the window; i represents the i-th frame...
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The invention discloses a method for removing impulsive noise in speech signals. The method comprises the steps that the position of an impulse interference point is judged by detecting outliers in aspeech time domain sequence, and the reliability of a median is judged by comparing an energy value of median and an energy value of the impulse interference point; When the median is judged to be contaminated by impulse interference, the median is discarded, and a left adjacent value is used for replacing the median; when it is judged that the median meets the requirements, the median is used forreplacing an original center value in a sliding window. By comparing waveforms of a front speech segment and a rear speech segment, the inventor finds that original noisy speech contains many spike pulses, namely impulsive noise, after processing from step one to step seven, the obvious waveforms are smoother, and the spike pulses are smoothed out; thus, it is known that after filtering, the impulsive noise in the speech segment is effectively removed, and a new speech time domain sequence is obtained.
Description
technical field [0001] The invention relates to speech denoising technology, in particular to a method for removing impulsive noise in speech signals. Background technique [0002] Radio electromagnetic spectrum control is an important part of economic production and safety precautions. Due to the openness of radio broadcasting technology itself, all users who have transmission needs only need to occupy a specific frequency band to broadcast by transmitting signals. Therefore, there are often users for different purposes who occupy the frequency band without authorization to broadcast and transmit outside the frequency approved for transmission, commonly known as "black broadcast". Black broadcasting mainly sells counterfeit and shoddy products, seriously disrupting the economic order; or disrupting the normal operation of electronic communication; in some cases, it even interferes with key communication equipment, causing serious security risks. Therefore, effective manage...
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IPC IPC(8): G10L21/0224
CPCG10L21/0224
Inventor 雒瑞森王琛费绍敏冯谦郑海元龚晓峰
Owner SICHUAN UNIV