Speech Enhancement Method Based on Improved Harmonic Retrieval Algorithm
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The higher harmonic part of the speech signal is completely overwhelmed by the noise when Signal to Noise Ratio(SNR) is low.In response to this situation,a new algorithm is proposed.A quasi-periodic impulse signal is calculated based on the distorted signal processed by MMSE-LSA algorithm using a nonlinearity to regenerate harmonics.This artificial signal is then used to multiply the original enhanced signal,making the voice of the harmonic components to be prominent.Experimental results show that the algorithm is a good solution to the problem of Harmonic distortion better and is better than the traditional algorithm when improving the voice quality of high harmonics in low SNR.