Speech Enhancement Method Based on Improved Harmonic Retrieval Algorithm

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.