Abstract
Single channel speech enhancement in noisy environments is studied in this paper. Traditional speech enhancement methods that based on short time spectral analysis frequently introduce harmonic distortion due to imprecise noise spectral estimation. A kind of technology which is called harmonic regeneration is used to overcome the defect of traditional speech enhancement methods, and damaged harmonics are restored. Firstly, a non-linear operation is used on the harmonic distorted signal to generate an artificial signal which contains all of harmonics of pure speech signal. Secondly, the artificial signal is used to correct the traditional noise reduction gain function, and the purpose of harmonic reservation is reached. Theoretical analysis, objective and subjective results indicate that the harmonic regeneration algorithm can improve speech quality dramatically. The computational complexity of the new algorithm is rather low, and it can be easily implemented in real time applications.
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