LPC Models and Different Speech Enhancement Techniques-A Review

Authorhas already published one review paper on the quality enhancement of a speech signal by minimizing the noise.This is a second paper of same series. In last two decades the researchers have taken continuous efforts to reduce the noise signal from the speech signal. This paper comments on,various study carried out and analysis proposals of the researchers for enhancement of the quality of speech signal. Various models, coding, speech quality improvement methods, speaker dependent codebooks, autocorrelation subtraction, speech restoration, producing speech at low bit rates, compression and enhancement are the various aspects of speech enhancement. We have presented the review of all above mentioned technologies in this paper and also willing to examine few of the techniques in order to analyze the factors affecting them in upcoming paper of the series