Audio pre-processing methods and apparatus.

摘要

A sinusoidal speech representation system is applied to the problem of speech dispersion. The sinusoidal system first estimates (16) and then removes (18) the natural phase dispersion in the frequency components of the speech signal. Artificial dispersion based on pulse compression techniques is then introduced with little change in speech quality. The new phase dispersion allocation serves to preprocess the waveform prior to dynamic range compression (20) and clipping (22), allowing considerably deeper thresholding than can be tolerated on the original waveform.