Method and apparatus for processing speech signals

摘要

Processing speech signals applicable to a variety of speech processing including narrowband, mediumband and wideband coding. The speech signal is modified by a normalization process using the envelope of the speech signal such that the modified signal will have more desirable characteristics as seen by the intended processing algorithm. The modification is achieved by a point-by-point division (normalization) of the signal by an amplitudes function, which is obtained from lowpass filtering the magnitude of the signal. Several examples of normalized signal are presented. Application to pitch detection and speech coding are described herein.