Speech coding and speech recognition technologies: a review

The authors provide an overview of the recent developments in the area of speech processing and in particular in the fields of speech coding and speech recognition. The speech coding review covers DPCM (differential pulse code modulation) coders, model-based vocoders, waveform coders, and hybrid coders. The hybrid coders are described in some detail since they are the subject of current research. The present treatment of speech recognition techniques concentrates on the methodologies for voice recognition and the progress made in speaker-independent recognition. Efforts towards commercial deployment of this technology are also briefly described.<>