LOW-RATE SPEECH CODING FOR TELECOMMUNICATIONS

Over rite last decade major advances have been made in speech coding t echnology which is used in international, digital mobile and satellite networks. The most recent techniques permit telephone network quality speech transmission at 8 kbit/s, but there are still demands for even lower rates and more flexible, good quality coding techniques for var ious network applications. This paper reviews the developments so far, and describes a new class of speech coding methods known as speech in terpolation coding which has the potential to provide toll-quality spe ech coding at or below 4-kbit/s.