BUFFERED DIGITAL SPEECH INTERPOLATION WITH FIXED-DELAY.

While in conversation, a speaker alternates between talkspurts and silences, and is in talkspurt for less than half the time. This fact motivated the design of time assigned speech interpolation (TASI) on FDM channels and digital speech interpolation (DSI) on TDM channels. In the fixed-delay buffered DSI scheme proposed here, fill-in is not required. Hence, all the silences that naturally occur in speech are fully utilized. Since fill-in is not used, the talkspurts and silences have shorter mean durations. Consequently, substantial increase in the DSI advantage is achieved in the fixed-delay buffered DSI scheme. We present a discrete-time analysis of the scheme.