2400/16,000 Bps Multirate voice processor

This paper describes a voice digitizer whose 16,000 bps data rate contains an embedded 2400 bps linear predictive coder. This 2400/16,000 bps multirate coder eliminates the need for tandeming conversion when going from 2400 bps to 16,000 bps systems and when going from 16,000-bps to 2400-bps systems. Because the 16,000 bps rate uses the principles of adaptive predictive coding, this multirate processor eliminates sensitivites to pitch and voicing inaccuracies at the 16,000 bps rate. Applications include a single-voice processor for narrowband and wideband communication systems and a single-voice digitization system for packetized voice systems requiring multirate algorithms that optimize network loading.