A 16 kbit/s speech coder using a single DSP device

This paper describes a 16 kbit/s sub-band speech coder. The algorithm used is simple enough for the coder and decoder each to be implemented on a single DSP chip, yet the speech quality is highly acceptable when listened to through a standard telephone handset. The algorithm is structured such that four speech channels may be multiplexed into a single 64 kbit/s channel with no additional information being required for frame alignment. It is thought that the algorithm could easily be modified to give reliable transmission of voice-band data at rates up to 2.4 kbit/s with no loss of speech quality.