Construction of Highly Accurate Segment Companding Voice Codec

Construction of a highly accurate segment companding voice codec is described in this paper. It is shown that an ideal precompressor placed in front of the segment coder enables moderating the accuracy required by 4 times in the 13-segment coder and by 8 times in the 15-segment coder. Two precompressor circuits with a negligible accuracy degradation are proposed and their performances are thoroughly discussed. It is shown that highly accurate sequential feedback segment companding coders, such as the 8-bit 13- or 15-segment coder, can be realized easily with these precompressors.