Codebook design considerations for low bit-rate speech coding using joint segmentation-quantization

This paper considers the design of codebooks for low bit-rate speech coders which apply joint segmentation-quantization. Two issues are addressed. The first is the design of a codebook from training data when the data vectors vary in size, as dictated by the segmentation process. For this task a modification of the generalized Lloyd algorithm (GLA) is devised. The second issue is assigning indices to the codebook codewords to combat errors due to transmission over a binary symmetric channel (BSC). Two specific useful index assignment (IA) methods are presented.