Joint codebook design for summation product-code vector quantizers

Abstract

With respect to the generalized product code (GPC) model for structured vector quantization, multistage VQ (MSVQ) and tree-structured VQ are members of a family of summation product codes (SPCs), defined by the prototypical synthesis function x=f/sub 1/+...+f/sub s/, where f/sub i/, i=1, . . ., s are the residual vector features. The authors describe an algorithm paradigm for the joint design of the feature codebooks constituting a GPC. They specialize the paradigm to a joint design algorithm for the SPCs and exhibit experimental results for the MSVQ of simulated sources. The performance improvements over conventional 'greedy' design are essentially 'free' as the only cost is a moderate increase in design complexity.<>