Application of direct vector quantization to speech coding algorithm
Xueying Zhang · Computer Engineering and Applications Journal · 2008
The article introduces the principle of the Direct Vector Quantization(DVQ) algorithm which is applied to emulation encoder module and codebook search module in LD-CELP speech coding algorithm.The synthesis filter in emulation encoder module is replaces by the inverse perceptual filter,removing the operation of impulse response h(n) in the codebook search module.The result show that the DVQ algorithm reduced its complexity and improved the efficiency of codebook search and the time is 3~5 second less than that of LD-CELP algorithm while keeping the quality.