Construction of the Variable-Length and Small Bitrate Quantizer for the Laplacian Source

Abstract

This paper presents the hybrid model of scalar quantizer consisted of uniform and optimized Lloyd-Max scalar quantizer. The speech signal at the entrance of the hybrid quantizer is modeled by Laplacian probability density function. Performances of the proposed quantizer are estimated on the basis of comparation of calculated values of signal to quantization noise ratio and bitrate, with the uniform quantizer with Huffman coding. The advantage of hybrid quantizer, defined by small bitrate and variable-length code words, is reflected in the compromise achieved between the distortion values and the number of quantization levels, or in other words, between the values of signal to quantization noise ratio and bitrate.