  In this paper both piecewise linear and piecewise uniform approximation of
probability density function are performed. For the probability density
function approximated in these ways, a compressor function is formed. On the
basis of compressor function formed in this way, piecewise linear and piecewise
uniform companding quantizer are designed. Design of these companding quantizer
models is performed for the Laplacian source at the entrance of the quantizer.
The performance estimate of the proposed companding quantizer models is done by
determining the values of signal to quantization noise ratio (SQNR) and
approximation error for the both of proposed models and also by their mutual
comparison.
