Title :
On Modeling Mismatch Errors Induced by Different Quantizers
Author :
Tillo, Tammam ; Grangetto, Marco ; Olmo, Gabriella
Author_Institution :
Politecnico di Torino, Turino
Abstract :
In this letter, the mismatch error due to the replacement of a fine with a coarse quantizer is considered, and an analytical model is proposed to describe the related distortion. Simulations show that this model is highly accurate and can be used to estimate the expected distortion of DPCM-based codecs in order to better allocating the rate. For highly correlated sources, this leads to a gain of 1 to 1.5 dB over an exhaustive search method that adopts a uniform redundancy allocation. Moreover, it permits to allocate the redundancy by an easy-to-solve analytical model of the system.
Keywords :
codecs; differential pulse code modulation; error analysis; quantisation (signal); redundancy; DPCM; analytical model; codecs; modeling mismatch errors; quantizer; uniform redundancy allocation; Analytical models; Codecs; Encoding; Entropy; Performance analysis; Probability density function; Quantization; Redundancy; Resilience; Search methods; Multiple description coding; mismatch error distortion; quantization mismatch; redundant representations;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2007.903271
