DocumentCode
933534
Title
On Modeling Mismatch Errors Induced by Different Quantizers
Author
Tillo, Tammam ; Grangetto, Marco ; Olmo, Gabriella
Author_Institution
Politecnico di Torino, Turino
Volume
14
Issue
11
fYear
2007
Firstpage
785
Lastpage
788
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;
fLanguage
English
Journal_Title
Signal Processing Letters, IEEE
Publisher
ieee
ISSN
1070-9908
Type
jour
DOI
10.1109/LSP.2007.903271
Filename
4351963
Link To Document