NDLI: Accurate subband coding with low resolution quantization

Content Provider	IEEE Xplore Digital Library
Author	Cvetkovic, Z.
Copyright Year	1998
Abstract	Redundant signal expansions exhibit robustness to degradation by additive noise, at a degree which is proportional to expansion redundancy. This property can be exploited for obtaining accurate signal representations with low resolution quantization, and it has been used in oversampled A/D conversion. A problem with this approach to source coding is that the bit-rate increases linearly with expansion redundancy giving poor rate-distortion performances. Entropy coding schemes that could remedy the problem of fast increase of the bit-rate have not yet been studied in general. An example of a redundant expansion which is amenable to efficient encoding of quantized samples is discussed. A quantitative characterization of noise reduction properties of redundant expansions is given first. Then, a subband coding scheme based on overcomplete short-time Fourier expansions and low resolution quantization is discussed. This scheme allows for efficient lossless encoding of quantized expansion coefficients, with a logarithmic increase of the bit-rate with redundancy. Thus, it attains an exponential error decay in the bit-rate.
Starting Page	448
Ending Page	457
File Size	415886
Page Count	10
File Format	PDF
ISBN	0818684062
ISSN	10680314
DOI	10.1109/DCC.1998.672192
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantization Redundancy Signal resolution Encoding Noise robustness Degradation Additive noise Signal representations Source coding Rate-distortion
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications

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