DocumentCode :
748613
Title :
Parametrically controlled noise shaping in variable state-step-back pseudo-Trellis SDM
Author :
Hawksford, M.O.J.
Author_Institution :
Univ. of Essex, Colchester, UK
Volume :
152
Issue :
1
fYear :
2005
Firstpage :
87
Lastpage :
96
Abstract :
Progress is reported in parametrically controlled noise shaping sigma delta modulator (SDM) design. As this SDM structure can provide a higher SNR than normal SDM structures, Philips Research Laboratories questioned whether further improvement could be obtained using techniques inspired by the Trellis SDM. Simulations are used here to illustrate the performance of a parametrically controlled pseudo-Trellis SDM. The technique uses uniquely a variable state step-back approach to mediate loop behaviour that is shown to achieve robust stability in the presence of aggressive noise shaping and high level signals. Comparisons are made with traditional SDM structures and LPCM systems for high-resolution audio applications.
Keywords :
audio signal processing; pseudonoise codes; sigma-delta modulation; signal denoising; signal resolution; stability; trellis coded modulation; SNR; high-resolution audio application; mediate loop behaviour; parametrically controlled noise shaping; robust stability; sigma delta modulator; signal-to-noise ratio; state-step-back pseudo-trellis SDM;
fLanguage :
English
Journal_Title :
Vision, Image and Signal Processing, IEE Proceedings -
Publisher :
iet
ISSN :
1350-245X
Type :
jour
DOI :
10.1049/ip-vis:20051076
Filename :
1408928
Link To Document :
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