Coefficient dither in fixed-point fir digital filters
Dey, S.R.
Oppenheim, A.V.
Digital Signal Process. Group, Massachusetts Inst. of Technol., Cambridge, MA
This paper appears in: Signals, Systems and Computers, 2008 42nd Asilomar Conference on Publication Date: 26-29 Oct. 2008
On page(s):
556
- 560
Location: Pacific Grove, CA
ISSN: 1058-6393
ISBN: 978-1-4244-2940-0
Digital Object Identifier: 10.1109/ACSSC.2008.5074467
Current Version Published: 2009-06-12
Abstract
This paper presents dynamic coefficient dither as a method to mitigate coefficient quantization error in FIR filters. The uncorrelated, shapeable noise from dithered coefficients may be preferable, in certain contexts, to the frequency response distortion due to static fixed-point implementation. A theoretical framework for the analysis of coefficient dither is developed. Performance, fundamental tradeoffs, and optimization of dithered filter implementations are discussed. Oversampling is shown to improve the SNR. The theoretical results are validated with numerical experiments.
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