Coefficient dither in fixed-point fir digital filters

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...

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Bibliographic Details
Main Authors: Dey, S.R., Oppenheim, A.V.
Format: Conference Proceeding
Language:English
Subjects:
coefficient quantization
Delay
Digital filters
Digital signal processing
dither
Finite impulse response filter
fixed-point filters
Frequency response
Noise shaping
Quantization
Random processes
Signal to noise ratio
vector binary processes
Very large scale integration
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Summary: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.
ISSN:1058-6393
2576-2303
DOI:10.1109/ACSSC.2008.5074467