NDLI: Magnitude response optimization of delta operator filters

Content Provider	IEEE Xplore Digital Library
Author	Harju, P.T. Kauraniemi, J. Ovaska, S.J.
Copyright Year	1996
Description	Author affiliation: Lab. of Telecommun. Technol., Helsinki Univ. of Technol., Espoo, Finland (Harju, P.T.)
Abstract	Digital filters that use the delta operator have been shown to be less sensitive to filter coefficient quantization than filters using the shift operator when the poles and zeros lie near the point z=/spl plusmn/1. It is customary to simply round the prototype filter coefficients to the nearest fixed-point numbers for the implementation. We show that when very few bits are allocated for each coefficient in a delta filter, some other quantized point than the directly rounded point is likely to offer a magnitude response that more closely matches the required characteristics. Furthermore, a neighborhood search may even find a solution that fulfills the given specifications with fewer bits than by using direct rounding. This is of particular importance in application-specific integrated circuit implementations where expensive die area can be saved by using fewer bits to represent a coefficient. Our experiments also confirm the result that delta parameterization regularly requires at least two or three bits less than shift parameterization to fulfill the same narrowband filter specifications.
Starting Page	83
Ending Page	86
File Size	426885
Page Count	4
File Format	PDF
ISBN	0780329120
DOI	10.1109/ICSIGP.1996.566978
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital filters Quantization IIR filters Application specific integrated circuits Prototypes Narrowband Laboratories Signal processing Telecommunication computing Matched filters
Content Type	Text
Resource Type	Article

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