NDLI: Variable Digital Filter With Group Delay Flatness Specification or Phase Constraints

Content Provider	IEEE Xplore Digital Library
Author	Hai Huyen Dam Cantoni, A. Nordholm, S. Kok Lay Teo
Copyright Year	2004
Abstract	In this paper, we consider the design of finite-impulse response variable digital filters (VDFs) with variable cutoff frequency or variable fractional delay. We propose the design of VDFs with minimum integral squared error and constraints on the maximum error deviation in conjunction with flatness group delay specification or phase constraints. These specifications allow the VDFs to have approximately linear phase, especially in the passband. As these specifications are required to be satisfied for all the filters generated by the VDF with controllable spectral characteristics, the linear constraints resulting from the flatness specification are relaxed to inequality constraints. To make the optimization problem tractable for the phase constrained problem, suitable approximations are employed in the paper. The design problem is formulated as an optimization problem with a quadratic cost function and infinite number of constraints. A numerical scheme with adaptive grid step size is proposed for solving the optimization problem.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	442
Ending Page	446
Page Count	5
File Size	529746
File Format	PDF
ISSN	15497747
Volume Number	55
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital filters Delay Constraint optimization Cutoff frequency Linear approximation Passband Nonlinear filters Character generation Design optimization Cost function variable digital filter (VDF) Group delay flatness phase constraint
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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