A nearly optimum linear-phase digital FIR filters design

Authors:
Marcelo Basilio Joaquim;Carlos A. S. Lucietto
Affiliations:
Electrical Engineering Department, School of Engineering of São Carlos, University of São Paulo, Av. do Trabalhador Sãocarlense, 400, São Carlos, SP, 13566-590, Brazil;Electrical Engineering Department, School of Engineering of São Carlos, University of São Paulo, Av. do Trabalhador Sãocarlense, 400, São Carlos, SP, 13566-590, Brazil
Venue:
Digital Signal Processing
Year:
2011

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Abstract

A new simple method to design linear-phase finite impulse response (FIR) digital filters, based on the steepest-descent optimization method, is presented in this paper. Starting from the specifications of the desired frequency response and a maximum approximation error a nearly optimum digital filter is obtained. Tests have shown that this method is alternative to other traditional ones such as Frequency Sampling and Parks-McClellan, mainly when other than brick wall frequency response is required as a desired frequency response.