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Optimal FIR Filters for DTMF Applications

Authors:
Pavel Zahradnik
Boris Simak
Miroslav Vlcek

Keywords: FIR filter; narrow band filter; dual-tone multi-frequency; iso-extremal approximation.

Abstract:
A fast and robust analytical procedure for the design of high performance digital optimal band-pass finite impulse response filters for dual-tone multi-frequency applications is introduced. The filters exhibit equiripple behavior of the frequency response. The approximating function is based on Zolotarev polynomials. The presented closed form solution provides formulas for the filter degree and for the impulse response coefficients. Several examples are presented.

Pages: 163 to 168

Copyright: Copyright (c) IARIA, 2013

Publication date: January 27, 2013

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-245-5

Location: Seville, Spain

Dates: from January 27, 2013 to February 1, 2013