www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@singleton/todfsymfir.m
function Hd2 = todfsymfir(Hd); %TODFSYMFIR Convert to direct-form symmetric FIR. % Hd2 = TODFSYMFIR(Hd) converts discrete-time filter Hd to % direct-form symmetric FIR filter Hd2. % Copyright 1988-2002 The MathWorks, Inc. if ~isfir(Hd) error(message('signal:dfilt:singleton:todfsymfir:DFILTErr')); end [b,a] = tf(Hd); Hd2 = dfilt.dfsymfir(b/a);