www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@singleton/todffir.m
function Hd2 = todffir(Hd); %TODFFIR Convert to direct-form FIR. % Hd2 = TODFFIR(Hd) converts discrete-time filter Hd to direct-form FIR % filter Hd2. % Copyright 1988-2002 The MathWorks, Inc. if ~isfir(Hd) error(message('signal:dfilt:singleton:todffir:DFILTErr')); end [b,a] = tf(Hd); Hd2 = dfilt.dffir(b/a(1));