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function Hd2 = todf1(Hd); %TODF1 Convert to direct-form 1. % Hd2 = TODF1(Hd) converts discrete-time filter Hd to direct-form 1 filter % Hd2. % Copyright 1988-2002 The MathWorks, Inc. [b,a] = tf(Hd); Hd2 = dfilt.df1(b,a);