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    function f = filtobj(xfree,x,xmask,n,h,maxbin)
%FILTOBJ Returns frequency response for DFILDEMO.

%   Copyright 1990-2006 The MathWorks, Inc.

x(xmask)  = xfree;
h2=abs(freqz(x(1:n), x(n+1:2*n), 128));
f= h2 - h;