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

%   Copyright 1990-2000 The MathWorks, Inc.
%   $Revision: 1.2 $  $Date: 2000/06/16 22:24:04 $

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

