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    %% Allpass Filters
% Create an allpass filter and verify that the frequency response is
% allpass.

% Copyright 2015 The MathWorks, Inc.


%%

b = [1/3 1/4 1/5 1];
a = fliplr(b); 
flag = isallpass(b,a)
fvtool(b,a)

%%
% Create a lattice allpass filter and verify that the filter is allpass.

k = [1/2 1/3 1/4 1/5];
[b,a] = latc2tf(k,'allpass');
flag_isallpass = isallpass(b,a)
fvtool(b,a)