%% Frequency Response of a Lowpass Analog Bessel Filter
% Design a 5th-order analog lowpass Bessel filter with an approximately constant group delay up to 10^4 rad/s. Plot the frequency response of the filter using freqs.

[b,a] = besself(5,10000);   % Bessel analog filter design
freqs(b,a)                  % Plot frequency response

% Copyright 2015 The MathWorks, Inc.