filtro_lowpass

function Hd = filtro_lowpass
% filtro_lowpass Returns a discrete-time filter object.

%
% M-File generated by MATLAB(R) 7.5 and the Signal Processing Toolbox 6.8.
%
% Generated on: 13-Aug-2007 13:21:59
%

% Butterworth Lowpass filter designed using FDESIGN.LOWPASS.

% All frequency values are in Hz.
Fs = 30;  % Sampling Frequency

Fpass = 1.5;         % Passband Frequency
Fstop = 2;           % Stopband Frequency
Apass = 1;           % Passband Ripple (dB)
Astop = 80;          % Stopband Attenuation (dB)
match = 'stopband';  % Band to match exactly

% Construct an FDESIGN object and call its BUTTER method.
h  = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'butter', 'MatchExactly', match);

% [EOF]