%BANDPASSFILTER Returns a discrete-time filter object.
% MATLAB Code
% Generated by MATLAB(R) 9.4 and Signal Processing Toolbox 8.0.
% Generated on: 09-Oct-2018 22:23:40
% Equiripple Bandpass filter designed using the FIRPM function.
% All frequency values are normalized to 1.
Fstop1 = 0.1; % First Stopband Frequency
Fpass1 = 0.2; % First Passband Frequency
Fpass2 = 0.6; % Second Passband Frequency
Fstop2 = 0.8; % Second Stopband Frequency
Dstop1 = 0.01; % First Stopband Attenuation
Dpass = 0.057501127785; % Passband Ripple
Dstop2 = 0.01; % Second Stopband Attenuation
dens = 20; % Density Factor
% Calculate the order from the parameters using FIRPMORD.
[N, Fo, Ao, W] = firpmord([Fstop1 Fpass1 Fpass2 Fstop2], [0 1 0], ...
[Dstop1 Dpass Dstop2]);
% Calculate the coefficients using the FIRPM function.
b = firpm(N, Fo, Ao, W, {dens});
Hd = dfilt.dffir(b);
% taps of this filter: Hd.Numerator
figure; stem(Hd.Numerator, '-b^'); grid on; zoom on; title('taps');
% frequency response
figure; freqz(Hd);
