function Hd = chebyshev_IIR2
%CHEBYSHEV_IIR 返回离散时间滤波器对象。

% MATLAB Code
% Generated by MATLAB(R) 9.10 and Signal Processing Toolbox 8.6.
% Generated on: 06-May-2022 09:49:00

% Chebyshev Type I Bandpass filter designed using FDESIGN.BANDPASS.

% All frequency values are in Hz.
Fs = 20;  % Sampling Frequency

Fstop1 = 0.7;        % First Stopband Frequency
Fpass1 = 0.8;         % First Passband Frequency
Fpass2 = 1.9;         % Second Passband Frequency
Fstop2 = 2;        % Second Stopband Frequency
Astop1 = 40;          % First Stopband Attenuation (dB)
Apass  = 3;           % Passband Ripple (dB)
Astop2 = 40;          % Second Stopband Attenuation (dB)
match  = 'passband';  % Band to match exactly

% Construct an FDESIGN object and call its CHEBY1 method.
h  = fdesign.bandpass(Fstop1, Fpass1, Fpass2, Fstop2, Astop1, Apass, ...
                      Astop2, Fs);
Hd = design(h, 'cheby1', 'MatchExactly', match);

% [EOF]