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Analog 的代码
ex080800.m
% Chapter 8: Example 8.8
% Elliptic Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
[
ex080700.m
% Chapter 8: Example 8.7
% Chebyshev-2 Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
imp_invr.m
function [b,a] = imp_invr(c,d,T)
% Impulse Invariance Transformation from Analog to Digital Filter
% ---------------------------------------------------------------
% [b,a] = imp_invr(c,d,T)
% b
ex031700.m
% Analog Signal
Dt = 0.00005;
t = -0.005:Dt:0.005;
xa = exp(-1000*abs(t));
%
% Continuous-time Fourier Transform
Wmax = 2*pi*2000;
K = 500; k = 0:1:K;
W = k*Wmax/K;
Xa = xa * exp(-j*t'*W) * D
ex080600.m
% Chapter 8: Example 8.6
% Chebyshev-1 Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
ex080400.m
% Chapter 8: Example 8.4
% Butterworth Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 7; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
ex080800.m
% Chapter 8: Example 8.8
% Elliptic Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
[
ex080700.m
% Chapter 8: Example 8.7
% Chebyshev-2 Lowpass Analog filter design
%
Wp = 0.2*pi; Ws = 0.3*pi; Rp = 1; As = 16;
Ripple = 10 ^ (-Rp/20); Attn = 10 ^ (-As/20);
% Analog filter design:
imp_invr.m
function [b,a] = imp_invr(c,d,T)
% Impulse Invariance Transformation from Analog to Digital Filter
% ---------------------------------------------------------------
% [b,a] = imp_invr(c,d,T)
% b
c9ex7.m
Wn = 2*pi*500; % 3-dB frequency for analog prototype
n = 2; % Order of analog prototype
Fp = Wn/(2*pi); % Prewarping frequency in Hertz
Fs