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Analog 的代码
butter.m
function [num, den, z, p] = butter(n, Wn, varargin)
%BUTTER Butterworth digital and analog filter design.
% [B,A] = BUTTER(N,Wn) designs an Nth order lowpass digital
% Butterworth filter and re
iirchk.m
function [btype,analog,errStr] = iirchk(Wn,varargin)
%IIRCHK Parameter checking for BUTTER, CHEBY1, CHEBY2, and ELLIP.
% [btype,analog,errStr] = iirchk(Wn,varargin) returns the
% filter type
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:
[
ex082200.m
% Chapter 8: Example 8.22
% Butterworth Lowpass Filter Design:
% Use of the CHEBY1 function
%
% Digital Filter Specifications:
wp = 0.2*pi; %digi
ex082400.m
% Chapter 8: Example 8.24
% Elliptic Lowpass Filter Design:
% Use of the ELLIP function
%
% Digital Filter Specifications:
wp = 0.2*pi; %digital
ex082100.m
% Chapter 8: Example 8.21
% Butterworth Lowpass Filter Design:
% Use of the BUTTER function
%
% Digital Filter Specifications:
wp = 0.2*pi; %digi
ex082300.m
% Chapter 8: Example 8.23
% Butterworth Lowpass Filter Design:
% Use of the CHEBY2 function
%
% Digital Filter Specifications:
wp = 0.2*pi; %digi
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: