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% exa4-12_butterstopDF.m , for example 4-12 % using butterworth to design bandstop DF clear all; Wp=[0.4*pi,0.7*pi]; Ws=[0.2*pi,0.8*pi]; Ap=1; As=30; [N,wn]=buttord(Wp/pi,Ws/pi,Ap,As); %计算巴特沃

% exa4-8_pulseDF for example4-8 % using Butterworth analog lowpass filter to design digital lowpass filter %利用模拟Butterworth滤波器设计数字低通滤波器 %脉冲响应不变法 wp=0.2*pi; ws=0.3*pi; Rp=1; As=15; T=1; %性能

% exa4-11_butterbandDF.m , for example 4-11 % using butterworth to design bandpass DF clear all; Wp=[0.3*pi,0.4*pi]; Ws=[0.2*pi,0.5*pi]; Ap=3; As=18; [N,wn]=buttord(Wp/pi,Ws/pi,Ap,As); %计算巴特沃

% exa4-10_butterhighDF.m , for example 4-10 % using butterworth to design highpass DF clear all; Wp=0.6*pi; Ws=0.4*pi; Ap=1; As=15; [N,wn]=buttord(Wp/pi,Ws/pi,Ap,As); %计算巴特沃斯滤波器阶次和截止频率 [b,a]

% exa4-12_butterstopDF.m , for example 4-12 % using butterworth to design bandstop DF clear all; Wp=[0.4*pi,0.7*pi]; Ws=[0.2*pi,0.8*pi]; Ap=1; As=30; [N,wn]=buttord(Wp/pi,Ws/pi,Ap,As); %计算巴特沃

% exa4-6_lp2bp for example4-6 % chebshev I analog lowpass filter prototype to bandpass filter clear all; N=5; Rp=3; wl=200*pi; wh=1000*pi; % Chebyshev analog lowpass filter prototype [z,p,k

% exa4-7_lp2bs for example4-7 % chebshev I analog lowpass filter prototype to bandstop filter clear all; N=9; Rp=3; wl=200*pi; wh=1000*pi; % Chebyshev analog lowpass filter prototype [z,p,k

% exa4-5_lp2hp for example4-5 % chebshev I analog lowpass filter prototype to highpass filter clear all; N=9; Rp=10; wl=400*pi; [z,p,k]=cheb1ap(N,Rp); [b,a]=zp2tf(z,p,k); % design analog hi

M= 2 N= 3 A: 0.9 0.05 0.05 0.45 0.1 0.45 0.45 0.45 0.1 B: 0.5 0.5 0.75 0.25 0.25 0.75 pi: 0.333 0.333 0.333

M= 2 N= 3 A: 0.5 0.2 0.2 0.2 0.4 0.4 0.1 0.45 0.45 B: 0.5 0.5 0.75 0.25 0.25 0.75 pi: 0.333 0.333 0.333