%%设计截止频率为50HZ的6阶巴特沃斯低通滤波器%[filtered_signal,filtb,filta]=lopass_butterworth(inputsignal,cutoff_freq,Fs,order)%INPUTS:%inputsignal=input time series%cutoff_freq=filter corner frequency%Fs=data sampling frequency%order=order of Butterworth filter%OUTPUTS:%filtered_signal=the filtered t...
[N,wn]=buttord(wp,ws,Ap,As);%计算巴特沃斯滤波器阶次和截止频率 %N为滤波器阶数 wn为滤波器截止频率 数字滤波器 [b,a]=butter(N,wn,'bandpass');%频率变换法设计巴特沃斯带通滤波器 [db,mag,pha,grd,w]=freqz_m(b,a); %求出巴特沃斯带通滤波器幅频、幅度、相位等 subplot(2,1,1) plot(w*Fs...
[N,wn]=buttord(wp,ws,Ap,As);%计算巴特沃斯滤波器阶次和截止频率 %N为滤波器阶数 wn为滤波器截止频率 数字滤波器 [b,a]=butter(N,wn,'bandpass');%频率变换法设计巴特沃斯带通滤波器 [db,mag,pha,grd,w]=freqz_m(b,a); %求出巴特沃斯带通滤波器幅频、幅度、相位等 subplot(2,1,1) plot(w*Fs...