DSP数字信号处理题目求解

2025-01-03 02:32:46

推荐回答（1个）

回答1：

%采样频率

Fs = 8000;

% 通带和阻带截至频率

fp = 1500; fs = 3000;

% 归一化的通带和阻带频率

wp = fp/(Fs/2); ws = fs/(Fs/2); %

% 通带和阻带衰减

rp = 3; rs = 10;

% 估计Butterworth 滤波器的阶次和频率

[n,wn] = buttord(wp,ws,rp,rs);

[b,a] = butter(n,wn);

[h,f] = freqz(b,a,512,Fs);

subplot(211),plot(f,20*log(abs(h)));grid;

xlabel('Frequency /Hz'); ylabel('Magnitude');title('幅频特性')

subplot(212),plot(f,unwrap(angle(h)));grid;

xlabel('Frequency /Hz'); ylabel('Phase');title('相频特性')