untitled.m

利用DFT分析模拟信号频谱,并附有实验报告说明和源码

N=200;
L=512;
fs=100;
T=1/fs;
ws=2*pi*fs;
t=(0:N-1)*T;
f=exp((-2)*t);
F=fftshift(fft(f,L));
w=(-ws/2+(0:L-1)*ws/L)/2*pi;
plot(w,abs(F));
xlabel('w');
ylabel('exp((-2*t))*[u(t)-u(t-2)]的幅度谱')