untitled2.m

应用离散傅里叶变换DFT

N=256;
L=256;
fs=16;
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))的幅度谱')