www.gusucode.com > MATLAB仿真技术与应用__的配套例题和习题的matlab源代码 > 第四章/example5.m
%MATLAB program 4-5 %Spectra analysis clear all; clc; Fs=64; N=64; t=1/Fs; f1=4;f2=8;f3=10; n=0:N-1; x=cos(2*pi*t*f1*n)+cos(2*pi*t*f2*n)+cos(2*pi*t*f3*n); stem(x); y=t*abs(fft(x,N)); figure; stem(y,'*');