spectrumcorrect_test.m

在FFT后信号的频率往往与谱线不相重合

%SpectrumCorrect_Test.m
close all;
clear all;
clc;
fs=1024;
N=1024;
t=(0:N-1)/fs;
x=4*cos(2*pi*80*t+30*pi/180)+3*cos(2*pi*150.232*t+80*pi/180)+1*cos(2*pi*253.5453*t+240*pi/180);
xf=fft(x);
xf=xf(1:N/2)/N*2;
XfCorrect=SpectrumCorrect(xf,3,1);
XfCorrect(:,1)=XfCorrect(:,1)*fs/N;
XfCorrect
w=hann(N,'periodic');
xfw=fft(x.*w');
xfw=xfw(1:N/2)/N*4;
XfCorrectW=SpectrumCorrect(xfw,3,2);
XfCorrectW(:,1)=XfCorrectW(:,1)*fs/N;
XfCorrectW