信号是否周期性？使用MATLAB函数可能吗？
 

使用MATLAB函数简要解释信号（非）周期性的原因

像等周期（信号）...

这样的事吗？



[B]回答：[/B]

[URL="http://www.mathworks.com/help/techdoc/ref/fft.html"]fft[/URL]可以做到：

Y = fft(signal); periodLength = 'second'; %or whatever units your signal was acquired in. N = length(Y); Y(1) = []; power = abs(Y(1:floor(N/2))).^2; nyquist = 1/2; freq = (1:floor(N/2))/floor(N/2)*nyquist; figure; plot(freq,power) grid on xlabel(['cycles/' periodLength]); title('Frequency plot'); 这就是每个周期的周期数。

period = 1./freq; figure; plot(period,power) grid on ylabel('Power') xlabel(['Period (' periodLength 's/Cycle)']); title('Period Plot');

[url=https://stackoverflow.com/questions/4142222]更多&回答...[/url]