信号是否周期性？使用MATLAB函数可能吗？ - MATLAB爱好者论坛-LabFans.com

poster · 2019-12-10, 20:48

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？

回答：

fft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');

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2019-12-10, 20:48	#1
poster 高级会员注册日期: 2019-11-21 帖子: 3,006 声望力: 66	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？回答： fft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'); 更多&回答...