信号是否周期性?使用MATLAB函数可能吗? [英] is signal periodic or not? using MATLAB functions possible?

问题描述

使用MATLAB函数简要说明信号(非)周期性的原因

Briefly explain the reason for the (non)periodicity of a signal using MATLAB functions

像等距(信号)...

like isperiodic(signal) ...

像这样的东西吗?

推荐答案

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.

and this gives it as number of periods per cycle.

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

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