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Fast Fourier Transform<br />
■ Efficient code but the data set must be<br />
2 n long<br />
■ Use Excel or Matlab to perform FFT<br />
■ If the data set is odd, cut to 2 n or<br />
append to 2 n data points, preferably in<br />
full cycles<br />
■ Identify harmonic contents from the<br />
result of FFT
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