Removing linear trend
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If linear trend appears in the signal (i.e. the whole signal raises or falls monotonously), it can affect the calculation of low frequency components in the FFT. With the help of Signal tools/Remove linear trend option, you can transform the origin signal to a new signal without linear trend. That signal can be used for further analysis. Linear trend will be removed by subtracting signals linear least squares approximation from the original signal.
If you want this operation to be performed before each FFT calculation, you can set it in Spectral analysis defaults .
Removing linear trend