I have EEG signal with a sampling frequency of
128 Hz, and filtered from
1-30 Hz using a bandpass filter. Now I want to know while decomposing the signal; does
DWT decomposes it based on sampling frequency or cutoff frequency? Detailed Coefficients one should be
7.5-30 (if consider cutoff frequency), or
32-64 (if consider sampling frequency).
If we consider the cutoff frequency, we now that upper limit is a bit higher than
30, so how can we correctly justify it?
I am using python pywavelets and want to compute the frequency range of decomposed level.