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On which frequency i should apply DWT (wavelet transform), sampling frequency or output bandwidth

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amit_neuro
amit_neuro 2013-3-3
i have emotiv epoch for EEG signal acquisition. If band width of Emotiv is 2-43 Hz and sampling frequency is 128 Hz then upto which i should apply DWT, On 2-43 Hz or On 128 Hz?????

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Wayne King
Wayne King 2013-3-3
If your sampling frequency is 128 Hz, then the approximate frequency bands in the DWT are already determined by the sampling frequency.
They are: (Scaling filter band on left, wavelet filter band on right)
[0 32] [32 64] Hz
[0 16] [16 32] Hz
[0 8] [8 16] Hz
[0 4] [4 8] Hz
and so on.
You notice that the band 2-43 Hz is best localized (but certainly not perfectly) in the 1st level approximation coefficients.
What not just use a good filter if you are just using the DWT to perform a frequency-filtering of your signal?

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