Bandpower function produces same results for different bands

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chels19 2016-7-12

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评论： chels19 2016-7-13

I'm using the bandpower function with different frequency bands. However, the results from each band are the same. The code I'm using is:

avpow = bandpower(x, fs, [0.0 0.4]) 
HF = bandpower(x, fs, [0.15 0.4]) %high frequency
LF = bandpower(x, fs, [0.04 0.15]) %low frequency
VLF = bandpower(x, fs, [0.0033 0.04]) %very low frequency

Any help is greatly appreciated.

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Answer 1

Greg Dionne 2016-7-12

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You might not be giving it enough data to resolve the lower frequencies. You generally will have a resolution on the order of fres = fs / length(x). Since your lowest frequency band ends at 0.04 Hz, make sure fres << 0.04 Hz.