[Eeglablist] low-freq resolution issues in newcrossf

Nick Bedo nickbedo at yahoo.com
Mon Apr 19 00:55:13 PDT 2010


Hi all,

I'm having an issue with some vertical streaks in my cross-coherence spectrogram at the lower frequencies (<10hz).  My problem is similar to an archived problem (http://sccn.ucsd.edu/pipermail/eeglablist/2007/002006.html), but instead of having issues at high frequencies, I'm getting perturbations at the lower frequencies.  

Here is some of the output to give you an idea of my parameters:
Adjust min freq. to 0.06 Hz to match FFT output frequencies
Adjust max freq. to 49.99 Hz to match FFT output frequencies
Using hanning FFT tapering
Generating 1000 time points (128.1 to 1871.9 ms)
Finding closest points for time variable
Time values for time/freq decomposition is not perfectly uniformly distributed
The window size used is 256 samples (256 ms) wide.
Estimating 819 linear-spaced frequencies from 0.1 Hz to 50.0 Hz.

Additionally, in an effort to increase overall resolution, I've been tweaking the default settings on newcrossf():
DEFAULT_NWIN= 1000;
DEFAULT_VARWIN= 0;
DEFAULT_OVERSMP= 64;

I have tried many minor tweaks to fix the issue, but nothing seems to be working.  Any tips are appreciated!

Thanks,
Nick


      
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