Help_about 'time-frequency represengtations of power'
lwn_07 at YAHOO.COM.CN
Tue Nov 13 09:59:30 CET 2007
I am a new learner in MEG signal processing by using fieldtrip. And I
need some help in understanding the tutorials of time-frequency
represengtations of power.
In the tutorials of calculating TFRs with frequency dependent window
length,there is a sentence "The analysis is best done by first selecting
the numbers of cycles per time window which will be the same for all
frequencies"; and "When choosing this parameter it is important that a
full number of cycles fit within the time-window for a given frequency".
---so what is 'cycles' mean? How can explain it?
and "cfg.t_ftimwin = 7./cfg.foi; % 7 cycles per time window"
---then does the cycles has any relation to the frequency of interest?
How should I select the number of cycles, is there a rule?
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