0000193: Temporal Filter does not seem to affect signal

(0001256)
brylie (reporter)
2017-08-10 18:39

I also attached a screenshot of the scenario and visualizations.

(0001257)
brylie (reporter)
2017-08-10 18:47

On closer inspection of the screenshot, there does seem to be some difference between the signals. It is just not as pronounced as I was expecting with an 8-12Hz bandpass filter. What can I do to filter the signal so that only 8-12Hz frequencies pass through?

(0001260)
jtlindgr (administrator)
2017-09-06 13:04

I suggest increasing the amount of data the FFT gets (use time based epoching with a large enough epoch) in order to see the spectrum in more detail. The 8-12 should be pronounced with relation to the rest. Note also the typical 1/f decay of the eeg fft. High freqs will naturally have little power.

(0001270)
jtlindgr (administrator)
2018-08-24 15:13

In my experiments Temporal Filter seems to work as intended. If you encounter this problem while giving the FFT a larger signal epoch for a better estimate, please reopen the bug.

Notes
(0001256) brylie (reporter) 2017-08-10 18:39	I also attached a screenshot of the scenario and visualizations.

(0001257) brylie (reporter) 2017-08-10 18:47	On closer inspection of the screenshot, there does seem to be some difference between the signals. It is just not as pronounced as I was expecting with an 8-12Hz bandpass filter. What can I do to filter the signal so that only 8-12Hz frequencies pass through?

(0001260) jtlindgr (administrator) 2017-09-06 13:04	I suggest increasing the amount of data the FFT gets (use time based epoching with a large enough epoch) in order to see the spectrum in more detail. The 8-12 should be pronounced with relation to the rest. Note also the typical 1/f decay of the eeg fft. High freqs will naturally have little power.

(0001270) jtlindgr (administrator) 2018-08-24 15:13	In my experiments Temporal Filter seems to work as intended. If you encounter this problem while giving the FFT a larger signal epoch for a better estimate, please reopen the bug.

Issue History
Date Modified	Username	Field	Change
2017-08-10 18:39	brylie	New Issue
2017-08-10 18:39	brylie	File Added: GDF-temporalFilter.xml
2017-08-10 18:39	brylie	File Added: Screenshot_20170810_193612.png
2017-08-10 18:39	brylie	Note Added: 0001256
2017-08-10 18:47	brylie	Note Added: 0001257
2017-09-06 13:04	jtlindgr	Note Added: 0001260
2018-08-24 15:13	jtlindgr	Note Added: 0001270
2018-08-24 15:13	jtlindgr	Status	new => resolved
2018-08-24 15:13	jtlindgr	Resolution	open => unable to reproduce
2018-08-24 15:13	jtlindgr	Assigned To	=> jtlindgr

Relationships