Next: Re-sampling
Up: Post-processing
Previous: Editing
Contents
Filtering
In some cases you might need to filter your raw data. Very often this will be
necessary when you intend to down-sample your raw data (see following
section). But it might also be the case that you encounter a constant
disturbance in your recorded signal data that cannot be avoided in the
recording. Typically these are 50/60Hz hums that might be filtered very
effectively using a digital high pass or notch filter. You may design your own filter
or use tools like genfilt from the public
domain SFS software package7.6.
Use a different suffix for the filtered signal files to avoid confusion and
double filtering of the same data. Refer also to [13] for a more
detailed discussion of techniques to improve the quality of your recorded
signals.
BITS Projekt-Account
2004-06-01