In article <874sm3jjk9.fsf at xsam.dyn.ml.org>,
Manuel Gebauer <manuel.gebauer at ruhr-uni-bochum.de> writes:
> I would like to filter some voltage traces through a digital low
> pass. The filter should cut off frequencies of more than about
> 2 Hz. Hardware filtering is not possible because these data are
> allready recorded and digitized.
>> Are there any software applications? Or do you know any algorithms
> wich may be implemented in a small program?
Try SciLab. It comes with a good introduction to filter design.