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Filterberechnung
http://www.franzis.de/
http://www.aade.com/
http://vipec.sourceforge.net/
http://ece-www.colorado.edu/~ecen2260/slides/FilterSlides.pdf
http://sepwww.stanford.edu/sep/prof/toc_html/toc_html/toc_html/pvi/spec/paper_html/node14.html
http://www.qsl.net/kp4md/butrwrth.htm
http://www.qsl.net/kp4md/filter.htm
http://www.bessernet.com/Ebutterworth/tutorialFrameset.htm
http://taco.poly.edu/selesi/butter/butter.pdf
http://www.hpmuseum.org/software/41td/butfilt.htm
http://www-users.cs.york.ac.uk/~fisher/lcfilter/
http://www.tonmeister.ca/main/textbook/
http://www.optotek.com/pdfs/note31.pdf
http://www.microindustrie.com/dsp/butter.htm
http://www.electronics-tutorials.com/filters/low-pass-filters.htm
http://my.integritynet.com.au/purdic/lowpass.html
http://kwon3d.com/theory/filtering/lpass.html
http://members.tripod.com/michaelgellis/filter.html
http://www.electronic-engineering.ch/microchip/projects/alti/docs/Filter2.pdf
http://www.electronic-engineering.ch/microchip/projects/alti/docs/Filter1.pdf
http://heureka.e-technik.uni-ulm.de/Tutorium/Virtuelles-Praktikum/aktive_filter/
http://www.hpe.fzk.de/lehre/vrl_elp_ws0001/Vorl-14.pdf
http://www.ralph-toman.de/stereosender/tiefpass.htm
http://www-s.ti.com/sc/psheets/sloa088/sloa088.pdf
http://www.emt.uni-linz.ac.at/roland/messtech_pr/node66.html
http://www.physik3.gwdg.de/~wedekind/Praktika/Elektronikpraktikum/V139/v139/