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Mark Johnson wrote
>I myself tend to avoid FIR filters and instead gravitate
>to IIR filters, because they often have a transfer function
>that can realized in an analogue electronic circuit built
>from resistors and capacitors. Which makes for an enjoyable
>discussion under the heading "Resistor-Capacitor Circuits
>for Fun and Profit."
I have written a tutorial about how to create basic IIR filters,
both highpass and lowpass, and how to cascade them. It includes
a layman's derivation of the formulas, ready-to-use formulas for
Bessel, critically-damped, and Butterworth lowpass and highpass
filters, including cutoff adjustment factor for cascading them,
and graphs of the response curves for each.
http://unicorn.us.com/trading/allpolefilters.html
EL code for the 2-pole lowpass/highpass filters is at
http://unicorn.us.com/trading/src/_filter2pole.txt
--
,|___ Alex Matulich -- alex@xxxxxxxxxxxxxx
// +__> Director of Research and Development
// \ Unicorn Research Corporation -- http://unicorn.us.com
// __) HTML FORMATTED MAIL SENT HERE WILL BE REJECTED AS SPAM.
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