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Re: Lowpass & Highpass Filter Recipes



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--- Alex Matulich <alex@xxxxxxxxxxxxxx> wrote:

> To all who are interested, and know how to copy
> mathematical
> formulas into computer code:
> 
> I have completed compiling the recipes and test
> results for
> Butterworth, Bessel, and Critically-Damped filters,
> both low-pass
> and high-pass.  Step-by-step calculations are
> available at
> 
>    http://unicorn.us.com/trading/2polefilters.html
> 
> EasyLanguage source code that implements ALL of
> these filters in a
> single function is at
> 
>   
> http://unicorn.us.com/trading/src/_filter2pole.txt
> 
> It's unbelievable how little information exists to
> construct a
> general-purpose Bessel filter with an arbitrary
> cutoff.  I had to
> learn how to derive that one myself.
> 


Thank you immensely for freely sharing your
outstanding work with us.

Regards