```Tim Wescott wrote:
> tim w wrote:

...

>> -Also, the variable "fc" is the corner frequency. What is that on how do
>> I set it???
> In a band stop filter fc is the center frequency of the stop band.  In
> your transfer function everything is scaled in time, with "To".  For fc
> in Hz, fc = 1/(2 * pi * To).

Other tim,

Remember to prewarp the critical frequencies. Rick's book goes into it,
and so do many other sources. Robert Bristow-Johnson wrote a clear
description (in comp.dsp, I think); Google should turn it up. If not,
Tim or I can describe the process, the equation is simple.

Jerry
--
Engineering is the art of making what you want from things you can get.
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```