19 Nov
2017
19 Nov
'17
2:51 p.m.
On Sun, Nov 19, 2017 at 02:15:04PM +0100, David Kastrup wrote:
Out = In*((3.47kOhm+1/(0.0033uF
s)+10kOhm-b*10kOhm)|510kOhm)
/((3.47kOhm+1/(0.0033uF s)+10kOhm+b*10kOhm)|510kOhm)
Where x|y is (xy)/(x+y) and s is the transform domain variable (for a
Fourier transform, it would correspond to 2 pi j f with j being sqrt(-1)
and f being the frequency).
This looks like the 1640 HF shelf.
If we convert this to a general IIR form, we'll
likely get more
polynomial coefficients than we are comfortable choosing all on our own.
What do you mean ? This is just a first order filter of the form
F(s) = (1 + as) / (1 + bs)
Unity gain for LF, a/b for HF.
--
FA
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