[sdiy] tanh() and approximations and warping, why is my maths wrong?
gordonjcp at gjcp.net
Mon Jun 10 22:58:53 CEST 2019
On Mon, Jun 10, 2019 at 09:11:58PM +0100, Tom Wiltshire wrote:
> I think what he’s looking for is to know why x/(1+x) gives the right warping to get the correct cutoff frequency.
> Since I know very little of how digital filter models are derived from their analog counterparts and the approximations inherent in that process, I’m not the person to ask…
That's it exactly. I'm not great at maths and the kind of algebra that
goes into this sort of thing is a bit much for me, but x/(1+x) gets the
filter tracking absolutely bang on.
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