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 A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
