On Sun, Feb 6, 2011 at 11:15 PM, Mathieu Bouchard <[email protected]> wrote: > On Sun, 6 Feb 2011, Spencer Russell wrote: > >> [1] gives the magnitude frequency response given the biquad >> coefficents, and it linked to from several places around the net. Is >> this the sort of thing you're looking for? >> [1] http://bit.ly/eFck4j > > This link got me directly to : > > USB complete: everything you need to develop custom USB peripherals > Par Jan Axelson > Chapitre 12 > Page 364 > > and nothing else. (??) >
Whoops, I meant to send this: http://bit.ly/gUCBu4. Sorry. Here he's basically just taken the transfer function of a biquad and made the z = exp(j*w/Fs) as Mike suggested, followed by taking the magnitude and log-scaling for dB, but he's done the algebraic legwork. Just note that w (lower-case omega) is 2*pi*f and you should be good to go. He's also done some trig-substitution for more numerical precision. -s _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
