csound's hilbert transform is also 6th-order. Code here: https://github.com/csound/csound/blob/2ec0073f4bb55253018689a19dd88a432ea6da46/Opcodes/ugsc.c
On Thu, Jun 23, 2016 at 9:16 AM, katja <[email protected]> wrote: > Attached is a zip with test patch for [olli~] and [hilbert~] so you > can compare and also check with different sample rates. It seems that > Olli's coefficients are optimized to work well from 20 Hz up at 44K1 > sample rate, and Pd's built-in from 80 Hz up. They both work at other > samples rates too, but with different range. > > Since the coefficients for x[n-2] and y[n-2] are non-zero in the > biquads, the maximum phase shift is as large as in any 2nd order > section, therefore I think the four sections together are 8 order > equivalent indeed. > > By the way, the abstraction in my first response wasn't completely > vanilla-compatible, this is fixed in current attachment (for anyone > else interested). > > Katja > > On Thu, Jun 23, 2016 at 6:24 AM, Alexandre Torres Porres > <[email protected]> wrote: > > Awesome, I can code it based on that :) but which order is it? > > > > I see it has 4 biquads, but it doesnt look like an 8th order because some > > coefficients are zeroed out, so I'm confused. > > > > Another question, does it work at any sample rate? This question is also > > aimed to pd's hilbert~ abstraction by the way. > > > > cheers > > > > 2016-06-22 17:27 GMT-03:00 katja <[email protected]>: > >> > >> Hi, Olli Niemitalou has coefficients published for a higher order > >> 'hilbert transformer' on http://yehar.com/blog/, attached is [olli~] > >> abstraction based on it. > >> > >> Katja > >> > >> On Wed, Jun 22, 2016 at 4:37 AM, Alexandre Torres Porres > >> <[email protected]> wrote: > >> > Howdy, I'm working on a frequency shifter object (via single sideband > >> > modulation / complex modulation). > >> > > >> > In Max they have a so called "6th order hilbert transformer with a > >> > minimum > >> > of error". In Pd, the hilbert~ abstraction is 4th order. I'm copying > the > >> > pd > >> > abstraction for now, but I was hoping to use such a higher order > filter > >> > and > >> > also use- but I can't find a source for such a formula. Any help > finding > >> > it? > >> > > >> > thanks > >> > > >> > _______________________________________________ > >> > [email protected] mailing list > >> > UNSUBSCRIBE and account-management -> > >> > https://lists.puredata.info/listinfo/pd-list > >> > > > > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list > >
_______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
