Re: [music-dsp] Trapezoidal and other integration methods appliedtomusical resonant filters

2011-05-22 Thread Martin Eisenberg
Vadim, is this the article you meant? Fontana, Preserving the structure of the Moog VCF in the digital domain Proc. Int. Computer Music Conf., Copenhagen, Denmark, 27-31 Aug. 2007 http://quod.lib.umich.edu/cgi/p/pod/dod-idx?c=icmc;idno=bbp2372.2007.062 Many papers on delay-free loops say

Re: [music-dsp] Trapezoidal and other integration methods appliedtomusical resonant filters

2011-05-21 Thread robert bristow-johnson
On May 20, 2011, at 7:43 AM, Ross Bencina wrote: robert bristow-johnson wrote: i don't have time now to complete the analysis, but here is my first pass at getting the z-plane transfer function (something to compare to the DF1 or DF2). Thanks very much Robert, yer welcome. i think i

Re: [music-dsp] Trapezoidal and other integration methods appliedtomusical resonant filters

2011-05-21 Thread robert bristow-johnson
On May 21, 2011, at 11:27 PM, robert bristow-johnson wrote: t-1t y(t) = integral{ x(u) du} + integral{ x(u) du} -inf t-1 ~= t(t-1) + x(t) this should be

Re: [music-dsp] Trapezoidal and other integration methods appliedtomusical resonant filters

2011-05-20 Thread Ross Bencina
robert bristow-johnson wrote: i don't have time now to complete the analysis, but here is my first pass at getting the z-plane transfer function (something to compare to the DF1 or DF2). Thanks very much Robert, I was able to follow your analysis below. Previously I didn't really

Re: [music-dsp] Trapezoidal and other integration methods appliedtomusical resonant filters

2011-05-18 Thread theandersoncouncil
You can find more of Tim's work here: https://ccrma.stanford.edu/~stilti/papers/ His Thesis is exceptional, I highly recommend giving it a look. cheers, -Brian On May 16, 2011, at 12:42 PM, Ross Bencina rossb-li...@audiomulch.com wrote: Vadim Zavalishin wrote: Somewhere I recently found a