Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-13 Thread STEFFAN DIEDRICHSEN
On 13.11.2013, at 12:54, Vadim Zavalishin vadim.zavalis...@native-instruments.de wrote: So, after we have modelled them all, we are not gonna need any further modelling. ;-) At that time,we should offer real-time spice to let our dear customers tinker with their virtual circuits. We’ll

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread douglas repetto
Urs, I don't know if you're referring to music-dsp here, but this list is specifically not meant to be in the academic realm, but rather a place where people of all sorts with an interest in music and digital signal processing can chat. So I encourage you to share your results here! I'm

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread robert bristow-johnson
On 11/9/13 6:52 PM, Andrew Simper wrote: Marco writes: Well, of course the s = (T/2)(z-1)/(z+1) conversion comes from discretizing a differential equation. but remember, that's not the only way to convert s to z. that's the bilinear way to do it. ... What I would say more about this

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread Urs Heckmann
On 11.11.2013, at 01:33, robert bristow-johnson r...@audioimagination.com wrote: but you cannot define your current output sample in terms of the current output sample. But that, with all due respect, is what has been done for quite a while. It isn't the major ingredient of great sound,

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread robert bristow-johnson
On 11/10/13 5:12 PM, Urs Heckmann wrote: On 11.11.2013, at 01:33, robert bristow-johnsonr...@audioimagination.com wrote: but you cannot define your current output sample in terms of the current output sample. But that, with all due respect, is what has been done for quite a while. it's

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread Ezra Buchla
i hope it's ok if i sum up the main themes here with background links, as i understand it. the thread is just such a mess... here is the state variable filter from hal chamberlin 1985 or so: http://t.co/SVJp7iAgqb pierre dutilleux wrote up a nice discretized and tuned version in dafx 1998:

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread Ross Bencina
Hi Ezra, A few comments: On 11/11/2013 3:19 PM, Ezra Buchla wrote: there seems to be some concern about distortion introduced by the trapezoidal integration. i've tried the algo in both fixed 32 ands float, and it seems to sound and look ok to but i have not done a proper analysis either

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-10 Thread Ross Bencina
On 11/11/2013 12:21 PM, robert bristow-johnson wrote: but you cannot define your current output sample in terms of the current output sample. But that, with all due respect, is what has been done for quite a while. it's been reported or *reputed* to be done for quite a while. but when the

Re: [music-dsp] R: R: Trapezoidal integrated optimised SVF v2

2013-11-09 Thread Andrew Simper
On 9 November 2013 22:21, Marco Lo Monaco marco.lomon...@teletu.it wrote: Hi Marco, First up I want to thank you for your considered and useful observations Marco, I appreciate where you are coming from and how you can clearly communicate your ideas. This makes it possible for me to reply to