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

2013-11-08 Thread Urs Heckmann
On 08.11.2013, at 10:21, Vadim Zavalishin vadim.zavalis...@native-instruments.de wrote: Hi Urs! I don't believe this. So, you think that The art of VA filter design book doesn't cover it? Regards, Vadim Hi Vadim, No offense meant, I wasn't aware that your book was considered a

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

2013-11-10 Thread Urs Heckmann
On 09.11.2013, at 01:57, Tom Duffy tdu...@tascam.com wrote: To paraphrase, all are good enough if the frequency is low ( pi/3); Simpsons is the best, but blows up above 0.8 pi Note that Andys approach uses trapezoidal integrators just as that - integrators. While the whole structure of the

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

2013-11-10 Thread Urs Heckmann
signal processing can chat. So I encourage you to share your results here! I'm sorry there has been unpleasantness on the list recently. best, douglas On 11/10/13 10:00 AM, Urs Heckmann wrote: We had planned to write a paper about our numerical method for the non-linear case

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] Trapezoidal integrated optimised SVF v2

2013-11-11 Thread Urs Heckmann
On 11.11.2013, at 02:21, robert bristow-johnson r...@audioimagination.com wrote: 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

Re: [music-dsp] Implicit integration is an important term, ZDF is not

2013-11-13 Thread Urs Heckmann
On 13.11.2013, at 07:50, Andrew Simper a...@cytomic.com wrote: I hope this clears things up and exposes ZDF as a confusing and pointless marketing catch phrase. It's not pointless for marketing in the sense that instantaneous feedback is much easier to explain than implicit integration. Users

Re: [music-dsp] Implicit integration is an important term, ZDF is not

2013-11-14 Thread Urs Heckmann
difference methods for nonlinear ODE models of analog circuits? Max On 14 November 2013 11:26, Urs Heckmann u...@u-he.com wrote: My point is, It's not the fault of those who use the term in a correct way that some others have used it in a confusing way. That however doesn't justify

Re: [music-dsp] Implicit integration is an important term, ZDF is not

2013-11-16 Thread Urs Heckmann
Well, the word delay has been used in literature for 30+ years, to explain z^-1 sections in algorithmic implementations. I wonder what RBJ would have called the terms z^-1 or z^-2 had he explained them in his cookbook. What would you call them? I agree though that one should not confuse model

Re: [music-dsp] Simulating Valve Amps

2014-06-20 Thread Urs Heckmann
On 20.06.2014, at 11:11, Tim Goetze t...@quitte.de wrote: I mistakenly thought you were proposing nodal analysis including also the nonlinear aspects of the circuit including valves and output transformer (which without being too familiar with the method I believe to lead to a system of

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Urs Heckmann
On 20.06.2014, at 17:37, robert bristow-johnson r...@audioimagination.com wrote: On 6/20/14 10:57 AM, Andrew Simper wrote: On 20 June 2014 17:11, Tim Goetzet...@quitte.de wrote: [Andrew Simper] On 18 June 2014 21:01, Tim Goetzet...@quitte.de wrote: I absolutely agree that this looks to

Re: [music-dsp] Simulating Valve Amps

2014-06-22 Thread Urs Heckmann
Dear Robert, On 22.06.2014, at 04:19, robert bristow-johnson r...@audioimagination.com wrote: it's possible that this is only a semantic issue. Thanks for clearing this up. It's indeed a semantic issue (use of the term nodal analysis), which then leads to further misunderstandings. What we

Re: [music-dsp] Simulating Valve Amps

2014-06-22 Thread Urs Heckmann
On 22.06.2014, at 19:04, robert bristow-johnson r...@audioimagination.com wrote: i don't think i agree with the following claim, Urs, ... but no matter what method of integration we use, we always end up with the same set of equations to solve for the actual step. different methods of

Re: [music-dsp] Simulating Valve Amps

2014-06-22 Thread Urs Heckmann
On 22.06.2014, at 20:24, robert bristow-johnson r...@audioimagination.com wrote: On 6/22/14 1:20 PM, Urs Heckmann wrote: On 22.06.2014, at 19:04, robert bristow-johnsonr...@audioimagination.com wrote: 2. Get the computer to crunch numbers by iteratively predicting, evaluating

Re: [music-dsp] Simulating Valve Amps

2014-06-23 Thread Urs Heckmann
On 23.06.2014, at 06:37, robert bristow-johnson r...@audioimagination.com wrote: the other thing Urs brought up for discussion is an iterative and recursive process that converges on a result value, given an input. i am saying that this can be rolled out into a non-recursive equivalent,

Re: [music-dsp] Simulating Valve Amps

2014-06-23 Thread Urs Heckmann
On 23.06.2014, at 19:18, robert bristow-johnson r...@audioimagination.com wrote: it *is* precisely equivalent to the example you were describing with one more iteration than you were saying was necessary. Now I'm really angry I wasted so much time. An example is just that, an example. I

Re: [music-dsp] Simulating Valve Amps

2014-06-24 Thread Urs Heckmann
On 24.06.2014, at 10:16, Stefan Stenzel stefan.sten...@waldorfmusic.de wrote: On 24 Jun 2014, at 0:37 , Urs Heckmann u...@u-he.com wrote: (Odyssee?) - fully analogue synths. That's currently the only way to get something decent in hardware. Proper digital models seem to only make

Re: [music-dsp] [admin] Re: Simulating Valve Amps

2014-06-24 Thread Urs Heckmann
You're right. I've been worked up ever since people post those silly and ignorant stabs like this: On 09.04.2014, at 19:12, robert bristow-johnson r...@audioimagination.com wrote: if there is feedback, there must be at least one sample of delay, despite claims of zero-delay feedback i have