Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Urs Heckmann
On 20.06.2014, at 17:37, robert bristow-johnson wrote: > On 6/20/14 10:57 AM, Andrew Simper wrote: >> On 20 June 2014 17:11, Tim Goetze wrote: >> >>> [Andrew Simper] On 18 June 2014 21:01, Tim Goetze wrote: > I absolutely agree that this looks to be the most promising approach >

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Andrew Simper
On 20 June 2014 23:37, robert bristow-johnson wrote: > well, Kirchoff's laws apply to either linear or non-linear. but the > methods we know as "node-voltage" (what i prefer) or "loop-current" do > *not* work with non-linear. these circuits (that we apply the node-voltage > method to) have depe

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Rich Breen
Just as a data point; Been measuring and dealing with converter and DSP throughput latency in the studio since the first digital machines in the early '80's; my own experience is that anything above 2 or 3 msec of throughput latency starts to become an issue for professional musicians; 5 msec be

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Ross Bencina
Hi Rich, On 22/06/2014 1:09 AM, Rich Breen wrote: Just as a data point; Been measuring and dealing with converter and DSP throughput latency in the studio since the first digital machines in the early '80's; Out of interest, what is your latency measurement method of choice? my own experien

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Phil Burk
On 6/21/14, 8:09 AM, Rich Breen wrote: 5 msec becomes very noticable on headphones, and above 6 msec is not usable. Note that the speed of sound in air is roughly 1125 feet/second. So if a guitar player is more than 7 feet from their amp then they will have more than 6 msec of latency. Fo

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Nigel Redmon
I agree, Phil, that the “6 msec is not usable” is not a realistic statement. First, the brain anticipates. Humans are incredible good at throwing things, for instance. (In a few minutes, I’m heading out to play basketball and drain some “threes”.) And the brain needs to tell the hand to release

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Nigel Redmon
PS—I actually took Rich’s “6ms is unusable” to mean “unacceptable”, which I do agree with. For instance, when I had a Korg Trinity, I liked the keyboard action (61 key) very much in general, but I would *never* enable the combi mode—it was so slow that it was unacceptable to me, even for the far

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread robert bristow-johnson
On 6/21/14 7:21 AM, Urs Heckmann wrote: On 20.06.2014, at 17:37, robert bristow-johnson wrote: On 6/20/14 10:57 AM, Andrew Simper wrote: On 20 June 2014 17:11, Tim Goetze wrote: [Andrew Simper] On 18 June 2014 21:01, Tim Goetze wrote: I absolutely agree that this looks to be the most

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread robert bristow-johnson
On 6/21/14 10:45 AM, Andrew Simper wrote: On 20 June 2014 23:37, robert bristow-johnson wrote: well, Kirchoff's laws apply to either linear or non-linear. but the methods we know as "node-voltage" (what i prefer) or "loop-current" do *not* work with non-linear. these circuits (that we apply t

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Andrew Simper
> the underlying physics: Kirchoff's current law, Kirchoff's voltage law, and > the volt-amp characteristics of each element *is* applicable to any "lumped > element" circuit, one with any combination of linear or nonlinear elements > or memoryless or non-memoryless elements. but the Loop-current

Re: [music-dsp] Simulating Valve Amps

2014-06-21 Thread Andrew Simper
> um, it's a semantic thing that i just wrote about in response to Urs. i > don't use the term myself, but i am defining "nodal analysis" the way i see > virtually all other lit doing it. when spice is modeling non-linear > circuits, it is using Kirchoff's current law on every node, Kirchoff's >