9 Oct
2008
9 Oct
'08
5:57 p.m.
Hello,
Few days ago I came up with an idea about an open source guitar
modeling software. But because of my lack of knowledge on both
electronics and audio engineering I couldn't decide if it worths
something. Here it is directly quoted from linuxmusicians.com
**QUOTE**
Okay! My idea is to use GNUCAP or SPICE to process the guitar signal.
These are the top open source analog circuit simulators that are also
widely used in the industry for general purpose circuit simulation
(not audio specific). You basically feed them the schematics of a
circuit and wait for magic to happen. I believe they may be hacked to
accept a guitar signal as a varying voltage source. Now there are 3
questions: Is that even possible? If yes, is it possible in
real-time? If yes, would results be satisfying (quality and accuracy
wise)
**END_QUOTE**
thanks very much, and sorry in advance if I missed something obvious
and this is a completely useless idea
9 Oct
9 Oct
6:09 p.m.
On Thu, 2008-10-09 at 22:59 +0300, almbfsek(a)turk.net wrote:
Is that even possible? If yes, is it possible in
real-time?
the last time somebody had this idea, i seem to recall that someone who
new those programs quite well said "yes its possible, but absolutely not
in real time".
--p
6:18 p.m.
On Thu, Oct 09, 2008 at 10:59:16PM +0300, almbfsek(a)turk.net wrote:
Now there are 3 questions:
Is that even possible?
Yes.
If yes, is it possible in real-time?
Maybe. But I guess the safest answer is 'no'.
If yes, would results be satisfying (quality and
accuracy
wise)
Probably it would.
But it's like trying to destroy a fly with a nuclear
bomb. The fly won't survive, but it's a bit over the
top.
There's no need to exactly simulate a circuit.
What you want is to simulate the effect the circuit
has on your sound, at that can probably be done with
1/1000 or less of the effort it takes to do a full
circuit simulation. The key is to understand what
the circuit is doing.
Ciao,
--
FA
Follie! Follie! Delirio vano e' questo!
7:07 p.m.
almbfsek(a)turk.net wrote:
Few days ago I came up with an idea about an open
source guitar
modeling software. But because of my lack of knowledge on both
electronics and audio engineering I couldn't decide if it worths
something. Here it is directly quoted from linuxmusicians.com
tinfo/linux-audio-dev
... snipped for brevity...
I've been researching putting together my own guitar amp sim (among many
other things). Of course, this is amongst many other things, as my mind
tends to scatter while working on several projects simultaneously and
incrementally, but that's a whole other issue.
I've found a few papers here and there on wave digital filters (WDFs)
and "lumped modeling", which appears to be the closest you can get to
modeling circuits (including non-linear behavior) right in a computer
and have it be reasonably efficient, too. These techniques are also used
for modeling physical systems within a computer (piano hammers are a
common example).
I was going to try to create a WDF library for Faust (a functional DSP
programming language that compiles to efficient C++) so I could play
around with a few ideas. I can't guarantee when I'll be done, though, as
I have a malfunctioning sound card that I can't replace for a while.
Here's a link to a paper about modeling a guitar amp using WDFs:
http://lib.tkk.fi/Diss/2008/isbn9789512292431/article4.pdf
And here are some sound file examples:
http://www.acoustics.hut.fi/publications/papers/icassp-wdftube/
As for how to implement WDFs and connect them together, I'm still trying
to figure that out myself. The definitive paper on the subject costs $30
from AES.
If you'd like to compare notes and ideas, please feel free to contact me
off-list.
-- Darren
6335
days inactive
6335
days old
linux-audio-dev@lists.linuxaudio.org
3 comments
4 participants
participants (4)
-
almbfsek＠turk.net -
Darren Landrum -
Fons Adriaensen -
Paul Davis