26 May
2007
26 May
'07
10:56 a.m.
Hi!
Is there some kind of JACK-ready tool to draw a transfer function (db/db)
of a given chain (last one is something having JACK input and output ports)?
Of course, such tool's opportunity to change a frequency of excitation is my
main dream :-)
Andrew Gaydenko
26 May
26 May
11:40 a.m.
Es geschah am Saturday, 26. May 2007 14:57 als Andrew Gaydenko schrieb:
Is there some kind of JACK-ready tool to draw a
transfer function (db/db)
of a given chain (last one is something having JACK input and output
ports)?
Ehm ... no?
And btw transfer functions are only for LTI systems, so such a tool wont work
with arbitrary JACK chains. Or do you just want to use it for chains of
simple filters and effects? Ah, and such a tool has to be connected to both
ends of the chain, to be able to send an impulse through the chain.
CU
Christian
12:09 p.m.
======= On Saturday 26 May 2007, you wrote: =======
Es geschah am Saturday, 26. May 2007 14:57 als Andrew
Gaydenko schrieb:
Christian,
You are right, I'm just interested in what does this or that filter/effect do
(limiters,
compressors, "tube-nizers" and so on - both software and hardware). Of course, I
see,
say, attack/release times may be beyond such simple db/db viewer. At any case
"pseudo-static" mode is interesting also. I imagine such viewer having (besides
of
excitation frequency control) 'min level', 'max level' and 'excitation
time' controls.
Last one may be rather long (say, up to 20-60 sec).
Andrew
Is there some kind of JACK-ready tool to draw a
transfer function (db/db)
of a given chain (last one is something having JACK input and output
ports)?
Ehm ... no?
And btw transfer functions are only for LTI systems, so such a tool wont work
with arbitrary JACK chains. Or do you just want to use it for chains of
simple filters and effects? Ah, and such a tool has to be connected to both
ends of the chain, to be able to send an impulse through the chain.
CU
Christian 
2:03 p.m.
Hiho,
On Saturday 26 May 2007 16:09:35 Andrew Gaydenko wrote:
I guess one could abuse Aliki for it. Instead of measuring the impulse
response of a room, just measure it of your JACK effect chain.
sincerely,
Marije
Es geschah am
Saturday, 26. May 2007 14:57 als Andrew Gaydenko schrieb:
Christian,
You are right, I'm just interested in what does this or that filter/effect
do (limiters, compressors, "tube-nizers" and so on - both software and
hardware). Of course, I see, say, attack/release times may be beyond such
simple db/db viewer. At any case "pseudo-static" mode is interesting also.
I imagine such viewer having (besides of excitation frequency control) 'min
level', 'max level' and 'excitation time' controls. Last one may be
rather
long (say, up to 20-60 sec). Is there some kind of JACK-ready tool to draw a
transfer function
(db/db) of a given chain (last one is something having JACK input and
output ports)?
Ehm ... no?
And btw transfer functions are only for LTI systems, so such a tool wont
work with arbitrary JACK chains. Or do you just want to use it for chains
of simple filters and effects? Ah, and such a tool has to be connected to
both ends of the chain, to be able to send an impulse through the chain.
CU
Christian 
2:44 p.m.
On Sat, May 26, 2007 at 06:02:35PM +0200, nescivi wrote:
On Saturday 26 May 2007 16:09:35 Andrew Gaydenko
wrote:
The assumption when emulating a system via its IR is normally that it is
linear and time-invariant. But it is possible to use the technique if these
conditions are not satisfied as well.
For non-linear systems there is a method based on Volterra series expansion.
To emulate such a system you convolve not only the input f(t) with the
impulse response i_1 (t), but also f(t)^2 with i_2(t), f(t)^3 with i_3(t)
and so on. Can't remember from the top of my head how to find the i_n(t),
but it's possible. Farina has a paper on it.
--
FA
Follie! Follie! Delirio vano รจ questo !
You are right, I'm just interested in what
does this or that filter/effect
do (limiters, compressors, "tube-nizers" and so on - both software and
hardware). Of course, I see, say, attack/release times may be beyond such
simple db/db viewer. At any case "pseudo-static" mode is interesting also.
I imagine such viewer having (besides of excitation frequency control) 'min
level', 'max level' and 'excitation time' controls. Last one may be
rather
long (say, up to 20-60 sec).
I guess one could abuse Aliki for it. Instead of measuring the impulse
response of a room, just measure it of your JACK effect chain. 
31 May
31 May
7:14 p.m.
Hello,
Is there some kind of JACK-ready tool to draw a transfer function (db/db)
of a given chain (last one is something having JACK input and output ports)?
Of course, such tool's opportunity to change a frequency of excitation is my
main dream :-)
I dont know if I got it right but you can draw a transfer/ waveshaping/
compression whateverfunction easily/ graphicly with pure data.
Cheers,
Malte
--
Malte Steiner
media art + development
-www.block4.com-
next concert:
16.6. Notstandskomitee Repsoldstrassenfest Hamburg
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linux-audio-dev@lists.linuxaudio.org
5 comments
5 participants
participants (5)
-
Andrew Gaydenko -
Christian Schoenebeck -
Fons Adriaensen -
Malte Steiner -
nescivi