On Sat, May 26, 2007 at 06:02:35PM +0200, nescivi wrote: > On Saturday 26 May 2007 16:09:35 Andrew Gaydenko wrote: > > > 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.
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 ! _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev
