27 Sep
2009
27 Sep
'09
8:23 a.m.
On Sun, Sep 27, 2009 at 12:00:42PM +0200, Jörn Nettingsmeier wrote:
nothing prevents you from using aliki to capture some
old fender amps.
but you should take into account that it only makes sense for the linear
operation, i.e. the tone color of the clean amp and speakers. as soon as
distortion sets in, simple IR will no longer cut it.
But it *is* possible to both measure and recreate non-
linear systems using convolution. If your input signal
is x(t), you need separate IRs to convolve with x, x^2,
x^3, etc. and sum the results. Finding the required IRs
from the measurements requires some mathematical trickery.
But the results can be very convincing, for example a
'telephone' filter implemented this way sounds like the
real thing, unlike the simple bandpass + peaks + dips
often used to do this. Similar techniques can be used
to simulate vintage amps etc.
Ciao,
--
FA
Io lo dico sempre: l'Italia è troppo stretta e lunga.