Bob Cain wrote:


Ethan Winer wrote:

I've played quite a bit with this business of pulling transients out
front


of the stuff they stimulate via group delay manipulation.

How have you done that? Hardware? Software?


Software. Matlab for making allpass filters with tailored group delay
and Adobe Audition to apply them. You can generate the allpass by
creating a group delay curve as a function of frequency, taking the
discrete derivative of it,

Oops. Make that the discrete integral.

taking the IFFT of that with a flat magnitude
function and doing some judicious windowing. That yields an FIR which
can be convolved with material in Audition (Cool Edit Pro back when I
was playing with this.)


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein