If you want to check why it works I uploaded a section of a
homework I had to do on the subject:
http://www.friendlyvirus.org/files/time%20reverse%20IR.zip
Basically what is going on is that if you have a filter S with
amplitude of the frequency response equal to 1 (|H(e^itheta)|=1)
then the time reversed impulse response of this filter yealds the
inverse of your original filter, that is, another filter S' such
that h*h' = Id (* = convolution, h impulse response of S, h' of S').
Then you can take the system you want to measure, G, with IR h_g
and do h*h_g*h'= h_g. if you use a sine sweep then the improvement
you are getting over just using an impulse is that you are avering
the errors due to all your equipement and the signals not being
perfect over a larger amount of time, thus getting a better
measurement.
cheers,
Miguel
Sciss escreveu:
ah really..... i didn't know, i just tried that, works great,
thanks!! i did use a very annoying technique with repeated clicks
before, this is _much_ easier!!
--
Miguel Negrão // ZLB
http://www.friendlyvirus.org/artists/zlb/
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