Re: [sc-users] Deconvolution on Mac OS X

[Miguel Negrao <miguel.negrao@xxxxxxxxxxxxxxxxx>]

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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