Re: 3D Audio -improving HRTF filtering (sherin tech )


Subject: Re: 3D Audio -improving HRTF filtering
From:    sherin tech  <sherin.tech@xxxxxxxx>
Date:    Wed, 5 Apr 2006 19:11:41 +0530

Hi piotr, thanks you very much for the info .. >"You should zero-pad the signal to the 1024+128 to avoid time aliasing." I wasn't doing this ... now its working .. On 4/5/06, Piotr Majdak <piotr@xxxxxxxx> wrote: > Hi Sherin, > > sherin tech wrote: > > > the steps involved in my new implemantation are ... > > > > 1) take 1024 number of samples. > > 2) Window those 1024 samples. (for this I am now using kaiser window of beta=16) > > 3) Take 1024 point FFT the input > > You should zero-pad the signal to the 1024+128 to avoid time aliasing. > > > 4) Zero pad the 128 point HRTF filter to make it 1024 point. > > Then you must zero-pad the HRTF to 1024+128. > > > 5) Take 1024 FFT of HRTF Left ans Right data. > > 6) Multiply the spectrum in frequency domain. > > 7) Take 1024 point IFFT of the resultant spectrum. > > 8) Do a 75 % overlap and add. > > The perfect reconstruction is given only if the resynthesis window is dual to > the analysis window. I don't know it for the kaiser window, but you can try to > change the resynthesis overlap factor in such a way, that the square sum of the > kaiser windows is constant. This should give you an almost perfect resynthesis, > I think... > > br, Piotr Majdak > > > -- > Piotr Majdak > Institut für Schallforschung > Österreichische Akademie der Wissenschaften > Reichsratsstr. 17 > A-1010 Wien > Tel.: +43-1-4277-29511 > Fax: +43-1-4277-9296 > E-Mail: piotr@xxxxxxxx > WWW: http://www.kfs.oeaw.ac.at > > >


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Electrical Engineering Dept., Columbia University