Hi, guys!

I'm trying to work on some binaural spacialization. And I'm aware there's already some externals like vbap~ or space~, but they don't quite work for me. However I came across the CW_binaural~ which completely kicks ass. But I'm trying to work this on myself without any use of externals.

So, theory dictates that convolution of any sound with an HRIR converts the sound as if it was being heard from the HRIR source location. But I'm not getting it completely right. btw, im using the HRIR's from the listen database (http://recherche.ircam.fr/equipes/salles/listen/download.html)

let's say i've got an impulse response taken at the right side 45 degress front, after convolution however the left ear sounds with almost the same amplitude (a bit diminished, though). It's true, the left ear is catching some of the right side burst, but it's not quite relating to it's REAL amplitude.

I attach an image of the patch. The fft convolution is based on the Johaness book patch.

Does anyone has any comments on this?

http://www.pdpatchrepo.info/hurleur/Picture_94.png

Post your patch please, an image makes so little sound.

Katja

Hi, katjav

sure thing, I include some test HRIR.

http://www.pdpatchrepo.info/hurleur/patch.zip

oh rats.. I'm afraid I must have terrible hearing. But.., I'm beginning to think it sounds as it probably should. I'm comparing the amplitudes in Audacity and it makes sense. shame on me...

Hi Laszlo, the IR's are 8192 samples and your convolution patch does blocks of 1024 samples. That would be ok if you do partitioned convolution, but the convolution patch is not so advanced. Even if you set block size 8192, it is not yet complete convolution. From the filter (which is supposed to be on the right inlet, not the left) only the amplitudes are used. This would be sufficient in case of a zero-phase filter, but the spatialization IR's are of course not zero-phase filters.

To do this completely without externals, requires a bit more knowledge of convolution theory. There was a related thread a while ago:

http://puredata.hurleur.com/sujet-6682-convolution-reverb-rjdj

Katja

Hi, Katja.

I guess I'll have to keep on reading.
Naturally, I barely have an understanding on convolution, let alone filters. It's too goddamn difficult for me. I suck at all that math and complex realm stuff.

I'll have to isolate myself for like two months in order to put all that under my belt

Thanks for the tip, Katja. I've been reading your page, it's very helpful. You do some amazing things.