Professor Edgar Choueiri on 3D Audio

Stephen Mejias, Jana Dagdagan and I made the trip to Princeton, NJ to the homes of the 3D Audio and Applied Acoustics (3D3A) Laboratory at Princeton University and Professor Choueiri where we listened to all things 3D audio. Following are 3 videos taken from one long video of the Professor explaining what he does in the lab and how that applies to our homes (and more).

I reviewed the BACCH4Mac Audiophile Edition 3D Audio Playback System which is an outgrowth of the Lab at Princeton.


insertusernamehere's picture

... an unfortunately common circumstance in my case.

But both in this set of videos and in another video you (AStream) posted some time ago, Professor Choueiri demonstrates, with some pride, the anechoic chambers that he uses to "measure your HRTF") (in the earlier video, it was a very elaborate, full-on anechoic chamber with a multi-speaker array, in this one, it seems more like a quasi-anechoic chamber with a set of Genelecs). In either case, it seems like it takes a lot of specialized gear and room treatment, etc. to get the HRTF measurement right.

HOWEVER, the BAACH product(s) playback through your own speakers, in your own space into your ears using (presumably) high-quality in-ear mics.

So, my confusion is: what are you getting when you use your own speakers/room? Presumably not the HRTF, but the HRTF + your speaker/room? Would it be better for modeling purposes if you instead measured in an anechoic chamber? Or is it better for playback purposes that you use your own room/speakers in order to allow for those variables to be incorporated into the BAACH filters? I guess what I am asking is: is it "better" (from an end-user perspective) to get an accurate model of your head/HRTF (anechoic chamber), or of your head in your own space with your own speakers (BAACH within your playback chain); would I be better off going to Princeton to get measured or better off bringing Princeton (via a BAACH machine) to me? Thanks!

jgazal's picture

To reproduce binaural recordings through loudspeakers one need a crosstalk cancellation algorithm and Professor Choueiri Bacch algorithm not only avoids coloration that old algorithm used to have but also measures an binaural room impulse response to relieve head movement range. You can also measure a BRIR in different spots of your listening room. I admire Dr. Choueiri. I wish I had just a little bit of his intelligence and knowledge.