I've been working for a couple of years now on a synthetic binaural system. My first reason was to be able to interpolate cleanly between HRTFs, which I think is working well. I can move sounds around at silly speeds and get smooth responses. And it all sounds good to me, but of course, I may have just built my own, custom HRTFs.
The second goal is to parameterize it for different people. I control the dozen or more filters and delay with three parameters, head size that controls ITD, torso size or the cutoff above which there are ILDs, and a frequency scaling of all the other stuff, which is mostly the stuff above 4K, which I'm calling ear size. So far my experience is that the delay definitely makes a difference. The ILDs help, but changing the cutoff frequency is not as dramatic as I might have thought. The top stuff, I assume mostly pinnae effects, is what interests me right now. I don't find that scaling the frequencies up and down makes much difference, but, I wonder if having some notches and peaks there doesn't help anyway. Consider a sound in front. When you turn your head to disambiguate front/back, these notches and peaks sweep up in one ear and down in the other. A sound in the rear would get very little of this effect. Could our ears not be very sensitive to the sweep, even if we could not reliably tell one static state from the other? Here's a page showing graphics of my results so far. I'll post a better link to my google cardboard demo when I manage to get it up to the app store, but here's an .apk file for those of you who can get that to your phone on your own. http://www.vvaudio.com/synthbinaural http://www.vvaudio.com/sites/vvaudio7/files/VVUnityDemo.apk_.zip David McGriffy VVAudio On Sun, Dec 13, 2015 at 9:57 AM, Augustine Leudar <augustineleu...@gmail.com > wrote: > Thanks for clarifying Bo-Erik > > On 13 December 2015 at 15:42, Bo-Erik Sandholm <bosses...@gmail.com> > wrote: > > > Tried to formulate it like this exactly: > > Above 4 kHz individual hrtf's are very difficult to create. > > Generic HRTF transformation can (should) be used for 4kHz and upwards. > > > > Best Regards > > Bo-Erik > > On Dec 12, 2015 10:19 PM, "Stefan Schreiber" <st...@mail.telepac.pt> > > wrote: > > > > > Bo-Erik Sandholm wrote: > > > > > > Sadly this info is not published as far as I know, > > >> > > >> I have it from Ingvar Öhman > http://lmgtfy.com/?q=ingvar+%C3%B6hman&l=1 > > >> who > > >> had a research company for researching how the human hearing work > > together > > >> with the 2 loudspeaker stereo system. > > >> > > >> He did a demo recording showing how you could do stereo with height > > mixing > > >> For The Swedish Radio (Sveriges Radio) a long time ago with very low > > >> interest from them. > > >> > > >> > > > > > > > > > Stereo with height - (reflecting) > > > > > > This is a truly audiophile approach... ;-) > > > > > > But I don't want to be too ironic: interesting anyway. And such > > techniques > > > could be applied to 5.1 etc., as well. (What the Mpeg seems to offer > as > > > "tool" in the case of Mpeg-H 3DA, BTW. ) > > > > > > Stefan > > > > > > P.S.: > > > > > > I have talked to him about this, He has never been much of a publisher > > >> other than in discussion forums in swedish. > > >> > > >> > > > A pity?! > > > > > > And of course is using it in his business as consultanta and designer, > > >> > > >> So I have only the principal description that individual HRTF's over > > 4kHz > > >> makes things worse for 90% of the population and that is frequency > bands > > >> that for the majority of people gives an impression of height when > > raised > > >> in amplitude. > > >> > > >> > > > > > > Must read: > > > > > > "... that < generic > HRTF's over 4kHz makes things worse for 90% of > the > > > population" ? > > > > > > We must keep precise, in this context. > > > > > > > > > > > > _______________________________________________ > > > Sursound mailing list > > > Sursound@music.vt.edu > > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > here, > > > edit account or options, view archives and so on. > > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151213/92d34a6f/attachment.html > > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > > edit account or options, view archives and so on. > > > > > > -- > www.augustineleudar.com > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151213/e9a9b906/attachment.html > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... 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