That reminds me - what's the highest order ambisonic-to-binaural encoding achieved so far, in combination with head-tracking (and with what latency)? - anyone know? Cheers ppl
Dr. Peter Lennox Senior Lecturer in Perception College of Arts University of Derby, UK e: p.len...@derby.ac.uk t: 01332 593155 https://derby.academia.edu/peterlennox https://www.researchgate.net/profile/Peter_Lennox -----Original Message----- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Dave Hunt Sent: 05 June 2016 18:14 To: sursound@music.vt.edu Subject: Re: [Sursound] Using Ambisonic for a live streaming VR project Hi, It is hardly surprising that "I hear directional information and head tracking effects, but have never experienced the externalization and verisimilitude that direct dummy head or Algazi and Duda's motion- tracked binaural recordings can produce." Even software direct binaural encoding seems more 'accurate' than B- Format ambisonics recoded to binaural. Then Algazi and Duda's system uses binaural recordings, and they know what they're doing. Decorrelation, and software reverb, can help with a sense of externalisation, though you can go too far. Ciao, Dave Hunt > From: Aaron Heller <hel...@ai.sri.com> > Date: 4 June 2016 20:53:09 BDT > To: Surround Sound discussion group <sursound@music.vt.edu> > Subject: Re: [Sursound] Using Ambisonic for a live streaming VR > project > > > My experience with FOA-to-binaural rendering is pretty much the same > as > what Acrhontis says. I hear directional information and head > tracking > effects, but have never experienced the externalization and > verisimilitude that direct dummy head or Algazi and Duda.'s > motion-tracked binaural recordings can produce. > > Aaron (hel...@ai.sri.com) > Menlo Park, CA > > On Sat, Jun 4, 2016 at 2:31 AM, Politis Archontis < > archontis.poli...@aalto.fi> wrote: > >> Hi Jörn, >> >> On 03 Jun 2016, at 15:27, Jörn Nettingsmeier >> <netti...@stackingdwarves.net <mailto:netti...@stackingdwarves.net>> >> wrote: >> >> Note however that while the quality of first-order to binaural is >> quite good because the listener is by definition always in the sweet >> spot, first-order over speakers can be difficult for multiple >> listeners when they're far outside the center. >> >> >> This is by no means meant to provoke, but I have never managed to >> hear a convincing B-format to binaural rendering, or to produce one >> myself. Could you possibly share some info on the decoding approach >> that you used that results in a good example? >> >> In my experience, no matter how much tweaking in the decoding, there >> is severe localization blur, due to the large inherent spreading of >> directional sounds, and low envelopment due to the wrong (high) >> coherence in the binaural signals with reverberant sound, compared to >> the actual binaural coherence. And there is also serious colouration, >> with a loss of high-frequencies, that seems direction-dependent. The >> fact that everything is on the ideal sweet spot under free-field >> conditions doesn't seem to improve much, it actually seems to do more >> harm (I believe that a small amount of natural added decorrelation >> from a room and tiny misalignments from speakers etc. seem to improve >> binaural coherence and the perceptual quality somewhat of loudspeaker >> B-format reproduction). >> >> Listening to a binaural rendering from a real B-format recording is >> not so bad, there is no reference for comparison, but for VR the >> difference I've heard between using directly HRTFs and B-format >> rendering is huge. >> And as >> many of these applications rely on sharp directional rendering with >> accurate localization of multiple sound events, traditional B-format >> decoding seems unsuitable to me. The performance improves somewhat >> with 2nd-order rendering, and significantly with 3rd and 4th-order >> rendering. >> Also it improves dramatically using plain B-format with a well- >> implemented parametric active decoder, such as HARPEX or DirAC. >> So my guidelines for VR till now have been, >> a) if bandwidth is not an issue go for HOA rendering (at least 3rd- >> order), >> b) if it is an issue, like the streaming application of the OP, >> stream B-format and use an active decoder at the client side. >> >> But I'd like to hear many opinions on this too, and any counter >> examples! >> >> Regards, >> Archontis Politis -------------- next part -------------- An HTML attachment was scrubbed... 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