Hi Stefan,
On 07 Jun 2016, at 04:35, Stefan Schreiber <st...@mail.telepac.pt<mailto:st...@mail.telepac.pt>> wrote: Politis Archontis wrote: But instead of combining all microphones to generate the binaural directivities (as in ambisonics), it interpolates only between the two adjacent microphones that should be closest to the listener’s ears. Otherwise, it does not capture pinna cues or cues from a non-spherical/assymetrical head. Any source for this explanation? I actually dare to question your view... How will you receive any binaural cues via interpolation between two relatively closely spaced omni mikes (fixed on a sphere)? As you even write, this doesn't seem to give any head and pinna cues. (It's called MTB. So I guess they would aim to provide several binaural perspectives, including head and pinna cues?) The source is the AES paper describing the method: Algazi, R. V., Duda, R. O., & Thompson, D. M. (2004). Motion-Tracked Binaural Sound. In 116th AES Convention. Berlin, Germany. It does give head-related cues, that of a spherical head without pinna. If you put an omni on a rigid sphere, it is not an omni anymore, it has a frequency-dependent directionality, if you put two of them at opposite sides, they have opposite directionalities and introduce inter-channel level differences. Depending on the size of the sphere, the two signals have a direction-dependent phase-difference too. If the size of the sphere is approximately the size of a head, then you can assume that the level and time differences are close to the binaural ones. This is the infamous spherical head model, and its ITDs and ILDs are known analytically. It captures the cues for lateralization, but not for a pinna (that it doesn’t have) or for head assymetries. If instead of two omnis, you put many of them on the horizontal plane, then you can track the listener’s head yaw rotation and use the two omnis that are closer to their ears - or interpolate for a smoother transition. That’s what Algazi and Duda are doing in their paper, and they compare various interpolation schemes. Regards, Archontis -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160607/4d3112ff/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.
