Thanks for the list Markus,
I read the conclusions and abstracts for these papers and skimmed through
them - I am also quite busy ! However none of them seem to investigate or
suggest that the curvature of the wavefront and this curvatures interaction
with pinna folds is a potential distance and size cue in the nearfiled.  I
did find this though which mentions it but doesnt really investigate (or
reference a source unfortunately)  :

https://pdfs.semanticscholar.org/0664/8964b53ac8f812b0068088caa4838c3ba7ce.pdf

On 24 January 2018 at 14:35, Markus Noisternig (IRCAM) <
markus.noister...@ircam.fr> wrote:

> Dear All,
>
> Here are some references:
>
> Brungart and Rabinowitz [1] showed that HRTF vary significantly for
> sources in the proximity region (i.e. at distances less than 1m from the
> head).
> Lentz et al. [2] perceptually evaluated measured HRTFs at different
> distances from the head, showing limits of noticeable differences between
> near-field and far-field HRTFs.
> Romblom and Cook [3] proposed near-field compensation filters.
> Duraiswami et al. [4], Zhang et al. [5], and Pollow et al. [6] compute
> HRTFs for arbitrary field points using spherical harmonics decomposition
> (as an extension of the work of Evans et al. [7]).
> Duda and Martens [8] evaluated simulation results on a spherical head model
>
> Have fun reading!
>
> Very best,
>
> Markus
>
> [1] D.S.Brungart,W.M.Rabinowitz:Auditorylocalizationof nearby sources.
> head-related transfer functions. J. Acoust. Soc. Am. 106 (1999) 1465–1479.
> [2] T. Lentz, I. Assenmacher, M. Vorländer, T. Kuhlen: Precise
> near-to-head acoustics with binaural synthesis. Journal of Virtual Reality
> and Broadcasting 3 (2006).
> [3] D. Romblom, B. Cook: Near-field compensation for hrtf processing.
> 125th Conv. Audio Eng. Soc., San Francisco, USA, 2008, no. 7611.
> [4 ]R. Duraiswami, D. N. Zotkin, N. A. Gumerov: Interpola- tion and range
> extrapolation of HRTFs. IEEE ICASSP, Montreal, Canada, 2004, 45–48.
> [5] W. Zhang, T. D. Abhayapala, R. A. Kennedy, R. Du- raiswami: Modal
> expansion of HRTFs: Continuous repre- sentation in frequency-range-angle.
> ICASSP, Los Alami- tos, USA: IEEE Computer Society, 2009, 285–288.
> [6] Pollow, M., Nguyen, K.-V., Warusfel, O., Carpentier, T.,
> Müller-Trapet, M., Vorländer, M., and Noisternig, M. (2012). “Calculation
> of Head-Related Transfer Functions for Arbitrary Field Points Using
> Spherical Harmonics Decomposition,” Acta Acust United Ac, 98, 72–82.
> doi:10.3813/AAA.918493
> [7] M. J. Evans, J. A. S. Angus, A. I. Tew: Analyzing head- related
> transfer function measurements using surface spher- ical harmonics. J.
> Acoust. Soc. Am. 104 (1998) 2400– 2411
> [8] R. O. Duda, W. L. Martens: Range dependence of the re- sponse of a
> spherical head model. J. Acoust. Soc. Am. 104 (1998) 3048–3058.
>
>
> > On 24 Jan 2018, at 15:01, John Merchant <john.merch...@mtsu.edu> wrote:
> >
> > Tom Smurdon and Peter Stirling of Oculus presented research on
> near-field HRTF for VR at last fall's OC4. The video of that talk is
> available here:
> > https://www.youtube.com/watch?v=l7mhXRB9PA4
> >
> > ________________________________________
> > From: Sursound <sursound-boun...@music.vt.edu> on behalf of
> st...@mail.telepac.pt <st...@mail.telepac.pt>
> > Sent: Tuesday, January 23, 2018 8:12 PM
> > To: Surround Sound discussion group
> > Subject: Re: [Sursound] A submittal for a patent on Ambisonics?
> >
> > Citando Augustine Leudar <augustineleu...@gmail.com>:
> >
> >> Hi Jack,
> >>
> >> Aside from ILDs, ITDs, I also wondered if the pinna was able to
> distinguish
> >>
> >> very close sound sources due to the fact the wavefront would be much
> more
> >>
> >> curved almost spherical to the degree that it would be different
> pressure
> >>
> >> present at different folds of the pinna (ie  very close up  sound slike
> a
> >>
> >> mosquito) . I dont think theres been much done on that...
> >
> > Hi Augustine,
> >
> > I think "there has been done quite a lot on that"... 😉
> >
> > (Reproduction of near-field audio sources)
> >
> > Beside of spherical waves (and their consequences) we should not
> > overlook that any high-frequency emitting (annoying) mosquito next to
> > your left ear would be heard much softer at your right ear, the head
> > shadow being even more relevant at close distances.
> >
> > BR
> >
> > Stefan
> >
> > P.S.: It is important to know about the "depth" of a mosquito audio
> > object relative to your head, both in VR and in real life...
> >
> >> On 23 January 2018 at 11:58, jack reynolds <jackreynolds...@gmail.com>
> >>
> >> wrote:
> >>
> >>> It looks like a method for binaural rendering with multiple distance
> HRTFs.
> >>>
> >>>
> >>>
> >>> Ambisonics could be one of the inputs, but it seems to be aimed more at
> >>>
> >>> object based virtual reality, where the listener is more likely to come
> >>>
> >>> very close to an audio source.
> >>>
> >>>
> >>>
> >>> Most HRTFs are currently measured at 1m distance, so any objects closer
> >>>
> >>> than 1m are not currently rendered correctly.
> >>>
> >>>
> >>>
> >>> Far field HRTFs are closer to plane waves, whereas close up audio
> objects
> >>>
> >>> emit more spherical waves, creating greater differences in interaural
> time
> >>>
> >>> difference (ITD).
> >>>
> >>>
> >>>
> >>> Jack
> >>>
> >>>
> >>>
> >>> On 23 January 2018 at 11:18, Bearcat Şándor <bearcatsan...@gmail.com>
> >>>
> >>> wrote:
> >>>
> >>>
> >>>
> >>> I don't know a lot about patent law, but is this an attempt to tie up
> our
> >>>
> >>> beloved Ambisonics?
> >>>
> >>>
> >>>
> >>> http://www.freepatentsonline.com/y2017/0366912.html
> >>>
> >>>
> >>>
> >>> ....
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-- 
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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