Hello Markus,
many thanks for providing the literature list.
I am very busy just now, and simply don't have enough time to do some
"recherche" for the sursound list...
(Including doing some patent recherche, which will be up to the USPTO later. )
Best regards
Stefan (Schreiber)
Citando Markus Noisternig (IRCAM) <markus.noister...@ircam.fr>:
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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