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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