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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