I have also been quite interested in pin point the best ITD calculation method (and frequency cut off) that best relates to perceptual data.As for matlab code I can recommend the AMToolbox (ITD estimator). It supports various estimation methods and you can adjust LP cutoff frequency to get ITDs considering various bandwidths. You can load any SOFA format HRTF dataset.Best,- Frederico PereiraOn Fri, Jan 26, 2024 at 5:04 AM Pierre Divenyi <pdivenyi@xxxxxxxxxxxxxxxxxx> wrote:Greetings all,Interesting Brian, but I would much like to know what Jens Blauert thinks of all this.Best,PierrePardon my typos. It's Apple's fault.On Jan 24, 2024, at 02:06, Brian FG Katz <brian.katz@xxxxxxxxxxxxxxxxxxxxxx> wrote:Dear Dr. Rhebergen, list,
There has been some discussion over the years about the frequency dependence of ITD. While of course it is possible to calculate almost anything, the physicality of such a notion remains tenuous in my opinion, as air is not particularly a dispersive medium (i.e. low frequencies are not travelling around the head faster that higher frequencies). I therefore offer several points for thought on the question…
In general, when considering ITD data, one must be aware of the calculation method, as different methods can produce significantly different results. See for example our study a decade ago now on the subject:
B. F. G. Katz and M. Noisternig, “A comparative study of interaural time delay estimation methods,” J Acoust Soc Am, vol. 135, no. 6, pp. 3530–3540, 2014, doi:10.1121/1.4875714
Following this, there remains the question of which ITD estimation method is most coherent with perception. A follow-up study on this point was also carried out on that point as well:
A. Andreopoulou and B. F. G. Katz, “Identification of perceptually relevant methods of inter-aural time difference estimation,” J Acoust Soc Am, vol. 142, no. 2, pp. 588–598, 2017, doi:10.1121/1.4996457.
The following chapter also provides an overview and some graphical data on ITD for the Neumann KU100, including function of distance:
B. F. G. Katz and R. Nicol, “Binaural spatial reproduction,” in Sensory Evaluation of Sound (N. Zacharov, ed.), pp. 349–388, Boca Raton: CRC Press, 2019, (url). ISBN 978-1-4987-5136-0.
Cheers,
-Brian
--
Brian FG Katz, Research Director, CNRS
Groupe Lutheries - Acoustique – Musique
Sorbonne Université, CNRS, UMR 7190, Institut Jean Le Rond ∂'Alembert
De : AUDITORY - Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx> De la part de Rhebergen, K.S. (Koen)
Envoyé : mardi 23 janvier 2024 15:17
À : AUDITORY@xxxxxxxxxxxxxxx
Objet : [AUDITORY] ITD KEMAR/HATS data as a function of frequency and azimuth
Dear list,
I am looking for a lookup table (or matlab code ) with ITD data measured with a KEMAR of hats in an anachoric room as a function of frequency (~100Hz to 8000Hz) and azimuth (0:5:180)
If someone can send me a copy or matlab code it would be greatly appreciated.
With kind regards
Koen Rhebergen
Dr. K.S. Rhebergen
Klinisch fysicus - audioloog | functiecentrum KNO (AZU) | Kind & Communicatie (WKZ)
Universitair Medisch Centrum Utrecht
--Frederico Pereira
Mobile:+351 937356301Audio and Acoustics, Perception Interaction and Usability
