Last month the last paper from work done during my thesis was published in the Journal of the Audio Engineering Society. We tested localisation for off-centre listeners with third order Ambisonics for two different noise signals: transient and non-transient. We found, in line with Precedence Effect literature, that the transient signal produced sound images pulled more towards the nearer loudspeakers than the non-transient signal.
We also tested different localisation models. All of them were relatively good at predicting the perceptual results. The best results were obtained by an extended version of Gerzon’s energy vector that includes elements of localisation dominances and the precedence effect (See here for an overview and here for the paper).
P. Stitt, S. Bertet, and M. van Walstijn, “Off-Centre Listening with Third-Order Ambisonics: Dependence of Perceived Source Direction on Signal Type,” J. Audio Eng. Soc., vol. 65, no. 3, pp. 118–197, 2017.
Links: DOI – ResearchGate
Last month we had a paper published in the Journal of the Acoustical Society of America (JASA) on the influence of large head movements with head-tracked binaural when using non-individual HRTFs. In brief, we found that large head movements helped improve localisation for frontal and rear sources, had little impact on lateral sources and that micro head movements didn’t seem to produce increased externalisation. You can get a lot more detail (even individual subject results) from the paper itself!
The work was lead by Etienne Hendrickx and was a collaboration as part of the BiLi Project. In this case the partners were LIMSI-CNRS (during my post-doc) and the Conservatoire de Paris (CNSMdP).
E. Hendrickx, P. Stitt, J.-C. Messonnier, J.-M. Lyzwa, B. F. Katz, and C. de Boishéraud, “Influence of head tracking on the externalization of speech stimuli for non-individualized binaural synthesis,” J. Acoust. Soc. Am., vol. 141, no. 3, pp. 2011–2023, 2017.
Links: DOI – ResearchGate
I’ve had a paper accepted to the Journal of the Audio Engineering Society based on some of the work from my thesis. It was published last week.
The title is “Extended Energy Vector Prediction of Ambisonically Reproduced Image Direction at Off-Centre Listening Positions“. It presents an extension to the energy vector (rE) of Gerzon used in the Ambisonics literature. The extension allows for better prediction of localisation for listeners who aren’t equidistant from all loudspeakers.
It basically adds elements of the precedence effect (or “Law of the First Wavefront”) to the energy vector. This means it can now be used to predict time-delay panning, in addition to amplitude panning.
You can download the paper in the AES e-Library:
- P. Stitt, S. Bertet, and M. van Walstijn, “Extended energy vector prediction of ambisonically reproduced image direction at off-center listening positions,” J. Audio Eng. Soc., vol. 64, no. 5, pp. 299–310, 2016. DOI: http://dx.doi.org/10.17743/jaes.2016.0008
I’ll be posting some supplementary data and tools in the near future. There’ll be some examples of the usage and some listening area localisation maps.
Check back soon!
The paper I presented at the Auralization and Ambisonics symposium in Berlin last April has been published in Acta Acustica united with Acustica. There are also 9 other papers from the conference that were chosen and definitely all are worth looking at. You can see the table of contents for the new issue here.