New Ambisonis Plugins

a7Compressor

I’ve released a set of Ambisonics plugins over on my main website that you might want to check out: https://spatialaudio.xyz

The set includes first-, third- and seventh-order versions of the following plugins:

  • aXPanner – Ambisonics encoder
  • aXRotate – Ambisonics sound field rotation
  • aXMonitor – Ambisonics decoder to binaural and stereo
  • aXCompressor – A compressor that preserves the delicate spatial relationship in the Ambisonics signals.
  • aXGate – A noise gate and downwards expander that preserves the delicate spatial relationship in the Ambisonics signals.
  • aXEqualizer – An EQ that preserves the delicate spatial relationship in the Ambisonics signals.
  • aXDelay – A delay plugin with 5 modules that lets you place the delayed signals wherever you want in the 3D sound field.

There are EDU and bulk discounts available if you get in touch!

Advertisements

New Ambisonics Plugin!

I’ve just released a new first-order Ambisonic panner over on my new website. It’s absolutely free and you can read more about it here.

New Website!

I’m moving to a new website that will have content for some of the freelance work I’ve been doing, as well as gathering some of the content I’ve already got on this site.

Visit now 🙂

The VST and Matlab downloads are now available on the new site under ‘Downloads’.

New Paper: Localisation with Third Order Ambisonics and Off-Centre Listeners

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

 

New Paper: Externalisation with Head Tracked Binaural

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: DOIResearchGate

 

Binaural and Head Tracking Paper

The Audio Engineering Society has put up the papers for the upcoming 140th AES Convention in Paris. You can download my paper here.

The paper was done in collaboration with the Conservatoire national supérieur de musique et de danse de Paris, who will also have some very interesting demos on a stand at the Convention.

It’s a study comparing perception of sound source stability between 1- and 5-source sound scenes for different levels of latency. I’ll be presenting it on the last day of the convention in the Immersive Audio section.

New Paper: Energy Vector for Off-Centre Positions

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:

  1. 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!