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Reduction of 3D Ambisonic to 2D using plane-wave decomposition

Thibaut Carpentier
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Abstract

This articles deals with the reduction – or “projection” or “downscaling” – of a 3D-encoded Ambisonic sound field (“full-sphere” or “periphonic”) into a 2D representation (“horizontal-only” or “planar” or “pantophonic”). We show that the reduction operation can be equivalently achieved by 1) applying conversion formula of the normalization factors, or 2) performing a plane-wave decomposition of the original sound field and re-encoding the resulting plane waves to 2D Ambisonic. The latter approach provides greater flexibility in adapting the content to horizontal-only reproduction.
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Dates and versions

hal-03670900 , version 1 (17-05-2022)

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  • HAL Id : hal-03670900 , version 1

Cite

Thibaut Carpentier. Reduction of 3D Ambisonic to 2D using plane-wave decomposition. 152nd Convention of the Audio Engineering Society, May 2022, La Haye, Netherlands. ⟨hal-03670900⟩
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