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Metrics for performance assessment of mixed-order Ambisonics spherical microphone arrays

Sylvain Emmanuel Favrot, Márton Marschall

Open publisher page 3 citations

Abstract

Mixed-order Ambisonics (MOA) combines planar (2D) higher order Ambisonics (HOA) with lower order periphonic (3D) Ambisonics. MOA encoding from spherical microphone arrays has the potential to provide versatile recordings that can be played back using 2D, 3D or mixed systems. A procedure to generate suitable layouts for a given MOA combination order is introduced consisting of rings of microphones at several elevation angles for any given MOA combination order. Robustness and directivity measures were evaluated for four MOA layouts. Results showed that MOA vertical directivity was similar to 3D HOA and that MOA horizontal directivity was in between the planar and periphonic order.

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What this paper is about

Mixed-order Ambisonics (MOA) combines planar (2D) higher order Ambisonics (HOA) with lower order periphonic (3D) Ambisonics. MOA encoding from spherical microphone arrays has the potential to provide versatile recordings that can be played back using 2D, 3D or mixed systems. A procedure to generate suitable layouts for a given MOA combination order is introduced consisting of rings of microphones at several elevation angles for any given MOA combination order. Robustness and directivity measures were evaluated for four MOA layouts. Results showed that MOA vertical directivity was similar to 3D HOA and that MOA horizontal directivity was in between the planar and periphonic order.

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Available abstract

Mixed-order Ambisonics (MOA) combines planar (2D) higher order Ambisonics (HOA) with lower order periphonic (3D) Ambisonics. MOA encoding from spherical microphone arrays has the potential to provide versatile recordings that can be played back using 2D, 3D or mixed systems. A procedure to generate suitable layouts for a given MOA combination order is introduced consisting of rings of microphones at several elevation angles for any given MOA combination order. Robustness and directivity measures were evaluated for four MOA layouts. Results showed that MOA vertical directivity was similar to 3D HOA and that MOA horizontal directivity was in between the planar and periphonic order.

Key concepts: Ambisonics, Microphone, Order (exchange), Computer science, Acoustics, Computer graphics (images), Physics, Loudspeaker

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