B-format is usually obtained from A-format signals, i.e., from four directive microphone capsules pointing in different directions. Ideally, these capsules should be coincident, but due to design constraints, small distances always remain between them. As a result the phase mismatches between the microphone capsule signals lead to inaccuracies and interferences, impairing B-format directional responses, especially at high frequencies. A non-coincidence correction is proposed based on adaptive phase matching of the four microphone A-format signals before conversion to B-format, improving the directional responses at high frequencies, enabling higher focus, better spatial image and timbre in B-format signals.

Authors: Favrot, Alexis; Faller, Christof
Affiliations: Illusonic GmbH, Uster, Switzerland; EPFL, Lausanne, Switzerland(See document for exact affiliation information.)
AES Convention: 144 (May 2018) Paper Number: 9941
Publication Date: May 14, 2018
Subject: Spatial Audio-Part 1

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