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Design and Limitations of Non-Coincidence Correction Filters for Soundfield Microphones

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The tetrahedral microphone capsule arrangement in a Soundfield microphone captures a so-called A-format signal which is then converted to a corresponding B-format signal. The phase differences between the A-format signal channels due to non-coincidence of the microphone capsules cause errors in the corresponding B-format signals and linear combinations thereof. Various strategies for designing B-format non-coincidence correction filters are compared and limitations are discussed.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=14962

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AES - Audio Engineering Society