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In situ microphone array calibration for parameter estimation in directional audio coding

: Thiergart, O.; Galdo, G. del; Taseska, M.; Pineda Pardo, J.A.; Kuech, F.

Audio Engineering Society -AES-:
128th Audio Engineering Society Convention 2010. CD-ROM : May 22-25, 2010, London, UK
New York, NY: AES, 2010
Convention Paper 8093
Audio Engineering Society (Convention) <128, 2010, London>
Conference Paper
Fraunhofer IIS ()

Directional audio coding (DirAC) provides an efficient representation of spatial sound using a downmix audio signal and parametric information, namely direction-of-arrival (DOA) and diffuseness of sound. Input to the DirAC analysis are B-format signals, usually obtained via microphone arrays. The DirAC parameter estimation is impaired when phase mismatch between the array sensors occurs. We present an approach for the in situ microphone array calibration solely based on the DirAC parameters. The algorithm aims at providing consistent parameter estimates rather than matching the sensors explicitly. It does neither require to remove the sensors from the array, nor depend on a priori knowledge such as the array size. We further propose a suitable excitation signal to assure robust calibration in reverberant environments.