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Planar microphone array processing for the analysis and reproduction of spatial audio using directional audio coding

Planare Mikrofonanordnung zur Analyse und Wiedergabe von räumlichem Ton mittels Richtungs-Audiocodierung
: Schultz-Amling, R.; Küch, F.; Kallinger, M.; Galdo, G. del; Ahonen, J.; Pulkki, V.

Audio Engineering Society -AES-:
124th Audio Engineering Society Convention 2008. Vol.1 : May 17 - 20, 2008, Amsterdam, the Netherlands
Red Hook, NY: Curran, 2008
ISBN: 978-1-605-60295-0
Audio Engineering Society (Convention) <124, 2008, Amsterdam>
Conference Paper
Fraunhofer IIS ()

Recording and reproduction of spatial audio is important with multichannel audio applications. Directional Audio Coding (DirAC) represents a well proven approach for the analysis and reproduction of spatial sound. The direction-of-arrival and the diffuseness of the sound field is estimated in subbands using B-format signals, which can be created by 3-D omnidirectional microphone arrays. A 3-D microphone configuration is however not practical in consumer applications. Therefore, it is proposed a new approach which allows for an approximation of the required B-format signals, but is based on a planar microphone configuration only. Comparisons with the standard DirAC approach confirm that the proposed method is able to correctly estimate the desired parameters within a wide range of frequency and the spatial resolution matches the human perception. Teleconferencing requires only 2-D spatial audio reproduction. In this case, only the azimuth angle of the DOA has to be estimated together with the diffuseness. For computing the azimuth angle, only the X- and Y- dipole are required. Thus, a planar array is already sufficient to determine the 2-D DOA of sound. Further, it is discussed a method to estimate the diffuseness of a 3-D sound field based on a 2-D DirAC analysis.