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2008
Conference Paper
Titel
Planar microphone array processing for the analysis and reproduction of spatial audio using directional audio coding
Alternative
Planare Mikrofonanordnung zur Analyse und Wiedergabe von räumlichem Ton mittels Richtungs-Audiocodierung
Abstract
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.