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ICASSP
2011
IEEE

Resolving spatial sampling effects in parametric directional filtering

12 years 7 months ago
Resolving spatial sampling effects in parametric directional filtering
Directional Audio Coding (DirAC) represents an efficient scheme to analyze and reproduce spatial sound; the coded stream consists of a single-channel audio signal and few parameters. Estimation of these parameters ideally relies on figure-of-eight microphones and one omnidirectional microphone. The figure-of-eight directivity can be efficiently approximated by first-order differential microphone arrays. However, due to spatial sampling, there are considerable deviations from the required directivity at high frequencies. These deviations lead to incorrect spatial parameter estimates; especially, the instantaneous direction-of-arrival (DOA) becomes biased and – beyond a certain aliasing frequency – ambiguous. Parameters like the DOA drive subsequent processing units, e. g., for spatial filtering. In this paper we propose a novel strategy to compensate bias and ambiguity not directly w. r. t. the DOA but the output parameters of a spatial filtering processing unit. Simulation ...
Markus Kallinger, Michael Buerger, Oliver Thiergar
Added 21 Aug 2011
Updated 21 Aug 2011
Type Journal
Year 2011
Where ICASSP
Authors Markus Kallinger, Michael Buerger, Oliver Thiergart, Fabian Kuech, Dirk Mahne
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