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Spatial filtering using directional audio coding parameters

: Kallinger, M.; Galdo, G. del; Kuech, F.; Mahne, D.; Schultz-Amling, R.


IEEE Signal Processing Society:
IEEE International Conference on Acoustics, Speech, and Signal Processing 2009. Proceedings. Vol.1 : April 19 - 24, 2009, Taipei International Convention Center, Taipei, Taiwan
Piscataway/NJ: IEEE, 2009
ISBN: 978-1-4244-2353-8
ISBN: 978-1-4244-2354-5
International Conference on Acoustics, Speech, and Signal Processing (ICASSP) <34, 2009, Taipei>
Conference Paper
Fraunhofer IIS ()

Directional audio coding (DirAC) is a recent method for spatial audio processing, based on a perceptually motivated representation of spatial sound. Due to its efficiency, DirAC has already been proposed for spatial audio teleconferencing scenarios. Modern hands-free communication systems usually include beamforming techniques to improve speech intelligibility by suppressing diffuse background noise and interfering sources. In this paper, we propose a novel spatial filtering method which can be integrated into the DirAC spatial codec. It uses a spectral weighting of the recorded audio signal, where the design of the corresponding spatial filter transfer function is based on the DirAC parameters, i.e., direction-of-arrival and diffuseness of the sound field. Simulation results show that compared to a standard beamformer the novel technique offers significantly higher interference attenuation, while introducing similar distortion of the desired signal.