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First-order Superdirectional Acoustic Zooming in the Presence of Directional Interferences


These file attachments have been under embargo and were made available to the public after the embargo was lifted on 24 August 2011.

Author: Derkx, R.M.M.
Type:Conference paper
Embargo lifted:2011-08-24
Publisher: IEEE
Institution: Philips Research
Source:HSCMA 2011: 3rd IEEE Joint Workshop on Hands-free Speech Communication and Microphone Arrays, Edinburgh, UK, 30 May-1 June 2011
Identifier: MS 32.284
Keywords: array processing · microphones
Rights: (c) IEEE


Previously proposed superdirective acoustic zooming techniques mainly focus on controlling the directivity-factor of the constructed beampattern as a function of the zoom-parameter. This means that thesezooming techniques are only consistent in the case of spherically isotropic interferences. In practical situations however, often directional interferences (mainly coming from a single direction) are present. To have a consistent behaviour of the acoustic zooming, we willpropose a new zooming technique that is based on a novel beampattern construction. The beampattern is constructed in such a way that for every angle, the response is monotonically increasing/decreasing in a consistent way with the zooming-parameter.

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