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An acoustical zoom based on informed spatial filtering

: Thiergart, Oliver; Kowalczyk, Konrad; Habets, Emanuël A.P.


Institute of Electrical and Electronics Engineers -IEEE-:
14th International Workshop on Acoustic Signal Enhancement, IWAENC 2014 : Juan-les-Pins, 8-11 September 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-6808-4
International Workshop on Acoustic Signal Enhancement (IWAENC) <14, 2014, Juan-les-Pins>
Fraunhofer IIS ()

In digital cameras, a visual zoom allows for narrowing the apparent angle of view in a video or an image. When audio signals complement the visuals, a desirable function would be to provide an acoustical zoom which is aligned with the visual image. In this paper, an approach is presented to achieve such a zoom effect using a microphone array. Acoustical zooming is realized by a weighted sum of the extracted direct sound and diffuse sound, whereas the weights depend on the zooming factor. In contrast to former approaches which are based on single-channel filters, the proposed approach used two recently proposed informed multi-channel filters for the extraction of the direct sound and diffuse sound. Simulation results verify the good performance even in difficult double-talk scenarios.