Increasing motivation to reproduce realistic sound scenes for hearing-instrument users has raised the question whether spatial sound reproduction methods are capable of reproducing sound accurately also for listeners that listen through a hearing instrument with a beamformer. This study presents an analysis of the pressure magnitude errors induced in the output of a beamformer when it is exposed to a sound field produced by amplitude panning. Simulations show that reproduction artifacts are generated by errors in the phase shifts between microphone capsules and due to destructive interference of the sound pressures produced by the reproduction loudspeakers. Using amplitude panning in applications involving listening through beamformers requires the controlling of these sources of errors. It is shown that the adequate loudspeaker span for a given maximum error depends on the directivity of the beamformer in use.

Authors: Koski, Teemu; Fazi, Filippo; Pulkki, Ville
Affiliations: Aalto University, Espoo, Finland; University of Southampton, Southampton, UK(See document for exact affiliation information.)
AES Conference: 55th International Conference: Spatial Audio (August 2014)
Paper Number: P-9
Publication Date: August 26, 2014
Subject: Posters

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