When a loudspeaker of a mobile device is used in a public space, the side effects are the lack of personal privacy and annoying other people. There is, therefore, a need to reduce radiated power while preserving the sound pressure at the listener’s ears. Superdirective beamforming is one approach. A finite-element (FE) model of the two-source line array positioned on the mobile phone-sized baffle is defined and then used to investigate the effect of a finite-sized baffle on the directional pattern of the piston sources. Based on these results, a two-source personal audio system was implemented in real-time, and the results validated the predictions of the FE model. At frequencies where accurate transfer response measurements are achievable, the personal audio system performs as predicted by offline simulations.

Authors: Cheer, Jordan; Elliott, Stephen J.; Kim, Youngtae; Choi, Jung-Woo
Affiliations: Institute of Sound and Vibration Research, University of Southampton, UK; Digital Media & Communications R&D Center, Samsung Electronics Co. Ltd., Korea; Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Korea(See document for exact affiliation information.)
JAES Volume 61 Issue 5 pp. 290-300; May 2013
Publication Date: June 7, 2013

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