Personal audio system for neckband headset with low computational complexity

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Personal audio systems have been developed based on various approaches with the goal of synthesizing an isolated sound zone that avoids disturbing others in different locations. In this work, a near-field solution for a neckband headset using three loudspeakers positioned close to each ear is proposed. In particular, it is an attempt to derive a simple multichannel filter for reducing the computational cost in mobile devices. Unlike super-directive beamforming techniques, the controlled radiation pattern is not highly directional but can boost the near-field sound, thereby providing an extra sound level difference between the listener's ear locations and far-field surrounding areas. For this purpose, a multichannel filter is designed using a conventional pressure matching technique for reproducing a target signal at the ear location while suppressing sound radiation to a far-field. It is shown that the optimal filter weights can be successfully approximated in the form of a simple broadside differential array pattern. The simplified filter structure can be realized using only two second-order infinite impulse response filters for driving the middle and two side loudspeakers. Through various simulations and experiments, it is demonstrated that the proposed solution can effectively realize a personal audio system with a minimal loss of sound isolation performance.
Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
Issue Date
2020-12
Language
English
Article Type
Article
Citation

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, v.148, no.6, pp.3913 - 3927

ISSN
0001-4966
DOI
10.1121/10.0002941
URI
http://hdl.handle.net/10203/279372
Appears in Collection
EE-Journal Papers(저널논문)
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