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Practical implementation of personal audio in a mobile device

Practical implementation of personal audio in a mobile device
Practical implementation of personal audio in a mobile device
The widespread use of loudspeakers on mobile devices to reproduce audio in public spaces has led to issues of both user privacy and noise nuisance. Previous work has investigated the use of acoustic contrast control to optimize the performance of small arrays of loudspeakers to create a zone within which the audio program is audible, while minimizing the level reproduced elsewhere. These investigations have generally assumed that the dimensions of both the device within which the array is mounted and the loudspeaker drivers themselves are negligible, so that the array can be modeled as monopoles in the free field. Although this is reasonable at low frequencies the effect of both finite-sized baffle and sources on the optimized array performance is significant at higher frequencies. The effects of finite-sized baffle and sources are investigated for a two-source loudspeaker array mounted on a mobile phone-sized device through both finite element simulations and real-time implementation. The baffle is shown to reduce the performance of the array at frequencies greater than around 1 kHz for the geometry considered here, but the directivity of the individual drivers then enhances the performance at higher frequencies. The effects of implementing the optimal filters in the time-domain for a real-time system are also investigated.
1549-4950
290-300
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Kim, Youngtae
e3d9699e-0938-47b3-8346-4942fed62de2
Choi, Jung-Woo
ca4b1f63-87f3-4932-a445-1b20378b3599
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Kim, Youngtae
e3d9699e-0938-47b3-8346-4942fed62de2
Choi, Jung-Woo
ca4b1f63-87f3-4932-a445-1b20378b3599

Cheer, Jordan, Elliott, Stephen J., Kim, Youngtae and Choi, Jung-Woo (2013) Practical implementation of personal audio in a mobile device. Journal of the Audio Engineering Society, 61 (5), 290-300.

Record type: Article

Abstract

The widespread use of loudspeakers on mobile devices to reproduce audio in public spaces has led to issues of both user privacy and noise nuisance. Previous work has investigated the use of acoustic contrast control to optimize the performance of small arrays of loudspeakers to create a zone within which the audio program is audible, while minimizing the level reproduced elsewhere. These investigations have generally assumed that the dimensions of both the device within which the array is mounted and the loudspeaker drivers themselves are negligible, so that the array can be modeled as monopoles in the free field. Although this is reasonable at low frequencies the effect of both finite-sized baffle and sources on the optimized array performance is significant at higher frequencies. The effects of finite-sized baffle and sources are investigated for a two-source loudspeaker array mounted on a mobile phone-sized device through both finite element simulations and real-time implementation. The baffle is shown to reduce the performance of the array at frequencies greater than around 1 kHz for the geometry considered here, but the directivity of the individual drivers then enhances the performance at higher frequencies. The effects of implementing the optimal filters in the time-domain for a real-time system are also investigated.

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Published date: May 2013
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 353723
URI: https://eprints.soton.ac.uk/id/eprint/353723
ISSN: 1549-4950
PURE UUID: ba6974a0-30f3-4913-9d0d-fe5c7824ab99
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 17 Jun 2013 09:04
Last modified: 18 Jul 2019 14:56

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