Regularisation and robustness of personal audio systems

Abstract

As well as being able to reproduce sound in one region of space it would be useful to reduce the level of reproduced sound in other spatial regions, with a “personal audio” system. For mobile devices this is motivated by issues of privacy for the user and the need to reduce annoyance for other people nearby. Such personal audio systems can be realised with arrays of loudspeakers that become superdirectional at low frequencies, when the array dimensions are small compared with the acoustic wavelength. The design of the array then becomes a compromise between performance and array effort, defined as the sum of the squared driving signals. Various methods of formulating this tradeoff as a regularisation problem have been suggested and the connection between these formulations is discussed. Large array effort are due to strongly self-cancelling multipole arrays. A concern is then the robustness of such as array to variations in the acoustic environment and driver sensitivity and position. The design of an array that is robust to these uncertainties then leads to a generalisation of regularisation

More information

Identifiers

ORCID for J. Cheer: orcid.org/0000-0002-0552-5506

Catalogue record

Export record