A realization of sound focused personal audio system using acoustic contrast control

Jiho Chang, Chan-Hui Lee, Jin-Young Park, Yang-Hann Kim

Research output: Contribution to journalJournal articleResearchpeer-review


A personal audio system that does not use earphone or any wire would have great interest and potential impact on the audio industries. In this study, a line array speaker system is used to localize sound in the listening zone. The contrast control [Choi, J.-W. and Kim, Y.-H. (2002). J. Acoust. Soc. Am. 111, 1695-1700] is applied, which is a method to make acoustically bright zone around the user and acoustically dark zone in other regions by maximizing the ratio of acoustic potential energy density between the bright and the dark zone. This ratio is regarded as acoustic contrast, analogous with what is used for optical devices. For the evaluation of the performance of acoustic contrast control, experiments are performed and the results are compared with those of uncontrolled case and time reversal array. © 2009 Acoustical Society of America.
Keyword: Acoustic variables control,Acoustic focusing,Acoustic transducer arrays,Audio systems,Loudspeakers,Audio acoustics
Original languageEnglish
JournalJournal of the Acoustical Society of America
Issue number4
Pages (from-to)2091-2097
Publication statusPublished - 2009
Externally publishedYes


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