The implementation of an active headrest for personal audio

Jones, M. and Elliott, S.J. (2005) The implementation of an active headrest for personal audio. Proceedings of the 12th International Congress on Sound and Vibration (ICSV12), Lisbon, Portugal. 10 - 13 Jul 2005. 8 pp .

Abstract

His paper reports on the practical implementation of a pair of seats with an active headrest designed to reproduce an acoustic signal in one seat, but attenuate it in the adjacent seat. This could be used to realise a "personal audio" system in each seat with reduce interference between seats. Initially a self-contained unit consisting of a pair of loudspeakers has been incorporated into one wing of the headrest, the signal fed to the outer loudspeaker which is filtered so as to maximise the acoustic contrast between the two seats so that the sound in the adjacent seat is reduced to the greatest possible extent while maintaining the reproduced level in the first seat. Significant improvements in the acoustic contrast are possible up to about 2kHz, above which the cross-talk between the seats is controlled by passive effects such as the directivity of the loudspeakers and the acoustic absorption of the headrest.

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