%0 Journal Article
%T Safety of the HyperSound£¿ Audio System in subjects with normal hearing
							| Audiology Research
%A Brian A. Kappus
%A Ritvik P. Mehta
%A Robin L. Seitzman
%A Sara L. Mattson
%J Audiology Research
%D 2015
%R https://doi.org/10.4081/audiores.2015.136
%X The objective of the study was to assess the safety of the HyperSound£¿ Audio System (HSS), a novel audio system using ultrasound technology, in normal hearing subjects under normal use conditions; we considered preexposure and post-exposure test design. We investigated primary and secondary outcome measures: i) temporary threshold shift (TTS), defined as >10 dB shift in pure tone air conduction thresholds and/or a decrement in distortion product otoacoustic emissions (DPOAEs) >10 dB at two or more frequencies; ii) presence of new-onset otologic symptoms after exposure. Twenty adult subjects with normal hearing underwent a pre-exposure assessment (pure tone air conduction audiometry, tympanometry, DPOAEs and otologic symptoms questionnaire) followed by exposure to a 2-h movie with sound delivered through the HSS emitter followed by a post-exposure assessment. No TTS or new-onset otological symptoms were identified. HSS demonstrates excellent safety in normal hearing subjects under normal use conditions
%K Hypersound£¿
%K ultrasonic hearing
%K directional audio
%K ultrasound safety.
%U https://www.audiologyresearch.org/index.php/audio/article/view/136