Effect of mouth-opening levels on sound field gain in the ear canal

Jen Fang Yu, Hsiang Chi Hsien, Kun Che Lee, Jimg Hong Xiao, Hsiu Hui Chiu, Hsiang Hsi Hong, Yu Fu Shen, Ying Chin Peng

Research output: Contribution to journalJournal Article peer-review

Abstract

The human external auditory canal can become deformed when the mandible moves, and this changes the sound field in the external auditory canal. This study measured the sound field gain in the external auditory canal while varying mouth-opening in three levels. The mandible was fixed at the 1/3, the 2/3, and the maximal mouth-opening levels. Seven 65-dB tones of 200, 500, 1000, 2000, 4000, 6000, and 8000 Hz, which are the sound pressure level and frequency range when people are talking at a normal level, were adopted as the sound stimulus to measure sound field gains at 5, 10, 15, and 20 mm to the interior of the external auditory canal. The results show that, with the exception of the 1.25 dB decrease from 12.96 to 11.71 dB at a depth of 5 mm with a stimulus at 8000 Hz, the differences in the sound field gain at the other depths and stimulus frequencies were within 1 dB and were not statistically significant. These results suggest that mouth-opening level has no effect on the measurement of the sound field in the external auditory canal.

Original languageEnglish
Article number5026692
JournalJournal of the Acoustical Society of America
Volume143
Issue number3
DOIs
StatePublished - 01 03 2018

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Publisher Copyright:
© 2018 Acoustical Society of America.

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