Abstract
In order to clarify the emission levels and hearing status of ultrasound used in an occupational spaces by pest control companies, three surveys were performed. The results of the acoustic field measurement showed that the rodent repellent device had a peak level and frequency of approximately 100 dB and 19 kHz, respectively. The results of an auditory evaluation experiment with 51 adult workers showed that younger workers recognized the ultrasound from the electronic rodent repellent device more clearly than the elderly workers.
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