Effects of vibrator placement in the auricle on cartilage- conduction hearing: Assessments of detection threshold and ear canal sound pressure
* Presenting author
Bone-conduction has been used as hearing aids for the conductive hearing impairment, but there was a problem in the wearability of the transducer. To solve the problem, cartilage-conduction (CC) that presents the transducer to the auricular cartilage has been proposed and applied to hearing aids and smartphones. In the CC, the hearing changes depending on the presentation site within the auricle, the contact area of the transducer and the contact pressure, but effects of such conditions has not been studied. In this study, we observed variations of the threshold and the sound pressure in the ear canal (ECSP) depending on the position of the transducer within the auricle. Tone bursts with frequencies from 250 to 8,000 Hz were presented to the upper, middle and lower parts of the auricle. Both measurements were also conducted under conditions that the transducer did not contact the auricle. The results showed that he threshold decreased and the ECSP increased when presented at the middle and lower auricles at lower frequencies (250 and 500 Hz). These results provide useful information not only to optimize the devices using CC, but also to elucidate the peripheral mechanism of the CC perception.