Abstract
This study describes the driving principle and design of the bone conduction transducer that has improved the problems of the previously bone conduction transducer, and by evaluates the performance using the artificial mastoid. Through finite element analysis, the Lorentz force of the transducer was calculated and the shape of the vibrational membrane suitable for conductive hearing loss was derived. Compared to the previous transducer, the improved transducer has increased vibration displacement by about 6dB in all frequency bands. Based on the analysis results, a bone conduction transducer was implemented, and the output force level and total harmonic distortion were measured using an artificial mastoid. The output force level of the transducer was evaluated by comparing it with the output force level of the conventional bone conduction implant (BoneBridge). In addition, total harmonic distortion was evaluated based on ANSI S3.6 regulations. The improved transducer is judged to have a sufficient function as a transducer for bone conduction implants in the 1∼3kHz band which is the most important for speech discrimination. However, the output force level and total harmonic distortion in the low frequency band (less than 1 kHz) need improvement studies.
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