Use of Modified Simplex Procedure in Hearing Aid Fine-Tuning

• Main Authors: Shih-Hao Lin, 林士豪
• Other Authors: Shuenn-Tsong Young
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/71276944151632168961

碩士 === 國立陽明大學 === 醫學工程研究所 === 94 === The numerous parameters of modern digital hearing aids and the multi-dimensional perceptual preferences of a subject present the audiologist with a difficult fitting task. A system was designed for integrating various real-world scenarios selected from the questionnaires related to the most important benefits for hearing aid and from common fitting guidelines, and an automatic modified simplex procedure was proposed to perform efficient search for the optimal preference structure in a subject’s perceptual space. The experiments were conducted using 6 normal subjects. Six parameters, including low-frequency gain, high-frequency gain, compression threshold, compression ratio, attack time and release time, were varied to find the tolerable noisy level and the desired loudness in two experiments. The results showed that the modified simplex procedure worked efficiently for all cases; however, the test-retest reliabilities should still be improved. Besides, the preferred parameters were different by comparing the inter-subject judgments for the same objective and the within-subject judgments for different objectives. The results indicated that there are multiple peaks in one’s response surface and further studies are required to improve reliability and satisfaction when fitting more complicated parameter ‘sets.