ＡＢＣマスキング法における骨導聴力の０ｄＢ基準値

DOI 参考文献13件 オープンアクセス

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  • Bone Conduction Threshold Reference Levels in the BC Hearing Test using ABC Masking Method.

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A strategic masking method, so-called ABC method, was developed by the first author, and the bone-conduction threshold test was performed with a bone vibrator at the forehead, while the test ear wore a dummy earphone that produced the same occulusion effect as that on the non-sest ear produced by the masking earphone. Because of the occulusion effect yielded by the earphone, the standard reference equvalent threshold force level is not applicable to the bone-conduction test using the ABC method. In order to establish the normal reference level for the method, bone-conduction thresholds were determined using two bone vibrators, Radioear B-72 and Rion BR-41 for 30 young normal adults (30 ears) in the frequency range between 250 and 4000Hz. Equivalent threshold force levels were determined on the artificial mastoid type B & K 4930. The result showed that equivalent threshold force levels for the ABC method were improved by 14, 20, 8dB at the frequencies of 250, 500, 1000Hz respectively, compared to ISO 7566 (forehead coupling) reference levels. These improvements approximately coincided occulusion effects reported for the earphone with MX41/AR cusion.

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