Billings B L, Winter M
J Speech Hear Res. 1977 Dec;20(4):653-60. doi: 10.1044/jshr.2004.653.
Two bone conduction vibrators (Radioear B71 and B72) and a headband (Radioear P-3333) have been developed to meet specifications of both the International Electrotechnical Commission and the American National Standard Institute. Pure-tone thresholds for air conduction and bone conduction were obtained from 24 normal-hearing young adults at audiometric frequencies between 250 and 4000 Hz. Results of this study are in good agreement with the standard air conduction threshold sound pressure levels (ANSI) and with bone conduction threshold force levels reported in the literature.
已研发出两款骨传导振动器（Radioear B71和B72）及一个头带（Radioear P - 3333），以满足国际电工委员会和美国国家标准学会的规范要求。从24名听力正常的年轻成年人中获取了250至4000赫兹听力测试频率下的气导和骨导纯音阈值。本研究结果与标准气导阈值声压级（ANSI）以及文献中报道的骨导阈值力级高度吻合。
