Richards W D, Frank T
Ear Hear. 1982 Jan-Feb;3(1):37-8. doi: 10.1097/00003446-198201000-00008.
Frequency response curves were obtained for a Radioear B-71 and a B-72 bone vibrator with a revised Bruel and Kjaer model 4930 artificial mastoid. The curves for each vibrator were characterized by three resonant peaks which decreased in amplitude as frequency increased. The maximal output voltage variations of the artificial mastoid were less than or equal to 2 dB for each vibrator at all audiometric frequencies (+/- 3%), except for the B-72 at 4000 Hz where the variation was 6.9 dB. Overall, the findings were interpreted to question the use of a +/- 3% frequency tolerance for the generation and calibration of reference bone conduction thresholds.
使用经过改进的Bruel和Kjaer 4930型人工乳突，获得了Radioear B - 71和B - 72骨振动器的频率响应曲线。每个振动器的曲线都有三个共振峰，其幅度随着频率的增加而减小。在所有听力测定频率（±3%）下，每个振动器的人工乳突的最大输出电压变化均小于或等于2 dB，但B - 72在4000 Hz时的变化为6.9 dB。总体而言，这些发现对使用±3%的频率容差来产生和校准参考骨导阈值提出了质疑。
