Robinson D W, Shipton M S
Audiology. 1982;21(1):61-82. doi: 10.3109/00206098209072730.
Air-(ac) and bone-conduction (bc) thresholds were determined for 96 subjects in the age range 16-30 years. The bc tests were carried out using a B-71 vibrator applied to left and right mastoid under three conditions at the contralateral ear: unoccluded, masked at 25 dB and at 40 dB sensation level; ac audiometry and masking noise used a TDH-39 earphone. By a systematic process of otological classification of the subjects, the bc threshold for 'normal hearing' could be estimated with an uncertainty of less than 1 dB and interpolated for masking noise levels from zero to 40 dB sensation level. Results are expressed as alternating force levels in an artificial mastoid of current commercial design. Variance of the air-bone difference for individual ears is found to be less than the sum of ac and bc threshold variances calculated separately, implying strong air-bone correlation. Comparison is made with other recent studies using B-71 and KH-70-type vibrators, and average results are presented in the context of a proposed international standard for the normal threshold of hearing by bc.
对96名年龄在16至30岁之间的受试者测定了气导（ac）和骨导（bc）阈值。骨导测试使用B - 71振动器，在对侧耳的三种条件下分别施加于左右乳突：未掩蔽、在25 dB和40 dB感觉级下掩蔽；气导听力测定和掩蔽噪声使用TDH - 39耳机。通过对受试者进行系统的耳科学分类过程，可以估计出“正常听力”的骨导阈值，其不确定度小于1 dB，并可内插至从0到40 dB感觉级的掩蔽噪声水平。结果以当前商业设计的人工乳突中的交变力水平表示。发现单耳气骨导差的方差小于分别计算的气导和骨导阈值方差之和，这意味着气骨导之间有很强的相关性。与其他近期使用B - 71和KH - 70型振动器的研究进行了比较，并在拟议的骨导正常听力阈值国际标准的背景下给出了平均结果。
