Frank T, Holmes A
Ear Hear. 1981 Mar-Apr;2(2):59-63. doi: 10.1097/00003446-198103000-00001.
Our purpose was to investigate the influence of acoustic radiation produced by bone vibrators at 4000 Hz on bone conduction (BC) testing. In one study, BC thresholds were obtained with a Radioear B-70A, B-71, and B-72 vibrator when the subject's ear canal was unoccluded and occluded. In another study, probe-tube microphone measurements were made just inside the entrance to the ear canal for each vibrator and for an air conduction source at comparable sensation levels. Results of both studies were interpreted to indicate that the B-70A and B-71 produced minimal acoustic radiation. However, the B-72 was found to have excessive acoustic radiation which would be sufficient to influence BC thresholds and produce an invalid high-frequency air-bone gap.
我们的目的是研究骨振动器在4000Hz时产生的声辐射对骨传导（BC）测试的影响。在一项研究中，当受试者耳道未堵塞和堵塞时，使用Radioear B - 70A、B - 71和B - 72振动器获得骨传导阈值。在另一项研究中，针对每个振动器以及在可比感觉水平下的气导源，在耳道入口内侧进行探头管麦克风测量。两项研究的结果均表明，B - 70A和B - 71产生的声辐射最小。然而，发现B - 72具有过多的声辐射，足以影响骨传导阈值并产生无效的高频气骨导差。
