Electro-acoustic performance of the new bone vibrator Radioear B81: A comparison with the conventional Radioear B71
Electro-acoustic performance of the new bone vibrator Radioear B81: A comparison with the conventional Radioear B71
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DOI：
10.3109/14992027.2014.980521
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发表时间：
2015-05-01
影响因子：
2.7
通讯作者：
Tengstrand, Tomas
中科院分区：
文献类型：
--
作者：
Jansson, Karl-Johan Freden;Hakansson, Bo;Tengstrand, Tomas
目的：对美国Radioear公司的B81骨振仪进行电声性能评价。将与广泛使用的B71进行比较，B71在低频时具有众所周知的限制。设计图：B81基于平衡电磁分离换能器（BEST）原理，平衡静态力，从而减少非线性失真力，提高最大听力水平。研究样本：在人工乳突上测量了每种骨振动器类型的六个设备的最大听力水平、总谐波失真（THD）、频率响应和电阻抗。结果：发现B81达到10.7-22.0 dB的最大值（@ THD。6%或V-in。6 V-RMS）的听力水平比B71的频率低于1500 Hz，并有显着较低的THD高达1000 Hz。除了在中频（α = 0.01）处的偏差（B81更有效且电阻抗几乎相同）外，其频率响应之间无统计学显著差异。结论：总体而言，与B71相比，B81具有改善的电声性能，并且与相同的听力计兼容。特别是，B81允许在比1500 Hz以下的B71高得多的听力水平下测量感音神经性听力损失。
Objective: The objective is to evaluate the electro-acoustic performance of a new audiometric bone vibrator, the B81 from Radioear Corporation, USA. Comparison will be made with the widely used B71 which has well-known limitations at low frequencies. Design: The B81 is based on the balanced electromagnetic separation transducer (BEST) principle where static forces are counterbalanced so that nonlinear distortion forces are reduced and maximum hearing levels can be increased. Study sample: Maximum hearing level, total harmonic distortion (THD), frequency response, and electrical impedance were measured for six devices of each bone vibrator type on an artificial mastoid. Results: It was found that B81 reaches 10.7-22.0 dB higher maximum (@ THD. 6% or V-in. 6 V-RMS) hearing levels than B71 for frequencies below 1500 Hz, and had significantly lower THD up to 1000 Hz. There was no statistically significant difference between their frequency response, except a deviation at the mid frequencies (alpha = 0.01) where B81 was more efficient and the electrical impedances were practically the same. Conclusions: In general, B81 had an improved electro-acoustic performance compared to B71 and is compatible with same audiometers. In particular, B81 allows for sensorineural hearing loss to be measured at considerably higher hearing levels than with B71 below 1500 Hz.