Is cartilage conduction classified into air or bone conduction?
Is cartilage conduction classified into air or bone conduction?
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DOI：
10.1002/lary.24485
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发表时间：
2014-05-01
期刊：
影响因子：
2.6
通讯作者：
Levitt, Harry
中科院分区：
文献类型：
--
作者：
Nishimura, Tadashi;Hosoi, Hiroshi;Levitt, Harry
目的/假设本研究的目的是建立Hosoi(2004)提出的软骨传导的声传播特性，该声传导是通过从换能器传递到耳软骨的振动信号来获得的。分别在0.5、1、2和4 kHz频率下测量耳塞和不戴耳塞时的气导、骨和软骨传导阈值。用头部和躯干模拟器对空气和软骨传导时耳膜上的声压水平进行了比较。结果在气导和软骨传导的阈值下，鼓膜上的声压级估计值相差在10分贝以内。相比之下，软骨传导阈值处的力水平明显低于骨传导阈值。这些发现表明，声音可能是通过软骨传导的鼓膜传递的。在0.5 kHz时，耳塞引起的阈值漂移在骨和软骨传导之间没有显著差异。在1 kHz和2 kHz时，阈值漂移按骨、软骨和气导的顺序显著增加。这些结果表明，耳道软骨部振动引起的空气声在软骨传导的声传导中起着重要的作用。结论软骨传导具有不同于常规空气和骨传导的特点.证据与喉镜，124：1214-1219,2014
Objectives/HypothesisThe aim of this study was to establish the sound transmission characteristics of cartilage conduction proposed by Hosoi (2004), which is available by a vibration signal delivered to the aural cartilage from a transducer.Study DesignExperimental study.MethodEight volunteers with normal hearing participated. Thresholds at frequencies of 0.5, 1, 2, and 4 kHz for air conduction, bone, and cartilage conductions were measured with and without an earplug. The sound pressure levels on the eardrum at the threshold estimated with a Head and Torso Simulator were compared between air and cartilage conductions. The force levels calibrated with an artificial mastoid at the threshold were compared between bone and cartilage conductions.ResultsThe difference in the estimated sound pressure levels on the eardrum at the thresholds between air and cartilage conductions were within 10 dB. In contrast, the force levels at the thresholds for cartilage conduction were remarkably lower than those for bone conduction. These findings suggested that sounds were probably transmitted via the eardrum for cartilage conduction. The threshold shifts by an earplug showed no significant difference between bone and cartilage conductions at 0.5 kHz. At 1 and 2 kHz, the threshold-shifts increased significantly in the order of bone, cartilage, and air conductions. These results suggested that airborne sound induced by the vibration of the cartilaginous portion of the ear canal played a significant role in sound transmission for cartilage conduction.ConclusionsCartilage conduction has different characteristics from conventional air and bone conductions.Level of EvidenceN/A. Laryngoscope, 124:1214-1219, 2014