在基频音调下方出现的陡相和缓相梯度畸变产物耳声发射。
Steep and shallow phase gradient distortion product otoacoustic emissions arising basal to the primary tones.
作者信息
Martin Glen K, Stagner Barden B, Fahey Paul F, Lonsbury-Martin Brenda L
机构信息
Research Service 151, VA Loma Linda Healthcare System, Loma Linda, California 92357, USA.
出版信息
J Acoust Soc Am. 2009 Mar;125(3):EL85-92. doi: 10.1121/1.3073734.
Abstract
Distortion product otoacoustic emission (DPOAE) level/phase maps were collected in humans with and without an interference tone (IT) near the DPOAE frequency place (f(dp)) at primary-tone levels of 75 dB SPL. A DPOAE component with the expected steep phase gradient could be extracted at f(dp), however, considerable vertical-phase banding, presumably indicative of reflection emissions, remained. An IT placed 0.33 oct above f(2) removed most of this banding, revealing DPOAE components originating basal to the IT frequency place. These findings suggest that the commonly accepted two-source model of DPOAE generation may need to be qualified when higher primary-tone levels are utilized.
摘要
在75 dB SPL的基音水平下，对有或没有在畸变产物耳声发射（DPOAE）频率位置（f(dp)）附近的干扰音（IT）的人类进行了DPOAE水平/相位图采集。在f(dp)处可以提取出具有预期陡峭相位梯度的DPOAE成分，然而，仍然存在相当多的垂直相位条纹，推测这表明存在反射发射。一个置于f(2)上方0.33倍频程处的IT消除了大部分这种条纹，揭示了源自IT频率位置基底的DPOAE成分。这些发现表明，当使用更高的基音水平时，普遍接受的DPOAE产生的双源模型可能需要修正。
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