Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA.
J Acoust Soc Am. 2011 Feb;129(2):817-27. doi: 10.1121/1.3531864.
Distortion-product otoacoustic emission (DPOAE) suppression data as a function of suppressor level (L(3)) for f(2) frequencies from 0.5 to 8 kHz and L(2) levels from 10 to 60 dB sensation level were used to construct suppression tuning curves (STCs). DPOAE levels in the presence of suppressors were converted into decrement versus L(3) functions, and the L(3) levels resulting in 3 dB decrements were derived by transformed linear regression. These L(3) levels were plotted as a function of f(3) to construct STCs. When f(3) is represented on an octave scale, STCs were similar in shape across f(2) frequency. These STCs were analyzed to provide estimates of gain (tip-to-tail difference) and tuning (Q(ERB)). Both gain and tuning decreased as L(2) increased, regardless of f(2), but the trend with f(2) was not monotonic. A roughly linear relation was observed between gain and tuning at each frequency, such that gain increased by 4-16 dB (mean ≈ 5 dB) for every unit increase in Q(ERB), although the pattern varied with frequency. These findings suggest consistent nonlinear processing across a wide frequency range in humans, although the nonlinear operation range is frequency dependent.
畸变产物耳声发射（DPOAE）抑制数据作为抑制器水平（L(3)）的函数，用于构建抑制调谐曲线（STC），频率范围为 0.5 至 8 kHz，f(2)频率范围为 10 至 60 dB 感觉水平。存在抑制剂时的 DPOAE 水平转换为与 L(3)的函数关系，通过转换线性回归得出导致 3 dB 衰减的 L(3)水平。这些 L(3)水平作为 f(3)的函数绘制，以构建 STC。当 f(3)表示为倍频程时，STC 在 f(2)频率上具有相似的形状。分析这些 STC 以提供增益（头尾差异）和调谐（Q(ERB)）的估计值。无论 f(2)如何，增益和调谐都随着 L(2)的增加而降低，但与 f(2)的趋势并非单调。在每个频率下，增益和调谐之间观察到大致线性关系，使得增益增加 4-16 dB（平均值约为 5 dB），而 Q(ERB) 增加一个单位，尽管频率不同。这些发现表明在人类中存在一致的非线性处理，尽管非线性操作范围取决于频率。
