The combined influence of primary-level differences (L1-L2) and primary-frequency ratio (f2/f1) on distortion product otoacoustic emission (DPOAE) level was investigated in 20 normal-hearing subjects. DPOAEs were recorded with continuously varying stimulus levels for the following stimulus conditions: f2 = 1, 2, 4, and 8 kHz and f2/f1 = 1.05 to 1.4; various L1-L2, including one individually optimized to produce the largest DPOAE. For broadly spaced primary frequencies at low L2 levels, the largest DPOAEs were recorded when L1 was much higher than L2, with L1 remaining relatively constant as L2 increased. As f2/f1 decreased, the largest DPOAEs were observed when L1 was closer to L2 and increased as L2 increased. Optimal values for L1-L2 and f2/f1 were derived from these data. In general, average DPOAE levels for the new L1-L2 and f2/f1 were equivalent to or larger than those observed for other stimulus combinations, including the L1-L2 described by and those defined by in which L1-L2 was evaluated, but f2/f1 was fixed at 1.2.
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机译：研究了20名正常听力受试者的初级水平差异（L1-L2）和初级频率比（f2 / f1）对失真产物耳声发射（DPOAE）水平的综合影响。在以下刺激条件下，DPOAE的刺激水平不断变化：f2 = 1、2、4和8 kHz，f2 / f1 = 1.05至1.4；各种L1-L2，包括经过单独优化以生产最大DPOAE的一种。对于低L2电平的宽间隔主频率，当L1远高于L2时记录到最大的DPOAE，随着L2的增加L1保持相对恒定。随着f2 / f1的减少，当 L 1 接近 L 2 时，最大的DPOAEs被观察到，并且随着 L 2 增加了。 L 1 - L 2 和 f 2 < / sub> / f 1 是从这些数据得出的。通常，新的 L 1 - L 2 和 f 2 / f 1 等于或大于其他刺激组合（包括 L < sub> 1 - L 2 的描述及其定义，其中 L 1 -<评估了em> L 2 ，但评估了 f 2 / f 1 固定为1.2。
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