Synchronization of spontaneous otoacoustic emissions to a 2f1-f2 distortion product.
Synchronization of spontaneous otoacoustic emissions to a 2f1-f2 distortion product.
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自发耳声发射与 2f1-f2 失真产物的同步。
DOI：
10.1121/1.399734
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
H. Wit
中科院分区：
文献类型：
--
作者：
P. van Dijk;H. Wit
已经研究了自发耳声发射与三次失真频率 fs = 2f1-f2 的同步。由频率为 f1 和 f2 的两个主音组成的刺激可以很容易地从麦克风信号中滤除。这使我们能够通过记录麦克风信号的过零时刻来监控相对于同步频率 fs 的发射相位。当初级声音足够响亮（通常为 30 dB SPL）时，相位围绕恒定值波动：发射始终与 fs 同步。降低主电平（通常为 20 dB SPL）会导致随机时刻发生 2 个 pi 相位跳跃：发射有时会不同步，试图保持其自身的固有频率 f0。这种行为可以描述为在存在噪声的情况下振荡器（频率 f0）与正弦力（频率 fs）的同步。
Synchronization of spontaneous otoacoustic emissions to a cubic distortion frequency fs = 2f1-f2 has been studied. Stimulus, consisting of two primary tones at frequency f1 and f2, could easily be filtered out of the microphone signal. This enabled us to monitor emission phase with respect to synchronization frequency fs, by recording zero-crossing moments of the microphone signal. When primaries were sufficiently loud (typically 30 dB SPL), phase fluctuated around a constant value: The emission was constantly synchronized to fs. Lowering primary levels (to typically 20 dB SPL) resulted in 2 pi-phase jumps at random moments: The emission occasionally slipped out of synchronization, trying to maintain its own natural frequency f0. This behavior can be described as synchronization of an oscillator (frequency f0) to a sinusoidal force (frequency fs) in the presence of noise.