Nielsen L H, Popelka G R, Rasmussen A N, Osterhammel P A
Department of Otolaryngology, Head & Neck Surgery, University Hospital, Copenhagen, Denmark.
Scand Audiol. 1993;22(3):159-64. doi: 10.3109/01050399309047462.
Parametric variations in the ratio of primary-tone frequencies were explored to optimize the amplitude of the 2f1-f2 distortion product otoacoustic emission for clinical purposes. Ten ears from 5 normally hearing human subjects were examined with primary tones geometrically centred around the standard audiometric frequencies of 0.5, 1, 1.5, 2, 3, 4, 6 and 8 kHz. The distortion product at the frequency 2f1-f2 (f1 < f2) was measured at six probe tone frequency ratios (f2:f1) varying between 1.15 and 1.40 using equal level primaries of 75 dB SPL. The results showed that a single f2:f1 ratio between 1.20 and 1.25 provides a reasonable value for clinical use in that it optimizes the magnitude of the distortion product at 2f1-f2, provides for sufficient resolution in the test frequency range, and is applicable to the standard clinical test frequencies.
为了临床应用的目的，研究了基频频率比的参数变化，以优化2f1-f2畸变产物耳声发射的幅度。对5名听力正常的人类受试者的10只耳朵进行了检查，使用几何中心位于0.5、1、1.5、2、3、4、6和8 kHz标准听力测试频率周围的基频。在六个探头音频率比（f2:f1）下测量频率为2f1-f2（f1 < f2）的畸变产物，频率比在1.15至1.40之间变化，使用75 dB SPL的等强度基频。结果表明，1.20至1.25之间的单一f2:f1比率为临床应用提供了合理的值，因为它优化了2f1-f2处畸变产物的幅度，在测试频率范围内提供了足够的分辨率，并且适用于标准临床测试频率。
