Arlinger S D, Billermark E
Department of Audiology, University Hospital, Linköping, Sweden.
Scand Audiol. 1997;26(3):151-4. doi: 10.3109/01050399709074988.
Speech recognition thresholds (SRT) have been determined in two groups of subjects, one with normal hearing and one with various types and degrees of hearing loss. One ear was tested on each subject, using spondees as test-words, with Telephonics TDH-39 supraural earphones and EARTONE 3-A insert earphones. The mean difference in SRT using the two transducers was 1 dB and not statistically significant. No difference was seen between the two groups of subjects. We conclude that the two transducers, in spite of measurable differences in frequency response, are interchangeable. If an exact calibration of the insert earphone is to be made, the equipment should be adjusted to produce 1 dB lower test levels for the insert earphone than for the TDH-39 in standardized calibration set-ups.
已在两组受试者中测定了言语识别阈值（SRT），一组听力正常，另一组有各种类型和程度的听力损失。对每位受试者的一只耳朵进行测试，使用扬扬格词作为测试词，采用Telephonics TDH - 39 supraural耳机和EARTONE 3 - A插入式耳机。使用这两种换能器时SRT的平均差异为1 dB，且无统计学意义。两组受试者之间未观察到差异。我们得出结论，尽管这两种换能器在频率响应方面存在可测量的差异，但它们是可互换的。如果要对插入式耳机进行精确校准，在标准化校准设置中，设备应调整为使插入式耳机的测试水平比TDH - 39低1 dB。
