Virtanen H
Acta Otolaryngol. 1978 Jul-Aug;86(1-2):93-103. doi: 10.3109/00016487809124724.
The sound conduction method for measurement of the Eustachian tube opening has been studied and modifications made in the test procedure to increase its easy performance and reliability. By holding the sound source near to the nostril, mounting the microphone into a circumaural ear defender and by feeding the output of the microphone through a filter with a very narrow bandwidth (3.16 Hz) many of the pitfalls of the sound conduction technique described earlier could be removed. Recording of the transfer function between the nasal tip and external auditory meatus and recording of the spectrum of swallowing sound revealed that the useful frequency rang for the measurements was upwards from 5--6 kHz. By using the three frequencies 6, 7 and 8 kHz the method showed tubal opening in 90 or 95% of normal ears depending on whether the minimum amplitude accetped was greater than or equal to 5 or 1--4 dB, respectively.
对用于测量咽鼓管开口的声音传导方法进行了研究，并对测试程序进行了改进，以提高其操作简便性和可靠性。通过将声源靠近鼻孔、将麦克风安装在环绕式耳罩中，并将麦克风的输出通过带宽非常窄（3.16赫兹）的滤波器，早期描述的声音传导技术的许多缺陷可以消除。鼻尖与外耳道之间传递函数的记录以及吞咽声音频谱的记录表明，测量的有用频率范围是从5-6千赫兹向上。通过使用6、7和8千赫兹这三个频率，该方法在90%或95%的正常耳朵中显示出咽鼓管开口，这取决于接受的最小幅度分别是大于或等于5分贝还是1-4分贝。
