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在音叉测听年代,常规用高频率测试用具,先是Galton笛,以后有S truyken单音弦,后者无泛音失真,较前者为优。单音弦能作气导和骨导测试,气导测试时由于器械在耳部及耳道的位置不同而产生不同结果。一般说来,在年青健康人,频率的上限骨导为17～26kHz,气导为15～20kHz,用单音调测试时,骨导方法比气导有效,有助于老年聋的诊断和鉴别。有了电听力计后,由于耳机的事先校准,大于6～8 kHz的频率不可信而废弃,并认为听言语不过是300～2000Hz,定言语频率为500,1000,2000,高至8kHz已足够,降低了高频率测试的重要性。至60年代,对此始予否定,言语还有更高频率,更重要的是10kHz以上者,可提供听器早期病变,例如耳毒性药物,从组织学发现,首先是螺旋器基
In the tuning fork audiometry, conventional high-frequency test utensils, first Galton flute, later S truyken monosyllable, the latter without harmonic distortion, the former is better. Monosites can be used for air conduction and bone conduction testing, and air conduction tests result in different results due to the different positions of the instruments in the ear and ear canal. Generally speaking, in young healthy people, the upper limit of frequency of bone conduction is 17 ~ 26kHz and air conduction is 15 ~ 20kHz. When using single tone test, the bone conduction method is more effective than air conduction, which is helpful for the diagnosis and identification of senile deafness. With the electric audiometer, due to the earphone calibration in advance, the frequency of more than 6 ~ 8 kHz is not trusted and abandoned, and that the speech is nothing but 300 ~ 2000Hz, the speech language is 500,1000,2000, up to 8kHz is sufficient , Reducing the importance of high-frequency testing. By the 1960s, a negative response to this was due to a higher frequency of speech, and more importantly those over 10 kHz, which provided early lesions of the hearing aid, such as ototoxic drugs, from histological findings,