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临床上常用Rinne氏试验区分传导性聋和感觉神经性聋。所用音叉频率常为128Hz或256Hz。但作者们发现128Hz音叉骨导声音较气导声音约高1个倍频程。为此作者们测试了128～4096Hz音叉气、骨导基音和泛音的强度和频率。气导是测音叉臂末端发出的声音;骨导是测音叉柄的纵向振动。结果频率高于512 Hz的音叉测不出泛音;而低频音叉发出的声音中含有泛音和谐音(harmonic),特别是128Hz音叉产生中等强度的256Hz和2278Hz的泛音。128Hz和256Hz的音叉柄的振动分别在256Hz和512Hz时强度最大,基频大于256Hz的音叉则无此现象。音叉末端的横向振动含有泛音而不是基音的谐音。柄的振动一方面由于音叉的变形,使柄偏离重心;另一方面由于音叉末端作圆周运动的离
Clinically, Rinne’s test is commonly used to distinguish between conductive deafness and sensory nerve deafness. The tuning fork frequency used is often 128Hz or 256Hz. However, the authors found that the 128 Hz tuning-fork sound was about 1 octave higher than the air-guide sound. To this end, the authors tested the intensity and frequency of 128- 4096 Hz fork gas, bone-conduction pitch and overtone. Air conduction is the sound emitted by the end of the sounding fork; the bone conduction is the longitudinal vibration of the sounding fork handle. The tuning fork whose result frequency is higher than 512 Hz can not be detected as an overtone, and the low frequency tuning fork contains overtone harmonics, in particular, the 128 Hz tuning fork produces moderate intensity overtones of 256 Hz and 2278 Hz. The vibrations of the tuning fork handle of 128Hz and 256Hz have the maximum intensity respectively at 256Hz and 512Hz, while the tuning fork with the fundamental frequency greater than 256Hz does not have this phenomenon. Transverse vibration at the end of the fork contains harmonics rather than pitch. Shaft vibration on the one hand due to the deformation of the tuning fork, so that the handle deviates from the center of gravity; on the other hand due to the end of the tuning fork for circular motion