Hellström P A
Lindholmen Development Hearing Research Laboratory, Gothenburg, Sweden.
Hear Res. 1995 Aug;88(1-2):54-60. doi: 10.1016/0378-5955(95)00102-a.
The effects of individuals differences in sound transfer function (STF) from free sound field to the tympanic membrane on hearing levels was studied in the right and left ears of 55 young male and 45 young female subjects. Furthermore, canal volumes and lengths have been recorded. STFs were measured in 1/3-octave bands using a miniature microphone and an attached probe. STF measurements were performed in the 0.5-16 kHz frequency range. Audiograms were registered with linear frequency sweep from 0.25 to 8 kHz. Transfer function spectra and magnitudes as well as ear canal dimensions were compared to hearing levels. There was a significant relationship between the dimensions of the ear canal and hearing levels. Large, compared to small, ear canal volumes resulted in a shift of STFs towards lower frequencies. STF spectra and magnitudes had a significant effect on hearing levels. Subject with low-frequency-dominated STFs have higher hearing thresholds than subjects with lower magnitude STFs.
在55名年轻男性和45名年轻女性受试者的右耳和左耳中，研究了从自由声场到鼓膜的声音传递函数（STF）个体差异对听力水平的影响。此外，还记录了耳道容积和长度。使用微型麦克风和附带的探头在1/3倍频程频段测量STF。STF测量在0.5-16kHz频率范围内进行。使用从0.25至8kHz的线性频率扫描记录听力图。将传递函数谱和幅值以及耳道尺寸与听力水平进行比较。耳道尺寸与听力水平之间存在显著关系。与小耳道容积相比，大耳道容积导致STF向低频偏移。STF谱和幅值对听力水平有显著影响。以低频为主的STF受试者比幅值较低的STF受试者有更高的听力阈值。
