Tonndorf J, McArdle F, Kruger B
Acta Otolaryngol. 1976 Mar-Apr;81(3-4):330-6. doi: 10.3109/00016487609119970.
Losses (determined by measuring microphonic responses) were essentially identical, regardless of whether produced by admittance of sound into the middle ear via perforations in the tympanic membrane (TM) or in the bulla. With SPLs monitored directly at the TM, losses increased at 12 dB/oct with inverse frequency for f less than 1 kHz, a pattern determined by the changes in the (calculated) net sound pressure acting from front and back on the TM. Clinically, hearing losses due to TM perforations are frequency-independent. The difference between the two situations has mainly to do with the use of precalibrated SPLs in Clinical Audiometry.
损失（通过测量微音器反应来确定）基本相同，无论其是由声音经鼓膜（TM）穿孔或经中耳泡进入中耳所导致。在TM处直接监测声压级（SPL）时，对于频率低于1kHz的情况，损失随频率倒数以12dB/倍频程增加，这种模式由作用于TM前后的（计算出的）净声压变化所决定。临床上，由TM穿孔导致的听力损失与频率无关。这两种情况之间的差异主要与临床听力测定中使用预先校准的SPL有关。
