Cox R M
J Acoust Soc Am. 1986 Jan;79(1):120-3. doi: 10.1121/1.393634.
A transformation was derived to convert sound-pressure levels referenced to an NBS-9A coupler to corresponding eardrum sound-pressure levels. It was found that the same transformation may be used for male and female adults and for both TDH-39 and TDH-49 earphones in MX-41/AR supra-aural cushions. It was determined that from 250-2000 Hz the transformation provides an eardrum sound-pressure level estimate that is within 6 dB of the actual eardrum level for 95% of individuals. However, in the 4000-6300-Hz range, the accuracy deteriorates to +/- 12 dB of actual eardrum level for 95% of individuals.
推导出一种变换，用于将参考NBS-9A耦合器的声压级转换为相应的鼓膜声压级。结果发现，相同的变换可用于成年男性和女性，以及MX-41/AR耳垫中的TDH-39和TDH-49耳机。经测定，在250至2000赫兹范围内，该变换得出的鼓膜声压级估计值与95%的个体的实际鼓膜声压级相差在6分贝以内。然而，在4000至6300赫兹范围内，对于95%的个体，精度降至实际鼓膜声压级的正负12分贝。
