Frequency characteristics of the middle ear

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Abstract
For 68 temporal bones, frequency curves for the round window volume displacement were measured for a constant sound pressure at the eardrum. Phase curves were measured for 33 of the specimens. The level averaged amplitude curve is approximately flat below 1 kHz, where the round window volume displacement per unit sound pressure at the eardrum is 6.8 .times. 10-5 mm3/Pa[Pascal] and falls off by about 15 dB/octave at higher frequencies. For the 20 ears having the largest sound transmission magnitude at low frequencies, the corresponding amplitude curve is displaced about 5 dB towards higher levels. The phase of the round window volume displacement lags the eardrum sound pressure phase. In average for 33 temporal bones, the phase lag increase from 0 at the lowest frequencies to .pi. near 2 kHz and to about 1.5 .pi. at 10 kHz.

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