LX The Input Impedance of the Inner Ear in Cats

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Abstract
The input impedance of the inner ear of the cat was determined experimentally by comparing sound pressures acting upon the stapes footplate and the resulting volume velocities through the round window. It was assumed that the volume displacement of round and oval window should be approximately equal. The experiments were done with the stapes footplate in place and after its removal. In the 1st case the impedance curve decreased with 6 db [decibels]/octave, forming a minimum of 1 megohm at between 1000 and 2000 Hz [frequency]. After removal of the footplate, the impedance curve Increased with 6 db/octave, forming a maximum of 6 to 9 megohms at approximately 300 Hz. It Is estimated that these values may possibly be too high. However, the error should not be larger than a factor of three. Comparison of the impedance ratio Inner ear/middle ear and the transformer ratio of the middle ear appears to indicate that the cat''s ear is slightly undermatched, a conclusion which is supported by evidence derived from other unrelated experiments.

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