ear. Because of this impedance mismatch, 99.9% of sound waves from the air would be reflected if they acted directly on the inner ear fluids, resulting in inefficient transfer of sound stimuli from the external
The purpose of this system of bones is both to amplify the sound from the outer ear, and to impedance match the pressure energy. The impedance matching is necessary to transition from the air medium in the outer ear to the fluid medium in the inner ear. View chapter Book 2018, ...
A final way to potentially reduce the impedance mismatch underwater is through a reduced round window area (Fig. 1b-iv), making the ear impedance closer to that of the water; but, such an effect would also likely reduce aerial sensitivity. Some of these reversals, such as a lower ...
Actuator impedance is generally greater than middle ear impedance. A clinical study with the Carina system, however, did not show any significant shift in auditory thresholds after device implantation.34 An experimental study with a stack piezo-actuator found less than 10-dB loss in METF.27 The...
This high reflection is due to an impedance mismatch between the air of the outside environment and the fluid of the cochlea. The middle ear plays an important role of impedance matching to decrease reflections and increase the amount of sound energy entering the cochlea. The impedance match of...