The occasional opening of the Eustachian tube is necessary to equalize the air pressure in the middle ear cavity with outside air. The auditory canal is the channel through which the sounds are led from the ear outside to the middle ear. It functions to reinforce sound and provide protection for the eardrum. Eyeglass -Amplification devices in the form of eyeglass frames are available. These instruments are designed for wearers who wear eyeglasses and for whom conventional hearing instruments are not practical.
Pitch is the psychological response to frequency.
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