Hearing aids: mechanical principles of the human ear, electrical principles of modern hearing aids and problems in design, together with a discussion of audiometry and other considerations pertaining to the adaptation of instruments to the various needs of the hard of hearing
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acoustic air conduction curve air conduction hearing air conduction receiver air pressure amount of sound audi audible audiogram illustrating audiometer basilar membrane bels bone conduction curve bone conduction receiver cochlea coil of wire components conduction hearing aid crystal microphone cycles per second deficient hearing device diaphragm ear canal ear drum electrical current electrical energy essentially Eustachian tube fluid frequency range frequency type fundamental hard of hearing hearing loss hearing mechanism hearing trumpet horn human ear impairment individual inner ear instru instrument intensity loudness scale maximum power output ment middle ear cavity nerve obtained octave Organ of Corti otologists oval window pitch principles quencies range of frequencies reach the ear relative requirements sound output sound power output sound waves speaking tube speech sounds stapes tests tion tones tube hearing aid types of hearing usually vacuum tube amplifier vacuum tube hearing variations of air various frequencies vibrations voltage volts