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A-weighted acoustic Air Conduction American National Standards ANSI attenuation audiogram audiometer audiometric testing audiometry auditory bone conduction calibration cause Chapter characteristics cochlea compensation damage decibels determine diagnosis ear canal ear protectors eardrum earphones earplugs effective employees equipment Eustachian tube example factors Figure hearing conservation program hearing impairment hearing level hearing testing hearing threshold important individual industrial hearing infection inner ear instrument intense noise lb/sq ft loss of hearing loud malingering material ment microphone middle ear N.R. dB nerve deafness noise control noise exposure noise levels noise measurement noise reduction noise source noisy normal hearing O.B. Hz occupational deafness occupational hearing loss octave band otitis media otological otologist otosclerosis patient performed presbycusis present pressure levels procedure produced protection pure tones quency range record response result sound level meter sound power sound pressure sound-pressure level specific speech test tone tester tinnitus tion usually vibration