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air pressure amplified sound Articulation Index audible AUDIOGRAM FREQUENCY audiologist Audiology background noise batteries bone thresholds bone vibrator changes chapter clarity Clinics cochlea cochlear implant comfortable complex sound conductive loss consonants decibels depends ear canal eardrum earmolds earphones earwax efficiently Eustachian tubes faintest level fingers following audiograms FREQUENCY in Hz Furthermore graph shows hearing aid dispensers Hearing Level hearing problem hearing tests important in-the-ear inner ear levels of sound lips listen LOSS RANGE loud louder low-pitched lower-pitched measurement middle ear mild hearing loss mild loss movements need a hearing need hearing aids nerve hearing losses nerve loss normal conversation normal hearing Organ of Corti outer physician pitch pure tone right ear score screening test six decibels softer Sound Pressure Sound Pressure Level sounds we hear speech stronger talk talker tubes tympanogram understand various voice vowels word discrimination