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History and Development of Hearing Aids
Vacuum Tube Instruments
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2-cc coupler Acoust Soc aided thresholds appropriate audiogram Audiol audiologists audiology audiometric auditory battery Berger binaural amplification binaural hearing aids Carhart chapter child client clinical clinician compression CROS CROS hearing aid deaf decibels differences distortion ear canal earmold effects electroacoustic electroacoustic characteristics factors feedback frequency response frequency/gain functional gain Harford head shadow hearing aid fitting hearing aid performance hearing aid selection hearing aid users Hearing Disorders hearing impairment Hearing Instruments hearing loss hearing-impaired hearing-impaired children high-frequency input insertion gain KEMAR listening low-frequency Lybarger marketing measurements method mold monaural noise normal output patient person practice prescriptive problem procedures professional real-ear resonance selective amplification sensorineural sensorineural hearing loss soundfield specific speech discrimination Speech Hearing Disorders Speech Hearing Res speech intelligibility speech perception speech signal speech spectrum tion unaided unilateral hearing loss vacuum tube vent volume control