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40 decibels acoustic air conduction receiver alternate-loudness balance ambient noise ambient noise level amplifier attenuator audio audiogram audiology audiometer auditory rehabilitation auditory training battery better ear binaural bone conduction calibration child circuit clinical conductive deafness defective demonstrate DISCRIMINATION LOSS discrimination score ear insert equipment factors free field fricative function galvanometer germanium handicapped hard of hearing heard hearing aid hearing loss hears the tone individual instrument intensity left ear lip reading listening loss of hearing LOUDNESS CONTOUR measured meter microphone monaural deafness nasal noise level normal hearing observed obtained otologist pathology patient peep show perceptive deafness performed phonation phonemes phones pitch produce psychological pure tone audiometry quency recorded recruitment response right ear signal speaker speech audiometry speech patterns speech reading speech reception threshold speech sounds spondaic spondaic words stimulate switch tester tinnitus tion transistor usually vacuum tube vibrations vocal voice and speech vowels