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absolute threshold acoustic adjust air conduction amplifier amplitude articulation score attenuation audible audiogram audiometer audiometry auditory fatigue auditory system Auditory Test basic basilar membrane binaural bone conduction capacitance cent Chap chapter circuit clinical audiometry clinician coil conditioning constant coupler curve cycles per second db SPL decibels device diagnostic different frequencies Discrimination Loss discussed ear canal earphone electrical energy equal loudness equal-loudness contours example experimental hearing aid Hearing Loss increase kinds listener lists Loss for Speech loud-speaker Loudness Level magnetic measurement of hearing method microphone monaural normal threshold observer obtained oscillator output over-all particular patient presented procedures produced Psychology psychophysical pure tones pure-tone recruitment relation resistance response S. S. Stevens scale Sensation Level shown in Fig shows signal sinusoidal skull specified spectrum speech audiometer speech sounds spondees standard stimulus technique threshold of intelligibility tion transducer variable vibration voltage vowel wave waveform white noise words