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2OOO 4OOO acoustic amplifier audiogram audiometer average BAP curve basilar membrane calibration chart circuit circumaural earphones comfortable loudness pressures coupler damped wavetrain signal dB/octave decibels per octave deficient ear delivered diaphragm direct current distortion ear canal ear drum earmold electrical equal loudness graphs equal loudness pressures exist free-field pressure free-field sound pressure frequency response gain hearing deficiency hearing instru hearing instrument hearing loss indicate individual input pressure listener loudness sensation maximum deliverable pressure maximum tolerable pressure ment microbars microphone nerve normal ear obtained otometric otometric measurements output pinna prescription pressure limitation produce prosthetic pure tone signals quency ratio real pressures receiver relative represents REQUENCY Figure resonance shown in Figure shows sound pres sound pressure changes sound pressure cycles sound pressure level sound pressure signal specified speech sounds square wave stereophonic strument sure threshold pressures tion transistors usually variation zero