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acoustic alternating current amplifier audiogram audiometer average BAP curve basilar membrane calibration chart circuit comfortable loudness pressures coupler CYCLES PER SEC0ND damped wavetrain signal dB/octave decibels per octave deficient ear delivered diaphragm direct current distortion ear canal ear drum earmold earphone electrical equal loudness graphs equal loudness pressures exist free-field sound pressure frequency response gain hearing deficiency hearing instru hearing instrument hearing loss indicate input pressure intra-aural earphone listener loudness sensation maximum deliverable pressure maximum tolerable pressure ment microbars microphone nerve normal ear obtained otometric otometric measurements output prescription pressure in decibels pressure limitation produce prosthetic pure tone signals quency ratio real pressures receiver relative represents shown in Figure shows sound cycle 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 zero