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BAs1c E1 EcrRrcA1 PRINCIPLES AND HEARING INSTRUMENTS
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acoustic ampliﬁer audiogram audiometer average BAP curve basilar membrane calibration chart circuit circumaural earphones comfortable loudness pressures coupler current ﬂow damped wavetrain signal decibels decibels per octave deﬁcient ear deﬁnes deﬁnite delivered direct current distortion ear canal ear drum earmold earphone electrical equal loudness graphs equal loudness pressures exist ﬁeld ﬁrst ﬂat ﬂuctuating free-ﬁeld sound pressure frequency response gain hearing deﬁciency hearing instru hearing instrument hearing loss indicate input pressure listener loudness sensation maximum deliverable pressure maximum tolerable pressure ment microbars microphone nerve normal ear obtained octave otometric otometric measurements output prescription pressure limitation produce prosthetic pure tone signals quency ratio real pressures receiver reﬂection relative represents scientiﬁc 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 pressure tion transistors usually zero