6.80 biological check; diagnostic listening. Listening and perceptually evaluating an acoustic signal to determine if the signal sounds normal.
Annotation Typically conducted on an 14.04 audiometer. Electronic instrument for measuring hearing sensitivity, specifically hearing levels, as a function of frequency.
Annotation 1 A manual audiometer is a pure-tone audiometer in which the signal presentations, frequency, hearing level selection, and recording of results are performed manually.
Annotation 2 A Bekesy audiometer is a pure-tone audiometer where hearing level variations are under the subject's control. Signal presentations, frequency selection or frequency variation, and recording of subject responses are implemented and recorded automatically.
Annotation 3 A computer-controlled audiometer is a pure-tone audiometer in which the test procedure is controlled by a computer.
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