Abstract
A method is reviewed for conversion of a microphone signal into calibrated SPL units. The method follows ANSI standard S1.4 (SPL meters) published by the Acoustical Society of America, and requires an accurate SPL meter and a stable calibration sound source for conversion. Accuracy and validation data from test signals and human phonation are provided. The results indicate that under typical speech conditions, an absolute accuracy of plus or minus 1.6 dB (Type 1 SPL meter) can be obtained with a miniature head-mounted microphone.

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