NASA NTRS · 19770000094
Differential sound-level meter
Abstract
Relative difference between sound-levels at two different microphone sites is measured precisely with circuit that continuously monitors gains of two acoustical channels. Difference between two pilot voltages is utilized in regulating loop to force gain of second channel to track gain of first channel.
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Zuckerwar, A. J.. 1977-06-01. Differential sound-level meter. https://ntrs.nasa.gov/citations/19770000094
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