NASA NTRS · 19850000160
Frequency-Discriminating Acoustic-Event Counter
Abstract
Broadband events rejected. Acoustic-event counter discriminates against signals that simultaneously exceed preset amplitude thresholds in both low and high-frequency bands of its spectrum. Counter acts as spectral analyzer for mechanical vibrations. In combination with broadband acoustic transducer discriminates between signals and noise in acoustical destructive or nondestructive testing, vibration monitoring for machinery, burglar alarms, and other monitoring/warning systems.
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Sugg, F. E., Graham, L. J.. 1985-10-01. Frequency-Discriminating Acoustic-Event Counter. https://ntrs.nasa.gov/citations/19850000160
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