NASA NTRS · 19660000153
Phonocardiograph system monitors heart sounds
Abstract
Phonocardiograph system monitors the mechanical activity of the heart in extreme environments. It uses a piezoelectric-crystal microphone with an integral preamplifier, and a signal conditioner having special frequency characteristics. The output signals can be recorded on tape, presented aurally, or transmitted telemetrically to a remote station.
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1966-04-01. Phonocardiograph system monitors heart sounds. https://ntrs.nasa.gov/citations/19660000153
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