Circuit requiring only four integrated circuits (IC's) measures both heart rate and breath rate. Phase-locked loops lock on heart-rate and respiration-rate input signals. Each loop IC contains two phase comparators. Positive-edge-triggered circuit used in making monitors insensitive to dutycycle variations.
Heart-Rate and Breath-Rate Monitor
NASA Tech Briefs ; 7 , 3
01.08.1983
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Englisch