An Improved Cardiotachometer Input Circuit for Heart Rate Determination.
AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO
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Electronic data processing of electrocardiogram signals for determining heart rate requires signals with a minimum of interference and amplitude or wave form variations. In many environmental stress research experiments, the electrocardiogram signal is disturbed by movement artifacts, muscle action potentials, power line frequency interference, and other electrical noise sources. Computer programming techniques may be used to improve the accuracy of heart rate determinations under noise interference but requires valuable computer capability. A comparatively inexpensive cardiotachometer input circuit has been developed that delivers a standard pulse of constant width and amplitude for every R-wave of the electrocardiogram. The circuit may also be useful to improve accuracy and reliability of cardiotachometers and cardiac alarm devices. Detail function and operation description, performance tests, and results from on line application are presented in the report. Modified author abstract
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