HEART-SOUND DETECTING APPARATUS, SYSTEM FOR MEASURING PRE-EJECTION PERIOD BY USING HEART-SOUND DETECTING APPARATUS, AND SYSTEM FOR OBTAINING PULSE-WAVE-PROPAGATION-VELOCITY-RELATING INFORMATION BY USING HEART-SOUND DETECTING APPARATUS
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United States of America Patent
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-
Nov 5, 2002
Grant Date -
Jan 3, 2002
app pub date -
Jul 12, 2001
filing date -
Feb 18, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heart-sound detecting apparatus, including a heart-sound microphone which detects at least one heart sound produced by the heart of a living subject and outputs a heart-sound signal representing the detected heart sound, a time-frequency analyzing device for analyzing, with respect to time and frequency, at least a portion of the heart-sound signal that includes a first heart sound I, and an aortic-valve-opening-timing determining device for determining a timing when the aortic valve of the heart opens, based on a time when a magnitude of the analyzed signal at a frequency higher than a frequency range of a main component present in an initial portion of the first heart-sound I is greater than a prescribed threshold value.
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