Heart-sound detecting apparatus and pulse-wave-propagation-velocity-relating-information obtaining system using the heart-sound detecting apparatus
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United States of America Patent
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Jan 18, 2005
Grant Date -
Jan 9, 2003
app pub date -
Jul 2, 2001
filing date -
Feb 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heart-sound detecting apparatus, including: a heart-sound microphone which detects a plurality of heart sounds produced by a heart of a living subject and outputs a heart-sound signal representative of the detected heart sounds; a smoothing device for smoothing, by differentiation, a waveform of the heart-sound signal output from the heart-sound microphone; a squaring device for squaring an amplitude of the smoothed waveform with respect to a base line of the heart-sound signal; and a start-point determining device for determining a start point of a first heart sound I as one of the detected heart sounds, based on that the squared amplitude is greater than a prescribed threshold value.
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