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Heart-sound detecting apparatus and pulse-wave-propagation-velocity-relating-information obtaining system using the heart-sound detecting apparatus

  • US 20030009108A1
  • Filed: 07/02/2001
  • Published: 01/09/2003
  • Est. Priority Date: 02/18/2000
  • Status: Active Grant
First Claim
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1. A heart-sound detecting apparatus, comprising 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 means for smoothing, by differentiation, a waveform of the heart-sound signal output from the heart-sound microphone;

    a squaring means for squaring an amplitude of the smoothed waveform with respect to a base line of the heart-sound signal; and

    a start-point determining means 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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