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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

  • US 20020001390A1
  • Filed: 07/12/2001
  • Published: 01/03/2002
  • 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 at least one heart sound produced by a heart of a living subject and outputs a heart-sound signal representing the detected heart sound;

    a time-frequency analyzing means 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 means for determining a timing when an 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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