| 摘要 |
<p>A heart-sound detecting apparatus (10), comprising a heart-sound microphone (12, 16) 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 means (40) 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 (42) 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. <IMAGE></p> |
