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
First Claim
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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Accused Products
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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Citations
12 Claims
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1. A heart-sound detecting apparatus, comprising:
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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. - View Dependent Claims (3, 5, 6, 7, 8)
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2. A heart-sound detecting apparatus, comprising:
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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 of the subject opens, based on a time when at least one magnitude of the analyzed signal at at least one frequency in a frequency range of a main component present in an initial portion of the first heart-sound I is minimal. - View Dependent Claims (4, 9, 10, 11, 12)
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Specification