Heart-sound detecting apparatus and pulse-wave-propagation-velocity-relating-information obtaining system using the heart-sound detecting apparatus
First Claim
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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Accused Products
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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Citations
8 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification