System for measuring physical parameter utilizing vibration transmission
First Claim
1. A physical parameter measuring system comprising:
- an exciter applying oscillations to a subject;
a sensor monitoring the oscillations propagated through the subject to provide a signal indicative thereof in sequence;
a phase detector detecting a phase of the signal outputted from said sensor to map, in sequence, the signal on a two-dimensional plane as a sample point and providing a sample point signal indicative thereof;
an A/D converter converting the sample point signal into a digital sample point signal in sequence;
an arc center determining circuit determining a center of an arc defined by a distribution of the sample points mapped for a given period of time, the arc center determining circuit including a sample group selecting circuit selecting the sample points which are located at an interval greater than a given reference sample-to-sample distance to form a sample group consisting of at least three of the selected sample points, and a circle center determining circuit determining a center of a circle passing through the sample group as the center of the arc; and
a phase angle determining circuit determining a phase angle of the sample point as viewed from the arc center determined by said arc center determining circuit and providing it as a parameter used to determine a physical parameter of the subject.
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Accused Products
Abstract
A physical parameter measuring system is provided which measures a physical parameter such as a blood pressure of a person using oscillation transmission. The system includes a phase detector, an A/D converter, an arc center determining circuit, and a phase angle determining circuit. The phase detector detects a phase of a sensor signal produced, in sequence, by monitoring oscillations which are applied by an exciter and transmitted through a living body to map the signal on a two-dimensional plane as a sample point. The A/D converter converts the sample point signal into a digital sample point signal in sequence. The arc center determining circuit determines a center of an arc defined by a distribution of the sample points mapped for a given period of time. The arc determining circuit selects the sample points which are located at an interval greater than a given reference sample-to-sample distance to form a sample group consisting of at least three of the selected sample points and determines a center of a circle passing through the sample group as the center of the arc. The phase angle determining circuit determines a phase angle of the sample point as viewed from the arc center determined by the arc center determining circuit and provides it as a parameter used to determine a physical parameter of the subject.
10 Citations
20 Claims
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1. A physical parameter measuring system comprising:
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an exciter applying oscillations to a subject;
a sensor monitoring the oscillations propagated through the subject to provide a signal indicative thereof in sequence;
a phase detector detecting a phase of the signal outputted from said sensor to map, in sequence, the signal on a two-dimensional plane as a sample point and providing a sample point signal indicative thereof;
an A/D converter converting the sample point signal into a digital sample point signal in sequence;
an arc center determining circuit determining a center of an arc defined by a distribution of the sample points mapped for a given period of time, the arc center determining circuit including a sample group selecting circuit selecting the sample points which are located at an interval greater than a given reference sample-to-sample distance to form a sample group consisting of at least three of the selected sample points, and a circle center determining circuit determining a center of a circle passing through the sample group as the center of the arc; and
a phase angle determining circuit determining a phase angle of the sample point as viewed from the arc center determined by said arc center determining circuit and providing it as a parameter used to determine a physical parameter of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A physical parameter measuring method comprising the steps of:
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applying oscillations to a subject;
monitoring the oscillations propagated through the subject to provide a signal indicative thereof in sequence;
detecting a phase of the signal to map, in sequence, the signal on a two-dimensional plane as a sample point and providing a sample point signal indicative thereof;
converting the sample point signal into a digital sample point signal in sequence;
determining a center of an arc defined by a distribution of the sample points mapped for a given period of time, said arc determining step including selecting the sample points which are located at an interval greater than a given reference sample-to-sample distance to form a sample group consisting of at least three of the selected sample points, and determining a center of a circle passing through the sample group as the center of the arc; and
determining a phase angle of the sample point as viewed from the arc center determined by the arc center determining circuit and providing it as a parameter used to determine a physical parameter of the subject. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification