PULSE WAVE PERIOD MEASURING APPARATUS, PULSE WAVE PERIOD MEASURING METHOD, HEARTBEAT PERIOD MEASURING METHOD, AND RECORDING MEDIUM
First Claim
1. A pulse wave period measuring apparatus comprising:
- a pulse wave detecting unit configured to detect a pulse wave of a subject;
a value detecting unit configured to detect a maximum value and a minimum value in a predetermined period of the pulse wave;
a reference value calculating unit configured to calculate one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave;
a time calculating unit configured to calculate two or more times in the predetermined period, the time calculating unit calculating the two or more times at which the pulse wave intersects with the one or more reference values;
a pulse wave period calculating unit configured to calculate a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave;
a variation calculating unit configured to calculate a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period; and
a stability calculating unit configured to calculate, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods.
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Abstract
A pulse wave period measuring apparatus according to an embodiment of the present invention detects a pulse wave of a subject, detects a maximum value and a minimum value in a predetermined period of the pulse wave, calculates one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave, calculates two or more times in the predetermined period, the apparatus calculating the two or more times at which the pulse wave intersects with the one or more reference values, calculates a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave, calculates a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period, and calculates, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods.
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Citations
20 Claims
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1. A pulse wave period measuring apparatus comprising:
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a pulse wave detecting unit configured to detect a pulse wave of a subject; a value detecting unit configured to detect a maximum value and a minimum value in a predetermined period of the pulse wave; a reference value calculating unit configured to calculate one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave; a time calculating unit configured to calculate two or more times in the predetermined period, the time calculating unit calculating the two or more times at which the pulse wave intersects with the one or more reference values; a pulse wave period calculating unit configured to calculate a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave; a variation calculating unit configured to calculate a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period; and a stability calculating unit configured to calculate, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pulse wave period measuring method comprising:
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detecting a pulse wave of a subject; detecting a maximum value and a minimum value in a predetermined period of the pulse wave; calculating one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave; calculating two or more times in the predetermined period, the method calculating the two or more times at which the pulse wave intersects with the one or more reference values; calculating a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave; calculating a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period; and calculating, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods. - View Dependent Claims (16)
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17. A computer readable recording medium which records a program causing a computer to execute a pulse wave period measuring method, the method comprising:
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sampling pulse wave data from a pulse wave of a subject; detecting a maximum value and a minimum value in a predetermined period of the pulse wave; calculating one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave; calculating two or more times in the predetermined period, the method calculating the two or more times at which the pulse wave intersects with the one or more reference values; calculating the time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave; calculating a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period; and calculating, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods. - View Dependent Claims (18)
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19. A heartbeat period measuring method comprising:
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sampling heartbeat data from a heartbeat of a subject; detecting a maximum value and a minimum value in a predetermined period of the heartbeat; calculating one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the heartbeat; calculating two or more times in the predetermined period, the method calculating the two or more times at which the heartbeat intersects with the one or more reference values; calculating the time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a heartbeat period of the heartbeat; calculating a variation of heartbeat periods, for two or more heartbeat periods calculated between the predetermined period and the last period before the predetermined period; and calculating, based on the variation of the heartbeat periods, the stability of measuring the heartbeat periods. - View Dependent Claims (20)
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Specification