Pulse measurement device, pulse measurement method, and pulse measurement program
First Claim
1. A pulse measurement device comprising:
- a data obtainment unit configured to obtain a pulse wave signal expressing a pulse by detecting a pulse of a measurement subject using a pulse wave sensor;
a storage unit configured to store the pulse wave signal;
a frequency conversion unit configured to convert the pulse wave signal in a time-domain stored in the storage unit to a frequency spectrum in a frequency domain, the frequency spectrum having variable intensity with respect to frequency change and covering at least a predetermined total frequency range W, the predetermined total frequency range W covering possible pulse rates of a person;
a rest state determination unit configured to determine that the measurement subject is at rest when (i) an exceeding frequency range within the predetermined total frequency range W is found, wherein the exceeding frequency range is a range where an intensity of a frequency component of the frequency spectrum exceeds a first threshold, and when (ii) a ratio of a width of the exceeding frequency range with respect to a width of the total frequency range W is found to be less than a second threshold; and
a pulse rate obtainment unit configured to find a pulse rate from a point in time when the measurement subject has been determined to be at rest as an at-rest pulse rate of the measurement subject.
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Accused Products
Abstract
A pulse wave signal expressing a pulse is obtained by detecting a pulse of a measurement subject using a pulse wave sensor. The pulse wave signal is stored in a storage unit. A frequency spectrum of the pulse wave signal is found by converting the time-domain pulse wave signal stored in the storage unit into the frequency domain. It is determined whether or not the measurement subject is at rest by finding a frequency range, within a predetermined total frequency range the pulse rate of a person can take on, in which an intensity of a frequency component of the frequency spectrum exceeds a first threshold, and finding whether or not a ratio of the frequency range with respect to the total frequency range is less than a second threshold. A pulse rate from the point in time when the measurement subject has been determined to be at rest is found as the measurement subject'"'"'s at-rest pulse rate.
37 Citations
11 Claims
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1. A pulse measurement device comprising:
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a data obtainment unit configured to obtain a pulse wave signal expressing a pulse by detecting a pulse of a measurement subject using a pulse wave sensor; a storage unit configured to store the pulse wave signal; a frequency conversion unit configured to convert the pulse wave signal in a time-domain stored in the storage unit to a frequency spectrum in a frequency domain, the frequency spectrum having variable intensity with respect to frequency change and covering at least a predetermined total frequency range W, the predetermined total frequency range W covering possible pulse rates of a person; a rest state determination unit configured to determine that the measurement subject is at rest when (i) an exceeding frequency range within the predetermined total frequency range W is found, wherein the exceeding frequency range is a range where an intensity of a frequency component of the frequency spectrum exceeds a first threshold, and when (ii) a ratio of a width of the exceeding frequency range with respect to a width of the total frequency range W is found to be less than a second threshold; and a pulse rate obtainment unit configured to find a pulse rate from a point in time when the measurement subject has been determined to be at rest as an at-rest pulse rate of the measurement subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pulse measurement method comprising:
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a step of obtaining a pulse wave signal expressing a pulse by detecting a pulse of a measurement subject using a pulse wave sensor and storing the pulse wave signal in a storage unit; a step of converting the pulse wave signal in a time-domain stored in the storage unit to a frequency spectrum in a frequency domain, the frequency spectrum having variable intensity with respect to frequency change and covering at least a predetermined total frequency range W, the predetermined total frequency range W covering possible pulse rates of a person; a step of determining that the measurement subject is at rest when (i) an exceeding frequency range within the predetermined total frequency range W is found, wherein the exceeding frequency range is a range where an intensity of a frequency component of the frequency spectrum exceeds a first threshold, and when (ii) a ratio of a width of the exceeding frequency range with respect to a width of the total frequency range W is found to be less than a second threshold; and a step of finding, as an at-rest pulse rate of the measurement subject, a frequency indicating a maximum intensity peak among intensity peaks contained in the frequency spectrum when it has been determined that the measurement subject is at rest. - View Dependent Claims (11)
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Specification