Streaming updates of central moments for heart rate variability quantification
AssigneeFujitsu Limited
InventorStergios STERGIOU
Life of this patent
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Abstract
A computer readable storage medium configured to cause a system to perform operations of computing the standard deviation of a plurality of K−1 most recent heart beat intervals and a current heart beat interval (I1) from a plurality of consecutive heart beat intervals, from a sum (S1) of K most recent heart beat intervals squared and the sum (S2) of the K most recent heart beat intervals and a Kth oldest heart beat interval (I2). The computer readable storage medium calculates an updated sum (S1′) of S1 minus I2 squared plus I1 squared and the updated sum (S2′) of S2 minus I2 plus I1, and a square root of the sum of the ratio of S1′ to K and of the ratio of the square of S2′ to the square of K.
Claims24
A computer readable storage medium configured to cause a system to perform operations of computing the standard deviation of a plurality of K−1 most recent heart beat intervals and a current heart beat interval (I1) from a plurality of consecutive heart beat intervals, from a sum (S1) of K most recent heart beat intervals squared and the sum (S2) of the K most recent heart beat intervals and a Kth oldest heart beat interval (I2), the method comprising:
- calculating an updated sum (S1′) of S1 minus I2 squared plus I1 squared and the updated sum (S2′) of S2 minus I2 plus I1, and a square root of the sum of the ratio of S1′ to K and of the ratio of the square of S2′ to the square of K.
A computer readable storage medium configured to cause a system to perform operations of computing the root-mean square of a plurality of K−1 most recent consecutive heart beat interval differences and a newly computed heart beat interval difference (D1) from a sum (Z1) of the squares of a K most recent heart beat interval differences and a Kth oldest heart beat interval difference (D2), the method comprising:
- calculating an updated sum (Z1′) of Z1 minus the square D2 plus the square of D1 and the square root of the ratio of Z1′ to K.
A system for performing heart rate variability quantification, the system comprising:
- a cardiac sensor configured to generate a data signal including multiple consecutive heart beat intervals of a subject;
- a computing device communicatively coupled to the cardiac sensor, the computing device configured to compute the standard deviation of a plurality of K−1 heart beat intervals previously received from the cardiac sensor and a current heart beat interval (I1) from the cardiac sensor from a sum (S1) of a K most recent heart beat intervals squared and the sum (S2) of the K most recent heart beat intervals and a Kth oldest heart beat interval (I2), the computing device being configured to:
- calculate an updated sum (S1′) of S1 minus I2 squared plus I1 squared and the updated sum (S2′) of S2 minus I2 plus I1, and a square root of the sum of the ratio of S1′ to K and of the ratio of the square of S2′ to the square of K.
A system for performing heart rate variability quantification, the system comprising:
- a cardiac sensor configured to generate a data signal including multiple consecutive heart beat intervals of a subject;
- a computing device communicatively coupled to the cardiac sensor, the computing device configured to compute the root-mean square of a plurality of K−1 most recent consecutive heart beat interval differences received from the cardiac sensor and a current heart beat interval difference (D1) received from the cardiac sensor from a sum (Z1) of the squares of a K most recent heart beat interval differences and a Kth oldest heart beat interval difference (D2), the computing device being configured to:
- calculate an updated sum (Z1′) of Z1 minus the square D2 plus the square of D1 and the square root of the ratio of Z1′ to K.
Dependencies are inferred from the claim text.