Blood pulse detection method using autocorrelation

Details Blood pulse detection method using autocorrelation Blood pulse detection method using autocorrelation

1995-07-21

1996-09-24

Sykes, Angela D.

Surgery

Truss

Pad

128689, 128706, A61B 502

Patent

active

055580963

ABSTRACT:
A medical monitor determines the period of a physiological function, such as blood circulation pulses, by operating a probe that produces an electrical signal which corresponds to the physiological function. The electrical signal is digitized at a given sampling rate to acquire a plurality of signal samples which are stored in a memory. A time scaling factor is adjusted dynamically so that the amount of signal samples being processed does not exceed a maximum limit. The magnitude of the signal samples also may be scaled dynamically. Serial autocorrelation is applied to the signal samples to produce a sequence of summation values. The quantity of summation values from the initial one in the sequence to a peak summation value is determined. The physiological function period is derived from the quantity of summation values, the given sampling rate, and any time scaling factor that was used.

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patent: 4621643 (1986-11-01), New, Jr. et al.
patent: 5249576 (1993-11-01), Goldberger et al.
Lathi, B. P., "Modern Digital and Analog Communication Systems," Holt, Rinehart and Winston, Inc., Philadelphia, 1989, p. 105.

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