Period measurement system

Details Period measurement system Period measurement system

1981-07-07

1984-07-31

Malzahn, David H.

Boots, shoes, and leggings

364487, 128704, G01R 2302

Patent

active

044634250

ABSTRACT:
A period measurement system adapted to sample a biosignal at a predetermined sampling period, find an autocorrelation function for a variable .tau. from the sampled biosignal, and then find an autocorrelation function corresponding to the value of a phase difference variable obtained by changing the variable .tau. along a time axis. An autocorrelation function found in this manner is stored in memory and then compared with a subsequent-found autocorrelation function. The comparison operation is repeated for successive autocorrelation functions, thereby to find a peak of autocorrelation functions to measure the period of the biosignal.

REFERENCES:
patent: 4037151 (1977-07-01), Takeuchi
patent: 4054862 (1977-10-01), Backman, Jr.
patent: 4239048 (1980-12-01), Steuer
IEEE Transactions on Bio-Medical Engineering, vol. BME-15, No. 1, Jan. 1968, New York, (US), J. H. Van Bemmel, "Detection of Weak Foetal Electrocardiograms by Autocorrelation and Crosscorrelation of Envelopes", pp. 17 to 23.
IEEE Transactions on Bio-Medical Engineering, vol. BME-13, No. 1, Jan. 1966, New York, (US), A. G. Favret et al., "Evaluation of Autocorrelation Techniques for Detection of the Fetal Electrocardiogram", pp. 37 to 43.
IEEE Proceedings A, vol. 128, No. 8, Nov. 1971, Hitchin Herts, (GB), C. H. Sande et al., "Aid to Diagnoisis of Foetal Bradicardias Using the Autocorrelation Function", pp. 571 to 575.
Takeuchi, Y. and Hogaki, M., "An Adaptive Correlation Ratemeter: A New Method for Doppler Fetal Heart Rate Measurements", Ultrasonics, vol. 16, No. 3, pp. 127-137, May 1978.
Clark, J. S. B. and Filshie, J. H., "Autocorrelation Techniques for Measuring Avian Heart Rates", Med. & Biol. Eng. & Comput., vol. 15, pp. 656-665, Nov. 1977.

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