04569356 is referenced by 17 patents and cites 10 patents.

A fetal heartbeat signal detected by the principle of an ultrasonic Doppler effect is autocorrelated, and a fetal heart rate is detected from the periodicity of peaks of a determined autocorrelation function. In such a process, peaks of the autocorrelation function are detected, and a peak truly indicative of the fetal heart rate is detected from closeness of righthand inclindations of the peaks to a righthand inclination of the origin of the autocorrelation function.

Title
Method and apparatus for detecting fetal heart rate by autocorrelation
Application Number
6/668031
Publication Number
4569356
Application Date
November 5, 1984
Publication Date
February 11, 1986
Inventor
Shigeyuki Kyozuka
Tokyo
JP
Agent
Hoffmann Dilworth Barrese & Baron
Assignee
Nihon Kohden Corporation
JP
IPC
A61B 5/04
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