Method and apparatus for detecting fetal heart rate by autocorrelation
November 5, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3157781 3717756 Apparatus for refining signals derived from fetal heartbeats Instantaneous frequency measurement system Apparatus for measuring the period and frequency of a signal Cardiotachometer using autocorrelation techniques Volatile dispensing composition and method Autocorrelation apparatus and method for approximating the occurrence of a generally periodic but unknown signal Dedicated correlator Patent #: 4494213 InventorAssigneeApplicationNo. 06/668031 filed on 11/05/1984US Classes:600/511, Fetal heartbeat600/453Doppler effect (e.g., fetal HR monitoring)ExaminersPrimary: Kamm, William E.Assistant: Shein, Mitchell J. Attorney, Agent or FirmInternational ClassesG06F 17/00 (20060101)A61B 8/02 (20060101) G01S 7/52 (20060101) AbstractA 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.Other References
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