04456959 is referenced by 16 patents and cites 9 patents.

An autocorrelation function is computed for a value of a phase difference variable over a range determined by a set minimum period and a set maximum periods of one beat, corresponding to a maximum heart rate and a minimum heart rate, respectively. The maximum and minimum rates are estimated from a latest computed heart rate obtained from a preceding measurement of a heartbeat signal, by way of sampling the heartbeat signal at a predetermined sampling period and then using the data obtained from the sampling operation. The period of the heartbeat signal is computed from the computed autocorrelation function, and the sampling period is decided from the computed heartbeat signal period.

Title
Period measurement system
Application Number
6/281162
Publication Number
4456959
Application Date
July 7, 1981
Publication Date
June 26, 1984
Inventor
Masakazu Murase
Fujinomiya
JP
Toshinori Hirano
Fujinomiya
JP
Agent
Frishauf Holtz Goodman & Woodward
Assignee
Terumo Corporation
JP
IPC
G01R 23/02
A01B 5/04
G06F 15/42
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