04403184 is referenced by 19 patents and cites 7 patents.

A method and an apparatus for indicating in real time the occurrence of and measuring the frequency or period of the basic oscillation of a generally periodic unknown signal with statistically distributed spectral components is disclosed. Using an autocorrelation technique, the time interval from the initial peak value to the next successive peak value of the autocorrelation curve is measured and the unknown frequency or period is determined therefrom. A periodically occurring maximum of the next successive peak value is determined, and, on its appearance, a signal is produced, said signal approximating the occurrence in real time of the generally periodic signal.

Title
Autocorrelation apparatus and method for approximating the occurrence of a generally periodic but unknown signal
Application Number
20768
Publication Number
4403184
Application Date
March 18, 1982
Publication Date
September 6, 1983
Inventor
Erich Courtin
Herrenberg-Gultstein
DE
Rudiger Witt
Holzgerlingen
DE
Agent
Edward L Miller
Assignee
Hewlett Packard Company
CA, US
IPC
A61B 5/02
G01R 19/04
G01R 23/02
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