Patent Number: 6,167,351

Title: Period determination of a periodic signal

Abstract: A method for determining the period of a periodic signal, possibly including noise, includes the step of calculating a signal representing the difference between the periodic signal, and the periodic signal delayed by a time T. The variance of the difference representative signal is then computed. The steps of computing a difference signal, and determining the variance of the difference signal is repeated for different times T. The period of the periodic signal is determined to be the time T producing the minimum variance. Apparatus implementing this method includes a source of the periodic signal. A difference circuit computes a signal representing the difference between the periodic signal, and the periodic signal delayed by a time T, and a variance circuit computes a signal representing the variance of the difference representative signal. A control circuit varies the time T. A minimum selector selects the time T producing the minimum variance as the period of the periodic signal.

Inventors: Onu; Dan (Lake Oswego, OR)

Assignee: Tektronix, Inc.

International Classification: G01R 23/02 (20060101); G01R 23/00 (20060101); G01R 13/34 (20060101); G01R 13/22 (20060101); G01R 025/00 (); G01R 029/02 (); G06F 019/00 ()

Expiration Date: 12/26/2017