Title: Measurement averaging counting apparatus employing a randomly phase modulated time base to improve counting resolution

Abstract: A measurement averaging counting apparatus employing a randomly phase modulated time base provides resolution improvement when measuring an applied signal comprising time intervals or pulsed frequencies repetitively occurring at rates synchronous to a counter's clock frequency. The phase of a reference frequency is varied in response to a random signal. The phase modulated reference frequency is applied to a frequency multiplier chain which multiplies both the frequency and the effective amount of phase modulation. The randomly phase shifting output of the frequency multiplier chain is applied as a clock signal to a measurement averaging counter thereby destroying coherence between the clock signal and the applied signal and allowing statistical averaging to take place.

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Inventors: Gliever, John H. (San Jose, CA, US)
Chu, David C. (Woodside, CA, US)

Application Number: 496510
Filing Date: 1974-08-12
Publication_date: 1976-02-10
Assignee: Hewlett-Packard Company (Palo Alto, CA)
Primary Class(es): 368/118 324/76.47, 324/76.55, 324/76.82, 331/78, 377/43, 702/79, 968/846, 968/DIG1
Other Classes:
US Patent Ref:

3159801	Dec, 1964	Wiedemann	332/30.
3165707	Jan, 1965	Clapper	331/78.
3581191	May, 1971	Anderson	324/.
3675148	Jul, 1972	Edwards	331/78.
3816765	Jun, 1974	Goyer	331/78.

Other Refs:
Primary Examiner: Kominski, John
Assistant Examiner:
Attorney: Park; Theodore S.