Compensation for line frequency variation

Details Compensation for line frequency variation Compensation for line frequency variation

1990-12-24

1993-10-12

Harvey, Jack B.

Boots, shoes, and leggings

355207, H03K 519

Patent

active

052531791

ABSTRACT:
A method and apparatus for compensating for variations in input line frequency from the nominal line frequency. The method and apparatus utilize the difference between the number of zero crossings at the input line frequency and at the nominal frequency for a predetermined period of time to compensate for any variation in the input line frequency in order to synchronize timing related events.

REFERENCES:
patent: 4420809 (1983-12-01), Pierce
patent: 4601568 (1986-07-01), Takano et al.
patent: 4914680 (1990-04-01), Tanno et al.
patent: 4993052 (1991-02-01), Hammelsbacher
patent: 5107523 (1992-04-01), Heaney et al.
Barry Rickett, "Method of Eliminating Magnification Errors", Xerox Disclosure Journal, vol. 14, No. 5, Sep./Oct. 1989, pp. 249-250.

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