Burst locked oscillator with side-lock protection

Details Burst locked oscillator with side-lock protection Burst locked oscillator with side-lock protection

1987-03-02

1988-09-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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358 25, H04N 945

Patent

active

047696915

ABSTRACT:
A burst locked phase locked loop (PLL) includes a relatively wide-band voltage controlled oscillator. This PLL may erroneously lock at a frequency which differs form the frequency of burst by an amount equal to the horizontal line frequency. To prevent this side-locking condition, the PLL includes circuitry which changes the frequency of the signal produced by the VCO when the number of cycles of the signal provided by the PLL during one horizontal line interval corresponds to the number which would be obtained in a side-lock condition.

REFERENCES:
patent: 3532819 (1970-10-01), Lipoma et al.
patent: 3578902 (1971-05-01), Monsay
patent: 4255759 (1981-03-01), Ohmori et al.
patent: 4405937 (1983-09-01), Kudo
patent: 4456884 (1984-06-01), Yarborough, Jr.
patent: 4500909 (1985-02-01), Machida
patent: 4544943 (1985-10-01), Quan
patent: 4561014 (1985-12-01), Douziech et al.
patent: 4617520 (1986-10-01), Levine
"RCA Databook, CMOS Microprocessors, Memories and Peripherals", RCA Corporation, 10/84, pp. 706-711.

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