Circuit for generating a constant reference oscillation from a v

Details Circuit for generating a constant reference oscillation from a v Circuit for generating a constant reference oscillation from a v

1978-09-27

1980-09-02

Tupper, Robert S.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 360 36, H04N 5795

Patent

active

042209684

ABSTRACT:
A circuit for generating a constant reference oscillation from a video signal affected by a time error, comprising, a cut-off stage for receiving the video signal affected by the time error and outputting sync pulses and vertical sync pulses, a first frequency divider connected to the cutoff stage for receiving the vertical sync pulses and outputting divided frequency pulses and a first comparator stage connected to the first frequency divider for receiving the divided frequency pulses. The first comparator stage has an output connected to an oscillator and the oscillator, in turn, has an output connected to a second frequency divider which is also connected to an input of the first comparator stage. A second comparator stage is connected between the cutoff stage sync pulses and an output of the oscillator for producing an output and a clock oscillator is connected to the output and, in turn, is connected to a bucket chain which receives the video signal affected by the time error and outputs a video signal which is free of the time error.

REFERENCES:
patent: 3863022 (1975-01-01), Bruch
patent: 3984867 (1976-10-01), Harnandez
patent: 4005476 (1977-01-01), Dickopp et al.
patent: 4028729 (1977-06-01), Browder
patent: 4101940 (1978-07-01), Scholz

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