Digital horizontal flyback control circuit

Details Digital horizontal flyback control circuit Digital horizontal flyback control circuit

1997-12-08

2000-03-07

Lee, Michael H.

Television

Synchronization

Automatic phase or frequency control

348541, H03L 700

Patent

active

060347368

ABSTRACT:
A digital horizontal flyback control circuit for controlling the horizontal position of a video signal on a monitor screen receives a horizontal drive signal (21) and a flyback signal (22) generated when a video display beam is caused to move from the end of one line of the display to the beginning of a next line by an edge of a pulse of the horizontal drive signal, the flyback pulse being delayed with respect to the horizontal drive signal pulse by a flyback delay period. A measuring circuit (15) measures the flyback delay period and a subtractor circuit (17) subtracts the flyback delay from a set horizontal position (18) representing a desired delay between the flyback pulse and a reference pulse (11). A comparator (19) compares the subtraction value with the value of a clock counter (23) whose count value is reset by the reference pulse (11) and produces a set signal at an output when the subtraction value and the clock count value are the same so as to generate the horizontal drive signal pulse (21).

REFERENCES:
patent: 5247229 (1993-09-01), Ngo et al.
patent: 5760839 (1998-06-01), Sumiyoshi

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