Television – Synchronization – Sync generation
Patent
1996-10-09
1998-06-23
Grant, Christopher C.
Television
Synchronization
Sync generation
348521, H04N 506
Patent
active
057710767
ABSTRACT:
The present invention relates to a device which generates a vertical synchronizing signal of video signals according to digital methods. The present invention is composed of a counter for receiving a first input signal and a system clock for counting the number of system clock cycles, and for producing a 9-bit counting signal; a first comparator for receiving the 9-bit counting signal, and comparing it with an upper limit number, and producing an output signal; a second comparator for receiving the 9-bit counting signal, and comparing it with a lower limit number, and producing an output signal; a feedback loop circuit for receiving the first input signal, the output signal of the first comparator, and the output signal of the second comparator, and producing a feedback signal to prevent outputs of the counter from exceeding or going below the upper and lower limit numbers, respectively; and a controller for receiving the most significant bit (MSB) of the 9-bit counting signal, system clocks, and a second input signal, and producing a vertical synchronizing signal in case the MSB is a low logic value when the counter counts system clock cycles in the descending direction from the upper limit number. The present invention permits the easy correction of a vertical synchronizing signal by providing a device which generates a vertical synchronizing signal of video signals by digital methods in correspondence to users' requests, and it can be not only to advance stability in the process by utilizing digital circuits, but also to uses lower consumption-current than conventional circuits.
REFERENCES:
patent: 4224639 (1980-09-01), Belisomi
patent: 4858008 (1989-08-01), Sieben et al.
patent: 5341217 (1994-08-01), Florsek
patent: 5635988 (1997-06-01), Hush
Grant Christopher C.
Samsung Electronics Co,. Ltd.
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