Television – Synchronization – Sync separation
Patent
1996-10-30
1999-11-30
Lee, Michael H.
Television
Synchronization
Sync separation
348525, H04N 510, H04N 508
Patent
active
059951583
ABSTRACT:
A blanking signal generating control circuit for use in a video apparatus is disclosed. The blanking signal control circuit according to the present invention has structure which makes it easily adaptable for use with different broadcast standards, such as NTSC, PAL, SECAM, etc. The control circuit has an edge detector which generates a front edge detecting signal at the front edge of the vertical sync signal, and a rear edge detecting signal the trailing (or rear) edge of the vertical sync signal. The control circuit also has a field distinction signal generator for detecting odd and even fields in a video signal. A counting controller generates a counting control signal synchronized with the front edge detecting signal in response to the field distinction signal and a broadcasting system select signal. Line counting is performed starting from an initial value which is selected from a first or second initial value in response to the field distinction signal. Counting is done based on a pulse signal having a frequency of twice a horizontal synchronizing signal used as a clock signal, to generate a counted value. A comparator compares the counted value with a value which has been previously set to correspond to a selected broadcasting system; when the comparator indicates equality, a blanking signal is generated.
REFERENCES:
patent: 4357630 (1982-11-01), Odaka
patent: 4459612 (1984-07-01), Shinkai et al.
patent: 5012340 (1991-04-01), Kirschenstein
patent: 5467140 (1995-11-01), Sohn
patent: 5754251 (1998-05-01), Hulvey
Lee Michael H.
Samsung Electronics Co,. Ltd.
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