Digital automatic frequency control method and circuit therefor

Details Digital automatic frequency control method and circuit therefor Digital automatic frequency control method and circuit therefor

1994-08-17

1996-05-07

Metjahic, Safet

Television

Flutter or jitter correction

Specified color

348540, 348536, 348520, 358320, H04N 989, H04N 944

Patent

active

055151086

ABSTRACT:
A digital automatic frequency controlling method and circuit therefor in which a digital horizontal sync signal is separated from an input horizontal sync signal in response to a system clock, a horizontal sync separation point value is extracted, an actual horizontal sync period is calculated by using the digital horizontal sync signal and the clock pulse number within one horizontal sync period, a line jitter amount is calculated by subtracting a standard horizontal sync period from the actual horizontal sync period, a correction coefficient in response to the line jitter amount is generated to modulo-operate a standard frequency down-converting carrier color signal and to thereby generate a new frequency down-converting carrier color signal having compensated line jitter.

REFERENCES:
patent: 4475244 (1984-10-01), Taylor
patent: 5394197 (1995-02-01), Kim
patent: 5412481 (1995-05-01), Ko et al.

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