| 摘要 |
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.
|
