| 摘要 |
A H-sync phase locked loop device for TV video signal is provided herein. After the TV video signal is digitalized, clamping and slicing operations are performed on the digitalized TV video signal to respectively generate a clamped signal and a sliced signal. According to the clamped signal and the sliced signal, an H-sync frequency calculator can calculate the falling and rising transients of the H-sync signal and an H-sync frequency is obtained therefrom. Because the H-sync frequency is dynamically adjusted according to the input TV video signal, the phase locking of the input TV video signal can tolerate more deviations of the H-sync by replacing a predetermined H-sync frequency. |
