| 摘要 |
In a synchronized digital horizontal deflection system operating at 2xfH, a digital phase-lock-loop circuit generates first fH rate signal that is synchronized to the horizontal sync pulses, and a second fH rate second signal that is delayed from the first signal by one-half of the period H. A digital phase-control-loop circuit receives the first and second signals and generates a horizontal deflection control signal at 2xfH rate that controls the retrace interval timing in a deflection circuit output stage. The synchronization of every other retrace interval occur in accordance with information provided by the first signal. |
