| 摘要 |
PURPOSE: To generate a high-frequency pulse train which is synchronized to an input synchronizing pulse, and can be used for a television receiver, etc. CONSTITUTION: In a synchronous digital horizontal deflection system which operates at a frequency 2×fH, a digital phase locked loop circuit 20 generates a first signal CMa having a first frequency fH synchronized to a horizontal synchronizing pulse HS and a second signal CMb having a second frequency fH which is delayed by a half period H/2 from the first signal CMa. A digital phase controlled loop circuit 120 accepts the first and second signals CMa and CMb and generates a horizontal deflection control signal HORDRIVE which controls the timing of the retracing period of the output stage 41 of a deflection circuit. Synchronization is performed in every other retracing periods in accordance with the information given by the first signal CMa. |
