| 摘要 |
A jitter cancelling apparatus cancels both low and high frequency jitter in a carrier signal. The jitter cancelling apparatus has both a phase-locked-loop for cancelling lower frequency jitter and a predictive jitter canceller for cancelling higher frequency jitter. The jitter cancelling apparatus also has a control circuit which contains a jitter frequency measuring circuit for measuring jitter frequency. The control circuit determines whether the jitter cancelling circuit or the phase locked-loop is effectively operative according to whether the jitter frequency is above or below a predetermined value. |
