Track-jump control system and method for maintaining track-jump stability

A track-jump control system applied in an optical disc drive, the optical disc drive further comprising a pick-up head (PUH) for writing/reading information to/from an optical disc, the optical disc drive doing a track-jump when the PUH reads the data in different track of the optical disc, the track-jump control system being used for controlling the track-jump, comprising:

• a signal generator coupled to the PUH, for receiving a signal from the PUH and generating a tracking signal and a position signal;
• a protection device coupled to the signal generator, for receiving the position signal and when the position signal that represents the PUH passes a predetermined position of the optical disc, the protection device generating a protection signal;
• a velocity estimator for estimating the velocity of the PUH according to the tracking signal, then generating a velocity signal;
• and
• a controller coupled to the protection device and the velocity estimator, for
• receiving the velocity signal and the protection signal,
• protecting the velocity signal according to the protection signal, and
• generating a control signal to control the optical disc drive doing the track-jump according to the protected velocity signal.