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

Abstract

A track-jump control system and method are provided. The track-jump control system applied in an optical disc drive comprises a signal generator, a protection device, a velocity estimator, and a controller. The signal generator receives the signal from the PUH and generates a tracking signal and a position signal. The protection device receives the position signal and when the position signal represents the PUH pass a predetermined position of the optical disc, the protection device generates a protection signal. The velocity estimator estimates the velocity of the PUH according to the tracking signal, and then generates a velocity signal. The controller receives the velocity signal and the protection signal, protects the velocity signal according to the protection signal, and generates a control signal to control the track-jump according to the protected velocity signal.

1 . 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 the 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 represents the PUH pass an 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 track-jump according to the protected velocity signal.  
   
   
   
       2 . The track-jump control system according to  claim 1 , wherein the velocity signal overlapped with the protection signal is masked to be replaced with a previous velocity signal.  
   
   
       3 . The track-jump control system according to  claim 1 , wherein the velocity signal overlapped with the protection signal is masked to be bypassed.  
   
   
       4 . The track-jump control system according to  claim 1 , wherein a mask duration for masking the velocity signal is determined by the velocity of the PUH at a time the masking begins.  
   
   
       5 . The track-jump control system according to  claim 1 , wherein a mask duration for masking the velocity signal is held until next velocity signal comes in.  
   
   
       6 . The track-jump control system according to  claim 1 , wherein the predetermined position is selected at least one from the group consisted of a header and a land/groove switch point.  
   
   
       7 . The track-jump control system according to  claim 6 , wherein the protection device further receives the tracking signal and reshapes the tracking signal started from where the L/G switch point according to the position signal.  
   
   
       8 . The track-jump control system according to  claim 7 , wherein the protection device further receives the tracking signal and inverts the tracking signal by 180 degrees started from where the L/G switch point according the position signal.  
   
   
       9 . 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 the signal from the PUH and generating a tracking signal and a position signal;    a signal re-shaper coupled to the signal generator, for receiving the position signal and the tracking signal, and when the position signal represents the PUH pass a land/groove (L/G) switch point of the optical disc, reshapes the tracking signal to generate a re-shaped tracking signal started from where the L/G switch point according the position signal; and    a controller for generating a control signal to control the track-jump according to the re-shaped tracking signal.    
   
   
       10 . The track-jump control system according to  claim 9 , wherein the tracking signal is inverted by 180 degrees by the signal re-shaper.  
   
   
       11 . The track-jump control system according to  claim 9 , further comprising a velocity estimator couple to the signal re-shaper and the controller, the velocity estimator for estimating the velocity of the PUH according to the re-shaped tracking signal, then generating a velocity signal for the controller to generate the control signal accordingly.  
   
   
       12 . A track-jump control method applied in a optical disc drive, the optical disc drive further comprising a pick-up head (PUH) for writing/reading information 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 method being used for controlling the track-jump, comprising: 
 receiving the signal from the PUH and generating a tracking signal and a position signal;    when the position signal represents the PUH pass a predetermined position of the optical disc, generating a protection signal;    estimating the velocity of the PUH according to the tracking signal, then generating a velocity signal;    receiving the velocity signal and the protection signal;    masking the velocity signal according to the protection signal; and    generating a control signal to control the track-jump according to the protected velocity signal.    
   
   
       13 . The track-jump control method according to  claim 12 , wherein the velocity signal overlapped with the protection signal is masked to be replaced with a previous velocity signal.  
   
   
       14 . The track-jump control method according to  claim 12 , wherein the velocity signal is masked to be bypassed.  
   
   
       15 . The track-jump control method according to  claim 12 , wherein a mask duration for masking the velocity signal is determined by a seek velocity of the PUH at a time the masking begins.  
   
   
       16 . The track-jump control method according to  claim 12 , wherein a mask duration for masking the velocity signal is held until next tracking signal comes in.  
   
   
       17 . The track-jump control method according to  claim 12 , wherein the predetermined position is selected at least one from the group consisted of a header and a land/groove (L/G) switch point.  
   
   
       18 . The track-jump control method according to  claim 17 , further comprising the following step: 
 reshaping the tracking signal started from where the L/G switch point according the position signal.    
   
   
       19 . The track-jump control method according to  claim 18 , wherein the tracking signal is inverted by 180 degrees.  
   
   
       20 . A track-jump control method applied in an optical disc drive, the optical disc drive further comprising a pick-up head (PUH) for writing/reading information 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: 
 receiving the signal from the PUH and generating a tracking signal and a position signal;    when the position signal represents the PUH pass a land/groove (L/G) switch point of the optical disc, reshapes the tracking signal to generate a re-shaped tracking signal started from where the L/G switch point according to the position signal; and    generating a control signal to control the track-jump according to the re-shaped tracking signal.    
   
   
       21 . The track-jump control method according to  claim 20 , wherein the tracking signal is inverted by 180 degrees.  
   
   
       22 . The track-jump control system according to  claim 20 , further comprising estimating the velocity of the PUH according to the re-shaped tracking signal, then generating a velocity signal for generate the control signal accordingly.