Patent ID: 6141303
Filing Date: 2000-10-31
Classification: G11B

Abstract:
In an optical storage device for recording digital data, a quadrature signal generator for generating a quadrature seek signal in response to a light-beam reflected off of an optical storage medium, the light-beam generated by an optical transducer, the quadrature signal generator comprising:(a) a photodetector, responsive to the reflected light-beam, for generating first and second position signals S1 and S2;(b) a correlator for correlating the first and second position signals S1 and S2 to generate a correlation signal indicative of the light-beam crossing data tracks recorded on the optical storage medium; and(c) a velocity detector, responsive to the correlation signal, for detecting a track crossing velocity of the light-beam crossing the data tracks and for adjusting a correlation length of the correlator in response to the detected velocity.