Patent ID: 6064638
Filing Date: 2000-05-16
Classification: G11B

Abstract:
A track count estimator for an optical storage device during a track seek operation, the optical storage device capable of operating in at least one of a CD-ROM mode and a DVD mode, the track count estimator comprising:modulo-1/2 difference logic, coupled to receive an estimator input signal represented by a state Z(k) and a modified track count signal represented by a state X.sub.1 (k.vertline.k-1), for generating an error signal ERR represented by a state Z(k)-X.sub.1 (k.vertline.k-1);a first adder, coupled to receive the error signal at a first input and the modified track count signal at a second input, for generating a signal represented by a state X.sub.1 (k.vertline.k);a first delay register, coupled to receive the signal generated by said first adder, for outputting a track count signal;a second adder, coupled to receive the error signal at a first input and second latch signal at a second input, for generating a signal represented by a state X.sub.2 (k.vertline.k);a second delay register, coupled to receive the signal generated by said second adder, for outputting the second latch signal represented by a state X.sub.2 (k.vertline.k-1); anda third adder, coupled to receive the track count signal at a first input and the second latch signal at a second input, for generating the modified track count signal.