Patent ID: 7433292

Claim:
An optical disk system comprising at least one photo detector comprising several sub-detectors for detecting at least a part of said optical disk, said several sub-detectors of said at least one photo detector generating respective detection signals in response to said detection, each of said respective detection signals being output to only one of several circuits of the optical disk system, each circuit having an input directly coupled to a respective output of only one of said several sub-detectors for receiving said detection signals, said several circuits comprised of at least one amplifier for amplifying detection signals and comprising at least one slicer for slicing amplified detection signals, the system further comprising at least one delay-difference detector for detecting delay differences in sliced amplified detection signals, characterized in that said delay-difference detector is delaylineless and comprises combinatorial-logic circuits and sequential-logic circuits ,said combinatorial-logic circuits for receiving output signals from said several sub-detectors and for generating signal pairs to be supplied to one of a first pair or a second pair of sequential logic circuits, said sequential logic circuits generating sequential logic circuit output signal pairs to be supplied directly to at least one analog adder/subtractor for adding/subtracting said sequential logic circuit output signal pairs.