Patent ID: 7512043
Filing Date: 2009-03-31
Classification: G11B

Abstract:
1. An apparatus for generating a tracking error signal, the apparatus comprising: an optical sense module for generating a first analog signal and a second analog signal according to the signal reflected from an optical disc; an ADC (Analog-to-Digital Converter) module coupled to the optical sense module for translating the first and second analog signals into a first and a second digital signals respectively; a delay module coupled to the ADC module for delaying the first and second digital signals to generate a first and a second delay signals respectively; and a signal generation module coupled to the ADC module and the delay module for generating the tracking error signal according to the first and second digital signals and the first and second delay signals, the signal generation module comprising: wherein the digital logic module generates the tracking error signal according to the first and the second control signals, and the digital logic module enables the first or the second control signal when a value of one of the first and second digital signals and the first and second delay signals is different from values of the others of the first and second digital signals and the first and second delay signals.