Patent ID: 7057982

Claim:
A type of servo error detector, comprising: the servo error detector for an optical disk has one or several RF signals output from an optical pickup input to detect the position error or optical servo error of a light beam on the signal recording surface of the optical disk; the servo error detector for the optical disk has the following means: an envelope detector that detects the top envelope and/or bottom envelope of each said RF signal and generates a top envelope signal and/or a bottom envelope signal that represents said top envelope and/or bottom envelope; an analog/digital converter means that converts said analog top envelope signal and/or bottom envelope signal to a digital top envelope signal and/or bottom envelope signal; and a servo error signal generator that performs a digital operation treatment for said digital top envelope signal and/or bottom envelope signal to generate one or several servo error signals, wherein said analog/digital converter simultaneously samples plural analog top envelope signals and/or bottom envelope signals, and, using a time-division system, converts them to plural digital top envelope signals and/or bottom envelope signals.