Patent ID: 7345963

Claim:
A method for deriving a tracking error signal in an optical storage system comprising: (a) receiving an optical beam reflected and refracted via a recording carrier, the optical beam propagating along a track direction on the recording carrier according to the tracking error signal; (b) after proceeding with step(a), according to a plurality of received different portions of the optical beam in space, generating a first analog detection signal and a second analog detection signal, wherein there is a time difference between the first analog detection signal and the second analog detection signal; (c) after proceeding with step(b), respectively transforming the first analog detection signal and the second analog detection signal into a first digital detection signal and a second digital detect signal; (d) after proceeding with step(b), summing the first analog detection signal and the second analog detection signal to generate an analog sum signal; (e) after proceeding with step(d), applying a delay operation to the analog sum signal to be a delay signal; (f) after proceeding with step(e), digitalizing the delay signal into a digital delay signal; and (g) after proceeding with step(e) and step(f), respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal.