Method and apparatus for detecting specific signal pattern in a signal read from an optical disc

A signal pattern detecting module for detecting a physical mark in a read back signal being read from an optical disc, the signal pattern detecting module comprising:

• a plurality of signal pattern detecting apparatuses for respectively utilizing a plurality of matching signals, each capable of being utilized to identify the physical mark, to determine a location of the physical mark;
• and
• a decision logic electrically connected to the plurality of signal pattern detecting apparatuses for outputting an indication signal when the indication signal is toggled by any one of the plurality of signal pattern detecting apparatuses;
• wherein the plurality of matching signals correspond to different timing.

A method for detecting a physical mark in a read back signal being read from an optical disc, the method comprising:

• (a) generating a matching signal, capable of being utilized to identify the physical mark, according to a reference clock and a wobble clock;
• (b) comparing the matching signal with a wobble data signal to generate a comparison signal;
• and
• (c) determining if a period reaches a threshold value, the period corresponding to how long the comparison signal reaches a predetermined level within a predetermined period, and generating an indication signal corresponding to a location of the specific signal pattern if the period reaches the threshold value;
• wherein both the wobble data signal and the wobble clock are derived from the read back signal.