Patent ID: 7224651

Claim:
A method of detecting a wobble address from an optical recording medium, in which first address information indicating physical identification information is phase modulated using a first wobble signal and recorded in one of two walls of either of a groove track and a land track, and second address information is phase modulated using a second wobble signal having a predetermined phase relation with the first wobble signal and recorded in the other wall, in an optical recording and reproducing system having an optical detecting device, the method comprising: providing first and second output signals, each having an original signal component and a harmonic component, by multiplying a difference signal between radially half-divided detection signals of the optical detecting device by the first and second wobble signals having the predetermined phase relation, respectively; and removing the harmonic component from the first and second output signals and recovering the first address information and the second address information from the corresponding original signal component having a phase component.