DISC DRIVING DEVICE AND WOBBLE INFORMATION DETECTION METHOD

摘要

In an optical disc, a wobble signal is to be detected by a simple configuration. In the optical disc, the address information, modulated onto a sinusoidal carrier signal by adding even harmonics signals to said sinusoida l carrier signal and by changing the polarity of said harmonics signals, is formed into the wobble signal. In detecting the wobble signal from the optic al disc to demodulate the address information, in a method for detecting the wobble signal, an even harmonics signal and data clocks are generated, and t he even harmonics signal so generated are multiplied with the reproduced wobble signal. The resulting product signal is integrated every data clock. The sig n of the digital information is verified based on the integrated value at an e nd edge of the data clock.