Patent ID: 6999391
Filing Date: 2006-02-14
Classification: G11B

Abstract:
1. A disc driving device for recording and/or reproducing a disc-shaped recording medium, having a land and/or a groove formed thereon in a circling fashion for operating as a recording track, said recording track meandering depending on a wobble signal, comprising: wobble signal reproducing means for reproducing said wobble signal from said disc-shaped recording medium, said wobble signal containing digital information harmonic wave modulated (HMW) onto a sinusoidal carrier signal by adding even harmonics signals to said sinusoidal carrier signal and by changing the polarity of said harmonics signals according to said digital information; and demodulation means for demodulating said wobble signal to retrieve said digital information from said wobble signal; said demodulating means including a synchronization signal generating unit for generating said even harmonics signals and data clocks of said digital information from the wobble signal reproduced from said disc-shaped recording medium; a multiplication unit for multiplying the generated even harmonics signals with the wobble signal reproduced from the disc-shaped recording medium; an integrating unit for integrating an output signal of said multiplication unit for each data clock; and a verification unit for verifying the sign of the digital information based on an output value of said integrating unit at an end edge of said data clock.