System and method for measuring signal deviation used in an optical recording/reproducing apparatus
US7397753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2005 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Jan 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0903
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for measuring the signal deviation are applied to an optical recording/reproducing apparatus. The optical recording/reproducing apparatus comprises an optical pickup head for receiving Differential Push Pull (DPP) signals reflected from an optical recording medium to trace the tracks on the surface of the optical recording medium. The DPP signal comprises a Main beam Push Pull (MPP) signal and a Sub-beam Push Pull (SPP) signal. The method firstly receives the MPP signal and the SPP signal to generate an MPP waveform and an SPP waveform separately. Then, the MPP waveform and the SPP waveform are combined to generate an amplitude waveform function. Finally, according to the amplitude waveform function, a phase difference between the MPP signal and the SPP signal is estimated. An adjusting direction can be further determined according to a relative position between the SPP waveform and the MPP waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.