Optical disk signal processing method and optical disk device
US6195320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and a device of processing a signal to solve the problem that a multi-bit and high-speed A/D converter for converting an analog regenerated signal into a digital signal on an optical disk is costly. In the method of processing a signal using a sum signal (22) or a difference signal (7) of a plurality of electric signals detected by an optical detection unit (4), an ID signal and a recording signal contained in the sum signal or the difference signal are selected and time-multiplexed, the polarity of the ID signal is adjusted to the polarity of the recording signal, the DC levels of the polarity-adjusted ID signal and recording signal are controlled and maintained at a constant level, and a series of the polarity- and DC-level-adjusted signals are A/D converted. Thus, the dynamic range of the multiplexed signal is reduced, and both the sum and the difference signals are digitized by a single A/D converter having the minimum number of bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.