Digital disk recording and reproduction apparatus
US6324138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jun 23, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A meandering groove is formed in a digital disk (10) with a wobble signal that is wobbled to reproduce a clock signal. The wobble signal is read out by an optical head (26). An address detection circuit (40) detects an address signal that is multiplexed with the wobble signal. A PLL oscillation circuit (24) provides a clock signal in synchronization with the wobble signal. Data is modulated by a modulation circuit (16) according to the clock signal and a timing signal based on the address signal, and recorded on the digital disk (10). In reproduction, a RF signal in the wobble signal is converted into a digital signal by an A/D converter (42). The signal is demodulated by a demodulation circuit (44) for data output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.