Disc recording/reproducing system
US5535186A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Apr 26, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc recording/reproducing system where recording/reproduced data rates change stepwise when spiral record tracks on a disc medium are divided in multiple zones in the radial direction and the disc is rotated and driven at a constant angular velocity or when a rotating and driving angular velocity changes stepwise for every zone, the disc recording/reproducing system is provided with a data rate control area provided at the boundary between a first and second zones on the disc medium for controlling the recording/reproduced data rate, a control area detecting device for detecting the data rate control area when continuously recording/reproducing data extends over the first and second zones and a frequency controller means for controlling the frequency of a recording/reproducing data extracting PLL or a recording reference frequency generating PLL when the data rate control area is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.