Device for CD reproduction with variable speed or direction
US6477123B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1998 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Mar 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a device for CD reproduction with variable speed or direction, in particular devices compatible with a CD player, such as, for example, DVD players which are likewise suitable for the playback of CDs, or corresponding CD-ROM drives. The invention is based on the fact that the data or information read from the CD are read into a buffer memory at a rate which, as a rule, is higher than is required for real-time reproduction. Data read into the buffer memory (RAM) in a continuous sequence are then used for CD reproduction with variable speed by means of subsampling or oversampling. For the purpose of reverse reproduction, groups of subcode words are successively read from the buffer memory by changing the order within the groups and are reproduced as a continuous reproduction data stream. Preferably, assemblies present in a reproduction device are used for CD reproduction with variable speed or direction and an improved comprehensibility of the reproduced information and also more accurate finding of a desired reproduction position are achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.