A bit engine for digital video recording (DVR) on a 12 cm disc with 22 Gbytes user capacity and 50 Mbit/s data rate

摘要

At the joint ISOM/ODS in 1999 SONY and Philips proposed a new physical format for a third generation optical disc storage system: DVR, Digital Video recording [1]. The DVR system enables a storage capacity of at least 22 Gbytes with a data rate of 50 Mbit/s on a single layered re-writable optical disc [2,3]. The main ingredients of the DVR system are the use of a blue laser (400 nm wavelength) and a high numericla aperture (NA=0.85) objective lens. For this purpose a new rigid two-element glass-2P replicated aspherical objective has been developed. The DVR physical standard is based on phase change technology, allowing for removable media with high data throughput and long lifetime, and optical pickups of low complexity. All channel and servo electronics have been breadboarded, conforming to the physical format for DVR. In this paper we present an overview of the DVR bit engine and pay special attention to newly developed components, such as a general purpose laser driver IC, a plastic beam shaper and a collimator actuator for spherical aberratin contorl. We report the results of the format evalution using this bit engine, and we briefly mention the coupling to the video recording applicationlayer.