Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-07-09
2000-02-29
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, G11B 700
Patent
active
060318015
ABSTRACT:
A disc playback apparatus for playing back a disc on which data have been recorded under a CLV control is provided with a CLV control section for performing a CLV control, a speed comparator and a reference clock generator for performing a CAV control, a changeover switch for switching between the CLV control and the CAV control, and a CPU for setting a switching point of the changeover switch and controlling the switching of the changeover switch. According to another aspect of the invention, switching is made between a playback with a CLV servo control and a playback with a CAV servo control in accordance with the reproduction scanning position in the disc radial direction. In particular, a difference between disc rotation speeds at the disc innermost and outermost tracks is made smaller than that in a case where a playback is performed at a specific linear velocity over the disc entire area. According to a further aspect of the invention, regions are set by dividing the disc entire area in the disc radial direction. A judgment is made of a region to which a current reproduction scanning position belongs, and control is made so as to switch the playback linear velocity in accordance with the region thus determined. In particular, a difference between disc rotation speeds at the disc innermost and outermost tracks is made smaller than that in a case where the linear velocity is not changed over the disc entire area.
REFERENCES:
patent: 5528574 (1996-06-01), Takeuchi et al.
Hachimori Takeshi
Ishikawa Hideki
Okabe Mitsuru
Frommer William S.
Smid Dennis M.
Sony Corporation
Tran Thang V.
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