Disc recording/reproducing system

Details Disc recording/reproducing system Disc recording/reproducing system

1994-04-26

1996-07-09

Hindi, Nabil Z.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369124, 369 50, G11B 700

Patent

active

055351867

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.

REFERENCES:
patent: 4819218 (1989-04-01), Bernard
patent: 5384671 (1995-01-01), Fisher
patent: 5412629 (1995-05-01), Shirane
Patent Abstracts of Japan (JP-A-02 023 552 dated Jan. 25, 1990), vol. 14, No. 167 (P-1031), 30 Mar. 1990.
Patent Abstracts of Japan (JP-A-04 186 562 dated Jul. 3, 1992), vol. 16, No. 511 (P-1441), 21 Oct. 1992.
Patent Abstracts of Japan (JP-A-05 151 715 dated Jun. 18, 1993), vol. 17, No. 550 (P-1624), 4 Oct. 1993.
Patent Abstracts of Japan (JP-A-05 205 277 dated Aug. 13, 1993), vol. 17, No. 637 (P-1650), 25 Nov. 1993.

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