Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-03-26
1998-01-27
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 700
Patent
active
057128367
ABSTRACT:
Apparatus and method for reproducing data from a CD-ROM at a constant angular velocity and for recording and reproducing data to and from a magneto-optical compact disc (CD-MO) at a constant angular velocity. Data reproduced from the CD-ROM is demodulated in accordance with an amount of reproduction time of a sync signal contained in the reproduced data. The clock rate of data to be recorded to or reproduced from the CD-MO is determined in accordance with the position or zone on the CD-MO at which the data is to be recorded or from which it is reproduced. The position or zone may be identified by address data which is reproduced from the CD-MO. In addition, a constant rotational velocity of the CD-MO is maintained by measuring an amount of reproduction time of the address data and varying the rotational velocity of the CD-MO in accordance with the measured reproduction time.
REFERENCES:
patent: 4819218 (1989-04-01), Barnard
patent: 5253243 (1993-10-01), Suzuki
patent: 5412629 (1995-05-01), Shirane
Kamoto Hidetoshi
Wachi Shigeaki
Frommer William S.
Sinderbrand Alvin
Sony Corporation
Young W. R.
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