Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1994-10-31
1997-06-17
Nelms, David C.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 13, 369 4426, G11B 700
Patent
active
056403836
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: 4967403 (1990-10-01), Ogawa
patent: 5034938 (1991-07-01), Yokogawa
patent: 5148422 (1992-09-01), Sako
patent: 5345435 (1994-09-01), Yamasaki
Kamoto Hidetoshi
Wachi Shigeaki
Frommer William S.
Mai Son
Nelms David C.
Sinderbrand Alvin
Sony Corporation
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