Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1994-04-05
1996-06-04
Epps, Georgia Y.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
360 48, G11B 509
Patent
active
055239900
ABSTRACT:
An improved apparatus for detecting address information recorded on a recording medium such as an optical-magnetic disc is disclosed. The header information is recorded on each sector of the disc recording medium and is constituted by a sector mark indicating a head position of the corresponding sector, a plurality of address marks, and subsequent address information data. In a first preferred embodiment, a number of bytes starting from an end position of the address information and ending at a head position of the address information is counted and an address information recognition circuit is provided so as to provide an address information recognition start signal for the address information recognition signal at a predicted position of the head position. The address information recognition circuit extracts and recognizes the address information in accordance with the address information recognition start signal supplied from a recognition start signal generator when the address mark detecting circuit does not supply a head position detection signal. In a second preferred embodiment, a window signal used to detect the address mark is selectively changed according to the result of detection of the preceded sector mark and/or address information data.
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Epps Georgia Y.
Huber P. W.
Shaw, Jr. Philip M.
Sony Corporation
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