Rotational position controls for optical disk players using remo

Details Rotational position controls for optical disk players using remo Rotational position controls for optical disk players using remo

1987-10-02

1989-06-13

Sikes, William L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 1552, G11B 2722

Patent

active

048398772

ABSTRACT:
A record disk player removably receives for rotation a record disk having an index mark as the sole circumferential position indicator. A spindle in the player has a tachometer with marks angularly displaced a distance equal to the disk storing a predetermined number of bytes on the respective record tracks. A byte counter counts byte periods and is reset by each of the tachometer marks for indicating offset of the marks from the index signal. A register stores the offset as determined by the count in the segment counter at index time. A segment counter counts tachometer pulses for indicating which of the segments are currently being scanned on the record disk. The segment count when coupled with an offset indication provides true rotational position to a byte granularity. The index pulse resets the tachometer counter to zero. The tachometer counter has a modulus equal to the number of groups of bytes (segments) in each of the record tracks.

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