Memory disc addressing device

Details Memory disc addressing device Memory disc addressing device

G - Physics

11

B

352/21.21

G11B 19/10 (2006.01) G11B 5/55 (2006.01) G11B 7/00 (2006.01)

Patent

CA 1152638

PHN. 9348. ABSTRACT A device for determining a complete track number or address of a track which forms part of a set of tracks present on a disc-shaped record carrier. The set consist of (n) groups of tracks, each group having (Sg) tracks. The record carrier is divided into alternate sectors of data tracks and sectors of servo tracks, each track within a servo sector comprising its own track number within its on a positioning member. The device comprises a first means for forming a complete track number, composed of firstly the track number read in a group and secondly a trial group number which is formed in a second means and which is variable in an increasing or decreasing sense. Third means are present for determining the difference be- tween a complete track number formed in the first means and a complete track number estimated in a fourth means on the basic of the displacement speed of the positioning mem- ber body. A fifth means is used to compare the magnitude determined by half (Sg) and a signal is produced if this magnitude is smaller than half (Sg), this signal validating the complete track number present in the first means at the relevant instant.

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