Apparatus for reading an optically coded disc-shaped record...

G - Physics – 11 – B

Patent

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Details

CPC

352/32.2

IPC codes

G11B 7/095 (2006.01) G11B 7/005 (2006.01) G11B 20/00 (2006.01) G11B 27/00 (2006.01) G11B 27/13 (2006.01) G11B 27/30 (2006.01)

Type

Patent

Patent number

CA 1214549

Description

ABSTRACT: Apparatus for reading an optically coded disc-shaped record carrier. The invention relates to an apparatus for reading a dish-shaped record carrier with a spiral information track in which an optically readable digitally coded in- formation signal is recorded with a spatial bit frequency which is independent of the radius of the track turn. The scanning speed of the information track is selected to be a factor n higher than the scanning speed normally employed for the reproduction for the recorded information. By means of a memory device information blocks being read and comprising a fixed number of data bits are time- expanded to restore the customary time relationship. A control unit determines the read-in cycles of the memory device for the storage of the information blocks being read and, via the radial positioning system for the read spot, it determines the scanning pattern of the record carrier so that the ultimately recorded information blocks are reproduced in the same sequence and at the desired rate.

Application Number

449091

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