Disc-shaped optically readable record carrier used as a data...

Details Disc-shaped optically readable record carrier used as a data... Disc-shaped optically readable record carrier used as a data...

G - Physics

11

B

352/32.2

G11B 7/00 (2006.01) G11B 7/007 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1143474

15.12.78 1 PHN 9283 ABSTRACT Disc-shaped optically readable record carrier used as a data storage medium. A disc-shaped record carrier having an infor- mation track which is divided into a plurality of sec- tors per track circumference. Each sector is divided into a data section, in which the data can be recorded, and a synchronizing section. This synchronizing section consists of an optically detectable relief structure and comprises an indicator portion and an address por- tion. The address portion contains the information about the track number and the sector number. The in- dicator portion serves to define the beginning of the address portion unambiguously and for this purpose has such a relief structure that the indicator signal pro- duced after cooperation with the radiation beam has a frequency which is clearly distinguishable from signal components resulting rfrom the address portion.

338976

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