Apparatus for reproducing digitally coded information...

Details Apparatus for reproducing digitally coded information... Apparatus for reproducing digitally coded information...

G - Physics

11

B

352/32.1

G11B 7/00 (2006.01) G11B 7/005 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1163367

26-2-1980 1 PHN 9669 ABSTRACT: "Apparatus for reproducing digitally coded information recorded on an optically readable disc-shaped record carrier". Apparatus for reproducing digitally coded information recorded on a disc-shaped record carrier in the form of optically detectable information areas arranged in accordance with a concentric or spiral track pattern. These information areas are unit areas. The apparatus comprises a filter which is tuned to a frequency f=V/L, V being the nominal tangential speed of the record carrier and L the nominal centre-to-centre distance of said unit areas. This frequency component has a frequency equal to twice the bit frequency of the coded information and is situated at a zero point of the power spectrum of said information, so that the extracted signal may be employed for the generation of a clock signal.

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