Apparatus for reproducing digitally coded information recorded o

Details Apparatus for reproducing digitally coded information recorded o Apparatus for reproducing digitally coded information recorded o

1980-03-24

1982-04-20

Hecker, Stuart N.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

365215, 369124, G11C 1304, G11B 2504, G11B 2730

Patent

active

043262821

ABSTRACT:
Disclosed is an apparatus for reproducing digitally coded information recorded on a disc-shaped record carrier in the form of optically detectable, unit information areas arranged in accordance with a concentric or spiral track pattern. 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 center-to-center 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.

REFERENCES:
patent: 3501586 (1970-03-01), Russell
patent: 4238843 (1980-12-01), Carasso et al.

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