Optically readable record carrier with track undulations for pro

Details Optically readable record carrier with track undulations for pro Optically readable record carrier with track undulations for pro

1989-01-17

1990-11-20

Canney, Vincent P.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

G11B 700

Patent

active

049724010

ABSTRACT:
An optically readable record carrier for storing digitally coded information having a power spectrum with a substantially zero level at a predetermined frequency. The information is recorded on and/or reproduced from substantially parallel elongated tracks on the record carrier which have a periodic undulation at the aforesaid predetermined frequency. Such undulation generates a clock signal for synchronizing the recording and/or reproduction of the digitally encoded information on the tracks, and does not interfere with the recording or reproduction of such information. Apparatus is disclosed for forming such tracks on the record carrier.

REFERENCES:
patent: 3931460 (1976-06-01), Watson
patent: 4223347 (1980-09-01), Bouwhuis et al.
patent: 4392819 (1983-07-01), Yokozawa et al.

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