Recording medium having a pilot signal with an aligned phase ang

Details Recording medium having a pilot signal with an aligned phase ang Recording medium having a pilot signal with an aligned phase ang

1980-03-31

1982-01-26

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 50, 369 61, 369109, 3581285, G11B 724, G11B 1924, G11B 2336

Patent

active

043131913

ABSTRACT:
A recording medium, such as a light-reflective video disc, having a plurality of substantially parallel information tracks, each track formed by a succession of spaced, information-bearing indicia having reduced reflectivity. Each track records both a modulated carrier signal and a pilot signal, the pilot signal having a prescribed frequency substantially lower than a substantial portion of the modulated carrier signal. The duty cycle of the spaced indicia forming each track varies in accordance with the phase angle of the recorded pilot signal, and the pilot signal's phase angle is aligned with itself on adjacent tracks.

REFERENCES:
patent: 3796825 (1974-03-01), Redlich et al.
patent: 4018984 (1977-04-01), Keizer
patent: 4223187 (1980-09-01), Yonezawa et al.
patent: 4223347 (1980-09-01), Bouwhuis

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