Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1981-10-23
1989-02-21
Cardillo, Raymond F.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 44, 369275, G11B 7095, G11B 7007
Patent
active
048072141
ABSTRACT:
An apparatus for recording and/or reproducing information in and/or from an optically inscribable and readable disk-shaped record carrier with a pre-formed tracks with a track modulation constituted by a radial wobble, in order to obtain a tracking signal. A reference signal for deriving the tracking signal by synchronous detection is obtained by rectifying the difference signal which is the difference between the signals supplied by the two photo-detectors disposed on opposite sides of a line which extends in the track direction, by subsequently extracting the component of twice the frequency via a phase-locked loop and by frequency-dividing the signal, so that phase shifts of 180.degree. in the difference signal do not affect the synchronous detection.
REFERENCES:
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4326282 (1982-04-01), Verbloom et al.
patent: 4366564 (1982-12-01), de Haan et al.
patent: 4375088 (1983-02-01), de Haan et al.
Cardillo Raymond F.
Garland Steven R.
Tamoshunas Algy
U.S. Philips Corporation
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