Apparatus for inscribing and/or reading a record carrier

Details Apparatus for inscribing and/or reading a record carrier Apparatus for inscribing and/or reading a record carrier

G - Physics

11

B

352/32.1

G11B 7/08 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1193722

16 ABSTRACT: "Apparatus for inscribing and/or reading a record carrier". An apparatus for inscribing and/or reproducing information in and/or from an optically inscribable and readable disk-shaped record carrier with a pre-formed track pattern, in which a first track modulation constituted by a radial wobble is formed, in order to obtain a tracking signal. A reference signal for deriving a tracking signal via synchronous detection is obtained by rectifying a difference signal which is the difference between the signals supplied by two photo-detector halves disposed on both sides of a dividing line which extends in the track direction, by subsequently extracting the component of twice the frequency via a phase-locked loop and by fre- quency-dividing said signal, so that phase shifts of 180° in said difference signal do not affect the synchronous detection.

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