INRICHTING VOOR HET WEERGEVEN VAN DIGITALE INFORMATIE VIA EEN OVERDRACHTSMEDIUM.

摘要

An apparatus is described for reproducing digital information from an optically readable disc. In order to measure the phase difference between a channel clock and the intersections of the data signal being read with a decision level, samples on both sides of said intersections are interpolated and the amplitudes of the samples are compared with the decision level. The amplitude difference is a measure of the phase difference.