OPTICAL DISK PLAYERS HAVING READBACK CIRCUITS WITH NOISE REJECTION AND READ SIGNAL RETIMING

TU9-90-023 OPTICAL DISK PLAYERS HAVING READBACK CIRCUITS WITH NOISE REJECTION AND READ SIGNAL RETIMING In an optical disk player, such as for a magnetooptic player, wherein the data recorded on the optical medium are at recording at such high densities then intersymbol interference causes the peaks of the readback signals to become closer together resulting in phase errors. A transition selecting means is operative to select a transition indicated by the readback signal or a substitute transition indicated by a timed delay means generates a signal based upon the immediately preceding transition received from optical medium. Various embodiments of the invention are illustrated.