ADAPTIVE WRITING METHOD FOR HIGH-DENSITY OPTICAL RECORDING APPARATUS AND CIRCUIT THEREOF

摘要

AN ADAPTIVE WRITING METHOD OF A HIGH-DENSITY OPTICAL RECORDING APPARATUS AND A CIRCUIT THEREOF. THE CIRCUIT INCLUDES A DISCRIMINATOR (102) FOR DISCRIMINATING A MAGNITUDE OF A PRESENT MARK OF INPUT NRZI DATA AND MAGNITUDES OF LEADING AND/OR TRAILING SPACES OF THE INPUT NRZI DATA, A GENERATOR (108) FOR CONTROLLING THE WAVEFORM OF A WRITE PULSE IN ACCORDANCE WITH THE MAGNITUDE OF THE PRESENT MARK OF THE INPUT NRZI DATA AND THE MAGNITUDES OF THE LEADING AND/OR TRAILING SPACES OF THE INPUT NRZI DATA TO GENERATE AN ADAPTIVE WRITE PULSE, AND A DRIVER (110) FOR DRIVING A LIGHT SOURCE BY CONVERTING THE ADAPTIVE WRITE PULSE INTO A CURRENT SIGNAL IN ACCORDANCE WITH DRIVING POWER LEVELS FOR RESPECTIVE CHANNELS OF THE ADAPTIVE WRITE PULSE. THE WIDTHS OF THE FIRST AND/OR LAST PULSES OF THE WRITE PULSE WAVEFORM ARE VARIED IN ACCORDANCE WITH THE MAGNITUDE OF THE PRESENT MARK OF INPUT NRZI DATA AND THE MAGNITUDE OF THE LEADING AND/OR TRAILING SPACES, THEREBY MINIMIZING JITTER TO ENHANCE SYSTEM RELIABILITY AND PERFORMANCE.(FIG 3)