Individual adjustment of pit and land transition locations in an optical disc mastering process

An apparatus for writing data to an optical disc, comprising:

• an optimization circuit which generates an optimized modulation signal for modulating the writing of the data to the optical disc, the optimized modulation signal comprising a series of data symbols, each data symbol having a leading edge and a trailing edge which define a length corresponding to one of a set of associated nominal symbol lengths, wherein the optimization circuit optimizes the length of each data symbol by independently adjusting relative timing of each of the leading and trailing edges of each data symbol to optimize readback performance of the optical disc.

In an optical disc mastering system wherein a modulation signal is generated to modulate a writing beam of a laser beam recorder in order to generate a master disc having pits and lands indicative of primary data stored by the master disc, the improvement comprising:

• an optimization circuit which optimizes locations of pit and land transitions on the master disc to enhance readback characteristics of replicated optical discs subsequently formed from the master disc, the optimization circuit generating an optimized modulation signal as a series of data symbols corresponding to the pits and lands, wherein the optimization circuit individually adjusts leading and trailing edges of the data symbols.

In an optical disc mastering process in which a master disc is generated, an apparatus for minimizing effects of electrical jitter during the generation of the master disc, comprising:

• a master driver circuit, operably connectable to a signal processing system which generates a modulation signal to modulate a writing beam, comprising:
• a latch for receiving and temporarily storing successive portions of the modulation signal;
• a master oscillator, operably coupled to the latch, which generates and supplies a master clock at a selected frequency to the latch to reclock the modulation signal at the selected frequency of the master clock.