Abstract: In an optical disk apparatus, bit sequences of information regarding copyright are respectively scrambled using different binary sequences, thereby generating plural lines of signals. The plural lines of signals are further scrambled to generate a single line of drive signal, with which laser beam is modulated.

Abstract: Disclosed is an optical disk apparatus for recording copyright data onto an optical disk on which desired data is recorded by using pits or marks, comprising recording means for recording said copyright data onto said optical disk wherein said copyright data is recorded onto said optical disk in such a manner that a result of reception of returned light obtained by irradiating said optical disk with a laser beam represents substantially the same signal waveform as that of a multi-value modulation signal of said copyright data. With the configuration of the optical disk apparatus, it is possible to protect the interests of copyrighters much more effectively than a conventional method.

Abstract: A device for removing a crosstalk component mingled from an adjacent track to a target track from a reproduction signal of the target track is provided for automatically adjusting a coefficient on which the amplitude of the reproduction signal of the adjacent track is adjusted for generating a crosstalk component signal. A crosstalk component signal generating unit 20 operates to generate a crosstalk component signal 20E or 20F by adjusting an amplitude of a signal 21a or 22a having a suppressed high frequency component of each reproduction signal ERF or FRF of the adjacent track with respect to the coefficient KE or KF. A subtracting unit 30 operates to output subtract the crosstalk component signal 20E or 20F from a main reproduction signal MRF for outputing a crosstalk-removed signal 8a.

Abstract: A method and an apparatus arranged to record data at a higher density. Learning data generated by a learning data generating circuit is recorded on a disc and is actually reproduced by a player to measure inter-code interference in the learning data by an inter-code interference measuring section. In a pre-emphasis correction value calculating section, a pre-emphasis correction value corresponding to the measured inter-code interference is calculated. The result of this calculation is recorded as a table in a ROM of a recording edge position calculating circuit. The recording edge position calculating circuit processes recording data output from an information source in accordance with the table recorded in this ROM.

Abstract: The invention provides a recording medium as well as a recording apparatus and a reproducing apparatus for the recording medium by which data can be reproduced even when a skew occurs. Reference signal areas and data areas are provided periodically on an optical disk. Each of the reference signal areas has recorded thereon a synchronizing signal, a gain reference signal and a bias reference signal as well as a phase reference signal for correction of a displacement of sampling at the trailing edge of a pit and a phase reference signal for detection of a displacement of sampling at the trailing edge of a pit.

Abstract: The invention provides a recording medium as well as a recording apparatus and a reproducing apparatus for the recording medium by which data can be reproduced even when a skew occurs. Reference signal areas and data areas are provided periodically on an optical disk. Each of the reference signal areas has recorded thereon a synchronizing signal, a gain reference signal and a bias reference signal as well as a phase reference signal for correction of a displacement of sampling at the trailing edge of a pit and a phase reference signal for detection of a displacement of sampling at the trailing edge of a pit.