Sony Corporation

Sony Disc & Digital Solutions Inc.

Sony Dadc Corporation

Toshihiko Senno

Toru Aida

Akiya Saito

Yoshinobu Usui

Yoichiro Sako

Tatsuya Inokuchi

Shunsuke Furukawa

Yoriaki Kanada

Takashi Kihara

Tatsushi Sano

Yoshiro Miyoshi

[Object] To enable additional supplementary information such as PID to be utilized in a generally-used DVD player. [Solving Means] Additional supplementary information recorded with additional recording mark rows of the additional recording mark rows and pit rows is set to be previously recorded in a format of command information for instructing a normal DVD player to read. Similar to a so-called navigation command in a DVD system, in recording information that can be handled by the reproduction device, the additional supplementary information can be used, to thereby utilize the additional supplementary information in the current reproduction device.

Read-only optical disc and method of manufacturing a read-only optical disc

A method of recording data includes: a first recording step of recording data in a condition that, within a certain error correction block in a data format in which error correction blocks with n rows and m columns including at least main data, error detection code, and error correction parity are formed, an allocated location of additional supplementary information is set in a location in the same column as an allocated location of the error detection code, and an additional recording area is formed for recording additional information containing the additional supplementary information and the error detection code and the error correction parity necessary to be recorded according to the recording of the additional supplementary information; and a second recording step of recording the additional information in the additional recording area after the data recording at the first step is executed.

Method of recording data, method of manufacturing read-only optical disc, and read-only optical disc

Data is arranged to one block obtained after a CIRC process so that a predetermined data pattern is recorded into a predetermined portion on a disc. By tracing back an encoding step of a Cross-Interleave Reed-Solomon Code (CIRC), a layout of recording data of one block before the CIRC process for allowing the predetermined data pattern to be recorded into the predetermined portion is obtained. An error correcting process of a CD-ROM mode 1 is executed. If a position of a parity coincides with data for forming the predetermined data pattern, a value of user data of an encoding sequence to form the parity is changed. After error correction encoding of a CD-ROM is executed, encoding of the CIRC is executed to the recording data of one block.

Data recording method and device

A recording method for converting m-bit data into n-bit (where n&#x3e;m) bit data whose run length is restricted and recoding the converted data on a recording medium, the recording method comprising the steps of when at least preceded data is data containing a special data pattern, lightening the restriction of the run length; and recording data so that the cumulative value of DC components per unit time increase when the data is reproduced in the state that the run length is restricted.

Data recording medium, and data recording method and device

A recording method for converting m-bit data into n-bit (where n&#x3e;m) data whose run length is restricted and recording the converted data on a recording medium, the recording method comprising the step of selecting first n-bit data according to an immediately preceded n-bit data, first n-bit data immediately followed thereby, and second n-bit data immediately followed thereby so that the cumulative value of DC components per unit time becomes small.

Data recording medium, data recording method and device, and encode method and device

A recording method includes the steps of generating recording data in such a manner that, when m-bit data is converted into a data symbol of n bits (m&#x3c;n), and connection bits such that the summed value of DC components per unit time decreases are selected from among a plurality of connection bits and are added after the m-bit data symbol, the connection bits differing from connection bits which are added when the n-bit data symbol is a data symbol other than the special data symbol are added to generate recording data; and recording the generated recording data on a recording medium.

Data recording apparatus and associated methodology of affecting a digital sum variance

A recording method, wherein, when a certain portion of main data is recorded by being encoded by a first encoding method and the other portions of the main data is recorded by being encoded by a second encoding method, an encoding process is performed by the first encoding method so that, when data which is recorded in such a manner that the data encoded by the first encoding method is decoded by a decoding method corresponding to the first encoding method, and thereafter, is further encoded by the second encoding method, is decoded by a decoding method corresponding to the second encoding method, the sum value of DC components per unit time increases.

Digital data recording medium, recording method, recording device, reproduction method, and reproduction device

Six record areas for predetermined data that has been encoded and digitally modulated are formed in a data record area on a disc. The record areas have different offset compensation amounts. The offset compensation amounts allow all offset amounts that may take place in an error correction code encoder to be compensated. Thus, regardless of the offset amount generated by the error correction code encoder, encoded and modulated data that has been generated by the conventional EFM modulating system and recorded in one of the record areas securely causes DSV to deviate. Each of the record areas is set to a sufficient length that allows the effect of which DSV deviates to be recognized.

Data recording medium, data recording method, and device

A recording medium has a first area in which data encoded with a first error correction code is recorded and a second area in which data encoded with the first error correction code and data decodable with a second error correction code that is different from the first error correction code are mixedly recorded. Data that causes the cumulated value of a DC component per unit period of data reproduced from the second area to deviate is recorded in the second area.

Recording medium, recording method, recording device, and reproduction method and reproducer

The present invention relates to a modulated signal generator capable of carrying out signal processing at a higher speed or capable of supporting a special format and a new format with ease. A modulation processing storing unithas a modulation processing program required for producing an optical disc masterstored therein in advance. Information data recorded in an master optical discis reproduced by an information reproducing unitand is outputted to a modulation controller. The modulation controllercarries out the signal modulation processing onto the reproduced information data in accordance with the signal modulation processing program so as to generate a data stream and stores the data stream in a modulated information storing unitas necessary. The modulation controllersends a data stream generated at that time or the data stream stored in the modulated information storing unitto a modulated signal outputting unit, and the data stream is outputted to a laser beam recorderby the modulated signal outputting unitat a predetermined clock. The present invention can be applied in cases of producing optical discs such as CD, MD, DVD and the like.

Modulation signal generator for producing original disc of optical disc

Output data of a multiplexeris EFM-modulated by an EFM modulatorIn the EFM modulation, merging bits that satisfy run length limit conditions Tmin=3 and Tmax=11 are selected. Among them, merging bits that converge DSV are selected. A run length controlling portiondetects a particular data pattern that causes DSV to increase as large as a data read error takes place and controls the EFM modulatorso that the run length limit conditions of the EFM are loosened. As a result, an increase of DSV is suppressed. Data is reproduced from a data recording medium on which the data has been recorded in such a manner and the reproduced data is decoded. The decoded data is re-encoded so as to record it to another recoding medium. When the data pattern is re-encoded, DSV increases. As a result, data cannot be correctly reproduced from the other recording medium. Consequently, a copying operation can be prevented.

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Kanagawa, Japan

Toshihiko Senno