Sony Corporation

Sony Disc & Digital Solutions Inc.

Sony Disc & Digital Sloutions Inc.

Yoshinobu Usui

Akiya Saito

Yoichiro Sako

Tatsuya Inokuchi

Toru Aida

Yoriaki Kanada

Shunsuke Furukawa

Takashi Kihara

Toshihiko Senno

Tatsushi Sano

Yoshiro Miyoshi

Yoshitake Yanagisawa

Makoto Tsukahara

Tomihiro Nakagawa

Jun Sato

Tomoji Mizutani

Akihiko Shoda

An optical disc medium and corresponding optical recording method and optical recording apparatus. The optical disc medium comprises a substrate on which a shape according to modulated information data has been formed, and a coating film formed on the substrate. Known data is recorded in a predetermined location of the information data, with the known data being rewritten as postscript information by recording a postscript portion to the coating film to alter a portion of the known data, wherein the postscript information comprises readable non-error data.

Optical disc medium and data recording method and apparatus

A molding and film forming apparatusmolds a disc substrate from a stamperformed from an optical disc disc-masterand forms a coating film, for example, a reflective film onto the disc substrate, thereby forming a recorded optical disc. A postscript apparatuswrites postscript information once onto an optical discformed by the molding and film forming apparatus. As postscript information, a laser beam is irradiated to a predetermined interval of the optical disc, a portion which is detected as a pit is formed, and an optical discon which postscript informationhas been recorded is formed. Identification information which enables each optical discto be identified can be postscribed. The postscript information is recorded in a conventional format and the postscript information can be reproduced by an existing reproducing apparatus.

Optical disk medium, and data recording method and device

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

The present invention is relative with a method for recording further data on a recording medium on which there re pre-recorded data obtained on modulating M-bit data to N-bit data, where M&#x3c;N. The further recorded data are recorded by changing a certain bit or bits of the N-bit data, with the remaining portion of the bits of the N-bit data being fixed.

Data recording method recorder and data reproducing 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

A method is provided for recording medium having a substrate on which first data and second data are recorded as a protrusion/depression pattern and a reflective layer that is provided on a surface having the protrusion/depression pattern. Laser light is radiated to the reflective layer to change the protrusion/depression pattern of the second data, and third data used for identifying the recording medium is additionally recorded at a predetermined position on the recording medium.

Data recording apparatus and associated method of imparting data to a recording medium by irradiating a reflectivity layer of the medium

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

The present invention relates to a signal shaping circuit which is capable of shaping a returning light signal of a modulated signal whose signal level and signal length are arbitrarily varied such that it can be demodulated. The shaped signal pattern generation circuithas, in advance, variation pattern information with regard to a predetermined variation pattern to be applied on a returning light signal recorded therein. The counterinputs a returning light signal, counts a signal length thereof and sends a count value to the shaped signal pattern generation circuit. An A/D conversiondetects a signal level of the returning light signal and sends the detected signal level to the shaped signal pattern generation circuitin a similar way. The shaped signal pattern generation circuitrefers to the variation pattern information and calculates an optimum signal pattern corresponding to a signal length and a signal level of the inputted, returning light signal. The calculated shaped signal pattern is outputted to a shaped signal generation circuit. Based on the signal pattern, the shaped signal generation circuitconverts the returning light signal and generates an optimum shaped signal.

Signal shaping circuit

This invention provides a matrix switcher apparatus adapted to arbitrarily distribute signals in a plurality of input channels to a plurality of output channels. The matrix switcher apparatus includes a cross point matrix adapted for connecting one matrix switcher unit to any other matrix switcher unit or units to carry out expansion of input/output, and input and output terminals expandable up to a predetermined maximum number of channels. Further, this invention provides a matrix switcher apparatus comprising a first cross point matrix including a first group of input terminals to receive signals in a plurality of channels, and a first group of output terminals for at least some of the plurality of channels and a second group of output terminals for expansion to any other unit or units; and a second cross point matrix including a second group of input terminals coupled with the first group of output terminals and a third group of input terminals for receiving signals from one or more additional matrix switcher apparatus for expansion, and a third group of output terminals fewer in number than the plurality of channels, thereby making it possible to construct a matrix switching system on a compact scale or in any of a variety of scales, and to reduce its cost.

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Kanagawa, Japan

Yoshinobu Usui