Sony Corporation

Koninklijke Philips Corporation N.v.

Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Hitachi Consumer Electronics Co., Ltd.

Samsung Electronics Co., Ltd.

Tdk Corporation

Koninklijke Philips Electronics N.v.

Koninklijke Phillips Electronics N.v.

Shoei Kobayashi

Tamotsu Yamagami

Toru Takeda

Cornelis Marinus Schep

Aalbert Stek

Shinichiro Iimura

Mitsutoshi Terada

Tomotaka Kuraoka

Yoichiro Sako

Makoto Usui

Susumu Senshu

Nobuyoshi Kobayashi

Yasumori Hino

Mitsurou Moriya

Hideshi Ishihara

Jakob Gerrit Nijboer

Hiroshi Ogawa

Shigeru Furumiya

Harumitsu Miyashita

Junya Shiraishi

Jacobus Petrus Josephus Heemskerk

Hiromichi Ishibashi

Shozo Masuda

Tadaaki Nomoto

Sung-hee Hwang

Harukazu Miyamoto

Motoshi Ito

Hiroyasu Inoue

Shinichi Tanaka

Koichiro Nishimura

Jun Nakano

Gijsbert Joseph Van Den Enden

In-oh Hwang

Johannus Leopoldus Bakx

Johannes H M Spruit

Shuji Uehara

Yoshihiro Akimoto

Yoshiyuki Kajiwara

Masayuki Arai

Yoshiyuki Akiyama

Seiji Kobayashi

Hiroyuki Minemura

Takashi Ishida

Shin-ichi Kadowaki

Takahiro Kurokawa

Tatsuya Narahara

Yuji Takagi

Toshio Watanabe

Masanobu Yamamoto

Hiroshi Ohki

Masaki Saito

Constant Paul Marie Jozef Baggen

Hideo Owa

Bart Van Rompaey

Takuya Wada

Ryuya Tachino

Norichika Mine

Paulus Gijsbertus Petrus Weijenbergh

Tetsu Kimura

Koichiro Ogihara

Hermanus Johannes Borg

Susumu Sensyu

Hidenori Mori

Shinji Katsuramoto

Koen Vanhoof

Shinichiro Ilmura

Shin-Ichi Kadowaki

The present invention provides an information recording configuration that achieves both difficulty in reading and highly accurate reading. Highly confidential additional information such as encryption key is recorded in a groove signal. During recording of the additional information, a groove signal is recorded that has an amplitude offset setting commensurate with the bit value. During reading of the additional information, a signal Rwith no offset is estimated from a signal Rread from the groove signal for a predetermined period, after which a difference signal C=R&#x2212;Ris calculated and integrated for each of the predetermined periods so as to determine the direction of the amplitude offset for each period. This process achieves recording and reproduction of additional information that offers enhanced difficulty in reading and highly accurate reading at the same time.

Information recorder, information reproducer, recording media manufacturing system, and information recording media, method and program

The present invention is to realize a proper inner zone layout in a quadruple-layer disk. A test area is provided in the inner zone (inner circumference side area) in each of recording layers. If two test areas closer to the outer circumference, of four test areas, are defined as a first pair and two test areas closer to the inner circumference are defined as a second pair, the test areas of the first pair and the test areas of the second pair are so disposed as to be prevented from overlapping with each other in the layer direction. Two test areas of the first pair have the same consumption direction of the test area, and are so disposed that the areas to be used next hardly overlap with each other in the layer direction. Two test areas of the second pair have the same consumption direction of the test area opposite to the consumption direction of the test area in the first pair, and are so disposed that the areas to be used next hardly overlap with each other in the layer direction.

Recordable optical disc, recording device, and recording method

Address information that has been error correction encoded is recorded on a second version of a recording medium after being transformed such that such that the address decoding cannot be performed by a playback device that is not compatible with the second version of the recording medium. The address decoding for the second version of the recording medium cannot be performed by the incompatible playback device (for example, a playback device that was manufactured to be compatible only with a first version of the recording medium). In other words, in the playback device that is not compatible with the second version of the recording medium, a state is created in which address errors cannot be corrected, so access is impossible (recording and playback are impossible).

Manufacturing method for optical disc, optical disc, playback method for optical disc, playback apparatus for optical disc, recording apparatus for optical disc

An optical information recording medium operated by CAV or zone CAV, wherein a groove that wobbles is formed in advance, and information is recorded in the groove and a land adjacent to the groove, an address is recorded by a wobble signal of the groove, the groove is alternately provided with a first section recording an address N by the wobble signal, and a second section recording an address (N&#x2212;1) or (N+1) by the wobble signal, in two groove tracks sandwiching a land track, the first section of one of the groove tracks matches the second section of the other of the groove tracks, and an address of the groove is read from the first section, and an address of the land is read from the first and the second sections located on both sides of the land track, and recording a same address.

Optical information recording medium and optical information recording medium playback apparatus

An information recording processing constitution realizing both readout difficulty and high-precision readout is provided. Superimposition recording of highly secret additional information such as a cryptographic key in a groove signal recorded on a disk, which superimposition recording realizes both readout difficulty and high-precision readout, can be performed. The groove signal to which a phase error corresponding to a bit value is set is recorded at a time of recording of the additional information, and at a time of readout of the additional information, the phase error of the groove signal in a predetermined section is subjected to an integrating process and the direction of the phase error of the groove signal within each section is determined. The recording and reproduction of the additional information for increasing readout difficulty and realizing high-precision readout is realized by such processes.

Recording medium manufacturing device and method

In step S, the address generator generates address information composed of a sync signal which is recorded on an optical disc, address data and an error correction code for the address data, pre-encodes and supplies it to a modulator. At the same time, a carrier signal generator generates a carrier signal which is to carry the address information, and supplies it to the modulator. In step S, the modulator makes MSK modulation of the carrier signal supplied from the carrier signal generator on the basis of the pre-encoded address information supplied from the address generator, and supplies a resultant MSK modulation signal to a wobbling unit. In step S, the wobbling unit forms, on the optical disc, a spiral groove wobbled adaptively to the MSK modulation signal supplied from the modulator. In this optical disc, a given address can be accessed quickly and accurately.

Method of, and apparatus for, recording address information to disc medium

A disk recording medium which can implement a recording method having a high degree of reliability for additional information is disclosed. The disk recording medium has a recording and reproduction region into and from which first data can be recorded and reproduced in accordance with a rewritable or write-once-read-many recording method and from which second data recorded in the form of wobbling of a groove can be reproduced. The second data includes address information and additional information. The additional information of the second data is coded in accordance with a first error correction method, and the coded additional information and the address information are recorded in a state coded in accordance with a second error correction method.

Disk recording medium, disk production method, disk drive apparatus

A reproduction signal evaluation method evaluates the quality of a reproduction signal reproduced from an information recording medium based on a binary signal generated from the reproduction signal using a PRML signal processing system. A pattern extraction step extracts, from the binary signal, a specific state transition pattern which has the possibility of causing a bit error; a step computes a differential metric based on the binary signal; an extraction step extracts the differential metric which is not greater than a predetermined signal processing threshold; a step determines a mean value of the differential metrics which are not greater than the signal processing threshold and extracted in the extraction step; a standard deviation computing step determines a standard deviation which corresponds to an error rate predicted from the mean value; and an evaluation step evaluates a quality of the reproduction signal using the standard deviation.

Reproduction signal evaluation method, reproduction signal evaluation unit, and optical disk device adopting the same

An optical recording medium provided with one or a plurality of recording layers includes an adjustment data recording area for recording therein adjustment data used for adjusting focus or spherical aberration of laser light used for recording/reproduction, the adjustment data recording area being disposed at a predetermined position on each of the one or plurality of recording layers, and a determination information recording area for recording therein determination information indicating whether or not the adjustment data has been recorded in the adjustment data recording area in each of the one or plurality of recording layers.

Optical recording medium including multiple layers and a pre-write area

A recording and reproducing area and a reproduction-only area are formed by wobbling a groove formed in a spiral fashion to form a track to be tracked on a disk. The recording and reproducing area has address information recorded by wobbling of the groove and information recorded and reproduced by phase change marks on the track formed by the groove where the address information is recorded. The reproduction-only area has prerecorded information recorded by wobbling of the groove.

Disc recording medium, disk drive apparatus, reproduction method, and disk manufacturing method

The present invention is to realize a proper inner zone layout in an optical disk having at least three layers. A test area is provided in the inner zone (inner circumference side area) in each of recording layers. The test areas of each layer are so disposed as to be prevented from overlapping with each other in the layer direction. Furthermore, the number of management information recording/reproduction areas overlapping with the test area in the layer direction at a position closer to the laser-incident surface than this test area is set equal to or smaller than one in each test area of each recording layer. The management information recording/reproduction areas are each so disposed as to be prevented from overlapping with the test areas in the respective recording layers in the layer direction on the disk substrate side of the test areas.

Recordable optical disk, recording device, recording method, and reproduction device

Growing community of inventors

Kanagawa, Japan

Shoei Kobayashi