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| Number | Title | Issue Date |
| 8027233 | Optical disk device An LPP detection unit detects an LPP from a wobble signal. A correction unit obtains a difference set by performing processing of calculating a difference in signal level between an LPP-present sync pattern portion and a non-LPP sync pattern portion having the same ... | 09/27/2011 |
| 7978571 | Recording device and method, computer program, and recording medium A recording apparatus (1) is provided with: a recording device (11) for recording a data pattern onto a recording medium (100); a first controlling device (22) for stopping the recording; a reading device (11) for reading the data ... | 07/12/2011 |
| 7911899 | Optical disc reproducing apparatus using an asymmetric compensation scheme An optical disc reproducing apparatus includes an analog-to-digital (A/D) converter which converts an analog signal obtained from an optical disc to a digital signal; an asymmetry compensator which detects and corrects an offset of the digital signal; a phase locked... | 03/22/2011 |
| 7872954 | Method and apparatus for writing data to an optical disc The invention provides for a method and apparatus for writing data to an optical disc and comprising recovering an output signal from optical reading head, scaling the said output signal responsive to secondary data derived from the disc by way of the optical readin... | 01/18/2011 |
| 7872953 | Detection of data in burst cutting areas of optical disk An apparatus generates outgoing data (OD) to be provided on an optical disk (1) in a burst cutting area (2). The burst cutting area (2) further comprises markings (3) which cause a marking frequency spectrum (MFS) when reading out the bur... | 01/18/2011 |
| 7796482 | Land Pre-Pit signal processing method and related apparatus The invention provides for a method, and related apparatus, of producing a Land Pre-Pit signal during playback of an optical disc and including the steps of obtaining an output signal from an optical detector and from which the Land Pre-Pit signal is to be derived, ... | 09/14/2010 |
| 7613086 | Disk device and control method for disk device A disk device includes: a rotating unit for rotating the optical disk; an optical pick-up for reading the information data recorded on the optical disk; a moving unit for moving the optical pick-up; a focus control unit for leading the focus of the optical pick-up; ... | 11/03/2009 |
| 7573789 | Method and apparatus for recording data at accurate location on recording medium An information recording device includes a buffer memory, a buffer management unit and a phase adjusting unit. The buffer memory temporarily stores data to be written in a recording medium. The buffer management unit starts writing the data in the recording medium i... | 08/11/2009 |
| 7539096 | Disc playback apparatus and method A disc playback apparatus is configured to reproduce information by demodulating and decoding a radio-frequency signal obtained by receiving reflected light of a beam applied to a recording surface of a removable disc when the disc is loaded in the disc playback app... | 05/26/2009 |
| 7428195 | Information reproduction apparatus and information reproduction method An information reproduction apparatus and method according to the present invention are provided so as to solve the problem that signal quality is degraded in a normal signal part when always performing a correction of a transient in reproducing information recorded... | 09/23/2008 |
| 7420905 | Information reproducing method judging a multivalued level of a present cell by referring to judged multivalued levels of a preceding cell and an ensuing cell A mark representing information of a multivalued level is recorded in each of cells arranged in a recording medium. Upon reproducing the multivalued level from a reproduction signal of the recording medium, the multivalued level of a present cell is judged by referr... | 09/02/2008 |
| 7372791 | Recording/reproducing apparatus and cross talk cancel method The present invention is directed to a recording/reproducing apparatus having a Read After Write function which simultaneously performs recording operation and reproduction operation, and is such that, in a reproducing system (120) of a tape streamer (100 | 05/13/2008 |
| 7366068 | Method for recording data to a write once disc A write once disc allowing management of a data area, a method of managing the data area of the write once disc, an apparatus recording data on the write once disc, an apparatus and method of reproducing data from a write once disc. The write once disc, includes a l... | 04/29/2008 |
| 7359302 | Information media, recording and reading apparatus In a method of recording information by varying the front- and rear-edge positions of a mark by integer multiples of a specific interval, the recording density is increased without narrowing the intervals of edge position variation and without being influenced by th... | 04/15/2008 |
| 7358471 | Optical head device An optical head device includes a light source which emits a light beam, an objective lens which condenses the light beam on the optical disk, a condensing lens which condenses reflected light from the optical disk, a liquid crystal panel disposed near a focal point... | 04/15/2008 |
| 7349304 | Information storage medium evaluation method, information storage medium evaluation apparatus, information storage medium, information reproduction apparatus, information reproduction method, and information recording method An information storage medium according to an aspect of this invention has an information storage area for storing information, and a wobbled track which is used to guide a light beam on the information storage area, and is wobbled in correspondence with a frequency... | 03/25/2008 |
| 7349321 | Information reproduction apparatus and information reproduction method Disclosed here is an apparatus and method for realizing write/read of mass information by reducing cross-talk components that are apt to increase in narrow tracks when various disturbances and variations are recognized. In order to achieve the above object, the appa... | 03/25/2008 |
| 7342854 | Apparatus for generating tracking error signals An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after co... | 03/11/2008 |
| 7336702 | Jitter detecting apparatus and phase locked loop using the detected jitter A jitter detecting circuit and a phase locked loop using the detected jitter are provided. A jitter detecting circuit detecting a jitter value of a signal which is converted into a digital signal from an analog signal input, wherein the jitter value detecting circui... | 02/26/2008 |
| 7333568 | Data slicer capable of calibrating current mismatch A data slicer includes a comparator coupled with an input signal and a reference signal for generating a sliced signal, a waveform generator for generating a calibration signal, a pulse extension device coupled to the comparator and the waveform generator for modify... | 02/19/2008 |
| 7330408 | Equalizer for high density optical disc reproducing apparatus and equalizing method therefor An equalizer for a high density optical disc reproducing apparatus and an equalizing method therefore are provided. The equalizer includes: a non-linear transformer, which transforms an input signal according to predetermined threshold levels; a cosine transform fil... | 02/12/2008 |
| 7327661 | Optical pickup and optical information recording apparatus using the same An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an... | 02/05/2008 |
| 7327658 | Wobble signal processing apparatus The present invention is made to improve the conventional analog processing that is easily affected by variations in semiconductor processing. This invention provides a wobble signal processing apparatus that can reduce the circuit scale and the power consumption as... | 02/05/2008 |
| 7324249 | Recording and reproducing apparatus having fixed distortion correcting function A recording and reproducing apparatus includes a reproduction signal detection unit reproducing a two-dimensional pattern previously recorded on a holographic recording medium or user data recorded on the holographic recording medium, a reference pattern storage uni... | 01/29/2008 |
| 7321620 | Equalizer and reproduction signal processing device The present invention provides an equalizer capable of accurately compensating for non-linearity of an input signal due to the asymmetry phenomenon, etc., during the disk production process. Two tap coefficients are provided in a coefficient unit. A comparator compa... | 01/22/2008 |
| 7310296 | Method for decoding address in pre-groove data of an optical disc drive A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier frequency signal having the same phase with the wobble signal, multiplying t... | 12/18/2007 |
| 7304923 | Disk drive and detection method using pre-pit detection and push-pull signal generation A push pull signal is detected from a disk-shaped storage medium on which wobbling grooves are formed as recording tracks and address information is recorded by forming pre-pits on lands between adjacent grooves. The detected push-pull signal is compared with a refe... | 12/04/2007 |
| 7289413 | Data slicer and data slicing method for optical disc system In a data slicer and data slicing method for an optical disc system, the data slicer for converting an analog input signal into a digital signal includes a comparator, a duty detector, and a low pass filter. The comparator compares the analog input signal with a fee... | 10/30/2007 |
| 7274635 | Method and apparatus for recording address information on disc medium In step S1, 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 car... | 09/25/2007 |
| 7272092 | Adaptive level-cutting method of CD-ROM drive's radio frequency ripple signal An adaptive level-cutting method of a radio frequency ripple signal for a CD-ROM drive is proposed. A digital signal processor is added to accomplish adaptive cutting of the central level of the radio frequency ripple signal for generating an accurate radio frequenc... | 09/18/2007 |
| 7269113 | Power correction for device for scanning a record carrier A device for recording and/or reading a record carrier has an optical head with a laser for generating a beam via a scanning spot on a track of the carrier. A detector detects a read signal and a sensor detects a sense signal from the beam. A control unit controls t... | 09/11/2007 |
| 7266074 | Optical disc apparatus and method of reproducing a wobble signal An optical disc apparatus and a wobble signal detection method in which a light beam projected onto an optical disc and reflected by the optical disc is divided into at least four light regions in the direction corresponding to the radial direction of the optical di... | 09/04/2007 |
| 7257058 | Offset adjusting circuit for optical disc and offset adjusting method An offset adjusting circuit for an optical disc comprises an offset-adjustment differential operational amplifier having an input terminal to which an output signal of an optical pickup is input and the other input terminal to which a control voltage is applied, an ... | 08/14/2007 |
| 7254100 | Optical disk reproducing device selectively using a channel bit frequency or a frequency that is half of the channel bit frequency A data demodulation process rate is varied according to a reproduction state, thereby reducing power consumption while maintaining a reading performance in a favorable state. A channel rate process data demodulation device performs a data demodulation process by emp... | 08/07/2007 |
| 7248550 | Writing method and disk recording apparatus Disclosed are a writing method and a disk recording apparatus for maintaining reproduction reliability relative to a rewritable disk recording medium of a zero link type. In one embodiment, a disk recording apparatus for a rewritable optical disk comprises a first t... | 07/24/2007 |
| 7248545 | Optical pickup device According to the present invention, an optical pickup device forms one main spot, a first subspot, and a second subspot by irradiation of light on an optical disk having a groove part and a land part. The optical pickup device includes operation circuits which indic... | 07/24/2007 |
| 7239592 | Method for indicating a sector on a data medium and data medium suited to this method For indicating on a data medium (9) a sector referenced by a binary word (16) formed of a number M of first bytes each comprising a number L of bits, the method includes steps of etching onto the data medium locally at this sector a succession of M sec... | 07/03/2007 |
| 7233129 | Generator with utility fault ride-through capability A wind powered turbine with low voltage ride-through capability. An inverter is connected to the output of a turbine generator. The generator output is conditioned by the inverter resulting in an output voltage and current at a frequency and phase angle appropriate ... | 06/19/2007 |
| 7218580 | Skew detection method, optical pickup, and optical disc device There is employed a configuration to detect, by making use of an optical pick-up (104) when tracking servo is performed along wobble grooves of an optical disc (102), phase errors between main wobble signal outputted as the result of the fact that refl... | 05/15/2007 |
| 7218583 | Method for land pre-pit recovery The present invention relates to a method for recovering land pre-pits from a signal obtained from an optical recording medium. According to the invention, the method comprises the steps of: providing a phase locked loop for the la... | 05/15/2007 |
