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| Number | Title | Issue Date |
| 8184515 | Phase error detecting device, waveform shaping device and optical disc device A waveform shaping portion receives a digital reproduced signal generated from an analog reproduced signal reproduced from an information recording medium and shapes the waveform of the digital reproduced signal. A maximum likelihood decoding portion applies maximum... | 05/22/2012 |
| 8179761 | Filter and filtering method thereof A filter, including a direct-current (DC) tracking unit, a subtracter and a control unit, is provided. The DC tracking unit extracts a DC component of a radio-frequency (RF) signal and accordingly generates a level signal. The subtracter subtracts the level signal f... | 05/15/2012 |
| RE43337 | Method for decoding disc information A pre-treating circuit for accessing the disc and a method thereof, which are especially used for treating the signal waveform that violates the encoding rule of the disc information, are provided. The present invention can modulate the signal waveform that violates... | 05/01/2012 |
| 8121008 | Evaluation apparatus, evaluation method, and program An evaluation apparatus obtains an evaluation value of a signal read from an optical recording medium includes a reading device reading a signal recorded on the optical recording medium. Edge positions are detected of the read signal acquired by the reading device. ... | 02/21/2012 |
| 8085637 | Tracking error signal detection apparatus and optical disc apparatus A DPD tracking error signal detection apparatus includes the following. Four differentiators remove DC components and differentiate four signal with varying differential phases. The signals are then sampled and quantized by four A/D converters, and output to a non-i... | 12/27/2011 |
| 8072862 | Adaptive distortion corrector A system includes a sampling module and a correction module. The sampling module is configured to sample an input signal at sampling points and to output samples. The correction module is configured to output a correction factor when the first one of the samples is ... | 12/06/2011 |
| 8036082 | Optical disk drive carry out focus pulling-in with improved operation accuracy An optical disk drive includes a servo control unit 7 for causing an optical disk A to be driven; an optical pickup 2 for reading recorded data from the recording surface of the optical disk A after carrying out focus pulling-in of an object lens; a CP... | 10/11/2011 |
| RE42535 | Optical disc drive and method of examining the optical disc drive An optical disc drive for recording and playing back a recordable-type optical disc includes a driving mechanism for rotating the optical disc, an optical pick-up for writing and reading data to and from the optical disc, signal processor for processing signals read... | 07/12/2011 |
| 7965601 | Disk recording/reproducing apparatus and disk recording method To provide an optical disk recording/reproducing apparatus capable of immediately suspending recording if a recording inadequate state occurs after start of recording, confirming the recording state by using an error-correction-code word unit and restarting recordin... | 06/21/2011 |
| 7948848 | Reproduction data recording methods A reproduction data recording method for an optical storage medium. The method comprises storing additional data to a first temporary region of a memory device; reading the first recorded data from the optical storage medium and storing the first recorded data to th... | 05/24/2011 |
| 7936655 | Read circuit of a disk drive system and method of signal processing thereof A read circuit of a disk drive system that adaptively reduces signal-dependent noise including a sequence detector, a signal-dependent adaptive engine and a signal-dependent post-processor. The sequence detector recovers a data sequence from equalized data. The sign... | 05/03/2011 |
| 7869327 | Phase error detecting device, waveform shaping device and optical disc device A waveform shaping portion receives a digital reproduced signal generated from an analog reproduced signal reproduced from an information recording medium and shapes the waveform of the digital reproduced signal. A maximum likelihood decoding portion applies maximum... | 01/11/2011 |
| 7843788 | Optical recording medium driving device and spherical aberration adjustment method An optical recording medium driving device includes an optical head, an evaluation signal generating section, a focus servo section, a spherical aberration correction section, a focus bias adjuster, and a system controller. The optical head has a focus servo mechani... | 11/30/2010 |
| 7801004 | Method of error correction for a series of marks on an optical disc A series of marks on an optical disc are sampled to yield a series of data pulses. The marks are at least substantially angularly equidistant to one another on the optical disc. A function is performed on the series of data pulses to yield an error-corrected series ... | 09/21/2010 |
| 7782729 | Digital data recording method and data recording/reproducing apparatus The object of the present invention is to curtail the time required from the receipt of a demand for certification processing of a rewritable optical disk from an apparatus of the higher order to the receipt of a demand for recording processing. In order to achieve ... | 08/24/2010 |
| 7668062 | Disk recording medium, disk production method, disk drive apparatus 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 reproduce... | 02/23/2010 |
| RE40822 | Calibration method for slice level of zero cross signal and method of producing track-crossing signal A calibration method for a slice level of zero cross signal and a method of producing zero cross signal are disclosed. In this invention, the positive cycle and the negative cycle of the zero cross signal are sampled to obtain an error value related to the slice lev... | 07/07/2009 |
| 7545721 | Optical recording medium and recording apparatus, the medium including a linking region between unit block regions An optical recording medium having a track on which data has been previously recorded, comprising on the track a plurality of data block regions each of which includes main data of a block which is divided into a predetermined number of main data pieces, each of whi... | 06/09/2009 |
| 7539108 | Optical information reproduction apparatus and optical information reproduction method An optical information reproduction apparatus for reproducing a recording signal by irradiating a light beam onto a recording surface of an optical information recording medium having at least two information recording layers and by receiving reflected light of the ... | 05/26/2009 |
| 7477585 | Error correction device and optical disk device An optical disk device which drives HD-DVD or the like. In an HD-DVD type optical disk, address information is embedded in four wobble waves having the same phase. A wobble signal is detected by an optical pickup and demodulated by an address decoding circuit. The a... | 01/13/2009 |
| 7437053 | Digital video recorder, method of driving the video recorder and program A digital video recorder writes data on a selected one of a first storage medium and a second storage medium. The recorder includes an abnormal state detector for detecting any abnormal event that possibly occurs while the recorder is writing the data on the first s... | 10/14/2008 |
| 7428203 | Signal evaluation method, information recording/reproducing apparatus, information reproducing apparatus, and information recording medium Reproduction signals include patterns for which recognition errors are likely. With respect to such patterns, probable error patterns are prepared. Tables showing correct patterns and error patterns are prepared, and evaluation values accurately representing signal ... | 09/23/2008 |
| 7406010 | Data recording/reproducing method with robust error handling capability and data recording/reproducing apparatus thereof A data recording/reproducing method with robust error handling capability and a data recording/reproducing apparatus therefore, are provided. The data recording method includes: dividing data to be recorded on a recording medium into blocks having a predetermined si... | 07/29/2008 |
| 7403461 | Disc recording medium, disc drive apparatus, reproduction method, and disc manufacturing method 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 inform... | 07/22/2008 |
| 7400565 | Reproduction method, a program, a recording medium, and a drive apparatus A method for reproducing contents of an information recording medium, having at least one data zone, is disclosed, wherein a determination is made as to whether the entirety of a requested reproduction zone included in the data zone of the information recording medi... | 07/15/2008 |
| 7386222 | Audio/video information recording/reproducing device and method therefor An audio/video information recording/reproducing device capable of easily implementing a post-recording function on an optical disk by using even a low-cost disk drive having a comparatively low-speed seek time. When recording a video file, it is recorded on an opti... | 06/10/2008 |
| 7366963 | Data recording/reproduction device, data recording/reproduction method, and digital camera The present invention is directed to a data recording method of notifying degree of deterioration of recording medium thus to perform stable recording operation. Even in the case where uncorrectable address read error does not exist, deterioration information is dis... | 04/29/2008 |
| 7355957 | Optical disc medium having a system information recording area of low recording density In order to stably carry out reproduction of information in an optical disc medium (10) using a PRML (partial-response maximum-likelihood) method for reproducing the signal, the optical disc medium (10) has not only a data recording area (14) wh... | 04/08/2008 |
| 7355947 | Optical disk device and optical disk In an optical disk of HD-DVD, data is recorded in both grooves and lands. A groove track includes its own data region called a groove (G) track address system formed therein and a land track includes its own data region called a land (L) track address system formed ... | 04/08/2008 |
| 7355936 | Disc recording medium, disc drive apparatus, and reproduction method First data representing user data and third data use the same error correction codes. The first data has a first error correction block structure and the third data has a second error correction block structure. That is to say, the first data and the third data have... | 04/08/2008 |
| 7350118 | Method and apparatus for recording information in concatenated manner A method of recording data as presence/absence of marks on an information recording medium includes a step of obtaining data pieces, each of which has size of one block and is made by adding error-correction-purpose data to information data, a step of attaching to e... | 03/25/2008 |
| 7349296 | Write control in response to tracking error A method for controlling writing on a data carrier device, at least including: writing data on the data carrier device with a data writer device; obtaining a tracking error signal corresponding to a position of the data writer device with respect to a track on the d... | 03/25/2008 |
| 7333408 | Demodulator, disk drive device, and phase adjustment method In a demodulation process of a first modulated signal and a second modulated signal, phase adjustment is automatically performed by generating, in response to demodulation results, an optimum phase value of a second internal reference wave for demodulating the secon... | 02/19/2008 |
| 7330413 | Smart burn method for optical drive The present invention is smart burn method for optical drives. When the laser pick-up head bears great oscillations along the vertical and horizontal directions, the laser light cannot focus on the track accurately that causes the failure of writing. The present inv... | 02/12/2008 |
| 7319652 | Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Mo... | 01/15/2008 |
| 7315507 | Information recording medium, and recording method and reproducing method thereof An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit arra... | 01/01/2008 |
| 7313081 | Information recording medium, and recording method and reproducing method thereof An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit arra... | 12/25/2007 |
| 7313069 | Optical recording medium and recording apparatus, the medium including a linking region between unit block regions An optical recording medium having a track on which data has been previously recorded, comprising on the track a plurality of data block regions each of which includes main data of a block which is divided into a predetermined number of main data pieces, each of whi... | 12/25/2007 |
| 7310300 | Information recording medium, and recording method and reproducing method thereof An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit arra... | 12/18/2007 |
| 7310299 | Information recording medium, and recording method and reproducing method thereof An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit arra... | 12/18/2007 |
