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| Number | Title | Issue Date |
| 8004945 | Recording medium access device An information reproduction device according to the present invention is a device for accessing a recording medium having first address information and second address information recorded thereon. The first address information is represented by a shape formed on the... | 08/23/2011 |
| 8000199 | Optical disk apparatus An optical disk apparatus to record data on an optical disk on which a wobble is formed, the optical disk apparatus including; a detection unit including a BPF which a signal obtained from a reflected light from an optical disk passes, the detection unit to detect a... | 08/16/2011 |
| 7978579 | HD DVD wobble detection circuit In a circuit, a wobble detector detects a wobble signal from an optical recording medium and a synchronization signal based on the wobble signal and provides a wobble clock signal. A wobble signal phase imperfection detector responds to the wobble signal and detects... | 07/12/2011 |
| 7969847 | Disc apparatus A disc apparatus comprising: a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium; a defocus-value setting unit configured to set a defocus value for focusing an objective lens in the medium based on the jitter... | 06/28/2011 |
| 7961578 | Method and apparatus for generating synchronous clock for write operation in a disk drive According to one embodiment, a disk drive configured to write data to a disk being rotated by a spindle motor has a synchronous clock generator that generates a synchronous clock to use during the write operation. The synchronous clock generator inputs the rotationa... | 06/14/2011 |
| 7957242 | Servo parameter detection method and optical pickup device using the same An optical pickup inspection device 3 sends to an actuator drive circuit 16 a command for changing defocus offset amount to set defocus offset amounts, and calculates jitter values for each of the defocus offset amounts based on a reproduction signal f... | 06/07/2011 |
| 7944790 | Optical disc apparatus and data recording method thereof In order to ensure recording quality while suppressing the adverse effects due to performance variations among apparatuses and disc radial positions on an optical disc, an optical disc apparatus according to the present invention performs, at the time of data record... | 05/17/2011 |
| 7940620 | Modified jitter criterion for optical recording media The present invention relates to a method for checking the quality of a recording on a disk intended to be read with a first wavelength and intended to be recorded with a second wavelength, directly with the second wavelength used by the recording system. According ... | 05/10/2011 |
| 7916600 | Optical writing device, optical reading device, recording-medium writing method, including wobble signal evaluation features When performing writing and/or reading of information to/from an optical disk provided with a wobble including time axis information, an occurrence of a reading error of the time axis information from the wobble is suppressed so that disabled reading of information ... | 03/29/2011 |
| 7911909 | Jitter counter and optical disc apparatus using same A jitter counter according to the present invention is connected to a PLL circuit for generating a clock signal, which is necessary for signal processing, from a binary signal, and counts jitters of the binary signal. The jitter counter comprises: a determination si... | 03/22/2011 |
| 7869325 | Optical disc apparatus and method of focus balance adjustment While reproducing information on an optical disc, an optical disc apparatus varies a focus balance value in both positive and negative directions from a currently set value thereof by ±a which will not affect reproduction operation, measures jitter levels c and d o... | 01/11/2011 |
| 7869326 | Optical disc drive, optical storage medium, optical storage medium inspection apparatus, and optical storage medium inspection method An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit ... | 01/11/2011 |
| 7835243 | Protective system and method for data write of an optical drive A protective system and method for data write of an optical disk drive, which produces a pseudo synchronization signal for the optical disk drive to perform a write operation on an optical disk. First, a write target sector is determined and a current sector of the ... | 11/16/2010 |
| 7773476 | Apparatus for reproducing encoded data An aspect of the present invention provides an apparatus for reproducing encoded data that includes a data analyzer configured to analyze an encode method of the encoded data to reproduce, a controller configured to receive a seek command and a target time to seek, ... | 08/10/2010 |
| 7768891 | Optical disc recording and reproduction apparatus having automatic gate signal generation modes An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from... | 08/03/2010 |
| 7742373 | Optical disk drive for scanning an optical disk carrying a groove with a wobble An optical disk drive for scanning an optical disk having a wobbled groove and a land portion separating adjacent parts of the groove. The optical disk drive has a beam generator for generating a read beam and directing the read beam to the optical disk, a sensor fo... | 06/22/2010 |
| 7680009 | Optical disc reproducing apparatus performing equalizer adjustment An optical disc reproducing apparatus has a function of setting a cutoff frequency and a boost amount of a read out signal from an optical disc and performing equalizer adjustment, and includes a system controller for searching for an optimal jitter value by simulta... | 03/16/2010 |
| 7668061 | Method and apparatus for detecting specific signal pattern in a signal read from an optical disc A method utilized for detecting a physical mark in a signal read from an optical disc, including: generating a matching signal capable of being utilized to identify the physical mark according to a reference clock and a wobble clock; generating a comparison signal b... | 02/23/2010 |
| 7663998 | Information reproduction device and read clock monitoring method An information reproduction device capable of a more appropriate frequency monitoring of a read clock, as compared to conventional devices, is realized. By providing the information reproduction device with a frequency difference detection means which detects a diff... | 02/16/2010 |
| 7599270 | Optical disc storage systems and methods utilizing frequency predictive wobble signal detection A wobble signal for an optical storage device is generated by adjusting a center frequency (ω0) of a band pass filter based on an expected frequency of the wobble signal and/or an estimated position of a pick-up apparatus and filtering an input signal co... | 10/06/2009 |
| 7583578 | Optical storage medium inspection method for determining if an optical storage medium is good or defective An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit ... | 09/01/2009 |
| 7580334 | Optical storage medium inspection apparatus for determining whether an optical storage medium is good or defective An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit ... | 08/25/2009 |
| 7529167 | Optical disk having wobble patterns representing control information On an optical disk medium according to the present invention, address information is recorded along a wobbling track groove 2. The track groove 2 is made up of a plurality of unit sections 22, 23. Each of these unit sections 22, 23 has si... | 05/05/2009 |
| 7489608 | Wobble signal detection Wobble detection for detecting data in a wobble signal modulated with a base signal includes sampling the wobble signal at a substantial maximum and a substantial minimum of a base signal within a wobble period, producing a value of the wobble signal at the substant... | 02/10/2009 |
| 7486602 | Tilt control for reading information An apparatus for scanning a track on a record carrier has a head for scanning the track and generating a read signal. The tilt between the head and the record carrier (11) is compensated via a tilt servo loop. Thereto the head is provided with tilt compensati... | 02/03/2009 |
| 7471604 | Apparatus for detecting and correcting wobble error and phase locked loop circuit using the same An apparatus for detecting and correcting an error in a wobble signal, includes a window generator which generates a window signal using a phase locked wobble signal, which is generated in synchronization with a raw wobble signal rwb obtained by binarizing the wobbl... | 12/30/2008 |
| 7460456 | Radial control method for a device for reproducing information of an optical disk, and reproduction device for carrying out said method The invention relates to a radial slaving method and to a reproduction device implementing it for optical discs. In an optical head of a conventional reproduction device using a four-quadrant detector with four photodiode is distributed on either side of a di... | 12/02/2008 |
| 7460457 | Optical disk recording/playback apparatus and optical disk evaluation method using a temporary memory A counter 11 continuously reads in the EFM signal from a binarizing circuit 4, resets its count value each time the polarity of the EFM signal changes, counts counter clocks higher in frequency than the EFM signal during each EFM period of the EFM sign... | 12/02/2008 |
| 7433286 | Jitter detection apparatus In a jitter detection apparatus, a playback RF signal 3 detected from an optical disc medium 1 is subjected to waveform shaping, and thereafter, converted into a digital RF signal 6 with a sampling clock having a cycle twice as long as a cycle o... | 10/07/2008 |
| 7427934 | Method and circuit for recovering a clock The present invention relates to a method for recovering a clock from a run-length-coded data stream, said method making it possible for a phase-locked loop to lock in a rapid manner, and also to a circuit for implementing the method. An inventive method for recover... | 09/23/2008 |
| 7426165 | Method and apparatus of recording information in reduced waiting time A method, apparatus and computer-readable recording medium are disclosed, for recording information in an information recording medium. The method includes a first step of outputting, in response to an initialization request for initializing the information recordin... | 09/16/2008 |
| 7423948 | Phase error detecting circuit and synchronization clock extraction circuit In a phase error detecting circuit used in a synchronous clock extracting circuit for extracting a clock which is synchronized with reproduced data, a cross reference value generator 72 inputs, as a rising cross reference value S5, rising phase error d... | 09/09/2008 |
| 7403456 | Optical disc recording method and apparatus An optical disc recording method and apparatus is capable of overwriting a phase change optical disc at high speed. With a preceding erasing beam out of two laser beams, a modulation component in an RF signal recorded on an optical disc is erased to a state where no... | 07/22/2008 |
| 7400566 | Method of sequentially recording programs using calculated reception ending times A information recording and reproducing apparatus is capable of recording received audio data in real time in a recording medium, in a searchable state with respect to each piece of music, with simple processing. The information recording and reproducing apparatus r... | 07/15/2008 |
| 7397750 | Optical disc apparatus with rule based synchronization An optical disk apparatus for detecting synchronization signals of an optical disk. Marks and spaces are alternately arranged as synchronization signals of the optical disk. An encoding/decoding circuit of the optical disk apparatus utilizes a rule for alternately a... | 07/08/2008 |
| 7369625 | Apparatus and method for slicing RF signal and compensating for the slice level of RF signal in disk drive An apparatus and method for slicing an RF signal and compensating for the slice level of an RF signal reproduced from a disk, which minimizes a block error rate by optimizing the slice level of the RF signal according to variations in symmetry of the RF signal when ... | 05/06/2008 |
| 7362671 | Optical disc recording and/or playing apparatus and method A data recording and/or playing method for recording or playing data to or from an optical disc having a first recording area, where a frame sync signal and the data are recorded, and a second recording area, where a predetermined pattern is preformed, and having ad... | 04/22/2008 |
| 7362681 | Recording medium type determining apparatus and method for determining presence of wobble on a recording medium A push-pull signal Spp fetched with tracking open is smoothed to a smoothing signal Spp to remove signal components generated wobbling due to radial runout, and the smoothing signal is binarized to compute an autocorrelation value in the autocorrelation computing ci... | 04/22/2008 |
| 7355938 | Timing recovery method and storage apparatus for suppressing control of sampling positions A timing recovery method samples, equalizes and detects a signal reproduced from a recording medium and to output a detection signal, controls sampling positions based on a phase error between the equalized signal and the detection signal, and obtains likelihood inf... | 04/08/2008 |
| 7352674 | Apparatus and method for encoding wobble signal to be recorded on optical disc, and apparatus and method for decoding wobble signal read from optical disc Herein disclosed are an apparatus and method for encoding a wobble signal to be recorded on an optical disc, and an apparatus and method for decoding a wobble signal read from the optical disc. The encoding apparatus performs a minimum shift keying modulation operat... | 04/01/2008 |
