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| Number | Title | Issue Date |
| 7768884 | Dropout detection device, disk reproduction apparatus, and dropout detection method A dropout detection device, a disk reproduction apparatus, and a dropout detection method for detecting the occurrence of a dropout are provided. A low-pass filter outputs, as a signal LFENV, a low-frequency component of an envelope signal ENV generated by an envelo... | 08/03/2010 |
| 7567488 | Dropout detection circuit and optical disc apparatus The dropout detection circuit of the invention includes: a high-speed envelope detection circuit for detecting an envelope of a reflection signal of a light beam with a first time constant; a low-speed envelope detection circuit for detecting an envelope of the refl... | 07/28/2009 |
| 7496008 | Apparatus for removing offset of phase locked loop circuit and method thereof An apparatus and a method removing offset of a Phase Lock Loop (PLL) circuit in a disc drive without using a disc when data playback is performed, the apparatus including an ENDEC module and a PLL circuit. The ENDEC module outputs a binary signal if an offset remova... | 02/24/2009 |
| 7433289 | Frequency detection method for optical disc bit data reproduction apparatus The present invention relates to a frequency detection method for an optical disc bit data reproduction apparatus. The frequency detection method uses the optical disc bit data reproduction apparatus including an Analog to Digital Converter (ADC), an interpolator, a... | 10/07/2008 |
| 7372797 | Data reproduction device A data reproduction device for sampling a signal reproduced from a recording medium based on a synchronization clock signal synchronized with the reproduced signal includes: an analog-to-digital conversion part converting the reproduced signal into a first digital s... | 05/13/2008 |
| 7343544 | Optical disk playback apparatus and data playback method therefor An optical disk playback apparatus for playing back or reproducing main data and its associated sub-code which are read from an optical recording medium comprises an interleave RAM for storing the main data. The optical disk playback apparatus performs a predefined ... | 03/11/2008 |
| 7339873 | Data recording/reproducing apparatus, data recording/reproducing method, program, and recording medium A data recording/reproducing apparatus for use with a disc recording medium having a plurality of either concentric or spiral tracks formed thereon, each of the tracks being divided into a plurality of sectors is provided. The apparatus includes a seeking element fo... | 03/04/2008 |
| 7339867 | Defect-signal generating circuit and optical disk reproducing device having the same An optical disk reproducing device has a defect-signal generating circuit including a peak-holding-signal generating circuit for generating a peak-hold signal based on an RF signal read from a recording medium, an intermediate-signal generating circuit for generatin... | 03/04/2008 |
| 7327647 | Method and apparatus for generating the wobble clock signal A method for generating a wobble clock signal. When the wobble signal becomes deformed or a defect on the optical disc is found, the present invention provides a stable wobble clock signal, which is used to maintain a stable rotation speed when the optical disc is p... | 02/05/2008 |
| 7313082 | Sync frame structure, information storage medium, information recording method, information reproduction method, information reproduction apparatus To improve the sync code detection reliability while simplifying the sync code position detection process, when a first pattern as a combination of three successive sync codes is compared with a second pattern in which the allocation of sync codes is shifted by one ... | 12/25/2007 |
| 7308061 | Read channel apparatus and method for an optical storage system A read channel apparatus is disclosed for reading data recorded on an optical storage system at a predetermined baud rate. The apparatus asynchronously samples an analog read signal generating from the optical storage system and subtracts an estimated DC offset from... | 12/11/2007 |
| 7286749 | Moving image playback apparatus, moving image playback method, and computer program thereof with determining of first voice period which represents a human utterance period and second voice period other than the first voice period In a moving image playback apparatus, periods A which represent human utterance periods, and other periods B are determined on the basis of sub-information contained in moving image data. Based on the moving image data, periods A undergo high-speed moving image play... | 10/23/2007 |
| 7269214 | Waveform equalizer A waveform equalizer is designed to perform high frequency enhancement on a read signal without increasing inter symbol interference even when the shortest run length of the read signal is not greater than twice the clock period of the channel clock signal. An addit... | 09/11/2007 |
| 7257071 | Apparatus and method for detecting frame synchronization signal for reducing errors in data demodulation in optical disc system A frame synchronization signal detection apparatus includes a synchronization signal detector, a main frame synchronization signal generator, a sub frame synchronization signal generator, and an output unit. The synchronization signal detector detects and outputs a ... | 08/14/2007 |
| 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 |
| 7248549 | System for locking a clock onto the frequency of data recorded on a storage medium A circuit locks onto a frequency of data encoded on a medium, taking frequency variations in the physical travel of the medium into account. The circuit includes a disk locked clock (DLC) circuit having a synthesizer operating under digital control based on a feedba... | 07/24/2007 |
| 7245658 | Read channel apparatus for an optical storage system A read channel apparatus is disclosed for reading data recorded on an optical storage system. An exemplary sampling device samples an analog read signal generating from the optical storage system to generate a sequence of sample values. A subtractor subtracts an est... | 07/17/2007 |
| 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 |
| 7230898 | Reproducing apparatus and recording apparatus This invention relates to a reproducing apparatus compatible with a storage medium storing copyright-protected and copyright-unprotected files, the reproducing apparatus being capable of reproducing any one of the files stored on the medium, the reproducing apparatu... | 06/12/2007 |
| 7224659 | Disk reproducing device with suppressed reproduction signal error An RF signal that is a disk reproduction signal is binarized through an equalizer and a slicer, followed by data demodulation, and an error rate of the reproduction signal is detected in an error detection circuit. If the error rate in the error detection circuit is... | 05/29/2007 |
| 7212567 | Read channel apparatus and method for an optical storage system A read channel apparatus is disclosed for reading data recorded on an optical storage system at a predetermined baud rate. The apparatus asynchronously samples an analog read signal generating from the optical storage system and subtracts an estimated DC offset from... | 05/01/2007 |
| 7212479 | Apparatus and method of detecting defects on optical recording media An apparatus of detecting defects on an optical recording medium includes a defect signal generating circuit for generating a corresponding defect signal according to a surface defect of the optical recording medium, a first synchronous signal generator for generati... | 05/01/2007 |
| 7196859 | Processing techniques for time-based servo patterns Techniques are described for accurately processing playback signals of time-based servo patterns recorded on a data storage medium. In particular, techniques are described for determining values for signal peaks within a playback signal of a time-based servo pattern... | 03/27/2007 |
| 7174351 | Method for deleting stored digital data from write-once memory device A digital storage system is coupled to a write-once memory array. File delete commands are implemented by over-writing a destructive digital pattern to at least a portion of the memory cells associated with the file to be deleted. One disclosed system alters the man... | 02/06/2007 |
| 7174087 | Playback apparatus and adaptive equalizing circuit with a phase-locked loop coupled thereto An equalizing circuit is provided for a playback apparatus not requiring tracking control. A playback signal is supplied to a plurality of unit delay devices which are connected in series, and the signals at the input ends and the output ends are supplied to weighti... | 02/06/2007 |
| 7167328 | Synchronizing an asynchronously detected servo signal to synchronous servo demodulation A first set of data is detected in a signal having synchronous samples and interpolated samples, wherein the first set of data is detected asynchronously as corresponding to one of the samples. A time to transmit a data-found signal is determined based on an offset ... | 01/23/2007 |
| 7164635 | Method of estimation parameter adaptability adjustment of an optical storage device A method of estimation parameter adaptability adjustment of an optical storage device. The method determines an estimation parameter according to a current data recording location of the optical storage device to estimate a channel bit rate. The method includes prov... | 01/16/2007 |
| 7161887 | Method and apparatus for extracting digital data from a medium A computer-implemented method and apparatus for extracting digital data from a medium. Digital audio extraction techniques are implemented with additional features that improve the quality of the resulting audio playback files. In one embodiment of the invention, a ... | 01/09/2007 |
| 7154835 | Digital signal processing method, data recording and reproducing apparatus, and data recording medium that are resistant to burst errors With two consecutive product-coded ECC blocks, EB1 and EB2, as a set, the rth row of first ECB block EB1 is followed by the rth row of second ECC block EB2 in such a way that the first row of first ECC block EB1 is followed by the ... | 12/26/2006 |
| 7139146 | Signal processing apparatus and method, and digital data reproducing apparatus A replay signal, obtained on reproducing a recording medium, on which has been recorded a digital signal, is supplied to an input terminal (1), and quantized by an A/D converter (8). The so quantized signal is processed by an integrator (20), fo... | 11/21/2006 |
| 7136242 | Servo writing substantially linear servo wedges to reduce overwrite effect in perpendicular magnetic recording A disk drive is disclosed comprising a disk having a plurality of servo sectors forming a plurality of substantially linear servo wedges extending from an outer diameter of the disk to an inner diameter of the disk, wherein each servo sector is written using perpend... | 11/14/2006 |
| 7136334 | Appliance for recording or playing back information having means for signal generation from a wobble signal The invention proposes an appliance for recording or playing back information having means for signal generation from a wobble signal which is scanned from the undulating track on a recording medium, such as a DVD+RW. According to the invention, a signal scanned fro... | 11/14/2006 |
| 7127662 | Method for recording address information on optical recording medium, optical recording medium including address information recorded thereon by the same method, and method for detecting address information recorded on the same optical recording medium A method for recording address information on an optical recording medium, an optical recording medium including address information recorded thereon by the same method, and a method for detecting the address information recorded on the optical recording medium. Phy... | 10/24/2006 |
| 7120105 | Recording medium, reproducing apparatus, and recording apparatus The present invention is associated with a recording medium in which, to a data part constituted by frames obtained by attaching a synchronous signal to the data divided by a predetermined data length, data having a preamble part and a postamble part attached with a... | 10/10/2006 |
| 7082091 | 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... | 07/25/2006 |
| 7065014 | Data reproduction control method for optical disk drive and an optical disk drive using the same In a method of controlling data reproduction in an optical disk drive, when a decoding error occurs, decoding is performed by changing a servo parameter. Thus, the decoding errors are reduced while playability is improved. The method of controlling data reproduction... | 06/20/2006 |
| 7027371 | Rewritable optical recording medium, recording method on the same, and optical disc recording/retrieving apparatus In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous ma... | 04/11/2006 |
| 7023782 | Dropout detection circuit and optical disc apparatus The dropout detection circuit of the invention includes: a high-speed envelope detection circuit for detecting an envelope of a reflection signal of a light beam with a first time constant; a low-speed envelope detection circuit for detecting an envelope of the refl... | 04/04/2006 |
| 7023789 | Playback device and storage medium for selective storage of data as a function of data compression method A playback device and a storage medium for storing audio data make it possible to increase the audio data volume that may be stored on such a storage medium without increasing the data density. To this end, the audio data compressed according to at least one compres... | 04/04/2006 |
| 7019922 | Apparatus and method to read information from a tape storage medium A method to read information from a tape storage medium, where that tape includes a calibration region and a data region. The method uses a read channel having a first detection mode and a second detection mode. The method initializes the first detection mode and fo... | 03/28/2006 |
