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| Number | Title | Issue Date |
| 8121015 | Optical disk drive device and method An optical disk drive device has an RF equalizer configured to generate an equalized RF signal by controlling a frequency characteristic of a delay time of an RF signal read out from an optical disk based on a control input signal, a playback clock extractor configu... | 02/21/2012 |
| 8054735 | Optical device To provide an optical disc device 1, and similar, equipped with a new mechanism to reduce laser light noise due to optical feedback. In an optical disc device 1 in which a laser diode is driven by a high frequency modulation method, optical feed... | 11/08/2011 |
| 7433292 | Optical disk system with delay-difference detector without delay lines Optical disk systems comprising photo detectors (1) for detecting optical disks comprising amplifiers and slicers (2-5) and delay-difference detectors (6) for detecting delay differences in sliced amplified detection signals are improved ... | 10/07/2008 |
| 7397753 | System and method for measuring signal deviation used in an optical recording/reproducing apparatus A method and system for measuring the signal deviation are applied to an optical recording/reproducing apparatus. The optical recording/reproducing apparatus comprises an optical pickup head for receiving Differential Push Pull (DPP) signals reflected from an optica... | 07/08/2008 |
| RE39811 | Musical information recording and reproducing technique for use with a recording medium having a UTOC area There is generated a rhythm corresponding to a designated tempo and meter of a music piece to be recorded. Performance of a musical instrument is started at specific timing according to the generated rhythm, and the musical information resulting from the performance... | 09/04/2007 |
| 7266666 | Method for fast verification of sector addresses The present invention relates to a method and a device for the fast verification of sector addresses in a data stream obtained from a recording medium upon a request from a microcontroller. According to the invention, the method comprises the steps of: reading the d... | 09/04/2007 |
| 7242651 | Disk reproduction device The invention provides a disk playback device wherein a disk (1) is irradiated with a laser beam from an optical head (4) to reproduce signals from the disk, and which comprises an external synchronizing signal producing circuit (8) and a delay ... | 07/10/2007 |
| 7224652 | Optical disc apparatus, information recording method, adjustment apparatus, adjustment method and fabrication method for optical disc apparatus, and method and apparatus for adjusting phase shift amount The present invention relates to an optical disc apparatus having a wobble signal detection circuit, an information recording method, adjustment apparatus and method for an optical disc apparatus, a fabrication method for an optical disc apparatus, and adjustment me... | 05/29/2007 |
| 7215632 | Signal processing apparatus and signal processing method An optical disc system comprises a gain offset unit for giving a gain and an offset to an inputted reproduction signal, an A/D converter, a peak detector, a bottom detector, an amplitude detector for calculating a signal, an offset detector for calculating a signal ... | 05/08/2007 |
| 7212486 | Optical disk device setting a gain of an amplifier so that a peak value and a bottom value of wobble signal components coincide In this optical disk device, a reflected light of a light beam reflected from a pre-pit-formed side of a track wobbled on a disk is detected as a first detection signal. A reflected light of the light beam reflected from the other side of the track is detected as a ... | 05/01/2007 |
| 7170834 | Method and circuit for detecting playback signal which is compensated for time delay A method of and a circuit for providing a playback signal, which is compensated for time delay, from a photodetector having a plurality of outputs. A time difference between a first signal corresponding to a part of the outputs of the photodetector and a second sign... | 01/30/2007 |
| RE39306 | Optical disc device An optical disc drive usable with discs to which data is continuously recorded and discs having a sector format can quickly resume playback signal output after passing imperfection causing potential reading errors, and plays disc with few read errors. A detection si... | 09/26/2006 |
| 7092347 | Optical pickup apparatus having disk thickness deviation correction and method therefor An optical pickup apparatus for compensating for the deviation in the thickness of the optical disk and method therefor. The optical pickup includes a light source which emits light, an optical path changer which changes a proceeding path of incident light, an objec... | 08/15/2006 |
| 7061853 | High-density optical pickup for rotating media An optical pickup is described with an electronically adjustable beam spot size for reading optical media. Two proximal light sources are impinged on a selected track of the media and the reflected light is registered by photodetector arrays. The electrical signal g... | 06/13/2006 |
| 7061837 | Digital-audio-signal recording apparatus Audio data are read out, via an ATAPI interface, from an audio CD set in a CD drive. Thus, even where an inexpensive low-speed CPU is used, high-speed copying can be performed. When audio data stored on a hard disk are to be reproduced, and if copying authorization/... | 06/13/2006 |
| 7054250 | Method and device for jitter enhancement in an optical disc system A method and device are provided for jitter enhancement in an optical disc system. The optical disc system generates a signal that includes an effective component having a first slew rate, and a pre-pit component having a second slew rate larger than the first slew ... | 05/30/2006 |
| 7042813 | Shock protection for compressed audio on a CD player A media player permits multiple compressed media files to be concurrently stored in memory interval to the media player. By concurrently buffering more than one compressed media file at a time, any mechanical disturbance that occurs during the playing of a file or b... | 05/09/2006 |
| 7023783 | Method of controlling data writing velocity and optical disk player The method of controlling data writing velocity of an optical disk player is capable of correctly writing data on a nonstandard optical disk as well as a standard optical disk. The method comprises the steps of: analyzing a track pitch of an optical disk on t... | 04/04/2006 |
| 7009921 | Method and circuit for detecting playback signal which is compensated for time delay A method and circuit for providing a playback signal which is compensated for time delay. The circuit includes a time delay compensator for detecting a time difference between outputs of a photodetector and temporally matching part of the outputs of the photodetecto... | 03/07/2006 |
| 6954418 | APPARATUS FOR ADJUSTING SIGNAL LEVELS DERIVED FROM AN OPTICAL DISC TO BECOME EQUAL TO A REFERENCE LEVEL DETERMINED FROM AT LEAST ONE OF THE SIGNAL LEVELS OF THE SIGNALS AND FOR SYNTHESIZING THE SIGNALS A plurality of light receiving detectors receive a plurality of segments of a beam returning from an optical disc when a reading beam of light is radiated to the optical disc. An optical pickup assembly produces a plurality of signals from the beam segments in accor... | 10/11/2005 |
| 6940799 | Method for generating a signal for detecting the direction of movement of a laser spot, and apparatus therefor A method and apparatus for detecting the direction of movement of a laser spot in an optical disc recording/reproducing apparatus having a photodetector divided into two or more sections, each of which is a light receiving device, aligned in a radial direction that ... | 09/06/2005 |
| 6928041 | Pre-pit detecting apparatus for optical recording medium A pre-pit detecting apparatus which, when a light beam is radiated onto an optical recording medium having a recording surface with pre-pits repeatedly formed between tracks, receives light reflected by the recording surface with first and second light receiving fac... | 08/09/2005 |
| 6924705 | Inject synchronous narrowband reproducible phase locked looped The invention discloses an injection synchronization narrowband regenerative phase-locked loop (ISNRPLL) circuit. The circuit includes a synchronous oscillation loop composed by the connecting of an injection synchronization narrowband regenerative voltage-controlle... | 08/02/2005 |
| 6898170 | PMAD/PSA digital feedback system A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to obtain digital feedback from a spin motor. The present invention includes detect... | 05/24/2005 |
| 6798731 | Optical pickup for and method of correcting aberration due to thickness variations of optical media An optical pickup apparatus for compensating for the deviation in the thickness of the optical disk and method therefor. The optical pickup includes a light source which emits light, an optical path changer which changes a proceeding path of incident light, an objec... | 09/28/2004 |
| 6791921 | Information recording medium which indicates information according to the wobbling of a track and information recording and reproducing apparatus An information reproducing apparatus includes a rotating portion to rotate an information recording medium on which information has been recorded by wobbling borders on both sides of a track with different phases; a beam irradiating portion for irradiating a beam sp... | 09/14/2004 |
| 6757638 | Component fault detection A technique that uses component data, such as servo encoder feedback data, and calculates real time histograms on a production printed wire board assembly (PWBA). If the histograms are uploaded to a main controller at specific intervals during run, aberrant servo ac... | 06/29/2004 |
| 6754159 | Reproduction arrangement, transmission arrangement, method of forming and transmitting coded information and method of reproducing coded information Reproduction arrangement for receiving information coded in accordance with a predefined standard, decoding the coded information and reproducing the decoding result. The reproduction arrangement may further receive and decode trigger information, which differs from... | 06/22/2004 |
| 6631104 | Apparatus for and method of adding information onto recording medium that enables additional recording An apparatus for recording first information onto a recording medium, successively to second information that has been already recorded on the recording medium is provided. The first and second information are divided into a plurality of blocks. Each bloc... | 10/07/2003 |
| 6560175 | Information recording medium which indicates information according to the wobbling of a track and information recording and reproducing apparatus An optical disk comprising a substrate, and a plurality of tracks formed on the substrate, wherein the plurality of tracks include groove tracks consisting of a plurality of grooves mutually space apart by a fixed space, and land tracks consisting of area... | 05/06/2003 |
| 6556523 | Wobble-signal detecting device and information recording apparatus A wobble-signal detecting device detects a wobble signal based on a signal which is the difference between outputs of two divisions of a light receiving device. These two divisions are located on both sides of a line parallel to a target portion of an inf... | 04/29/2003 |
| 6496470 | Disk reproducing apparatus having active wide-range PLL device This invention prepares two control voltage to be input to a VCO circuit. The first control voltage is used to continuously change the oscillation frequency of the VCO circuit. The second control voltage is used to continuously change the first control vo... | 12/17/2002 |
| 6493305 | Pulse width control circuit A pulse width control circuit is used to control the pulse with of a modulation signal to be written to a recording medium, such as a CD-R. The circuit controls both the leading and trailing edges of the modulation signal. The circuit includes a first del... | 12/10/2002 |
| 6442114 | Optical disk signal reproducing apparatus and crosstalk canceling system for use therein In a crosstalk canceling system for use in an optical disk signal reproducing apparatus, rough delay units roughly adjust a delay amount of reproduction signals and fine delay units finely adjust a delay amount with high precision, and a delay amount cont... | 08/27/2002 |
| 6434098 | Optical disc device An optical disc drive usable with discs to which data is continuously recorded and discs having a sector format can quickly resume playback signal output after passing imperfection causing potential reading errors, and plays disc with few read errors. A d... | 08/13/2002 |
| 6339581 | Disc player having a prepit detecting circuit A disc player having a prepit detecting circuit which can correctly detect prepits even if phases or amplitude levels of a plurality of read signals read out from a recording disc are deviated from each other. A phase difference between a first read signa... | 01/15/2002 |
| 6317396 | Tracking error generating device A tracking error generating device which is capable of correctly detecting a phase difference and generating a normal tracking error even when recording marks (or spaces) on an optical disc have short lengths. The tracking error generating device employs,... | 11/13/2001 |
| 6307823 | Optical information medium, optical information recording method and optical information recording apparatus Provided are an optical information medium, an optical information recording method and an optical information recording apparatus in which an accurate cross talk can be predicted with a simple structure in a recording mode such as CLV so that a disk havi... | 10/23/2001 |
| 6269059 | Apparatus for and method of adding information onto recording medium that enables additional recording An apparatus for recording first information onto a recording medium, successively to second information that has been already recorded on the recording medium is provided. The first and second information are divided into a plurality of blocks. Each bloc... | 07/31/2001 |
| 6192015 | Method and apparatus for recording and reproducing recording medium A recording/reproducing method and apparatus that is capable of driving a recording medium of land/groove recording system using a wobbling signal without a land/groove identification information. The method and apparatus detects the wobbling signal from ... | 02/20/2001 |
