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| Number | Title | Issue Date |
| 8116178 | Servo accelerator system for optical drives A method of operating a channel module, including: receiving a plurality of sensor signals generated based on at least one detected characteristic of a laser beam of an optical drive; performing computations based on the plurality of sensor signals; generating a com... | 02/14/2012 |
| 7995430 | Optical disk device and control method for the same Provided is an optical disk device capable of recording and/or reproducing information on optical disks with high reliability; and a method for controlling the optical disk device. The position of an optical lens where the amplitude of a reproduction signal during t... | 08/09/2011 |
| 7885151 | Servo accelerator system for optical drives A servo accelerator for an optical drive includes input and output (I/O) terminals that receive an input signal from a processor of the optical drive. An error circuit generates an error signal based on a sensed characteristic of a laser beam. A compensation circuit... | 02/08/2011 |
| 7804746 | Land/groove track and pickup head movement direction detection A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output... | 09/28/2010 |
| 7796480 | Apparatus and methods for light spot servo signal detection An apparatus for light spot servo signal detection for reading an optical recording medium having a plurality of non-writable areas between writable data areas containing address information. An optical pickup provides a light spot to the non-writable areas of the o... | 09/14/2010 |
| 7782724 | Information reproducing apparatus and method for measuring surface deflection The present invention relates to an information reproducing apparatus that includes an objective lens that focuses a light beam toward a rotating optical disc medium and uses the objective lens to focus the light beam onto the optical disc medium and detect the refl... | 08/24/2010 |
| 7773470 | Pickup control device, optical disk apparatus and pickup control method for the same A pickup control device includes a servo system which processes a first signal for error control read from an optical disk to generate a servo control signal. A clock signal is synchronized with the rotation of the optical disk. Two memories store a frequency compon... | 08/10/2010 |
| 7706219 | Signal processing apparatus and method for an optical disc drive A signal processing apparatus includes sample and hold units for holding a plurality of analog photo diode signals. A signal holding controller generates control signals to the sample and hold units for holding the analog photo diode signals. Analog adjusting module... | 04/27/2010 |
| 7668053 | Processing an information carrying signal An automatic gain control (AGC) controls the signal amplitude at the input to an analog to digital converter (ADC) input by applying a gain that produces a desired overall amplitude resolution of the patterns actually presented by the signal delivered by the ADC con... | 02/23/2010 |
| 7626899 | Method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method A method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method is disclosed. An optical pickup drive circuit controls a position of an optical pickup unit according to an optical pickup contro... | 12/01/2009 |
| 7583569 | Apparatus and related method for generating a tracking error signal in an optical disc drive The present invention discloses an apparatus for generating a tracking error signal in an optical disc drive. The disclosed apparatus includes: an analog-to-digital conversion module for receiving a plurality of analog signals generated by accessing an optical disc ... | 09/01/2009 |
| 7512043 | Apparatus and method for generating a tracking error signal in an optical disc drive The present invention discloses an apparatus and method for generating a tracking error signal in an optical disc drive. The method includes: receiving a first and a second analog signals; converting the first and the second analog signals into a first and a second ... | 03/31/2009 |
| 7409461 | Dynamic file-based routing in a broadband communications system Methods and systems consistent with the present invention provide broadband subscribers with dynamic, automatic routing information for accessing services offered by a service provider network (35) and/or content provider networks (40, 45). Client soft... | 08/05/2008 |
| 7397736 | Optical disc device and tracking controlling method therefor Disclosed is an apparatus which includes a tracking error detection circuit, for detecting tracking error signal from outputs of a photodetector, a peak/bottom detection circuit for detecting peak and bottom values of the tracking error signal, a difference circuit ... | 07/08/2008 |
| 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 |
| 7385896 | Focusing controller apparatus and method for an optical disk drive A focusing controller and the method thereof for an optical disk drive. The focusing controller includes a filter, a coupler and a focus compensator. The filter filters out a high-frequency component of the track error signal and derives an adjusted signal, while th... | 06/10/2008 |
| 7385887 | Address signal position detection apparatus, optical disk playback apparatus, and address signal position detection method The address signal position detection apparatus comprises a photodetector, a first and second adders which generate, from the output signals from the photodetector, two signal sequences whose phases change from each other according to a tracking error of a light spo... | 06/10/2008 |
| 7376054 | Disc reproduction device The present invention provides a disk playback device comprising a control circuit 7 for determining an optimum value of offset for a focus error signal based on amplitude values of a tracking error signal or an RF signal fed from an optical head 5, an... | 05/20/2008 |
| 7356311 | Wireless audio signal and control signal device and method thereof A signal transmission arrangement includes a signal transmitter and a signal receiver wirelessly communicating with the signal transmitter. The signal transmitter includes a hybrid signal device to hybridize the audio signal with the control signal to form a consoli... | 04/08/2008 |
| 7352837 | Digital phase-locked loop A phase-locked loop includes a variable frequency generator, a comparator and a counter. The variable frequency generator is configurable for generating an output signal having a frequency which varies based at least in part on at least first and second control sign... | 04/01/2008 |
| 7345964 | Method and related apparatus for deriving a tracking error signal A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal. The method includes summing the first analog detection signal and the second analog detection signal to generate an analog sum signal. An ana... | 03/18/2008 |
| 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 |
| 7338168 | Particle analyzing system and methodology An imaging system, methodology, and various applications are provided to facilitate optical imaging performance. The system contains a sensor having one or more receptors and an image transfer medium to scale the sensor and receptors in accordance with resolvable ch... | 03/04/2008 |
| 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 |
| 7324419 | Focus control via AC input signal A method of mapping a surface of a printable medium comprises illuminating the surface with electromagnetic radiation and focusing the electromagnetic radiation with a focusing means. The method also includes modulating the position of the focusing means using an ac... | 01/29/2008 |
| 7315491 | Disk driving apparatus and information readout method with selective servo control for read-out destinations of lands and grooves A disc driving apparatus and an information readout method according to the present invention realize optimum servo control of a readout unit in reading out the information from a recording medium having lands and grooves. The disc driving apparatus includes a unit ... | 01/01/2008 |
| 7313057 | Method for adjusting a control parameter and optical disc drive server system using the same A method for adjusting a control parameter is adopted in an optical disc drive server system, which has a compensator, a control loop and a parameter regulator. The control loop includes an optical pickup and outputs a first tracking error signal/focus error signal.... | 12/25/2007 |
| 7310297 | Optical disk device This invention provides an optical disk device comprising an optical pick-up being structured to irradiate light beams onto an optical disk through an objective lens unit, receive the light beams reflected from the optical disk by a two-divided light-receiving eleme... | 12/18/2007 |
| 7307930 | Optical disk apparatus An optical disk apparatus includes a digital signal processor, a photo-detector circuit, and a sample-and-hold circuit. By using a sampling-timing signal generated by the sampling-timing signal based on a sampling-timing signal transmitted from the digital signal pr... | 12/11/2007 |
| 7304919 | Optical information reproducing apparatus having a servo control circuit In a CLV(constant linear velocity) or MCLV(substantially constant linear velocity)-type optical disk apparatus, instability of servo at inner and outer circumferences of an optical disk is prevented by adjusting a servo-loop gain of tracking servo control or focus s... | 12/04/2007 |
| 7304918 | Servo error signal generation circuit and servo error signal generation method A servo error signal generation circuit comprises a first sampling unit for sampling first detection signals at first sampling timings, a second sampling unit for sampling second detection signals at second sampling timings which are obtained by periodically thinnin... | 12/04/2007 |
| 7301863 | Method and device for canceling a land-groove offset component of a focusing error signal in an optical storage system A device for canceling a land-groove offset component of a focusing error signal in an optical storage system includes first and second circuits, and an adder. The first circuit processes a radio (or wobble) frequency ripple signal to obtain a first processed signal... | 11/27/2007 |
| 7295496 | Method of improving readability in optical drives A method of improving readability in an optical drive is disclosed. In one aspect, the present disclosure teaches a method of improving readability in an optical drive including monitoring a compact disc (CD) media for tracking errors using a differential push-pull ... | 11/13/2007 |
| 7289399 | Tracking error detection apparatus including reduction in false tracking error detection during phase error detection A tracking error detection apparatus comprises a photodetector comprising plural photoreceptor elements; zerocross detection circuits for detecting zerocross points at which two sequences of digital signals intersect the center levels of the respective digital signa... | 10/30/2007 |
| 7280448 | Positioning control device and positioning control method A positioning control device and method in which the relative position error in tracking is reduced by using the periodicity of position shift. The positioning control device comprises a position detecting unit for measuring the relative position error between the d... | 10/09/2007 |
| 7277378 | Offset adjusting circuit for optical disc and offset adjusting method An offset adjusting circuit for an optical disc comprises a plurality of offset-adjustment differential operational amplifiers, each of the amplifiers having an input terminal to which an output signal of an optical pickup is input and another input terminal to whic... | 10/02/2007 |
| 7277363 | Magneto-optical recording or reproducing device A magneto-optical recording or reproducing device having an information erasing means for erasing information or data recorded on a magneto-optical recording medium. According to the invention, the information erasing means comprises an erasing magnet having a field... | 10/02/2007 |
| 7274636 | Phase locked loop for generating an output signal A phase locked loop (PLL) for generating an output signal according to an input signal is disclosed. The PLL of the present invention includes a detector for generating a detection signal according to the logical difference between the input signal and a feedback si... | 09/25/2007 |
| 7266062 | Noise removal using 180-degree or 360-degree phase shifting circuit A noise removal circuit of the present invention comprises a 180-degree odd multiple shifting section for outputting a 180-degree shifted signal that is phase-shifted from an input signal by an odd multiple of 180 degrees and difference output section for outputting... | 09/04/2007 |
| 7263049 | Semi-synchronous receiver and apparatus for reading information A receiver is described for delivering a data sequence (ak) at a data rate 1/T from an analog signal (Sa), the receiver comprising: a) converting means (40) for generating a received sequence (rn) by sampling the analog signal (Sa) with a sample rate of 1/Ts,... | 08/28/2007 |
