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7633842 |
Apparatus for generating tracking error signal in optical disc drive
The present invention discloses an apparatus for generating a TE signal in an optical disc drive. The disclosed apparatus includes a signal generation module, a quality detection module coupled to...
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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...
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7616537 |
Focus search apparatus and method
Provided are a focus search apparatus and method for performing a focus search after moving an optical pickup to a focus-on point according to a signal output from a sine wave generator so that a...
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7613081 |
Control of stepper motor in an optical disc
A method for controlling a stepper motor in an optical disc system, comprising the steps of (A) measuring a static offset of a center error signal, (B) measuring a maximum value, minimum value and...
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RE40946 |
Optical disk apparatus
An optical disk apparatus comprises a focusing means for focusing a light beam on a recording medium having first and second information faces; means for moving a focal point of the light beam in a...
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7593295 |
Apparatus and method for compensating for defect of optical disc
An apparatus for and a method of compensating for a defect of an optical disc. The method includes: detecting a disc defect zone according to an RF sum signal level read from the optical disc;...
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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...
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7561501 |
Servo control device, optical disk drive, and servo control method
A servo control device couples with an optical pickup head, which outputs a TEZC (tracking error zero crossing) signal. The servo control device includes a detection module, a signal generation...
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7558170 |
Optical pick-up head, optical information apparatus, and optical information reproducing method
An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a...
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7518963 |
Phase difference detection circuit and optical disk device
A phase difference detection circuit that is formed by digital circuits having a small circuit area. In the phase difference detection circuit, the circuits for generating a tracking error signal...
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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;...
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7502286 |
Rotation correcting apparatus and optical disk apparatus
A rotation correcting apparatus has a tracking servo controller which generates a tracking signal to perform a tracking servo control for guiding an optical beam spot outputted from a pickup to...
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7486595 |
Tracking error detector
A tracking error detector receives laser light that is irradiated onto tracks on a disc surface and that is reflected from the tracks by using a light-receiving device having divided portions,...
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7471596 |
Optical disc reproduction device and tracking control method applied to an optical disc reproduction device
For automatic adjustment of tracking balance, a microprocessor controls a servo control unit to adjust a tracking balance signal value for the optical disc reproduction to be a mid-value between a...
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7466959 |
Apparatus and method for IF switching in a dual-tuner, dual-IF, HD radio and FM/AM radio receiver
In a dual-channel HD radio receiver, when the broadband filter channel is compromised, the broadband channel is inactivated and the narrowband channel is activated. By mixing the signals of the two...
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7463560 |
Optical disc device
In an optical disc device of the present invention, time differences among the focus error signal corresponding to the surface of the optical disc, the focus error signal corresponding to the first...
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7463563 |
Deficiency detecting apparatus for optical disk
The present invention provides a deficiency detecting apparatus that can accurately detect dusts and deficiencies on an optical disk even when an emitting power of a laser light source changes. The...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7260031 |
Digital focus and tracking servo system with one-track jump
A tracking and servo system with a one-track jump is disclosed. The one track jump algorithm holds a control signal from the tracking servo system. The one track jump algorithm adds an acceleration...
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7257055 |
Method and related apparatus for diagnosing crosstalk within an optical pick-up unit by utilizing firmware
A method and a related apparatus for diagnosing crosstalk within an optical pick-up unit by utilizing firmware. The method includes calculating a tracking driving signal and a focusing driving...
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7242646 |
Track locking method for optical disk drive and apparatus
A track locking method and an apparatus thereof enable an optical disk drive to rapidly and stably read data recorded on a target track from a seeking mode to a track locking mode. An optical...
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7239583 |
Tracking error detection apparatus
A tracking error detection apparatus comprises a phase difference detection circuit for receiving two sequences of digital signals, and performing phase comparison using a distance between...
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7224647 |
Method, apparatus, and medium for controlling a servo using a detected header field signal, and method, apparatus, and medium for detecting the header field signal
A method, apparatus, and computer readable medium controlling a servo of a recording and/or reproducing apparatus, using a detected header field signal. An optical recording and/or reproducing...
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7221638 |
Electronic circuit for decoding a read signal from an optical storage medium
The invention relates to an electronic circuit for decoding a read signal from an optical storage medium, the electronic circuit comprising a limit equalizer for amplification of high frequency...
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7218582 |
Optical disc drive
An optical disc drive is used to read and/or write data from/on an optical disc having a data storage layer. The drive corrects electrical offset while reading and/or writing data. The drive...
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7212474 |
Detecting anomalies in a scanning signal
An apparatus for scanning a track on a record carrier has a head ( 22 ) and front end circuitry ( 31 ) for scanning the track and generating scanning signals. A detection unit ( 32 ) detects...
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7206262 |
Optical disk recording/reproducing device
A moved distance detecting means ( 15 ) detects the moved distance in a tracking direction of an object lens, a position signal generating means ( 60 ) generates a position signal corresponding to...
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7180835 |
Data access method for improving performance of an optical disk drive
A data access method for improving performance of an optical disk drive is applied on a predetermined data access operation. A predetermined application program and the optical disk drive are used...
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7177244 |
Optical disc apparatus
There are provided a balance adjustment circuit ( 6 ) for adjusting levels of first and second detection signals from a tracking detector, a differential circuit ( 8 ) for generating a difference...
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7177245 |
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...
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7170833 |
Apparatus for scanning optical recording media using DPD tracking method with analog and digital delay elements
The present invention relates to an apparatus for reading from and/or writing to optical recording media, which has a tracking device, a four-quadrant detector, two summation points and a phase...
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7170831 |
Optical pickup astigmatism measuring method, optical pickup astigmatism adjusting method, and optical pickup astigmatism measuring system
It is an object of the present invention to provide an optical pickup astigmatism adjusting method capable of easily correcting an astigmatism even if the spot shape of a light beam converged on an...
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7164631 |
Information recording apparatus
An information recording apparatus is provided, which can control over the power of light beams emitted from a light source and various types of servo control with higher accuracy. A laser beam is...
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7142486 |
Signal processing method and signal processing apparatus
A signal processing apparatus is provided with a converter for converting at least one analog light detection signal into a digital light detection signal, and a signal generator for generating at...
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7133340 |
Optical disc apparatus
An optical disc apparatus in which the inclination of an optical axis of laser light relative to an optical disc is adjusted. When data is recorded, laser light is irradiated at recording power in...
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