Samsung Electronics Co., Ltd.

Joong-eon Seo

Kyung-geun Lee

In-sik Park

Byung-in Ma

Jung-wan Ko

Chong-sam Chung

Jang-hoon Yoo

Seong-sin Joo

Soo-yul Jung

Yoon-woo Lee

Seong-il Cho

Byoung-ho Choi

Woo-sik Eom

Yong-seock Yoon

Sung-hee Hwang

Jung-Wan Ko

Jae-seong Shim

Ki-Hyun Kim

Dong-jin Lee

Soo-han Park

Chang-jin Yang

Sung-hyu Han

Bong-gi Kim

Byung-jun Kim

Sung-ro Go

Jin-hoon Jeon

Ichiro Morishita

Young-im Ju

Nam-joon Park

Dong-hae Yeom

Sang-hyun Ryu

An auto stabilization method and a photographing apparatus using the same are provided. The photographing apparatus having the auto stabilization function includes a voice coil motor actuator (VCMA) to move a photographing element. In the generation of hand tremor, the photographing apparatus controls compensating of the hand tremor. Because one or more dynamic characteristics according to a structure of the VCMA is considered, saturation or delay of displacement of the VCMA is avoided, and a clearer image is provided.

Auto stabilization method and photographing apparatus using the same

An aspheric lens includes at least one aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65&#xb0;. The aspheric lens surface is given by the equation where L&#x2260;0, c is a curvature, r=x+y, K is a conic integer, and L and A through J are aspheric coefficients.

Aspheric lens and optical pickup including the same

An apparatus for recording data on and reproducing data from the disk in which a recording area is divided into sectors, includes a reproducing signal generator for generating a reproducing signal including sum signals Vand Vof radial pairs, a sum signal RF_sum, and a push-pull signal RF_pp from an optical signal reflected from the disk, a header area detector for generating a header area signal including a header area from the reproducing signal, a first synchronous signal level detector for detecting a magnitude Ivfoof a first synchronous signal in the first header by being synchronized with the header area signal, a second synchronous signal level detector for detecting a magnitude Ivfoof a second synchronous signal in the second header by being synchronized with the header area signal, and a balance calculator for calculating the balance of the magnitude Ivfoand the magnitude Ivfo

Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error

A method of and an apparatus for online modification/update of a database using a recordable optical disc. A user apparatus having a version of a database and an update date and time stored on the recordable optical disc communicates with a server which stores information for updating the database and an update date and time. A comparison of the respective dates and times is made and the server transmits updated information to the user apparatus based on the comparison. In one embodiment, the user apparatus transmits the update date and time stored on the recordable optical disc, the server makes the comparison and transmits the modified/updated information based on the comparison. In another embodiment, the user apparatus acquires the update date and time stored on the server, makes the comparison and acquires modified/updated information from the server based on the comparison.

Method of and apparatus for updating a database using a recordable optical disc

A plurality of types of writable discs on which wobbles having a predetermined frequency containing absolute addresses and/or various pieces of information on the writable discs can be discriminated by controlling only focusing and using an amplitude of a wobble signal or a wobble PLL lock signal that has passed through a phase locked loop. Accordingly, a discrimination time can be reduced and a disc in an unrecorded state can also be discriminated.

Method of and apparatus for differentiating between writable disc types

A method of determining a type of a disc for a disc system to record/reproduce a plurality of recordable discs having different track pitches, including detecting a plurality of signals for determination while moving an objective lens up or down and simultaneously making the objective lens vibrate in a radial direction of the disc, and determining the types of the discs having different track pitches by using the detected signals for determination.

Method and apparatus of determining a type of disc

An optical recording medium storing information for regarding data in the current sector as data in a linking loss area, and an apparatus and method providing linking data. The data link method includes dividing an error correction code block having a predetermined size into a plurality of sectors and checking data type identification information which indicates whether or not data in each sector is linking data; and replacing main data of a sector with predetermined data according to the result of checking the data type identification information. According to the above method, data type information is checked to determine whether or not to replace main data of the current sector with dummy data. By doing so, error occurrence of the prior art can be prevented and block error correction is carried out more effectively.

Recording medium storing link information and apparatus and method for linking data

A method of detecting a servo error, an apparatus therefor, a disk which maintains quantity of a servo error signal, a method of controlling a servo of an apparatus for recording data on and reproducing data from a disk, a method of detecting the tracking error, and a method of detecting tilt error of the apparatus. The apparatus for recording data on and reproducing data from the disk in which a recording area is divided into sectors, each sector has a header for indicating an address, each header has a first header and a second header which are recorded to deviate from the center of the track in opposite directions, and the first header and the second header have address areas in which the addresses of sectors are recorded and synchronous signal areas in which synchronous signals for detecting the address signals recorded in the address area are recorded, includes a reproducing signal generator for generating a reproducing signal including sum signals Vand Vof radial pairs, a sum signal RF_sum, and a push-pull signal RF_pp from an optical signal reflected from the disk, a header area detector for generating a header area signal including a header area from the reproducing signal received from the reproducing signal generator, a first synchronous signal level detector for receiving the output of the reproducing signal generator and detecting a magnitude Ivfoof a first synchronous signal in the first header by being synchronized with the header area signal received from the header area detector, a second synchronous signal level detector for receiving the output of the reproducing signal generator and detecting a magnitude Ivfoof a second synchronous signal in the second header by being synchronized with the header area signal received from the header area detector, and a balance calculator for calculating the balance of the magnitude Ivfoof the first synchronous signal detected by the first synchronous signal level detector and the magnitude Ivfoof the second synchronous signal detected by the second synchronous signal level detector. As a result, it is possible for the recording/reproducing apparatus to stably control a servo therein and maintain an optimal recording/reproducing state since the apparatus for detecting the servo error correctly detects the servo error state of the disk.

METHOD FOR DETECTING SERVO ERROR, APPARATUS THEREFOR, DISK WHICH MAINTAINS QUALITY OF SERVO ERROR SIGNAL, METHOD OF CONTROLLING SERVO OF DISK RECORDING/REPRODUCING APPARATUS, METHOD OF DETECTING TRACKING ERROR, AND METHOD OF DETECTING TILT ERROR

A maximum error region determining unit determines a region having a maximum likelihood of error from a channel signal y(t). An optimal path searching unit uses only an error signal at the region having a maximum likelihood of error to find a minimum error generation path and to correct the error signal. A signal recovery unit applies a predetermined algorithm to the channel signal y(t) in which a part of the signal has been corrected by the optimal path searching unit in order to recover an original recorded signal a. The signal processing apparatus and method search for an optimal path of a channel signal only in the maximum error generation region, thereby reducing complexity and simplifying implementing hardware while allowing for signal processing without change in hardware where changes in a channel model or conditions of an input signal occur.

Apparatus and method for signal processing

An eccentricity compensating apparatus of a disk drive servo system using frequency response characteristics of an actuator actuating a head to a position on a disk to read data on or reproduce data from the disk. The apparatus includes an error detector that detects a position error between a reference head position and an actual position of the head on the disk and a first compensation controller that receives the position error from the error detector and changes the actual position of the head to compensate for the position error. The apparatus also includes a second compensation controller that generates and outputs a control value to compensate for eccentricity which varies depending on a phase of a spindle that rotates the disk, and a gain/phase adjuster that adjusts gain and phase of the control value output from the second compensation controller according to a disk reproduction speed, wherein a drive signal of the actuator is obtained by summing together signals output from the first compensation controller and the gain/phase adjuster. Thus, the eccentricity compensation apparatus compensates for eccentricity at varying reproduction speeds by adjusting control data estimated for eccentricity compensation at specific reproduction speed based on frequency response characteristics of an actuator.

Eccentricity compensation apparatus based on frequency response characteristics of an actuator of a disk drive servo system

A disk drive servo system for eccentricity compensation and a method thereof includes an error detector detecting a position error between an actual position and a predetermined nominal reference position of a turntable actuator, a feedback unit generating and outputting a first control value to compensate for the position error received from the error detector, a learning controller calculating, storing, and outputting a second control value to compensate for eccentricity at one or more predetermined speeds of the disk drive, and a gain/phase adjustor providing gain and phase compensation information corresponding to the second control value of the learning controller according to frequency response characteristics of the turntable actuator at the one or more predetermined speeds. Accordingly, the eccentricity of the turntable actuator can be effectively compensated, thereby improving a lead-in performance, a tracking performance, and a high-speed seeking performance of the disk drive servo system with respect to the disk eccentricity.

Disk drive servo system for eccentricity compensation and method thereof

A differential phase detection device receives first through fourth detection signals from a photodetector and detects a differential phase signal therefrom, the differential phase detection device includes a slicer slicing and digitizing each of the detection signals with respect to a reference level. A synthesizer synthesizes the digitized detection signals and generates therefrom synthesis signals. A phase difference detector compares phases of the synthesis signals and outputs a first phase difference signal and a second phase difference signal. A matrix circuit processes the first and second phase difference signals to output the differential phase signal.

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Gyeonggi-do, South Korea

Joong-eon Seo