Samsung Electronics Co., Ltd.

Other

Korea Advanced Institute of Science and Technology

Korea Chemical Co., Ltd.

Pulsus Technologies

Bong Joo Kim

Yong Hee Lee

Sung Kyoon Kim

Jin Hyung Lee

Hyun Yong Choi

Jae Hoo Park

Sang Hak Kim

Boo Keun Yoon

Gi Hyun Tae

Myung-Jin Lee

Hong Kyun Yim

Jae Yong Eum

Moo Yeol Choi

Moon Hwa Chang

Sung-No Lee

Yong Hun Cho

Won S Kim

Un Ju Lee

Kwan Kyu Lee

Young Yun Seol

Woan J Kim

Seung Bin You

Jun Tae Park

A multi-channel audio signal converting device using a time-varying digital filter, an electronic system including the same, and a method of converting an audio signal using the time-varying digital filter are provided. The multi-channel audio signal converting device includes a first signal channel and a second signal channel configured to perform analog-to-digital conversion or digital-to-analog conversion using a first clock signal; and a first time-varying filter configured to synchronize a digital audio signal synchronized with a second clock signal different from the first clock signal with the first clock signal and to input the digital audio signal to the second signal channel when digital-to-analog conversion is performed or to synchronize an output signal of the second signal channel with the second clock signal when analog-to-digital conversion is performed.

Multi-channel audio signal converting device using time-varying digital filter, electronic system including the same, and method of converting multi-channel audio signal

Disclosed is a lifting device for a display apparatus that may include a tilting unit to allow a user to easily adjust a viewing angle of the display apparatus. The lifting device may include a wire connected to the display apparatus, and at least one tilting unit to adjust a viewing angle of the display apparatus. The tilting unit may include a rotatable arm to adjust a distance between a wall and the display apparatus, and a rotation obstructer to provide the arm, which may be supported on both the wall and the display apparatus, with a force counter to a force applied by the display apparatus to the wall when no external force is applied.

Lifting device for display apparatus

A method and system process a signal for PWM modulation. An amplitude control signal adjusts the amplitude of an input signal, and an offset is added to the amplitude-adjusted signal to produce an offset-adjusted signal. The offset is selected according to the amplitude adjustment applied to the input signal. The offset-adjusted signal is pulse-width modulated the to produce a pulse-width modulated signal, and the pulse-width modulated signal is filtered to reduce high frequency components thereof.

Method and device including signal processing for pulse width modulation

An optical disc drive includes a traverse deck having left and right sides to be balanced. The optical disc drive includes a main deck, a tray, a turntable, an optical pickup, a traverse deck, and a balancer. The optical pickup is mounted movably in the back-and-forth direction to emit light to an optical disc placed on the turntable to read and write information from and to the optical disc. On the traverse deck, the turntable is mounted at the front side of the traverse deck and the optical pickup is mounted movably in the back-and-forth direction. The balancer is mounted on the traverse deck to balance the weights of the left and right sides of the traverse deck.

Optical disc drive having a balancer mounted on a deck

A three-level half-bridge PWM amplifier includes a PWM generator and an output stage. The PWM generator changes a width of a pulse at a first level or a second level according to amplitude of an input signal and outputs a three-level PWM output signal having the first level, the second level, and a reference level. The output stage drives an output node connected to a terminal of a load to a first power supply voltage, a second power supply voltage, or a third power supply voltage based on the three-level PWM output signal. Accordingly, unnecessary static current consumption is reduced, thereby increasing efficiency.

Three-level half-bridge pulse-width modulation amplifier and method of driving the same

A lifting device used to fix the display apparatus to a wall. The display apparatus can be formed in a rear surface thereof with a plurality of holes. The lifting device includes a wire having both ends coupled to any one pair of holes of the plurality of holes, and a wire hanger fixed to the wall and used to hang the wire on the wall.

Lifting device of a display apparatus

An electrical power line insulator has an end clamp with a saddle for supporting an electrical wire, a track provided on a front surface of the saddle, a keeper for compressing and supporting an electrical wire seated in the saddle, a bolt and a nut for fastening the keeper to the saddle and operable to horizontally move the keeper along the track, and an insulator housing secured to the end clamp and mounted on a support structure. The end clamp and the insulator housing are detachably assembled with each other by means of a cylindrical clamp base integrally provided on a lower portion of the saddle and the track of the clamp and an upper fitting part. The upper fitting part has an assembly cylinder provided on an upper portion of the fitting part to be connected to the cylindrical clamp base, a compression cylinder provided on a lower portion of the fitting part and pressed against a post of the insulator housing, and a bolt and a nut fastening the cylindrical clamp base of the clamp to the assembly cylinder of the upper fitting part.

Electrical power line insulator with end clamp

The present invention relates to an audio amplifier using a pulse width modulation, and more particularly, to a pulse width modulation type audio amplifier which an average switching frequency or a cutoff frequency of a low pass filter is variable in accordance with frequency of input signal. The present invention has a method for using average switching frequency of an output pulse by lowering the average switching frequency in accordance with the bandwidth of the input audio signal for relative narrow bandwidth than that of an input audio signal having a usual bandwidth of 20 kHz like as a pulse width modulation type radio signal and a low bandwidth signal for a subwoofer, a method for lowering a cutoff frequency of a low pass filter for restoring an output pulse to a continuous time signal together an average switching frequency of the output pulse, and a method for using respective average switching frequencies different to each other for each channel having respective different bandwidths in a multi-channel amplifier. By using the average switching frequency as lower as possible in accordance with the bandwidth of the input audio signal, the power efficiency is enhanced and the electromagnetic interference affecting peripheral devices can be minimized.

Pulse width modulation type audio amplifier having variable average switching frequency

A deck mechanism for a magnetic recording/reproducing apparatus and which includes a main deck where a head drum is installed, and a sub-deck which moves with respect to the main deck and where a reel table is installed. A slide member is provided between the main deck and the sub-deck and moves by a cam gear and selectively operates a pole base, brake and pinch roller.

Magnetic recording/reproducing apparatus deck mechanism with component

A crystalline polyester resin derived from the reaction between a prepolymer and trimellitic anhydride in an amount of less than 10 wt % of the prepolymer where prepolymer as an intermediate product formed from the reaction between an alcohol mixture containing at least 40 mole % ethylene glycol and at least 30 mol % neopentyl glycol, and an acid mixture containing terephthalic acid or dimethyl terephthalate of at least 40 mole % and a linear dicarboxylic acid, or between an alcohol mixture containing 100 wt % terephthalic acid or dimethyl terephthalate. The crystalline polyester resin is very suitable for use in powder coating compositions and has a hyodroxyl number of 20 to 100, an average molecular weight of 1000 to 3500 and a melt viscosity at 160.degree. C. of 500 to 4000 cps as well as the characteristics of dense, regular, and repetitive structure.

Process for preparing hydroxyl polyester for use in a powder coating and

The present invention relates to an improved process for producing cephalosporin derivatives of formula (I), the 3-position of which being substituted by acetoxymethyl or tetrazolylthiomethyl and the 7-acyl group of which being substituted by D-mandelic acid derivatives, which comprises simultaneously reacting the compound of formula (III) with the compound of formula (IV) in the presence of a compound of formula (II) and anamine in high yield, ##STR1## wherein, R.sup.1 is hydrogen or ##STR2## R.sup.2 is methyl, ethyl, propyl or phenyl, X is ##STR3##

Growing community of inventors

Seoul, South Korea

Bong Joo Kim