Samsung Electronics Co., Ltd.

Chang-Sup Shim

Yun-Je Oh

Seong-Taek Hwang

Jun-ho Koh

Jae-Hoon Lee

Sang-Ho Kim

Kwang-pyo Choi

Young-Jip Kim

Byoung-Dai Lee

Gyu-Woong Lee

Kwan-Lae Kim

Kwan-Soo Lee

Sung-Jin Park

Chan-yul Kim

Dae-Kwang Jung

Sung-dae Cho

Hyun-Chul Kim

Sang-Wook Oh

Young-hun Joo

Hong-Seok Shin

Yong-gyoo Kim

Sung-Dae Cho

Tae-Soo Lee

Yong-Deok Kim

Jeong-Seok Choi

Kyung-Ho Chae

Jeong-rok Park

Young-O Park

Dong-Jae Shin

Ji-Wuck Jung

Do-Hun Cha

Du-Chang Heo

Bong-Gon Kim

Provided is a data receiving device and method for shortening a channel switching time in a DMB system. The device includes a CDM channel for receiving a broadcasting signal from a DMB satellite, demodulating the broadcast signal, and generating a MPEG2-TS packet. a GOP buffer for receiving the MPEG2-TS packet, checking whether or not the received MPEG2-TS packet is a key frame, and, when it is determined that the received MPEG2-TS packet is the key frame, initializing the buffer and storing the received MPEG2-TS packet as a GOP unit, a channel switch for switching a channel of a DMB service to the GOP buffer, an A/V reproducing buffer for buffering a predetermined amount of A/V data to reproduce the A/V data of the GOP buffer; and an A/V decoder for receiving and decoding the A/V data.

Data receiving device and method for shortening channel switching time in digital multimedia broadcasting system

A method for transmitting video data to the users via a network in a transcoder of an image processing system including a storage media having a predetermined amount of storage area is disclosed. The method includes the steps of storing in the storage media, the video data provided based on the corresponding services, monitoring a traffic condition of the network to determine if transcoding is necessary; transmitting the stored video data to the corresponding users, respectively, via the network, when the transcoding is not necessary; and transcoding the stored video data to transmit the video data to the corresponding users, respectively, when the transcoding is necessary. The video data provided is based on the corresponding services includes image information having the highest quality of service from a content provider.

Optical network for bi-directional wireless communication

A method of upgrading software through a software download in a Terrestrial Digital Multimedia Broadcasting (T-DMB) terminal includes the steps of announcing when the software is downloaded by receiving a T-DMB signal and analyzing a plurality of fast information groups (FIGs), determining whether the software is downloaded, storing ensemble information and download start time information; matching a current ensemble with the stored ensemble when time according to the download start time information elapses, and confirming a signaling message for informing that the software is downloaded and downloading the software.

Method of upgrading software through download in T-DMB terminal

Disclosed are methods and devices for adjusting an image color in an image projector. In one aspect, the method for adjusting an image color in an image projector, includes the steps of obtaining information on an external image projection environment to determine color conversion information for adjusting the color of a projection image and converting the color of an image to be projected using the determined color conversion information to project the image. The device for adjusting a projection image color in a mobile communication terminal provided with an image projector, includes an image projector for performing an image projection function under the control of a controller, a camera for performing a camera function under the control of the controller; and the controller for obtaining color information of an external screen on which an image is projected through the camera, and adjusting the color of an image to be projected onto the image projector using the color information.

Method and device for adjusting image color in image projector

Disclosed is a method for depacketization of multimedia packet data, the method comprising: a context-aware step of parsing and recording a start code, which can identify each frame, in a first portion of a payload of a real-time transport protocol (RTP) packet; and a step of performing depacketization according to each packet by using the start code.

Method for depacketization of multimedia packet data

Disclosed is an apparatus and method for constructing and broadcasting a multi-screen broadcasting program by using a transport stream in a digital broadcasting, and for decoding the constructed transport stream to restore image and voice signals. The method includes the steps of analyzing a program access table (PAT) of broadcasting data to determine whether there are at least two image packets, performing signal decoding when the input broadcasting data is a single screen program having one image packet, performing a multi-decoding when the input broadcasting data is a multi-screen program having at least two image packets.

Apparatus for receiving transport stream to provide multi-screen and control method therefor

A network system for interworking a Wireless Local Area Network (W-LAN) and a 3-Generation (3G) mobile communication network through a Radio-over-Fiber(RoF) link and an authentication method in interworking in the network system are provided. The network system includes a 3G mobile communication network and a W-LAN system. The 3G mobile communication network includes a voice signal processing network connected to a Public Switched Telephone Network (PSTN) for voice call processing with respect to a predetermined mobile terminal, a packet data network for data communication with the predetermined mobile terminal, and a terminal device for communication with the predetermined mobile terminal. The W-LAN system is connected to the packet data network of the 3G mobile communication network to provide a W-LAN service to the predetermined mobile communication terminal. The W-LAN system is implemented in a plurality of Base Transceiver Stations (BTSs) included in the 3G mobile communication network through the RoF link.

Network system for interworking W-LAN and 3G mobile communication network through RoF link and authentication method according to interworking in the network system

A multimedia signal matching system for performing a picture-in-picture function includes: at least one set-top box including a decoder for decoding multimedia signals in a predetermined reference format and generating a control signal for performing the picture-in-picture function; and a multimedia matching device for receiving multimedia signals in various formats from a broadcast communication network and the control signal from the set-top box, processing the received multimedia signals into signals with the predetermined reference format responsive to the control signal.

Multimedia signal matching system and method for performing picture-in-picture function

A terrestrial DMB receiver using an imaginary channel in a terrestrial DMB system is disclosed. The terrestrial DMB receiver includes: a key input unit for receiving an input from a user; a display unit for providing image output to the user; an imaginary channel storage unit for storing information on imaginary channels designated to each broadcasting service by the user; a DMB receiving unit for receiving terrestrial DMB broadcasting; a MCI/SI analyzer for analyzing MCI and SI of FIC information from a DMB broadcasting signal received through the DMB receiving unit; and a controller for searching for the imaginary channel storage unit according to values of number keys input from the key input unit, extracting service IDs, controlling the DMB receiving unit to select broadcasting services according to the extracted service IDs, checking the information analyzed through the MCI/SI analyzer, and performing an update for the imaginary channel storage unit.

Terrestrial DMB receiver using imaginary channel to receive broadcasting services

A media server coupled to a service network by means of a media gateway provides network-adaptive media streams through hybrid monitoring for the digital home service. Clients coupled to the service network measures a network state of the service network and system states of the clients through the hybrid monitoring. A monitoring server includes a domain manager and receives metric information fed back from the clients, performs comparison and analysis with respect to the received measurement information, determines causes of quality degradation of the digital home service, and delivers indication information according to the causes to the media server and the media gateway. The domain manager also determines a problem of the media streams according to a predetermined policy and an analysis result of the condition-analyzing unit and for creating the indication information in order to solve the problem.

Dynamic quality-of-service mapping apparatus and method through hybrid monitoring in digital home service

An optical transmitter for generating return-to-zero alternative-mark-inversion (RZ-AMI) optical signals and a method for generating the optical signals are provided. The optical transmitter includes a light source radiating at its output an intensity-modulated light beam based upon intensity of a first data, a precoder for precoding a second data having the information identical to the first data, and a Mach Zehnder modulator for phase-modulating the intensity-modulated light on basis of the precoded second data to generate a return-to-zero alternative-mark-inversion (RZ-AMI) optical signal.

Return-to-zero alternative-mark-inversion optical transmitter and method for generating return-to-zero alternative-mark-inversion optical signal using the same

A wavelength-division multiplexing passive optical network (WDM-PON) comprising a central office for generating monitor light and multiplexed downstream optical signals to be out and detecting upstream optical signals, the central office including a signal monitoring unit monitoring based on fed-back monitor light if the wavelengths of the upstream optical signals and the wavelengths of the downstream optical signals change, a plurality of subscriber units for detecting corresponding downstream optical signals and generating upstream optical signals, a remote node for reflecting the monitor light to the central office, de-multiplexing multiplexed downstream optical signals so as to output the downstream optical signals to the corresponding subscriber units, and multiplexing the upstream optical signals so as to output the upstream optical signals to the central office, a first optical path for linking the central office to the remote node, and a plurality of second optical paths for linking the remote node to the subscriber units, respectively.

Wavelength-division multiplexing passive optical network

Disclosed is a passive optical network comprising a central office including a plurality of first reflective semiconductor optical amplifiers of a quantum-dot type, each of which generates a wavelength-seeded downstream optical signal on a downstream channel of a corresponding wavelength, a plurality of optical network units each of which includes a second reflective semiconductor optical amplifier of a multi-quantum-well type, the second reflective semiconductor optical amplifier generating a wavelength-seeded upstream optical signal on an upstream channel of a corresponding wavelength and a remote node for outputting the downstream optical signals to corresponding optical network units, and multiplexing and outputting the upstream optical signals to the central office.

Passive optical network

In a digital broadcasting system comprising a server for retransmitting a digital broadcast on the basis of an Internet protocol (IP), a user terminal for receiving the digital broadcast on the basis of the IP, and a router for connecting the server with the user terminal, the server performs a method for providing the broadcasting channel information that includes the steps of dividing a broadcasting stream to be transmitted to the user terminal into the broadcasting channel information and other information excluding the broadcasting channel information by demultiplexing the broadcasting stream and extracting the broadcasting channel information from the divided broadcasting stream, converting the extracted broadcasting channel information into IP-based broadcasting channel information by inserting the Internet protocol information for each broadcasting channel into the extracted broadcasting channel information, and remultiplexing the IP-based converted broadcasting channel information and the other information and transmitting the remultiplexed information to the user terminal.

Apparatus for providing broadcasting channel information in internet protocol based digital broadcasting system and method thereof

A metro wavelength division multiplexing network is disclosed and includes a plurality of optical repeaters connected to each other through an optical fiber link, wherein each of the optical repeaters includes a Raman gain medium for Raman-amplifying inputted optical signals, an amplification medium having a center wavelength different from a gain center wavelength of the Raman gain medium and amplifying a Raman-amplified optical signals, and a pumping unit for pumping the Raman gain medium.

Growing community of inventors

Seoul, South Korea

Chang-Sup Shim