Abstract:
본 발명은 동영상 부호화에 관한 것으로서, 특히 무선 통신망을 통해 동영상 부호화 데이터를 송수신하는 장치가 무선 채널 환경을 고려하여 비트율을 제어하는 방법에 관한 것이다. 본 발명에 따른 동영상 데이터 송수신장치는 무선 통신망에 연결되어 데이터를 송수신하는 장치에 있어서, 무선 채널 환경을 분석하는 채널상태 분석부, 상기 채널상태 분석부로부터 수신한 무선채널 환경을 고려하여 양자화 파라미터, 프레임의 생략 여부, 프레임 종류설정, 에러강인화도구(ERT, Error Resilient Tool)사용 여부에 대한 정보를 포함하는 제어정보를 생성하는 부호화 제어부, 상기 부호화 제어부로부터 수신한 제어정보에 기초하여 입력된 동영상 데이터를 부호화하는 동영상 부호화부, 부호화된 동영상 데이터를 무선채널을 통해 외부로 전달하는 데이터 송수신부를 포함한다. 동영상, 부호화, 실시간, 무선망, 채널, 제어
Abstract:
PURPOSE: A storage file format of a multimedia stream file, storage method, and client apparatus using the same are provided to reproduce multimedia data in an offline state by storing multimedia data provided through an adaptive streaming service. CONSTITUTION: A communication unit(630) receives a multimedia stream file including encoded tracks from a server. A storage unit(680) stores a fragment which constitutes the multimedia stream file. A reproduction unit(610) reproduces the multimedia stream file. A fragment access database(640) stores random access information in order to randomly access the fragment. A fragment access management unit(620) request the reception of the fragment and confirms the storage of the fragment through the fragment access database.
Abstract:
PURPOSE: A method and apparatus for providing a multimedia streaming service based on a fragment, and a method and apparatus for receiving a multimedia streaming service based on the fragment are provided to determine 3D construction information, left and right sequence information, or stereo-mono fragment change number information about the video of a current file. CONSTITUTION: Encoded data of a video including 2D video date or 3D video data is divided with a fragment unit(2310). Property information including 3D signaling information or relation information is determined at each fragment(2320). The property information about the divided video of the fragment and the fragments including the encoded video data are continuously transmitted(2330).
Abstract:
PURPOSE: A method for transceiving streaming data in a communication system with a server and a mobile communication terminal and the communication system therefor are provided to determine a bit rate in consideration of a communication environment between a server and a mobile communication terminal, thereby efficiently transceiving streaming data. CONSTITUTION: A server(30) converts multimedia data into streaming data using the prestored first bit rate. A mobile communication terminal(50) collects streaming parameters for determining the second bit rate if the streaming data is received. The mobile communication terminal informs the determined second bit rate to the server.
Abstract:
PURPOSE: A method performing communications based on a VoIP(Voice over Internet Protocol) by a bio key including bio-information of a user is provided to perform user authentication by generating a digital key including the bio-information of a user. CONSTITUTION: An encoding/decoding module(210) encodes signal from the external input device and decodes the signal received through communication. A bio-key generator(230) generates and manages the bio key by using bio-information. A session sharing key generator(250) uses bio key received from the far-end terminal An encryption authentication manages the production of recovery bio-key. A communication module uses the session shared key.
Abstract:
A method for variably controlling the bit rate of video data through the recognition of state of an end-to-end channel in a WiBro(Wireless Broadband) network is provided to control the transmission bit rate of a video codec properly according to the state of a WiBro channel when transmitting video data. When transmitting video data, the states of transmitting-side and receiving-side wireless channels are classified into a normal state and an abnormal state(200). According to the classified result, the encoding byte rate of the transmitting-side encoder is variably determined. The determined encoding byte rate is compared with a DL MCS(Down Link Modulation & Coding Selection) level which is a parameter of the receiving-side(234). According to the comparison result, the final encoding byte rate of the transmitting-side is variably determined(236).
Abstract:
A priority-differential non-uniform raptor coding method is provided to enable different objects to use independent parity codes by using a raptor code, which is included in a 3GPP(The 3 Generation Project Partnership) MBMS(Multimedia Broadcast and Multicast Service). An input symbol of the data to be encoded is received(1010). A priority of the data of the input symbol is checked(1020). Selection probabilities of respective symbols are set according to the priorities of the respective symbols, which are included in the input symbol(1030). The input symbol with the selection probabilities is encoded to generate an output symbol(1040). A packet is generated by using the output symbol(1050). An audio or voice stream has a higher priority than a video stream. An intra frame has a higher priority than a predictive frame. The predictive frame has a higher priority than a bi-directional frame. A header or a DC value in an intra frame has a higher priority than other data. The header and a motion vector value in the predictive frame have higher priorities than other data.
Abstract:
본 발명의 광선로가입자장치(ONU)들의 링크 상태를 관리하기 위한 기가비트 이더넷 기반의 수동 광가입자망은, 할당된 데이터 전송 구간을 이용하여 다음 윈도우 주기에 데이터신호의 전송을 위해 필요한 데이터 전송 대역 할당 요구신호가 포함된 리포트신호 및 데이터신호를 전송하는 적어도 하나의 ONU(Optical Network Unit), 일측이 ONU들과 각각 연결되고 타측이 적어도 하나의 광 통신 채널로 구성되면 입력되는 신호를 해당 목적지로 스위칭 전송하는 광분배기, 및 할당된 데이터 전송 구간에 리포트신호의 수신 여부 및 수신된 리포트신호를 전송한 ONU를 확인하고 리포트신호를 전송한 ONU로부터 할당된 데이터 전송 구간 동안에 데이터신호의 수신 여부를 확인하여 ONU들에 대한 링크 상태를 판단하고 관리하는 OLT(Optical Line Terminal)를 갖는다.