Abstract:
본 발명은 등화기능을 구비한 터널용 지상파 디엠비 재난 방송 장치 및 방법에 관한 것으로서, 본 발명에 따른 지상파 디엠비 재난 방송 장치는 수신 안테나로 수신되는 다중 경로 신호나 도심 속 차량에 의한 도플러 효과를 제거하여 고품질의 지상파 디엠비 신호를 중계하고, 긴급 상황 발생시 지상파 디엠비 신호를 중계하던 채널에서 주파수 변경 없이 긴급 방송 서비스를 제공할 수 있는 것을 특징으로 한다. 등화기, 지상파 디엠비, 다중경로
Abstract:
본 발명은, 디지털 방송을 위한 전송 시스템에서 전송 프레임의 앞부분에 프레임 헤더 정보를 추가하여 시간적으로 서로 다른 전송 프레임에 서로 다른 전송모드, 변조 레벨, 계층 변조, 에러 정정 부호 등을 정할 수 있는 디지털 방송 신호의 전송 방법, 전송 장치, 수신 방법, 수신 장치 및 이의 전송 프레임 구조에 관한 것이다. 전송 프레임 구조는, 전송 프레임의 다중화 정보를 포함하는 프레임 헤더; 및 상기 전송 프레임이 제공하는 서비스에 대한 데이터 정보를 포함하는 프레임 바디를 포함한다. 또한, 상기 프레임 헤더는, 상기 전송 프레임의 시작 위치를 추출하기 위한 동기 신호 정보를 포함하는 프레임 동기신호부; 및 상기 전송 프레임이 포함하고 있는 데이터의 다중화 정보―상기 전송 프레임이 포함하고 있는 데이터의 전송 모드, 변조 레벨, 계층 변조, 에러 정정 부호의 정보―를 포함하는 프레임 정보부를 포함할 수 있다. 디지털 방송, 전송 프레임, 전송 모드
Abstract:
PURPOSE: A disaster broadcast providing apparatus and a method thereof are provided to provide a disaster broadcast service only in an area where a disaster situation is generated. CONSTITUTION: A control unit of a monitoring unit relays a digital multimedia broadcasting (DMB) signal to a broadcast receiver which is in a signal reaching range. The control unit receives one or more data which are measured in a sensor which is installed in a specific location. The disaster situation determining unit of the monitoring unit determines a disaster situation based on the one or more data. A wake-up generating unit generates a disaster broadcast signal and a wake-up signal in order to wake up the broadcast receiver which is in a broadcast termination mode when a disaster situation is generated (S612). A wake-up synthesizing unit transmits the disaster broadcast signal and the wake-up signal by disconnecting the relay of the DMB broadcast signal (S614). [Reference numerals] (AA) No; (BB) Yes; (S600) Receive a signal that a disaster occurs; (S602) Receive a service stream for the situation of the disaster; (S604) Encoding and multiplexing; (S606) Generate a disaster broadcast signal; (S608) Transmit the disaster broadcast signal; (S610) Receive a wake-up request signal?; (S612) Generate a wake-up signal; (S614) Synthesize and transmit the wake-up signal; (S616) Transmit the synthesized signal
Abstract:
PURPOSE: A transmission method, transmission apparatus, reception method, and reception apparatus for a digital broadcasting signal are provided to divide a stream into multiple layers according to the properties of the stream and independently process the layers. CONSTITUTION: A transmission method for a digital broadcasting signal comprises steps of: dividing a unit stream into multiple layers according to the properties of the stream (S104); encoding and mapping the divided layers (S105, S106); and dynamically assigning the resources of the layers based on the number of symbols of the layers (S107, S108). [Reference numerals] (AA) Start; (BB) End; (S101) Input multiple transmission streams; (S102) Multiplex in the type of a unit stream; (S103) Encode for error correction; (S104) Divide the unit stream into multiple layers; (S105) Encode the divided layers; (S106) Map the divided layers using a predetermined method; (S107) Determine the bandwidth of each layer based on the number of symbol of each layer; (S108) Assign frequency domain; (S109) Perform frequency interleaving to each layer; (S110) Perform inverse fast Fourier transform
Abstract:
PURPOSE: A broadcast signal receiving method and a device thereof are provided to supply separate transmission types according to a frequency domain and a time domain. CONSTITUTION: An A/D converting unit(510) receives a transmission frame. The A/D converting unit converts the received transmission frame into a distal signal. The transmission frame includes a plurality of transmission data. The transmission frame includes a frame header including information about the transmission data. A frame header determining unit(520) decodes frame header information from the transmission frame. A transmission data selecting unit outputs one of the transmission data based on the frame header information. [Reference numerals] (510) A/D converting unit; (520) Frame header determining unit; (530) Fourier converting unit; (540) Service selecting unit; (AA) Transmitting signal; (BB) Digital demodulation unit 1; (CC) Digital demodulation unit 2; (DD) Digital demodulation unit 3; (EE) Channel decoding unit 1; (FF) Channel decoding unit 2; (GG) Channel decoding unit 3; (HH) Service 1; (II) Service 2; (JJ) Service 3
Abstract:
PURPOSE: A data signal transmitting method and an apparatus thereof using a multiple antenna are provided to increase transmission efficiency of main data and to increase transmission speed of sub data in a diversity technique. CONSTITUTION: A transmission system obtains a main data signal and a sub data signal(S1010). The transmission system encodes and modulates the main data signal and the sub data signal(S1020). The transmission system performs diversity coding of the main data signal and the sub data signal(S1030). The transmission system synthesizes the main data signal and the sub data signal(S1040).