Abstract:
PURPOSE: A network-based remote forensic system is provided to easily use evidence data with the accumulation of collected evidence data. CONSTITUTION: One or more remote terminals(240) interlink an evidence device(110) in a remote place. The remote terminal performs forensic for the evidence device with a virtual forensic tool. An investigation center system(200) is connected through a wide area network to the remote terminal. The investigation center system offers the virtual forensic tool. The investigation center system processes the requirement of the remote terminal.
Abstract:
PURPOSE: A signal interference removing apparatus and method thereof are provided to improve the reception performance of an AT-DMB(Advanced Terrestrial Digital Multimedia Broadcasting) receiver in a single frequency network system. CONSTITUTION: An interference cancellation unit presumes the channel distortion of an output signal of an OFDM(Orthogonal Frequency Division Multiplexing) demodulating unit(S505). The interference cancellation unit generates the channel distortion of a frequency domain(S506). The interference cancellation unit measures the time delay of a T-DMB(Terrestrial-Digital Multimedia Broadcasting) signal(S508). The interference cancellation unit selects the T-DMB signal(S509). The interference cancellation unit generates an interferential signal(S510).
Abstract:
PURPOSE: A signal transceiving method for sync detection is provided to detect an AT-DMB signal by using a signal for frame sync detection in a receiving signal including a T-DMB signal and a AT-DMB signal. CONSTITUTION: A signal transmission device for frame sync detection receives an HP(High Priority) signal and a LP(Low Priority) signl(S501). The device perform an IFFT(Inverse Fast Fourier Transform) of a layer modulation signal(S502). The device detects a PRS(Phase Reference Symbol) signal of a converted time domain signal(S503). The device divides the time interval corresponding to the PRS signal into a plurality of sections(S504). The device transmits a receives of an AT_DMB as a frame sync detection signal(S506).
Abstract:
PURPOSE: A method and a device for detecting a modulation mode in a terrestrial digital multimedia broadcasting system to which hierarchical modulation is applied are provided to effectively detect a modulation mode applied to a newly added signal in a receiving end. CONSTITUTION: A PRS(Pseudo Random Sequence) signal detecting module(210) detects a signal interval to which hierarchical modulation is not applied from a received broadcast signal. A PN(Pseudo-random Number) sequence detecting module comprises a PN sequence providing module(410) and a cross correlation module(420). The PN sequence detecting module performs cross correlation between the detected signal interval and a preset sequence. A mode determining unit detects a modulation mode using a result value of the cross correlation.
Abstract:
본 발명은 지역방송서비스를 제공하는 방법 및 그 장치에 관한 것이다. 지역 방송 시스템에서 지역 방송 서비스를 제공하는 장치는 지상파 디지털 멀티미디어 방송 시스템으로부터 제1 주 방송신호를 수신하고, 수신된 제1 주 방송신호를 지역 방송을 위한 제2 주 방송신호로 변환한다. 또한, 지역 방송 서비스를 제공하는 장치는 방송하고자 하는 제1 지역방송신호를 부호화하여 제2 지역방송신호를 생성하여, 제2 주 방송신호와 상기 제2 지역방송신호를 계층 변조하여 전송한다. 이로써 지역 방송 서비스를 제공하는 장치는 지상파 디지털 멀티미디어 방송과의 호환성을 제공하면서 특정 지역에서 지역방송 서비스 제공하여 사용자에게 편의를 제공할 수 있다. T-DMB, AT-DMB, 지역방송서비스
Abstract:
계층 복조 장치는 미리 알고 있는 심볼을 바탕으로 기준 심볼을 채널 추정하여 기준 심볼의 채널 추정 값을 생성하고, 기준 심볼의 채널 추정 값을 바탕으로 복수의 정보 심볼을 채널 추정하여 복수의 정보 심볼의 채널 추정 값을 생성하며, 복수의 정보 심볼의 채널 추정 값을 바탕으로 복수의 서비스 심볼을 채널 추정하여 복수의 서비스 심볼의 채널 추정 값을 생성한다. 그리고 기준 심볼의 채널 추정 값, 복수의 정보 심볼의 채널 추정 값, 및 복수의 서비스 심볼의 채널 추정 값을 바탕으로 신호를 채널 등화한 후 채널 등화된 신호를 계층 분리하여 제1 계층 변조 신호와 제2 계층 변조 신호를 생성한다. 이를 통해 기존의 시스템과 호환성을 유지하면서 기본 계층에는 영향을 주지 않고 추가 계층의 수신 성능을 향상시킬 수 있다. OFDM, 파일럿, 복조, 채널 추정
Abstract:
An Internet voting system for providing a mutual attestation function to each participant in a trusted computing environment by using a TMP is provided to make each participant trust and use the Internet voting system on a trusted platform by adding the mutual attestation function. An authentication server performs authentication. A voter terminal(100) performs the authentication with the authentication server by using TPM and performs voting after the mutual attestation between a voting server(200) and a ballot counting server(300). The voting server stores voting information received from the voter terminal. The ballot counting server performs the authentication with the authentication server by using the TPM and performing the mutual attestation with the voter terminal, and provides a voting ticket for inputting the voting information to the voter terminal during the voting, and announces a voting result by analyzing the voting information stored through the voting server during ballot counting.
Abstract:
An apparatus and a method for providing a high quality multimedia service in a digital multimedia broadcast transmission system are provided to supply reverse-compatibility with regard to an existing receiving device while providing a function for high quality in a digital multimedia broadcast. An encoding unit separaes and encodes input multimedia contents into a basic layer base stream and an enhancement layer base stream. The SL packet conversion unit(1250) respectively converts the base layer and enhancement layer base stream into an SL packet. A PES packet conversion unit(1240) converts the converted SL packet into a PES packet. A TS multiplexer multiplexes the PES packet per a basic layer base stream and an enhancement layer base stream to output it by a TS packet.