• Broadcasting and Media Magazine
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• v.4 no.4
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• pp.25-28
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• 1999

• Broadcasting and Media Magazine
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• v.7 no.1
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• pp.30-38
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• 2002

• Broadcasting and Media Magazine
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• v.7 no.1
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• pp.81-93
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• 2002

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.05a
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• pp.307-326
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• 2002

• Journal of Broadcast Engineering
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• v.12 no.2
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• pp.120-127
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• 2007

In this paper, we describe a new 1/4 rate robust modulation techniques for Enhanced-x VSB system which is fully backward compatible with ATSC 8-VSB standard. 1/4 rate mode Enhanced-xVSB system provides broadcasters with a wide choice of trade-offs of data rate vs amount of robustness of enhanced data for pedestrian/mobile services. Lab test results of proposed Enhanced-x VSB 1/4 rate mode robust stream are a significantly improved multipath as well as AWGN reception performance for Enhanced-x VSB receiver. We suggest an Enhanced-x VSB terrestrial broadcasting system for ATSC HDTV and pedestrian/portable TV simultaneous broadcasting service providing.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.327-335
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• 2001

In the 21st century, broadcasting, communication, and computer have been integrated due to the development of digital technology. Accordingly, to overcome the limit of respective communication media and to maintain them, their independent area shall not be classified. This study is to examine the future environment of digital TV broadcasting, to analyze customizing type service and interactive type TV technology, and to make asymmetric interactive digital TV publication broadcasting system, which is TV broadcasting in the next generation to treat visual image, sound, and various data all together by harmonizing broadcasting and communication like ISDB(Integrate Service Digital Broadcasting). In addition, to develop service on publication broadcasting with high quality, this study is to propose to develop relative devices for TV/PC reception to realize a new communication type TV publication broadcasting, by analyzing technology for producing, sending, transmitting, receiving, and saving to apply to customizing type interactive system and by examining its application.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.662-676
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• 2008

This paper presents a video copy detection algorithm that blocks online transfer of illegally copied DTV broadcast programs. Particularly, the proposed algorithm establishes a set of keyframes by detecting abrupt changes of luminance, and then exploits the spatio-temporal features of keyframes. Comparing with the preregistered features stored in the database of DTV broadcast programs, the proposed scheme performs a function of video filtering in order to distinguish whether an uploaded video is illegally copied or not. Note that we analyze only a set of keyframes instead of an entire video frame. Thus, it is highly efficient to identify illegal copied video when we deal with a vast size of broadcast programs. Also, we confirm that the proposed technique is robust to a variety of video edit-effects that are often applied by online video redistribution, such as apsect-ratio change, logo insertion, caption insertion, visual quality degradation, and resolution change (downscaling). In addition, we perform a benchmark test in which the proposed scheme outperforms previous techniques.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.36-39
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• 2010

본 논문에서는 DTV 방송 전환에 따른 주파수 이전 및 채널 재배치 시, 시스템 및 전파환경의 변화에 따라 수신 한계전계강도도출과 동등한 수준의 서비스 제공에 대한 기술적 분석 방법론을 제시한다. 전판환경 분석을 위한 전계강도 예측 모델은 ITU-R 권고 P.1546을 적용하였으며, 이를 기반으로 ATV 및 DTV의 수신한계전계강도 대한 수식을 정립하였다. 선정된 수신기의 특성에 대해 수치해석 및 결과를 고찰하였으며, 설정한 시스템에 대해 동등한 수준의 서비스 제공을 위한 시스템의 변수 보정도 방법도 제시하였다.

• Broadcasting and Media Magazine
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• v.5 no.4
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• pp.56-66
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• 2000

정보통신 기술의 발전으로 사회전반이 디지털 시대로 급격히 이행되고 있으며, 이에 따라 방송 개념도 특정계층 대상의 전문채널, 개별적인 요구에 부응하는 개별채널, 양방향 전송로의 확보로 대화형 채널 등으로 확장되고 있다. 또한 방송제작 개념도 멀티미디어 제작 시스템을 근간으로 영상검색 및 합성, 스크립터 편집, 가상현실 이용 등 고도의 제작기법을 활용함으로써 사용자 친화성, 다이나믹한 표현, 실시간, 대화성을 특징으로 변화되고 있다. 이에 따라 곧 전세계적으로 HDTV, 3DTV, UDTV 및 실감 TV 등 고품질 방송서비스가 등장할 것이다. 따라서 본 고에서는 2010년경에 방송예정인 3DTV의 활성화에 도모하고자 자연스런 입체영상을 구현하기 위한 3차원 TV의 구현요소, 3차원 TV의 동향, 3차원 디스플레이 방식 및 3DTV의 전망 등을 살펴본다.

• Journal of Broadcast Engineering
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• v.7 no.3
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• pp.271-276
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• 2002

It is very important to find errors in broadcasted streams because it can help us to find where errors occur. Broadcasted streams may have errors in the RF(radio frequency) or baseband domain. It is very important to fix these errors because it can help to stabilize set-top boxes, provide stable receiving, and give comfortable environments to watch TV. Since 2001, major terrestrial broadcasters in Korea started the DTV broadcasting in Kwan-Ak over Seoul area. In this paper, we provide some analysis on errors in MPEG-based TS streams, PSIP packets, and RF area which may occur in DTV systems and compare this result with that of USA.