• Journal of Broadcast Engineering
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• v.5 no.2
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• pp.140-158
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• 2000

Testing of terrestrial Digital TV(DTV) broadcasting in Seoul and Kyung-gi region was started in May 1999. Tasks of the committee for DTV technical evaluation were to implement test procedures for DTV transmitting systems, to analyze various technical aspects of DTV and to complete a field test. This paper summarizes the field test results. The field test vehicle was designed and constructed to measure field data. We chose over 200 test points to verify the receiving status of DTV signals and compared them with the analog TV signals at the same site. The results showed stable and satisfactory reception of DTV signals over 70%. The system performance index was over 80%.

• Journal of Broadcast Engineering
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• v.8 no.2
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• pp.109-115
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• 2003

In this paper we propose an efficient method to broadcast digital television signals using Single Frequency Networks (SFNs) in the Advanced Television Systems Committee (ATSC) transmission systems. Since the proposed schemes to synchronize multiple transmitters minimize the changes from the conventional ATSC system, the hardware complexity for the changes is very low. Our simulation results show that the proposed scheme makes less than 0.1 dB degradation at the threshold of visibility (TOV： BER= 3$\times$$10^{-6}$) in the additive white Gaussian noise (AWGN) channel. It is possible to reduce the performance degradation by increasing an initialization period of the proposed scheme.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.05a
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• pp.114-118
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• 2007

The space for production, such as studios and control rooms, is a space for TV program production, which is the main function of broadcast. A block planning for such space should be carefully designed, because it can significantly affect the efficiency of production, as well as future productivity and the development and expandability of production. From the results of comparative analysis of 7 local terrestrial broadcasters built since the late 1990s, this study will. propose an ideal block planning for the future construction of local terrestrial broadcasters. Also, the results can be used a basic data when constructing new buildings for local broadcasters.

• 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.

• Journal of Advanced Navigation Technology
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• v.15 no.1
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• pp.61-68
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• 2011

DVB-T2 system developed by DVB project is the next generation digital terrestrial television broadcasting standard designed for offering HDTV service in a post-Analog Switch Off (AOS) environment. In this paper, the performance of DVB-T2 is evaluated with the help of computer simulation. The bits error rate(BER) performance is studied in both AWGN, Rayleigh, Ricean and 0db-echo channel. Firstly, we will give a brief introduction to DVB-T2 system and then compare its BER performance to that of Implementation Guideline.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2004.11a
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• pp.21-25
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• 2004

최근 IT를 포함한 모든 산업 및 기술 영역에서는 포준화 활동을 기반으로 하여 융복합화(Convergence) 현상이 두드러지고 있다. 이는 또한 e-Learning 산업 및 기술에서도 큰 화두이다. 현재 e-Learning 표준화에서 시장에서 주도권을 행사하고 있는 것은 ADL의 SCORM 규격이다. 데이터방송 영역에서는, 북미에서 지상파와 케이블 TV간 콘텐츠 호환성 확보를 위해 ATSC와 케이블랩(CableLabs)이 공동 연구 중인 ACAP을 통해서 지상파-케이블 공통 표준화가 진행중이다. 이에 본 논문은 3-Learning 산업 및 기술에서의 융복합화의 일 영역으로 그리고 방송통신융합서비스의 일환으로 인터넷 기반 학습 환경과 TV 기반 학습 환경에서의 학습 콘텐츠 ( 및 코스웨어) 상호운용성에 대해 연구하였다. 이를 위하여 인터넷 기반의 e-Learning의 사실상의 표준으로 받아들여지고 있는 SCORM 규격과 DTV 환경 기반의 데이터방송 지상파-케이블 공통 규격인 ACAP간의 상호운용 API 개발을 통하여, SCORM 규격과 ACAP 규격의 상호운용성을 가능하게 하는 학습 콘텐츠 및 T-Learning 운용환경을 연구$\cdot$개발하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7A
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• pp.529-536
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• 2003

In this Paper, a new DCT HLMS DFE(Discrete Cosine Transform Hierarchical Least Mean Square Decision Feedback Equalizer) algorithm is proposed to improve the convergence speed and MSE(Mean Square Error) performance of a receive channel equalizer in ATSC(Advanced Television System Committee) 8VSB(Vestigial Side Band) digital terrestrial TV system. The proposed algorithm reduces the eigenvalue range of input data autocorrelation by transforming LMS (Least Mean Square) DFE into the subfilter of hierarchical structure. Moreover, the use of DCT and power estimation algorithm makes it possible to reduce the eigenvalue deviation of input data which results from distortion and delay of the receive signal in the miulti-path environment. Simulation results show that proposed DCT HLMS DFE has SNR improvement of approximately 3.8dB, 5dB and 2dB as compared to LMS DFE when the equalized symbol error rate is 0.2 in ATTC defined digital terrestrial TV broadcasting channels A, B and F, respectively.

• Digital Contents
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• no.11 s.126
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• pp.32-37
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• 2003

꿈의 디지털 방송시대가 성큼 다가오고 있다. 지상파 디지털 방송은 이미 본방송에 들어 갔으며 차세대 뉴 미디어 산업의 초아로 각광 받고 있는 디지털멀티미디어 방송(DMB)도 내년째 첫 선을 보일 예정이다. 그러나 뒤 늦게 전송방식, 압축방식 등 디지털 방송을 둘러싼 기술 논쟁이 과열돼 소비자들이 혼란을 격고 있다. 지상파 디지털 방송은 유럽식, 미국식 전송방식을, DMB는 멀티미디어 압축 방식에 대한 효율성을 놓고 논쟁을 그치지 않고 있다. 디지털 TV를 접한지 얼마되지 않아 DMB라는 새로운 매체를 접하게 되는 소비자들에게 모든 것이 생소할 따름이다.

• The Journal of the Korea Contents Association
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• v.19 no.4
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• pp.150-161
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• 2019

This study analyzed the impact of social trust and conflict perception of news users on news use. To this end, 548 adults aged 20 and under 69 were surveyed online. The analysis results are as follows. First, the level of awareness of social conflict has been shown according to people's political orientation. Second, the higher the trust in society, the greater the use of news regardless of land-based, comprehensive, and online channels. Third, the perception of social conflict was related to the use of news through JTBC, TV Chosun, Channel A and YouTube. Fourth, the age and political orientation of news users influenced the use of news by channel. Finally, the more progressive the tendency was to use news through JTBC or to watch news on portals. On the other hand, the more progressive the use of news through three terrestrial broadcasters, TV Chosun, and Channel A decreased. In conclusion, this study is meaningful in terms of the user-oriented discussion of the news environment and the impact of an individual's social perception on news use.

• Journal of IKEEE
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• v.16 no.1
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• pp.7-14
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• 2012

In this paper, a reception rate of terrestrial digital TV broadcasting service is analyzed and a novel method which can estimate the broadcasting coverage rate more objectively and reliably than the existing method is proposed. Previous method measures the reception rate by means of electric field intensity measurement or subjective video quality assessment. Because of limited measuring points, it inherently has measurement error and cannot consider the viewer's receiving conditions in real-time. In order to consider the viewer's population and receiving environment, morphology which characterizes the viewer's receiving environment is extracted using household census data of National Statistical Office and the land cover map of Ministry of Environment. Using the extracted geographical morphology, the reception rate of terrestrial digital TV broadcasting service is calculated with Spectrum Management Intelligence System (SMIs). Proposed method can calculate the reception rate more objectively and reliably than the existing methods because it fully considers the viewer's receiving environments in real-time.