• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.10
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• pp.2345-2350
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• 2014

In this paper, measurement methods for the characteristics of antennas for indoor digital TV (DTV), having 75-ohm port impedance, are introduced. Reference impedance of typical radio frequency (or microwave) systems and measurement equipments is 50 ohm. However, the reference impedance of antennas for indoor DTV is 75 ohm, and the characteristics of the antennas cannot be measured directly using the measurement equipments. Measurement methods, using test equipments with reference impedance of 50 ohm, for the characteristics(impedance, radiation patterns, and gain) of antennas designed to fit for 75 ohm port are introduced.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.4B
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• pp.613-623
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• 2000

Digital TV tuner for 8-VSB modulation was developed with satisfying the requirements of ATSC. The double frequency conversion and the active tracking filter in the front-end were used to reduce interference of the adjacent channels and multi-channels, which suppress If beat and image band. However, it was impossible to get frequency mapping between tracking filter and first VCO(Voltage Controlled Oscillator) in the double conversion digital TV tuner differing from conventional NTSC tuner. This paper, therefore, suggests the available structure and a new method for automatic frequency selection by obtaining the mapping of frequency characteristic over tracking voltage and the combined hardware which compose of Micro-controller, EEPROM, D/A(Digital-to-Analog Converter), OP amp and switch driver to solve above problems.

• Convergence Security Journal
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• v.11 no.4
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• pp.51-58
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• 2011

Due to the digital technology, the TV broadcasting platform is evolving to the digital-TV, which is supporting data broadcasting service. Although the data broadcasting services (i.e., games, wether information, stock trading service) provide rich entertainment to viewers, they make the operation manners of digital-TV so complex that some viewers feel difficulty in using their TV sets. Several researches have been performed to address the problem by improving the functions of EPG such as searching and reserving programs, applying gesture and voice recognition technologies to operating EPG, guiding the design of the EPG's user interface, and developing agents helping EPG to behave intelligently. A research, however, that tries to address the problem that viewers have different familiarities with IT services has not been performed yet. The paper tackles the problem by letting a viewer to choose an EPG configuration (among the several EPG configurations provided by a broadcasting network) and designing an EPG that implements an EPG configuration based on the choice.

• Journal of Digital Convergence
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• v.6 no.4
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• pp.63-71
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• 2008

This study researches the effectiveness of interactive TV advertising focusing on the factors of audience involvement and interaction. The study began with the effective measurement of interactive television advertisements. Interactive television advertisements have different concepts than existing television advertisements. This study mainly focuses on the characteristics of audience interaction and experiments based on the data of 78 persons for measurement. In the experiments, the characteristics were categorized according to search time, specifically the number of searched pages about interactive television advertisement. Hypothesis 1 reveals that the interaction of the audience increases when the advertising attitude, brand attitude, and purchase intentions also increase. Hypothesis 2 finds that the involvement of the audience increases when the advertising attitude, brand attitude, and purchase intentions also increase. By studying these consumer characteristics and behavior, a new method of effective measurement for interactive television advertisement is uncovered. The new method includes not only existing measurement elements of television advertisement which include attitude about advertising and brand, and customer purpose, but also the features of interactive television advertisement like customer search time. According to this research on interactive television advertisement, the interaction with and involvement of the audience are highly influential variables.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.635-638
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• 2000

멀티미디어 기술의 총아라고 불리는 차세대 디지털 방송은 현재 선진 각 국에서 표준안 제정에 심혈을 기울이고 있으며 그 핵심적인 기술은 대부분 MPEG-2를 근간으로 하고 있는 실정으로 현재는 양방향 서비스에 대한 논의가 제한적으로 이루어지고 있다. 이에 차세대 영상압축 기술인 MPEG-4에서는 시스템 차원에서 사용자와의 상호작용을 지원할 수 있는 구조로 개발되어 있다. 본 논문에서는 이러한 기술적 차이에 착안해서 현재 제정된 디지털 방송 표준안을 기본으로 하고 사용자와의 상호작용을 지원하는 부가 데이터 방송은 MPEG-4 시스템 표준을 이용하여 양방향성이 강조된 디지털 방송 시스템 모델을 제안한다. 제안된 기술은 별도의 하드웨어의 지원 없이 소프트웨어만으로 처리할 수 있으며 차후 하드웨어로 제작될 디지털 TV 수신기모델을 손쉽게 검증, 제시함으로써 셋톱박스 및 디지털 TV 개발에 응용할 수 있다.

• Journal of Korea Multimedia Society
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• v.8 no.3
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• pp.362-371
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• 2005

This paper presents a digital video broadcasting - terrestrial (DVB-T) receiver system based on the orthogonal frequency division multiplexing (OFDM) modulation method, which has exhibited a good reception performance even with obstacles and a mobile reception. As such, an improved OFDM receiver is developed for a DVB-T system that also considers function expansion for further development. After manufacturing the DVB-T receiver system, the performance of the proposed system is compared with three other hardware systems, all of which are end products. The experimental results confirm the performance using the measured minimum required carrier-to-noise ratio and threshold of visibility signal for each system. In addition, a graphic user interface (GUI) and electronic program guide (EPG) are developed for the digital television user.

• Journal of Digital Contents Society
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• v.13 no.4
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• pp.539-545
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• 2012

As a representative of the convergence of broadcasting and communication, the data service provide viewers new services such as games, weather services, and stock trading services on TV. The data service, however, has failed to gain the popularity with the viewers due to the short of killer services and the dominating power of TV programs. The paper introduces an MHP-based method for semantically integrate a data service to a TV program by allowing the data service to utilize the content of the TV program, which changes as time goes on.

• The Journal of the Korea Contents Association
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• v.7 no.3
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• pp.87-92
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• 2007

This paper describes the personal video recorder-based approach to realise enhanced services for interactive programmes on digital television. So far it is very difficult that most of interactive programmes included the vast quantities of contents, whatsoever it is data-broadcasting or HD-ready, are broadcasted on digital television via the current set-top box. Furthermore it was not possible to envisage until IPTV has been appeared. Even though IPTV makes possible for streaming the interactive services via high-speed broadband, it is not easy to receive the tremendous contents with interactivity through the current set-top box in a single effort. In this paper it suggests the effective solution to resolve the download dilemma for providing the interactive services on digital television by employing the set-top box fitted with the personal video recorder.

• Journal of Satellite, Information and Communications
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• v.10 no.4
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• pp.141-145
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• 2015

The dynamic range of the loudness after digitalization of television broadcasting is enlarged, and the loudness difference between the broadcast channel and between the programs within the same channel is expanded. This was subjected to interfere with the television viewer's comfort. In order to improve these problems international standards for the loudness normalization was established in ITU, Europe, USA and Japan. This regulation was introduced to Korea also as technical regulation, and this will apply the broadcast service in June 2016. In this paper, ahead of the introduction of digital television technology based on loudness measurement for the major television channel and to present the results of the comparison of technical standard.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.11a
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• pp.291-294
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• 2002

본 논문에서는 디지털 TV 데이터 방송에 있어 핫스팟 기능을 지원하기 위한 비트스트림 제작에 관하여 서술한다. 디지털 TV 데이터 방송에 있어 핫스팟이란 시청자의 선택에 의해 더 많은 정보를 제공할 수 있는 "클릭 가능한 비디오 객체"를 의미한다. 이 기능은 다른 용도로도 사용될 수 있으나, 특히 TV 전자상거래(T-commerce)에 유용하게 사용할 수 있다. 이러한 기능을 제공하기 위해서는 핫스팟 기능을 처리할 자바 응용프로그램, 즉 엑슬릿(Xlet)과 화면상에서 핫스팟의 시공간적 위치를 지정하는 핫스팟 데이터, 그리고 핫스팟과 주 프로그램화면 간의 동기화를 위한 시간 기준 등이 송출되는 비트스트림 내에서 제공되어야 한다. 본 논문에서는 핫스팟 적용 시나리오를 설명하고 이 시나리오에 따라 핫스팟 기능을 제공할 수 있는 비트스트림을 제작하였다. 보다 더 구체적으로는, 엑슬릿을 ISO/IEC 13818-6 DSM-CC 확장 표준의 오브젝트 캐루젤로, 그리고 핫스팟 데이터를 MPEG-2 프라이벳 섹션(Private section)으로 구성하여 비트스트림에 포함시켰다. 또한, 시간 기준을 위해 DSM-CC 확장 표준에서 규정하고 있는 정규 재생시간(normal play time, NPT) 클록을 이용하여 시간 참조 값을 생성하였으며, 트리거(trigger)를 보내기 위한 이벤트들도 동일 표준에서 규정하고 있는 이벤트 서술자에 따라 생성하여 비트스트림 내에 포함시켰다. 내에 포함시켰다.