• Journal of IKEEE
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• v.22 no.1
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• pp.127-135
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• 2018

This paper was studied the tri-band folded monopole antenna design with Mu-negative metamaterial unit cell, which operates at 700 MHz UHD broadcast band and 2.45 GHz/5 GHz WiFi band. The MNR metamaterial is fabricated by forming a capacitor on the backside of the antenna substrate and connecting it to the ground plane through a strip line and a via hole so that a single cell can operate in the MZR (Mu zero resonator). Through this, the resonance point can be controlled to resonate in the zero mode in 700 MHz band, and the bandwidth is improved. Experimental results show that the 10dB bandwidth and gain are 309 MHz (41.2%) and 5.298 dB at the first resonance point, and the 10dB bandwidth and gain at the second resonance point are 821.9 MHz (33.5%) and 2.7840 dB respectively. At the third resonance point, the gain and bandwidth were 1.1314 GHz (20.6%) and 2.9484 dB respectively. We confirmed that the resonance point with theoretical value is in agreement with experimental value. And the radiation pattern is generally omnidirectional, and it has been confirmed that the radiation pattern is good in both forward and backward directions at 0.75 GHz and 2.45 GHz, and has a radiation pattern with multiple lobes at 5.5 GHz.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.121-122
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• 2017

미래창조과학부는 우리나라 최고의 ICT 제품과 서비스를 활용하여 평창동계올림픽을 성공적으로 지원하고, 향후 주요 경기개최국과 해외시장에 수출전략을 품목화하여 올림픽의 부가가치를 창출함으로써 돈버는 올림픽을 완성하겠다는 계획하에 5G, IoT, UHD, VR, AI 5개 분야에 대한 시범서비스를 준비하고 있다. 한국전자통신연구원은 UHD급 초고화질 영상과 100도 이상의 시야각을 이용하여 현장감을 극대화하는 UWV(Ultra Wide Vision) 기술을 개발하고 있으며, 평창동계올림픽 기간 동안 UWV 상영관을 운영하여 기존의 TV나 영화와 차별화된 몰입감을 제공하는 초실감 미디어 서비스를 제공하고자 한다. 또한 방송서비스로의 적용가능성을 타진하기 위한 주요 올림픽 경기실황중계 시범서비스를 추진하고 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.186-189
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• 2013

최근 다양한 3D 콘텐츠들에 대한 사용자의 요구에 따라 HD(High Definition)화질 및 이를 넘어서는 고해상도(FHD(full high definition), UHD(ultra high definition))의 고품질 3D 방송 서비스에 대한 연구가 진행되고 있으며, 차세대 영상 기술로 주목되고 있는 3차원 비디오 기술은 사용자에게 실감 있는 영상을 제공할 수 있다, 하지만 많은 시점을 전부 촬영하는 것은 한계가 있으므로, 카메라의 깊이 정보를 이용하여, 전송하는 시점을 줄이고, 시점영상을 합성함으로써 사용하는 카메라의 수보다 더 많은 시점을 생성하는 방법이 필요하다. 현재 국제 표준화 기구인 MPEG(Moving Picture Experts Group)의 3차원 비디오 부호화(3D Video Coding, 3DVC)에서는 깊이영상을 가지는 3차원 비디오영상에 대한 효과적인 부호화 기술들에 대해 표준화가 진행되고 있다. 이에 본 논문은 HEVC 기반의 3D-HEVC에서 사용하는 표준 기술들에 대하여 소개하고, 현재 사용되고 있는 기술들에 대한 성능 평가를 분석 하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.190-192
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• 2013

최근 HD(High Definition)화질 및 UHD(Ultra High Definition)화질과 같은 고품질 방송 서비스가 등장하고, 무선 네트워크 기술의 발달로 스마트폰, 태블릿PC 등과 같은 다양한 휴대용 멀티미디어 기기들이 존재함에 따라, 소비자들은 다양한 환경에서 고해상도 영상을 고품질로 사용하기를 원하고 있다. 따라서 스케일러빌러티의 현실적 필요성이 점점 대두되고 있으며, 이에 따라 ISO/IEC의 MPEG(Moving Picture Experts Group)와 ITU-T의 VCEG(Video Coding Experts Group)이 공동으로 결성한 Joint Collaborative Team on Video Coding(JCT-VC)에 의해 시간, 공간, 화질 등이 확장성을 제공하는 Scalable Video Coding(SVC)의 표준화가 진행되고 있다. 이에 본 논문은 공간적, 시간적, 화질적 스케일러빌러티(Scalability)를 제공하기 위한 SHVC의 표준 기술들에 대해 설명하고, 기존 단일 계층 부호화 방식(Single Video Coding)으로 서로 다른 해상도의영상을 Simulcast부호화한 결과와 비교하여 SHVC의 부호화한 결과와 비교하여 SHVC의 보호화 효율에 대한 성능을 분석 하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.65-67
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• 2021

국내 지상파 방송의 경우 2027년에 DTV를 종료하고 UHDTV로 완전 전환이 될 예정이다. 이러한 일정을 감안하면 기존 DTV 수상기를 보유한 가정에서는 UHDTV를 수신할 수 없어 TV를 시청할 수 없는 문제가 발생한다. 이를 위해서는 UHD 서비스를 DTV 서비스로 변환하여 제공할 수 있는 공시청 시스템 개발이 요구되는데, 본 논문은 이러한 공시청 시스템에서 UHDTV의 서비스 및 프로그램 정보를 DTV의 PSI/PSIP 정보로 변환하는 방법에 관한 것이다.

• Journal of Broadcast Engineering
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• v.17 no.5
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• pp.827-837
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• 2012

As broadcasting environments change rapidly to digital, user requirements for next-generation broadcasting service which surpass current HDTV service become bigger and bigger. The next-generation broadcasting service progress from 2D to 3D, from HD to UHD and from 5.1ch audio to more than 10ch audio for high quality realistic broadcasting service. In this paper, we propose 10.2ch based multichannel audio reproduction system for UHDTV. The 10.2ch-based audio reproduction system add two side loudspeakers to enhance the surround sound localization effect and add two height and one ceiling loudspeakers to enhance the elevation localization effect. To evaluate the proposed system, we used APM(Auditory Process Model) for objective localization test and conducted subjective localization test. As a result of objective/subjective localization test, the proposed system shows the statistically same performance compare with 22.2ch audio system and shows the significantly better performance compared with 5.1ch audio system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.11
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• pp.1364-1373
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• 2016

Ultra High Definition Television (UHDTV) has attracted much attention as one of next generation broadcasting services. For the commercialization of UHD broadcasting service, standardization groups including the DVB (Digital Video Broadcasting) and the ATSC (Advanced Television Systems Committee) have decided to adopt the Orthogonal Frequency Division Multiplexing (OFDM) for signal transmission. However, when the carrier frequency is not properly synchronized at the receiver, inter-symbol interference (ISI) and inter-carrier interference (ICI) may occur. In order to avoid performance degradation resulting from ISI or ICI, receivers should synchronize the carrier frequency by using preambles and pilot symbols. However, there only few published literature dealing with the frequency offset estimation methods regarding the next generation terrestrial broadcasting. In this respect, this paper proposes a method to estimate timing and fractional frequency offset for the ATSC 3.0 system by using a preamble bootstrap symbol. The proposed detector can detect the fractional frequency offset by adding a complex conjugate product on the conventional estimator where only timing offset can be estimated.

• Journal of Broadcast Engineering
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• v.19 no.5
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• pp.726-735
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• 2014

In accordance with 4K UHD(Ultra High Definition) LCD television's higher resolution and data expansion, LCD TV had to face problems such as increasing numbers of cables and tangible skews problems among cables. The V-by-One HS is a new interface technology in the path between the image processing IC and timing control (TCON) board. The variable speed from 600 Mbps to 3.75 Gbps effectively meets the requirements of various different pixel rates. In this paper, we use the V-by-One HS interface to illustrate our proposed simulation method of frequency resonance mode and PCB design approach to model the effects of signal integrity for high speed video signal using an IBIS models.

• Journal of Broadcast Engineering
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• v.22 no.4
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• pp.473-483
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• 2017

Since the advent of 3D and UHD contents, demand for high-quality panoramic images has been increasing. The UWV(Ultra-Wide Viewing) service uses a wider viewing angle than conventional panoramas to provide a lively experience for users and enhance their understanding of the event. In this paper, we propose a spatial adjacency map generation method and an UWV file storage format technology to provide UWV service. The spatial adjacency map measures the similarity between images and generate the position information of the images based on similarity. And the stitching time of the image can be shortened through the generated position information. Through the spatial adjacency map, we generate the large screen content quickly. The UWV file format which is based on ISOBMFF process spatial adjacency map and videos and support random access. In this paper, we design the UWV player to verify the spatial adjacency map and UWV file format and show the result of experiments.

• Journal of Broadcast Engineering
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• v.19 no.6
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• pp.836-846
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• 2014

To expedite UHD (Ultra High Definition) video service, the HEVC (High-Efficiency Video Coding) technology has recently been standardized and it achieves two times higher compression efficiency than the conventional H.264/AVC. To obtain the improved efficiency, however, it employs many complex methods which need complicated calculation, thereby resulting in a significantly increased computational complexity when compared to that of H.264/AVC. For example, to improve the coding efficiency of intra frame coding, up to 35 intra prediction modes are defined in HEVC, but this results in an increased encoding time than the H.264/AVC. In this paper, we propose a fast intra prediction mode decision scheme which reduces computational complexity by changing the number of intra prediction mode in accordance with the percentage of PU sizes for a given video resolution, and by classifying the 35 intra prediction modes into 4 categories considering video resolution and quantization parameter. The experimental results show that the total encoding time is reduced by about 7% on average at the cost of only 2% increase in BD-rate.