• Broadcasting and Media Magazine
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• v.1 no.1
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• pp.61-74
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• 1996

디지탈 오디오 방송(DAB)과 디지털 텔레비전(DTV), 고선명 텔레비전(HDTV) 방송의 실용화가 다가오면서 대용량의 디지털 오디오 신호를 주관적인 왜곡없이 압축, 복원할 수 있는 고음질 오디오 부호화 방식이 방송음향 기술전반에 응용되고 있다[1][2]. 또한 방송 채널에 있어서도 기존의 스테레오에서 다채널 오디오 시스템으로 진전하면서 가상 현실, 입체음향 등에 필수적인 음장재생 기술이 적용되고 있다[3][4]. 위와 같은 기술은 디지털 오디오 신호처리 기술의 발전이 가져온 결과로 미래의 방송기술을 변화시키고 있다. 본 고에서는 디지털 방송 시스템에 있어서 디지털 신호처리 기술의 응용 분야를 살펴보고 새로운 기술을 소개하기로 한다.

• ETRI Journal
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• v.34 no.6
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• pp.911-921
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• 2012

In high-speed wireless communications, an analysis of the propagation characteristics is an important process. Information on the propagation characteristics suitable for each environment significantly helps in the design of mobile communications. This paper presents the analysis results of radio propagation characteristics in outdoor environments for a new mobile wireless system at 781 MHz. To avoid the interference of Korean DTV broadcasting, we measure the channel characteristics in urban, suburban, and rural areas on Jeju Island, Republic of Korea, using a channel sounder and $4{\times}4$ antenna. The path loss (PL) measurement results differ from those of existing propagation models by more than 10 dB. To analyze the frequency characteristics for Korean propagation environments, we derive various propagation characteristic parameters: PL, delay spread, angular spread, and K-factor. Finally, we verify the validity of the measurement results by comparing them with the actual measurement results and 3D ray-tracing simulation results.

• Journal of Broadcast Engineering
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• v.17 no.4
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• pp.640-658
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• 2012

One of the existing terrestrial multi-channel DTV service frameworks, called KoreaView, provides four programs, composed of MPEG-2 based one HD video and H.264/AVC based three SD videos within one single 6MHz frequency bandwidth. However the additional 3 SD videos can not provide enough quality due to its reduced spatial resolution and low target bitrates. In this paper, we propose a framework, which is called a terrestrial multi-channel high quality hybrid DTV service, to overcome such a weakness of KoreaView services. In the proposed framework, the three additional SD videos are encoded based on an H.264/SVC Spatial Base layer, which is compliant with H.264/AVC, and are delivered via broadcasting networks. On the other hand, and the corresponding three additional HD videos are encoded based on an H.264/SVC Spatial Enhancement layer, which are transmitted over broadband networks such as Internet, thus allowing the three additional videos for users with better quality of experience. In order to verify the effectiveness of the proposed framework, various experimental results are provided for real video contents being used for DTV services. First, the experimental results show that, when the SD sequences are encoded by the H.264/SVC Spatial Base layer at a target bitrate of 1.5Mbps, the resulting PSNR values are ranged from 34.5dB to 42.9dB, which is a sufficient level of service quality. Also it is noted that 690kbps-8,200kbps are needed for the HD test sequences when they are encoded in the H.264/SVC Spatial Enhancement layer at similar PSNR values for the same HD sequences encoded by MPEG-2 at a target bitrate of 12 Mbps.

• Broadcasting and Media Magazine
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• v.8 no.3
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• pp.30-39
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• 2003

디지털 경제에서는 세계표준을 따르는 것이 선택이 아니라, 필수적인 것이다. 따라서 디지털 방송표준또한 필연적으로 준수되어져야 하는 규격인 것이다. 최근 방송환경이 매체별(지상파, 위성, 케이블)로 디지털방송으로 전환 중이거나 전환을 완료하여 서비스중에있다. 데이터방송 또한 매체별로 실험서비스 혹은 본방송이 진행중이다. 데이터방송은 디지털 방송에 양방향 서비스를 가늠하게 하는 개념으로서 국내의 지상파 데이터방송 표준 규격이 ATSC (Advanced Television Systems Committee)-DASE (DTV Application Software Environment), 위성의 경우 DVB MHP (Digital Video Broadcasting - Multimedia Home Platform), 케이블은 OpenCable-OCAP(OpenCable Common Application Platform)으로 결정되었다. 이와 같이 국내에서 채택하고있는 데이터방송 규격은 매체별로 서로다른 규격을 따르고있으며 규격 표준화 진행은 완료되었거나 진행중에 있다. 따라서 본 고에서는 지상파, 위성, 케이블 데이터방송 표준동향과 매체별 데이터방송 표준 규격에 대해 살펴보고자 한다.

• Journal of Digital Convergence
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• v.12 no.8
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• pp.271-282
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• 2014

The recent flow of broadcasting technology, HDTV and 3DTV are being followed to develop UHDTV. UHDTV has established itself as the new paradigm. In Korea, the 4K-UHDTV experimental terrestrial broadcasting and cable and satellite TV services are being carried out in the present. 4K-UHD content creation workflow to enable a systematic formulation is needed. In this study, Through expert opinion 4K-UHD production workflow to derive the important topics and Hierarchical analysis methods (AHP, Analytic Hierarchy Process) is applied to 4K-UHD content creation is important to consider the items were compared to each other. The upper layer has a content creation workflow planning side, the media file management side and operational aspects of the selection and production equipment were classified. In the lower layer, UHD STAFF roles between production and training, media management, selection and operation of the storage device was evaluated in a relatively important. In addition, real-time 4K-UHD suggested workflow for production.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.111-118
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• 2012

When broadcasters want immediately a variety of VOD files in a distributed server of them data centers and away contents provider, CPs of different platform to exchange high-quality HD, 3DTV video and other video files over the IP networks of high-performance that can be transferred quickly and must be configured quickly. This paper, by using an optional encryption method to complement a QoS and security of public network, suggests high speed and secure content transmission protocol such as VPN(Virtual Private Network) for large video files and big data. As configured high performance VPN, end to end devices use the best of available resources over public network by parallel transfer protocol and the secure content delivery network.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.36S no.10
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• pp.21-29
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• 1999

This paper is concerning about the demapping method using the pilots inserted in transmitter in COFDM(Coded Orthogonal Frequency Division Multiplexing) demodulator which is the standard transmission method of terrestrial digital TV system in Europe(DVB-T). We have presented a simple and efficient method of CSI(Channel State Information) generation and demapping method using CSI. The CSI was derived from the pilot carriers inserted with comb-type among the received active carriers, which is defined as a SNR. From the simulation results for the 3 different constellations of the receiver, we could confirm that the system performance comparing with conventional soft decision method has been improved under DVB-T standard Rayleigh and Ricean fading channel.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.48 no.3
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• pp.13-18
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• 2011

In this paper, we explain capturing, postprocessing, and depth generation methods using multiple color and depth cameras. Although the time-of-flight (TOF) depth camera measures the scene's depth in real-time, there are noises and lens distortion in the output depth images. The correlation between the multi-view color images and depth images is also low. Therefore, it is essential to correct the depth images and then we use them to generate the depth information of the scene. The results of stereo matching based on the disparity information from the depth cameras showed the better performance than the previous method. Moreover, we obtained the accurate depth information even at the occluded or textureless regions which are the weaknesses of stereo matching.

• IEMEK Journal of Embedded Systems and Applications
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• v.7 no.1
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• pp.9-15
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• 2012

Recently, as the development of 3D contents service, production of 4D media that user can feel physical effects by the scene of movie has been increased. This 4D media uses the SMMD (Single Media Multiple Devices) method to give users enhanced effects with multiple devices playing rather than the SMSD (Single Media Single Device) method with single device playing in a smart TV environment. To give more sensible effects to users, from the beginning of making one media, we produced 4D media that consists of 3D contents and the SEM (Sensory Effect Metadata) to define effects of the scene. 4D media is transmitted to a HS (Home Server) to represent 3D contents in 3DTV and multiple devices with synchronized way. In this paper, we suggested the concept and overall 4D media broadcasting service system architecture, aggregator time acquisition, media time scheduling, real-sense device scheduling, evaluation results, user interfaces and implemented devices.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.131-133
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• 2012

최근 3D 입체 영화 및 3D 방송 기술의 개발과 더불어, 사용자의 몰입감을 극대화하기 위하여, 3D 입체영상과 사용자의 인터랙션 효과를 융합하는 3D 증감 방송 기술에 대한 요구가 높아지고 있다. 본 논문에서는 3D 증강방송을 위해, 3DTV 환경에서의 사용자 인터랙션 서비스에 대한 시나리오에 대해서 분석하고, 이를 바탕으로 제한된 시나리오를 위한 객체 인지 및 제어 기술에 대해서 소개한다. 본 논문에서 깊이 정보와 연계된 3D방송 환경을 가정하고, 이를 TV 환경에 적용했을 경우의 인터랙션 시나리오에 제시하였으며, 다 수의 깊이 카메라를 이용하여 시나리오에 필요한 객체 인지 방법에 대해서 제시한다. 키넥트 카메라를 이용한 구현을 통해 객체 인지 및 시점 전환 구현 결과를 보여준다.