• Title/Summary/Keyword: Digital broadcasting

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Multi-channel Audio Service in a Terrestrial-DMB System Using VSLI-Based Spatial Audio Coding

  • Seo, Jeong-Il;Moon, Han-Gil;Beack, Seung-Kwon;Kang, Kyeong-Ok;Hong, Jae-Keun
    • ETRI Journal
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    • v.27 no.5
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    • pp.635-638
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    • 2005
  • Spatial audio coding (SAC) is an extremely high compact representation of encoded multi-channel audio material. This paper suggests a multi-channel audio service in the terrestrial digital multimedia broadcasting (T-DMB) system using a novel SAC tool, which is called a virtual source location information (VSLI)-based SAC tool. Intensive experiments are presented to evaluate the validity of the proposed VSLI-based SAC tool, and prototypical systems are also presented to demonstrate the reliability of the proposed multi-channel T-DMB system in real applications.

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Disparity-Compensated Stereoscopic Video Coding Using the MAC in MPEG-4

  • Cho, Suk-Hee;Yun, Kug-Jin;Ahn, Chung-Hyun;Lee, Soo-In
    • ETRI Journal
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    • v.27 no.3
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    • pp.326-329
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    • 2005
  • The MPEG-4 multiple auxiliary component (MAC) is a good mechanism to achieve one-stream stereoscopic video coding. However, there is no syntax or semantics for the residual texture data of the disparity-compensated image in the current MAC. Therefore, we propose a novel disparity-compensated coding method using the MAC for stereoscopic video. We also define a novel MAC semantics in MPEG-4 so as to support the proposed coding algorithm. The major difference between the existing and proposed coding methods using the MAC is the addition of the residual texture coding.

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Pilot-Aided Iterative Frequency Offset Estimation for Digital Video Broadcasting Systems (디지털 비디오 방송 시스템에서의 파일럿을 이용한 반복적 주파수 옵셋 추정방법)

  • Lee, Kyung-Taek;Seo, Jong-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.5A
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    • pp.484-489
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    • 2007
  • The main disadvantage of orthogonal frequency division multiplexing (OFDM) systems is its sensitivity to carrier frequency offset and timing offset. This paper proposes a simple way of improving the performance of the integer frequency offset (IFO) estimator in OFDM-based digital video broadcasting (DVB) system. By modifying the conventional maximum likelihood (ML) estimator to have multi-stage estimation strategy, IFO estimator is derived. Simulations indicate that the proposed IFO estimator works robustly with reduced computational burden when compared to ML estimator.

An Investigation of Satellite Radio Access Technology for Beyond IMT-2000 Systems

  • Kang Kunseok;Ryoo Sunheui;Kim Byoung Gi;Kim Sooyoung;Ahn Do Seob
    • Journal of Communications and Networks
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    • v.7 no.2
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    • pp.135-143
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    • 2005
  • This paper presents an investigation of satellite radio access technology for beyond IMT-2000 systems. Although we could not see any active role of a satellite system in the 3G networks, satellite system will provide strong advantages in future systems for certain applications. Because a satellite link has longer round trip delay than a terrestrial link, we need technologies that would make the satellite component especially efficient. After presenting the satellite radio interface of the 3G system, we suggest several points which need to be considered in the beyond 3G systems. We also suggest a few candidate technologies with various simulation results.

Real Time Watermark Embedding/Detecting System for HDTV

  • Hahm Sang Jin;Lee KeunSik;Park KenuSoo
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2004.11a
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    • pp.285-288
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    • 2004
  • High-quality digital broadcasting contents are susceptible to illegal copy and unauthorized redistribution, which makes broadcasters difficult to protect valuable media assets. So, broadcasters and content providers need the technology for copyright protection of professional digital content. Digital watermarking technology is one of the most actively developed solutions for the copyright protection. This paper suggests the requirements of watermarking technology in DTV(Digital TV) environment for copyright protection and shows the developed real-time watermark embedding/detecting system for HD(High Definition)/SD(Standard Definition) video and experimental results of the system against watermark attack tests. Our watermarking system meets the watermarking requirements of invisibility, robustness and security of DTV environment.

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Enhanced MP4 Streaming by using Schedule Information of Image Objects (영상 객체 스케줄 정보를 이용한 MP4 스트리밍 개선)

  • Jeong, Se-Yoon;Cha, Ji-Hun;Kim, Hyun-Cheol;Kim, Kyu-Heon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2005.11a
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    • pp.159-162
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    • 2005
  • 본 논문에서는 기존의 비디오와 오디오 중심의 멀티미디어 스트리밍 방법과는 달리 정지 영상의 스케줄 정보도 고려하여 전체 스트리밍의 QoS (Quality of Service)를 높이는 스트리밍 방법을 제안한다. MP4 콘텐츠의 분량이 커지고 내용이 복잡해질수록 비디오와 오디오 이 외의 데이터들을 더 이상 무시할 수 없게 된다. MP4의 장면 구성 정보를 알면 임의의 시점에서 재생되는 화면과 소리를 알 수가 있고, 이 정보, 즉 스케줄 정보를, 고려하여 정지영상 객체를 전송한다면 보다 효율적인 스트리밍이 가능하다 또한, 비디오와 오디오에 스케일러블 부호화를 적용하면 QoS를 높일 수 있듯이, 정지영상의 경우 Progressive JPEG을 이용하면 스케일러블한 전송이 가능하다. 이에 제안된 스트리밍 서버에서는 정지 영상 스케줄 정보와 정지 영상 객체를 Progressive JPEG으로 변환하여 스트리밍 서비스를 제공하고 있다.

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An Efficient Type Codec for Point Data in Lightweight Applications Scene Representation (LASeR)

  • Joung, Ye-Sun;Cha, Ji-Hun;Cheong, Won-Sik;Lim, Young-Kwon;Kim, Kyu-Heon
    • ETRI Journal
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    • v.27 no.6
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    • pp.818-821
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    • 2005
  • Recently, MPEG has opened activity to standardize scene representation for lightweight applications such as in mobile phones. The standard is named lightweight applications scene representation (LASeR) and can be applied to improve and make efficient rich media applications and services on mobile devices. In this standard, we proposed an efficient type codec for point data to maximize the bit efficiency of LASeR. In this paper, we describe the new method and the test results of the proposed scheme.

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Docking Station Implementation using Portable Media Player (이동식 미디어 플레이어를 이용한 도킹 스테이션 설계)

  • Jung, Eun-Sug;Ryu, Conan K.R.
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.10a
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    • pp.938-941
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    • 2011
  • A docking station design using portable media player for receiving and storing in digital broadcasting is presented in this paper. The receiving and storing for digital broadcasting contents is equipped with setup box. That enables to be removable and portable with multimedia player, and the portable media player is driving by Android operating system. The results of the implementation, this system enables to receive digital broadcasting, DMB, satellite broadcasting and territory broadcasting, and to store video image in real time.

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Personalized Interstitial Content Service for Second TV (Second TV를 위한 맞춤형 광고 서비스)

  • Lee, Jong-Seol;Shin, Sa-Im;Lim, Tae-Beom;Lee, Seok-Pil
    • IEMEK Journal of Embedded Systems and Applications
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    • v.3 no.4
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    • pp.229-234
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    • 2008
  • The 'Anytime, Anywhere' services have been the biggest topic in the recent digital broadcasting research area. The related applications for the Anytime and Anywhere Services are as follows: the personalized broadcasting based on the PVR (Personal Video Recorder) for the Anytime Services, and the DMB (Digital Multimedia Broadcasting), the mobile devices supporting the wireless network and the Second TV and so on for the anywhere services. The personalized broadcasting has been researched on the one of the killer applications in the various broadcasting environment - the ground wave broadcasting, the satellite broadcasting, IPTV and CATV broadcasting suchlike. The applied contents of the personalized broadcasting have advanced from the main contents for the broadcasting to the interstitial contents like advertisements and coupons, the personalized interstitial broadcasting needs to develop the technology about the generation, storing and management of the interstitial metadata. but, the personalized broadcasting has the limitation that the TV environment is somewhat difficult to support the personalized broadcasting individually, because all family usually share the main TV at home. The Second TV is possible to solve the environmental limitation. This paper designs and develops the static set top box at home, the Second TV and their multimedia streaming techniques for the personalized broadcasting of the contents including the interstitial contents.

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Efficient Multiplexing Scheme of Stereoscopic Video Sequences for Digital Broadcasting Services

  • Yun, Kug-Jin;Kim, Kyu-Heon;Hur, Nam-Ho;Lee, Soo-In;Park, Gwang-Hoon
    • ETRI Journal
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    • v.32 no.6
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    • pp.961-964
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    • 2010
  • This letter introduces a stereoscopic video broadcasting system that provides 3D visual service and has full backward compatibility with legacy digital television (DTV) service in the same channel capacity. The proposed stereoscopic video broadcasting system in this letter is composed of both a hybrid codec and a multiplexer with a newly defined stereoscopic-related signaling method. In conclusion, the proposed method can be effectively applied for 3D broadcasting services without major changes in legacy broadcasting platforms.