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HDTV

HDTV. 2008. 9. 9. HDTV - High-definition television (HDTV) is a digital television broadcasting system with higher resolution than traditional television systems (analogue TV or standard-definition TV, or SDTV). 16:9 의 비율 1920 *1080 OR 1280x720) -atsc analog TV - ntsc, pal 등

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HDTV

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  1. HDTV 2008. 9. 9

  2. HDTV -High-definition television (HDTV) is a digital television broadcasting system with higher resolution than traditional television systems (analogue TV or standard-definition TV, or SDTV). 16:9의 비율 1920 *1080 OR 1280x720) -atsc analog TV - ntsc, pal 등 SDTV - 디지털방송 중 제일 하위규격 - 4:3 비율의 640 * 480 - dvd가 이 표준에 따르고 16:9비율의 720:480의 규격 -아날로그TV와 유사한 화질이나, 잡음이 없어 더 선명함 -atsc, DVB(Digital Video Broadcasting)

  3. History of high-definition television • The term ''high definition'' once described a series of television systems from the 1930s and 1940s • The British high definition TV service started trials in August 1936 • In 1969, the Japanese state broadcaster NHK first developed consumer high-definition television with a 5:3 aspect ratio. However, the system was not launched publicly until late in the 1990s. • In 1981, the first HDTV demonstration in the United States was held.(MUSE in Japan) • The rise of digital compression - MPEG-1,2 • The first HDTV sets went on sale in the United States in 1998. • Japan remained the only country with successful public broadcast analogue HDTV .but The single satellite transponder MUSE service was turned off on 01 January 2007 • It was not until the early 2000s that technology had progressed enough to deliver sufficient storage capacity and processing power to support compression.

  4. HDTV sources • Over the air with an antenna • Cable television companies often offer HDTV broadcasts as part of their digital broadcast service • Satellite-based TV companies • Video game systems • Most newer computer graphics cards have either HDMI or DVI interfaces • The optical disc standard [Blu-ray Disc] (25GB-50GB) can provide enough digital storage to store up to 10 hours of HD video content

  5. Notation • HDTV broadcast systems are defined threefold -The number of lines in the vertical display resolution. -The scanning system (progressive scan or interlaced scannig) -The number of frames per second or fields per second • The 720p60 format is 1280×720 pixels progressive scanning with 60 fields per second (120Hz). The 1080i50 format is 1920×1080 pixels (ie 2 MP) interlaced scanning with 50 fields per second (ex, Samsung pavv 설명서 : 1080i화질, 16:9) • Most HDTV systems support some standard resolutions and frame or field rates

  6. Standard Display Resolutions • Standard Definition usually refers to 480 vertical lines of resolution or more.

  7. High-Definition Display Resolutions • High Definition usually refers to 720 horizontal lines of video format resolution or more.

  8. Standard frame or field rates • 23.976p (allow easy conversion to NTSC) • 24p(cinematic film) • 25p (PAL, SECAM DTV progressive material) • 30p (29.97p in drop frame) (NTSC DTV progressive material) • 50i (PAL & SECAM) • 50p (PAL, SECAM DTV progressive material) • 60i (59.94i in drop frame) (NTSC, PAL-M) • 60p (59.94p in drop frame) (NTSC DTV progressive material)

  9. Technical details • MPEG-2 is most commonly used as the compression codec for digital HDTV broadcasts • HDTV is capable of "theater-quality" audio because it uses the Dolby Digital (AC-3) format to support "5.1" surround sound

  10. Mpeg • MPEG(엠펙)는 영문 Moving Picture Experts Group의 약자이며, 한국어로는 보통 동화상 전문가 그룹으로 부른다. 국제표준화단체로서의 공식 명칭은 ISO/IEC JTC1/SC29/WG11이다. • MPEG-1: 최초의 비디오와 오디오 표준. 비디오 CD의 표준으로 쓰였으며, MP3오디오 압축 포맷이 여기에 포함된다. • MPEG-2: 텔레비젼 방송을 위한 표준. 디지털 위성 방송, 디지털 유선 방송, 고화질 TV 방송, DVD비디오 등의 컴퓨터 멀티미디어 서비스에 쓰인다. • MPEG-4: MPEG-2를 확장하여 영상/음성 "객체", 3D 콘텐츠, 저속 비트율 인코딩, 디지털 재산권 관리 지원등을 포함한다. 멀티미디어 통신에서의 이용을 위해 만들어 지고 있으며 영상압축기술 인터넷과 이동 통신 환경에서 사용되고 있다. 흔히 이야기하는 MPEG-4 동영상 표준은 MPEG-4 Part 2 Visual에 해당하며, 흔히 H.264라 부르는 코덱이 MPEG-4의 Part 10 Advanced Video Coding으로 정의되어 있다. 또한, 3차원 모델을 압축하기 위한 3차원 메쉬 부호화(3D Mesh Coding]] 또한 지원한다. • MPEG-7: 멀티미디어 콘텐츠를 기술하기 위한 형식적 시스템. 이 표준은 검색 사이트에서 키워드로 동영상을 검색하는 등 다양한 종류의 멀티미디어 정보 검색에 사용할 수 있다. • MPEG-21: MPEG 은 이 미래의 표준을 멀티미디어 프레임워크라고 표현한다. • MPEG-1, MPEG-2, MPEG-4 등의 동영상 코딩 시스템에는 움직임 보상 등의 과정을 이용하여, 연속되는 두 그림 또는 근처의 그림들 사이의 차이를 경제적으로 전송함으로써 압축이 이루어진다.

  11. Advantages and Disadvantages of HDTV expressed in non-technical terms • Advatage -High-definition television (HDTV) yields a better-quality image than standard television does • Disadvantages -모든 디지털 HDTV 방송/저장 시스템에서는 손실 압축 방식이 사용되므로 원본 영상에 비해서 약간 왜곡 현상이 일어나게 된다. -The main problem is that many operators do not follow HDTV specifications fully. - Appropriate cabling must be used. Either HDMI or component video cables must be used to support a high-definition signal - interference in a digital television broadcast will freeze, skip, or display "garbage" information -In order to view HDTV broadcasts, viewers may have to upgrade their TVs at some expense

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