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High Speed Amplifiers for Video Applications
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Video Groups & Specifications
NTSC :National Television System Committee. The US form of standard definition TV.
日语可恶PAL :Pha Alternating Line. The system of standard definition TV implemented in Europe & elwhere.SECAM :Sequential Couleur avec Memoire. The French form of standard definition TV.
ATSC:Advanced Television Systems Committee. The US form of high definition TV (HDTV).
VESA:Video Electronics Standards Association. Propos, publishes video standards for Graphics. ITU:International Telecommunications Union. Propos, publishes video standards for broadcast in EU.SMPTE:Society of Motion Picture & TV Engineers. Propos, publishes standards for broadcast in US.MPEG:Motion Picture Experts Group. Propos and publishes video standards for Broadcast. EIA 770.1:The US spec for Enhanced Component video, similar to ITU-R BT1197/ETSI 300 294.EIA 770.2:The US spec for Standard Definition TV (SDTV) Baband Component Video.新航道雅思培训
EIA 770.3:The US spec for High Definition TV (HDTV) Baband Video.
ITU-R BT.470:Harmonized spec for SDTV world wide, including NTSC, PAL, and SECAM.
ITU-R BT.601:Universal Sampling spec for SDTV and HDTV Broadcast Video. Similar to SMPTE125M.ITU-R BT1197/ETSI 300 294:Spec for PAL Plus Enhanced TV in Europe.
SMPTE 125M:Similar to ITU-R BT.601.
SMPTE 170M :Has replaced EIA RS 170A, color spec for NTSC.
SMPTE 253M :RGB Analog Video Interface spec for SDTV Studio applications.
SMPTE 274M :Spec for 1920x1080 HDTV.talkback
SMPTE 296M :Spec for 1280 x 720 RGB and YPbPr Baband Video. Similar to PAL Plus.
Analog TV Standards SD/HD TV standards -US SD/HD TV standards –WW
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NTSC/480i (Interlaced)
–720 (H) x 480(V) active video resolution (720 x 240 active / field)
–858 x 525total resolution
–V refresh rate (frame rate) : 29.97 Hz (59.94 Hz field rate)
–H scan line rate : 15.734 kHz
PAL/576i (Interlaced)
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720 x 576active video resolution (720 x 288 active / field)–
864 x 625total resolution –
V refresh rate (frame rate) : 25 Hz (50 Hz field rate)–
H scan line rate : 15.625 kHz – a lot of variations (PAL I, B, G, H, D, N, M)
人们常常按照每帧的有效垂直分辨度和扫描类型来表述视频信号的格式，这里I表示隔行（interlaced）扫描、P 表示逐行（progressive）扫描。
在隔行扫描格式中，一帧视频画面分两场来扫描。
以PAL 制式为例，则首先扫描包含#1-312.5行的奇数场。
然后再扫描包含#312.5-625行的偶数场。
奇数、偶数场都以50场/秒的速率扫描，这等于25帧/秒。
480i 格式具有总共525行的垂直分辨度（包括有效行和消隐行）。
576i 格式具有总共625行的垂直分辨度。
480p (Progressive)
–720 x 480active video resolution
–858 x 525total resolution
已有–V refresh rate: 59.94 Hz
–H scan line rate: 31.469 kHz
至死不渝的英文
576p (Progressive)
–720 x 576active video resolution
–864 x 625total resolution
–V refresh rate: 50 Hz
–H scan line rate: 31.25 kHz
4在逐行扫描格式中，所有的扫描线都在一帧或者一场中扫描，这样就生成了分辨度更高的画面，并降低了扫描线的可见性和画面的闪烁。
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High Definition (HDTV)Formats and Timing
720p (Progressive)
–1280 x 720active video resolution, “wide-screen format”16:9 (H:V) aspect ratio
–1650 x 750total resolution
–V refresh rate: 59.94 Hz
–H scan line rate: 44.955 kHz新视野大学英语读写教程第四册课文翻译
–Tri-level sync
1080i @ 59.94 Hz* (Interlaced)
长春日语培训–1920 x 1080active video resolution (1920 x 540 active / field), 16:9 aspect ratio
–2200 x 1125total resolution
–V refresh rate (frame rate): 59.94 Hz (29.97 Hz field rate)
afford是什么意思
–H scan line rate: 33.716 kHz
–Tri-level sync
* other refresh rates like 24, 25, 30 Hz, etc. See SMPTE 274M specs.
两种主要的高清晰电视（HDTV）格式：720p 是逐行扫描格式，1080i 则是隔行扫描格式。
outrageous
这两种格式的屏幕宽高比（aspect ratio）都是16:9，屏幕宽高比就是水平和垂直分辨度之比。16:9的屏幕宽高比能够很好地再现“宽银幕”电影院的画面格式。标准电视格式的屏幕宽高比则接近于4:3。为了达到HDTV 同步分离更严格的要求，三电平同步是非常重要的，我们将在下面来讨论。
