數(shù)字視頻格式及時(shí)序.doc

數(shù)字視頻格式及時(shí)序從Consumer產(chǎn)品到Broadcast產(chǎn)品接觸到的數(shù)字化的處理越來(lái)越多，模擬的越來(lái)越少。以前關(guān)注模擬視頻的分析測(cè)試，現(xiàn)在則越來(lái)越多的要應(yīng)對(duì)數(shù)字視頻信號(hào)的處理。1：這里列出一些常用的數(shù)字視頻格式及時(shí)序以做參考。NameHactVactHtotVtotSTF/sHSYNC/sMSa/sHbnkVbnkHS2HA480i60720480858525i29.9715734.2513.513845122576i50720576864625i251562513.514449132480p60720480858525p59.9431468.52713845122576p50720576864625p50312502714449132720p2412807204125750p23.9761798274.176284530260241800074.25720p2512807203960750p251875074.25268030260720p3012807203300750p29.9722477.574.176202030260302250074.25720p5012807201980750p503750074.2570030260720p6012807201650750p59.944495574.17637030260604500074.251080i501920108026401125i252812574.25720451921080i601920108022001125i29.9733716.2574.17628045192303375074.251080p241920108027501125p23.9762697374.17683045192242700074.251080p251920108026401125p252812574.25720451921080p301920108022001125p29.9733716.2574.17628045192303375074.251080p501920108026401125p5056250148.5720451921080p601920108022001125p59.9467432.5148.352280451926067500148.5符號(hào) 單位 描述Name n/a Industry standard concise name for format視頻標(biāo)準(zhǔn)Hact pels Active Pixels Per Line水平有效像素Vact lines Active Lines per Frame每幀有效行數(shù)Htotpels Total Pixels Per Line每行總樣本數(shù)Vtot lines Total Lines per Frame每幀總行數(shù)ST n/a Scan Type (i=interlaced, p=progressive)掃描類(lèi)型（i-隔行掃描，p-逐行掃描）F/s F/s Frames per second幀頻（Hz）HSYNC/sF/s HSYNC frequency/line pre second行頻（Hz）MSa/s MHz Samples per second (i.e. pixel clock frequency)抽樣頻率Hbnk pels Blank Pixels per Line水平消隱間隔Vbnk lines Blank Lines per Frame垂直消隱間隔HS2HA pels HSYNC asserting edge to start of HACTIVE (in pels)有效起始像素/行同步信號(hào)有效觸發(fā)沿到有效行之間的抽樣時(shí)鐘周期2:數(shù)字視頻區(qū)分奇/偶場(chǎng)的辦法除了用邏輯分析儀看SAV/EAV值外最簡(jiǎn)單的方法是比較VSYNC和HSYNC信號(hào)的相位。如圖所示，奇場(chǎng)的VSYNC和HSYNC的觸發(fā)沿是對(duì)齊的，而偶場(chǎng)的VSYNC距離HSYNC的觸發(fā)沿的位置大概在行掃描周期一半的位置。3:1080i60和1080I/30兩種表述方式的由來(lái)：其實(shí)這兩種表述都指的是同一個(gè)視頻格式：都是每秒60場(chǎng)（30幀）的隔行掃描。1080I/30 是European Broadcasting Union（EBU）組織的習(xí)慣表述方式，EBU習(xí)慣用幀頻來(lái)表述。同理1080i50對(duì)應(yīng)1080I/25也是