视频入门－DTV_SystemTechnicalDocumentation.pptVIP

ATO DTV System Technical Documentation ATO HW Team July, 2003 Topic of Technical Data Fundamental functions of DTV System Color space Analog Input Signal Digital data format Input Input Capture Control Frame Rate Conversion Image/Video enhancement Scalar De-interlace OSD PIP POP Output Display control Color Space Color space for Color Difference Video Signal Signal and Color Space Analog Signal TV (CVBS), Composite signal (YUV color space) AV, Composite (YUV color space) S-video, Y/C signal (YUV color space) Component, Y/R-Y/B-Y (YUV color Digital 480i– SDTV (YUV) 480p, 720p, 1080i, 1080p---HDTV (Y709CbCr(YPbPr) color space) YUV Color Space YPbPr Color Space (for HDTV) Input Signal Type RGB DVI CVBS YC Component SDTV HDTV Video Signal Evolution RGB Input Signal level: 1.4Vp-p/2.0Vp-p Signal level Before ADC: 0.7Vp-p/1.0Vp-p Impedance is 75 Ohm Terminator Resister is 75 Ohm Sync level is 300mV Sync type: Composite Sync Separate Sync DVI Digital Data Signal type: Differential signal Signal level: Low noise signal Long distance transmission Differential impedance: 50 Ohm Single ending impedance: 100 Ohm CVBS - NTSC Resolution: 525 lins, 60 fields per second Bandwidth Y bandwidth:0 ~ 4.2 MHz U or V bandwidth: 1.3MHz Color carrier freq (Fsc): depend on different NTSC Audio carrier freq: 4.5MHz Channel Bandwidth : 6 MHz Video decoder sampling clock 6MHz * 2 (using 13.5MHz) Color space, YUV NTSC = Y+C = Y +( Usinωt + Vcosωt) + Sync, ω = 2πFsc Fh, Fv and Fsc CVBS- NTSC Bandwidth CVBS- NTSC Bandwidth CVBS - NTSC CVBS-NTSC Waveform CVBS-NTSC Color Bars Analog Video-CVBS waveform CVBS- NTSC Variations CVBS-PAL Signal Resolution: 625 lins, 50 fields per second Bandwidth Y bandwidth: depend on different PAL U or V bandwidth: 1.3MHz Color carrier freq (Fsc): depend on different PAL Audio carrier freq: depend on different PAL Channel Bandwidth : depend on different PAL Color space, YUV NTSC = Y+C = Y +( Usinωt + Vcosωt) + Sync, ω = 2πFsc Fsc CVBS- PAL Wav