DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

System Notation Color difference scaling
1 Component analog video, 480i
(EIA/CEA-770 and “SMPTE”) and
576i EBU N10; also, 480i
Panasonic M-II, zero setup
(Japan) a
2 Component analog video, 480i
Sony, 7.5% setupa 3 Component analog video, 480i
Sony, zero setup (Japan) a
4 Component analog video, 480i
Panasonic, 7.5% setup a
5 Composite analog NTSC, PAL
video (incl. S-video, Y’/C688,
etc.)
7 6 0 0 0 1 Y’ 145 P BP R,
7 6 0 0 0 1 Y’ EBU P BP R
6 6 6 0 1 1 Y’ 145 P B P R
7 6 1 0 4 1 Y’ 145 P BP R
6 6 7 0 4 1 Y’ 145 P B P R
various, typ.
7 6 0 0 0 1 Y’ EBUUV, 7 6 1 0 4 1 Y’ 145 IQ
The EBU N10 standard calls for 7:3 pictureto-sync
ratio, 700 mV luma excursion with
zero setup. PB and PR components are
scaled individually to range ±350 mV, an
excursion identical to luma.
Sony de facto standards call for 10:4
picture-to-sync ratio, 7.5% setup, and
black-to-white luma excursion of
approximately 661 mV. PB and PR components are scaled individually to
range 4⁄ 3 times ±350 mV, that is,
±4662 ⁄ 3 mV.
Sony de facto standards call for 10:4
picture-to-sync ratio, zero setup, and
black-to-white luma excursion of
approximately 714 mV. PB and PR components are scaled individually to
range 4 ⁄ 3 times ±350 mV, that is,
±4662 ⁄ 3 mV.
Panasonic de facto standards call for 10:4
picture-to-sync ratio, zero setup, and
black-to-white luma excursion of
approximately 674.5 mV. PB and PR components are scaled individually to
range 37 ⁄ 40 times ±350 mV, that is,
±323.75 mV.
U and V are scaled to meet a joint
constraint: Scaling is such that peak
composite video – luma plus modulated
chroma – is limited to 4 ⁄ 3 of the blankingto-white
excursion. Rotation and exchange
of axes (e.g., I and Q) cannot be
distinguished after analog encoding. There
is no standard component interface.
Table 24.2A Color difference systems for analog SDTV. The EBU N10 levels indicated in the
shaded (first) row are sensible but unpopular. Designers of 480i SDTV studio equipment are forced
to implement configuration settings for three interface “standards”: EBU N10 (“SMPTE”), Sony, and
Panasonic.
a The component analog interface for consumer equipment (such as DVD players) is properly
scaled Y’P B P R , according to EIA/CEA-770.2, cited on page 509. Some consumer equipment
has been engineered and deployed with incorrect Y’P B P R scaling. Certain consumer devices
have rear-panel connectors labelled Y, B-Y, R-Y, or YUV; these designations are plainly wrong.
CHAPTER 24 LUMA AND COLOR DIFFERENCES 299