Details are found in Luma/colour difference component sets, on page 352.

Component analog Y’PBPR interface, industry standard

Unfortunately, equipment from two manufacturers was deployed before SMPTE reached agreement on a standard component video analog interface for studio use. Although it is sometimes available as an option, the SMPTE standard is rarely used in 480i. Instead, two “industry” standards are in use: Sony and Panasonic. Ideally the Y’PBPR nomenclature would signify that luma has zero setup, and that colour difference components have the same excursion (from black to white) as luma. However, both of the industry standards use setup, and neither gives the colour difference components the same excursion as luma.

Sony SD equipment utilized 10:4 picture-to-sync ratio (roughly 714 mV luma, 286 mV sync) with 7.5% setup on luma (giving a picture excursion of

6605⁄7 mV). Colour differences range 4⁄3 times ±350 mV, that is, ±4662⁄3 mV. (75% colourbars have a PBPR excursion of ±350 mV.)

Panasonic SD equipment utilized 7:3 picture-to-sync ratio (exactly 700 mV luma, 300 mV sync) with 7.5% setup on luma (giving a picture excursion of 647.5 mV). Colour differences are scaled by the 37⁄40 setup fraction, for an excursion of ±323.75 mV.