Rec. ITU-R BT.709-5 1
RECOMMENDATION ITU-R BT.709-5
Parameter values for the HDTV* standards for production and international programme exchange
(Question ITU-R 27/11)
(1990-1994-1995-1998-2000-2002)

The ITU Radiocommunication Assembly,
considering
a) that for many years HDTV programmes have been produced in several countries;
b) that parameter values for HDTV production standards should have maximum commonality;
c) that two HDTV scanning standards, 1125/60/2:1 and 1250/50/2:1, were previously developed for that purpose, having a significant number of parameters which have been agreed on a worldwide basis, and for which some equipment remains in use;
d) that a HDTV common image format of 1 920 pixels by 1080 lines providing square pixel sampling and a number of interlace and progressive picture rates has been designed for digital television, computer imagery and other applications (in this Recommendation, the term pixel is used to describe a picture element in the digital domain);
e) that the parameters defined for all these systems meet the quality goals set for HDTV;
f) that film productions are an important programme source for HDTV broadcasting and, conversely, the use of HDTV production systems has significant benefits for film programme production;
g) that high-quality conversion between the various HDTV systems, as well as down-conversion to 525/625 television systems, has been successfully implemented;
h) that programmes produced and archived will not become obsolete using these standards,
recommends
1 that for HDTV programme production and international exchange, one of the systems described in Parts 1 or 2 of this Recommendation, should be used;
2 that for new HDTV programme production and international exchange, systems described in Part 2 are preferred.