This Recommendation describes users' requirements for objective measurements of perceptual video quality in digital video systems used in cable television and in similar applications. Such objective perceptual video quality measurements may be required for several applications, as described below. To measure the end-to-end performance of digital cable television systems from the signal source to the user's receiver. In this application the transmission chain includes the cable distribution system and may also include the satellite links, terrestrial links andor broadband network links that provide source signals to the cable head-end. To measure the performance of a section of the total chain, which is sufficiently limited to be equipped with auxiliary measurement devices at appropriate points along the section under test. To measure the performance of single pieces of equipment (e.g. codecs) or of local chains of equipment in a laboratory or at the cable head-end premises..
ITU-T J.143 SPANISH-2000 history
2000ITU-T J.143 SPANISH-2000 User requirements for objective perceptual video quality measurements in digital cable television