[2] At an ITU meeting in autumn 1981, CCIR Study Group 11 approved document 11/1027 describing the parameter values for a unified digital video format.

AA/11 "Encoding Parameters for Digital Television for Studios" by the CCIR Plenary Assembly in February 1982, later becoming ITU-R Rec.

[2] Preparation preceded the CCIR approval, including laboratory testing around the world to validate the proposed parameter values.

International negotiations and efforts to build consensus were led by figures like Mark Krivosheev, Richard Green, and representatives from Japan and Europe.

Eight-bit code values from 1 through 15 provide footroom and can be used to accommodate transient signal content such as filter undershoots.

Similarly, code values 236 through 254 provide headroom and can be used to accommodate transient signal content such as filter overshoots.