1、Rec. ITU-R BT.798-1 1RECOMMENDATION ITU-R BT.798-1DIGITAL TELEVISION TERRESTRIAL BROADCASTING IN THE VHF/UHF*BANDS(Question ITU-R 121/11)(1992-1994)Rec. ITU-R BT.798-1The ITU Radiocommunication Assembly,consideringa) that Question ITU-R 121/11 addresses the terrestrial broadcasting of digital HDTV s
2、ignals;b) that digital television terrestrial broadcasting (which includes HDTV) may be introduced by some countries inthe VHF/UHF bands;c) that the VHF/UHF bands are currently used for analogue television broadcasting (Recommendation ITU-RBT.470) , and they are quite congested in some countries;d)
3、that consequently the VHF/UHF terrestrial bands will likely be shared between analogue televisionbroadcasting and digital television broadcasting,recommends1. that digital television terrestrial broadcasting should fit in the channels (6, 7 and 8 MHz) intended for analoguetelevision emission in the
4、VHF/UHF bands;2. that digital television terrestrial broadcasting, as an objective, should not cause interference subjectivelygreater than that considered acceptable with current broadcasting services in the VHF/UHF bands;3. that digital television terrestrial broadcasting should have sufficient immunity against interference to be able toco-exist with current broadcasting services in the VHF/UHF bands._*VHF/UHF television broadcasting is contained in bands I-V
