RECOMMENDATION ITU-R S.483-3*,** - Maximum permissible level of interference in a television channel of ... ANNEX 1 1 Multiple carrier interference 2 TV sound ANNEX 2 - Interference between TV/FM signals 1 Introduction 2 Subjective assessment of TV picture quality 3 Impairments due to thermal noise 4 Impairments due to co-channel interference caused by another TV/FM carrier 5 Multiple co-channel interferers 6 Impairments due to aggregate thermal noise and co-channel interference 7 Impact of desired TV/FM signal deviation 8 Development of protection masks 8.1 Protection ratio at zero offset (PR0) 8.2 Width of the plateau and slopes of the mask 9 Permissible level of interference 10 Direct-to-home (DTH) TV/FM transmission 11 Comparison of the developed masks with the available measured data 12 Usable results from further measurements 13 Conclusions