ITU R BT 655:2004
ITU R BT 655:2004 Radio-frequency Protection Ratios For Am Vestigial Sideband Terrestrial Television Systems Interfered With By Unwanted Analogue Vision Signals And Their Associated Sound Signals
Table of Contents
1Introduction2General
2.6.1Non-controlledcondition
2.6.2Non-precisionoffset
2.6.3Precisionoffset(seeAnnex4forthecaseof
625-linesystems)
3Synchronizedcarrieroperation
4Furtherstudies
1Protectionfromco-channelinterference
1.1Carriersseparatedbylessthan1000Hz,non-controlled
systemshavingthesameoradifferentline-standard
1.2Carriersseparatedbypartsofthelinefrequency
(f[line]),systemshavingthesameline-standard,
non-precisionoffset(seeTable1)
2Protectionfromadjacent-channelinterference
2.1Protectionfromloweradjacent-channelinterference,
VHFandUHFbands
2.2Protectionfromupperadjacent-channelinterference,VHF
andUHFbands
3Protectionfromimage-channelinterference
4Protectionfromoverlappingchannelinterference
4.1Protectionratiosforvisionsignalsinterferedwithby
terrestrialdigitalaudiobroadcasting(T-DAB)
5Televisionsignalaffectedbydatasignals
1Protectionfromco-channelinterference
1.1Carriersseparatedbylessthan1000Hz,non-controlled
systemshavingthesameoradifferentline-standard
1.2Carriersseparatedbymultiplesofatwelfthoftheline
frequencyuptoabout+/-36/12f[line](about+/-50kHz)
2Protectionfromadjacent-channelinterference
2.1Protectionfromloweradjacent-channelinterference
2.1.1VHFbands
2.1.2UHFbands
2.2Protectionfromupperadjacent-channelinterference,VHF
andUHFbands
3Protectionfromimage-channelinterference
4Protectionfromoverlappingchannelinterference
4.1Protectionratiosforvisionsignalsinterferedwithby
terrestrialdigitalaudiobroadcasting(T-DAB)
5Televisionsignalaffectedbydatasignals
1Introduction
2Normalizedprecisionoffsetbetween0/12and12/12f[line]
2.1Luminancerangeforall625-linesystems:
2.2ChrominancerangeonlyforPALandSECAMsystems
2.2.1PALsystems
2.2.2SECAMsystems
3Computationofoperationaloffsetfrequenciesinanetwork
withtransmittertriplets
3.1Example