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RECOMMENDATION ITU-R BT.1127 - RELATIVE QUALITY REQUIREMENTS OF TELEVISION BROADCAST SYSTEMS
ANNEX 1 - The relative quality requirements of television broadcast systems
1. Example of the classification of television systems
    1.1 High definition television
    1.2 Enhanced definition television
    1.3 Standard definition television
    1.4 Limited definition television
2. Design viewing distance and preferred viewing distance