I whakatūria te National Television System Committee i te tau 1940 e te United States Federal Communications Commission (FCC) hei whakatau i ngā pakanga i waenganui i ngā kamupene mō te whakataki i tētahi pūnaha pouaka whakaata ā-motu i roto i te United States. I te Maehe o te tau 1941, i whakaputaina e te komiti he paerewa hangarau mō te pouaka whakaata pango-me-ma, i hanga i runga i te taunakitanga 1936 i hanga e te Radio Manufacturers Association (RMA). I whakaaetia e ngā ahunga whakamua hangarau o te tikanga o te pae taha o te taha ki te whai wāhi ki te whakanui ake i te taumira o te whakaahua. I tīpakohia e te NTSC nga raina 525 hei whakataurite i waenganui i te paerewa matawai 441 o RCA (kua whakamahia e te whatunga pouaka whakaata NBC o RCA) me te hiahia a Philco me DuMont ki te whakanui ake i te maha o nga raina matawai ki te whiriwhiri i waenganui i te 605 me te 800 paerewa. Ko te auau o te whārangi 30 (whakaahua) mo ia hekona, e rua nga raina i waenga i te 262.5 me te 60
525 ngā