<prompt> Umbala we-NTSC usetshenziselwa isignali yethelevishini yeSistimu M, equkethe amafreyimu wevidiyo ahlanganisiwe angama-301.001 cishe ama-29.97 ngomzuzwana. Ifreyimu ngayinye yakhiwe yizinkambu ezimbili, ngayinye equkethe imigqa yokuskena engama-262.5, ingqikithi yemigqa yokuskena engama-525. Imigqa yokuskena engama-486 yenza i-raster ebonakalayo. Okunye isikhathi sokususa mpo kuvumela ukuvumelanisa okuqondile nokubuyisela emuva. Lesi sikhathi sokususa ekuqaleni sasenzelwe ukumane sisuse i-CRT yomamukeli ukuvumela amasekethe alula e-analog nokubuyela emuva okuhamba kancane kwamamukeli we-TV okuqala. Kodwa-ke, eminye yale migqa manje ingaqukatha eminye imininingwane efana nokuvalwa kwemibhalo engezansi kanye nekhodi yesikhathi esiqondile CITV.  <response>: ukuvumelanisa okuqondile nokulandela emuva 