Advanced Television Systems Committee

ATSC : The Advanced Television Systems Committee, Inc. (ATSC), is an international, non-profit organization developing voluntary standards for digital television. The ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries (http://atsc.org/about).

See also What is ATSC in hdtvprimer.com

ATSC specs: A total of 18 different formats
spec	Horizontal pixels	Vertical pixels	Aspect ratio	Monitor interface	Format name	Frames per sec	Fields per sec	Transmitted interlaced
ATSC	1920	1080	16:09	1080i	1080 60i	30	60	yes
					1080 30p	30	30	no
					1080 24p	24	24	no
	1280	720	16:09	720p	720 60p	60	60	no
					720 30p	30	30	no
					720 24p	24	24	no
	704	480	16:09	480p	480 60p	60	60	no
				480i	480 60i	30	60	yes
					480 30p	30	30	no
					480 24p	24	24	no
	704	480	04:03	480p	480 60p	60	60	no
				480i	480 60i	30	60	yes
					480 30p	30	30	no
					480 24p	24	24	no
	640	480	04:03	480p	480 60p	60	60	no
				480i	480 60i	30	60	yes
					480 30p	30	30	no
					480 24p	24	24	no
NTSC	640	483	4:03	Note 1	NTSC	30	60	yes
Note 1. Some people refer to NTSC as 480i