NAB

National Association of Broadcasters

NHK

Nippon Hoso Kyokai, principal japanese broadcaster

Non-intra coding

Coding of a macroblock or picture that uses information both from itself and from macroblocks and pictures occurring at other times.

NTSC (National Television System Committee)

USA video standard with image format 4:3, 525 lines, 60 Hz and 4 Mhz video bandwidth with a total 6 Mhz of video channel width. NTSC uses YIQ NTSC-1 was set in 1948. It increased the number of scanning lines from 441 to 525, and replaced AM-modulated sound with FM.