- The image of a standard TV 4:3 picture projected on a widescreen 16:9 aspect ratio television screen, often with black bars on the side. It's used to maintain the original aspect ratio of the source.
Advanced Television Systems Committee
ATV - Advanced Television
Digital Terrestrial Television - DTT
Improved Definition Television (IDT)
Interactive Digital Television
Instructional Television Fixed Service
Maximum Service Television (MSTV)
NTSC – (National Television System Committee)
See the Interactive Television Institute.