Side Panels - 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)