SDTV - "Standard Definition Television." SDTV are based on 480 lines of vertical resolution and may have either 4 - 3 or 16 - 9 aspect ratios, and surround sound. Several SDTV programs are sent together to form the simulcast bundle. While SDTV pictures are of significantly better quality than NTSC, they are not up to the standard of HDTV.
AACS - Advanced Access Control System. A computer specification for guarding next-generation optical-media content created by the film, electronics, and software industries.
ATSC - (Advanced Television System Committee technical standard) - This is the name of the technology used by terrestrial digital TV stations in the U.S.
Multicasting - The option to multicast was made possible by digital technology to allow each digital broadcast station to split its bit stream into 2, 3, 4 or more individual channels of programming and/or data services. (For example, on channel 7, you could watch 7-1, 7-2, 7-3 or 7-4.)
Pixel - A picture element; a single displayable video dot. HDTV requires from 1 to 2 million pixels in the display for full resolution images to be shown.
OTA - (over the air) - There are about 1500 OTA (terrestrial) TV stations in the U.S.
Fire-wire - (see IEEE 1394)
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