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.)
Computer Input - Some HDTV sets have an input like SVGA or VGA that allows the TV sets to be connected to computers.
Interlaced Scanning - Some HD televisions and most conventional televisions use the "interlace" method of scanning, in which the picture is transmitted and painted on the screen in two passes. In the first pass, every other line is painted and in the second, the lines in between. Some display types, such as LCD, plasma and DLP cannot display directly images transmitted as interlaced signals and must convert them to a progressive format prior to their display.
Virtual channel number - This is the channel the consumer thinks he is watching. The actual (physical) channel is selected by a hidden mechanism.
VGA - This acronym is short for the "Video Graphics Array" display mode. VGA resolution is 640 x 480 pixels.
Cable card - The Cable Card is the mechanism the industry has adopted to prevent the piracy of cable services. The cable company will periodically mail out new cable cards, ask their customers to plug them into the TV, and then disable the old cards, so anyone without a new cable card would lose service.
VSB - " Vestigial side band." VSB is an analog modulation technique used to reduce the amount of spectrum needed to transmit information through cable TV, or over-the-air broadcasts.
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