Access Card
This is a card that fits in your DBS receiver and allows access to specific channels while denying access to other channels. These cards are very similar to smart cards, however they have advanced security measures that do not allow them to be read in a standard smart card reader/writer.

Antenna
An antenna is the device you use to pick up television signals from an over the air broadcast. Antennas have come a long way since the simple rabbit ears back in the fifties, and can now be very powerful and accurate devices!

Artifact
An artifact is a part of you picture that does not look as it should appear. There are many things that can cause artifacts on a display, too many to get into detail here. Some different types of artifacts might be a stuck pixel, ghosting problems, motion artifacts, solarization, edge enhancements, as well as much more.

Aspect Ratio
The aspect ratio is defined by a televisions width to its height. The HDTV standard aspect ratio is 16:9 while the regular NTSC standard is 4:3.

ATSC
The Advanced Television Systems Committee, Inc. (ATSC), is an international, non-profit membership organization developing voluntary standards for the entire spectrum of advanced television systems. Specifically, ATSC is working to coordinate television standards among different communications media focusing on digital television, interactive systems, and broadband multimedia communications. ATSC is also developing digital television implementation strategies and presenting educational seminars on the ATSC standards.

ATTC
The Advanced Television Technology Center is a private, non-profit corporation organized by members of the television broadcasting and consumer products industries to test and recommend solutions for delivery and reception of a new U.S. terrestrial transmission system for digital television (DTV) service, including high definition television (HDTV).