Compression - A method of reducing the number of bits required to store or transmit programs by the removal of redundant and/or non-critical information in the digital picture and sound. The DTV broadcasting standard for Canada, uses the MPEG-2 video and the AC-3 audio compression coding. Compression allows the delivery of more programs in a single channel.
Virtual channel number - This is the channel the consumer thinks he is watching. The actual (physical) channel is selected by a hidden mechanism.
Set-top box (STB) - A box, similar to the familiar cable box, that is capable of receiving, decoding and sending to the associated television the picture and sound of the selected DTV broadcast. The use of an STB would allow the use of conventional televisions to receive DTB programs, but at reduced levels of resolution and with imperfections due to aspect ratio differences, leading to letterboxing or cropping of the sides of the picture.
Addressable Resolution - The highest resolution signal that a display device (television or monitor) can accept as input. Some display devices may not be capable of displaying such signals and may downconvert them to a lower resolution prior to display.
LNB - (Low Noise Block converter) - An LNB can be found at the focus point of a dish antenna. It is a low noise amplifier that also converts the signal to a lower frequency. (The original higher frequency would not travel very far in ordinary coaxial cable.)
DLP (Digital Light Processing) - A technique in which the displayed image is produced by an array of dynamic micro-mirrors formed on a chip, each reflecting some of the light source to form a pixel on the screen. Each micro-mirror controls the level of the light sent to the screen for its pixel. Resolution is set by the size of the mirror array and versions suitable for wide-screen HDTV are now in production for uses in both front and rear projection televisions.
Interactive Television - This is when TV programming features interactive content and enhancements, blending traditional TV viewing with the interactivity of a personal computer.
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