Bandwidth - The range of frequencies used to transmit the television signal, including picture and sound. Analog television signals have been allocated at 6 Megahertz for each over-the-air channel. Digital channels are allocated the same 6 Megahertz by Industry Canada. However, by the use of digital compression, a combination of up to 5 SDTV programs and/or one HDTV program can be carried in this 6 MHz digital channel.
Artefacts - Unwanted visible effects in the picture created by errors in the video processing or noise/interference in analog circuits. Common artefacts include 'edge crawl' or 'hanging dots' in analog pictures or 'blockiness', noise or 'contouring' in digital pictures.
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.
HD-Capable TV - A standard definition set with a digital tuner. (This term was probably invented to confuse people.)
Color temperature - This describes how white is displayed. Low temperature means slightly reddish, while high temperature means slightly bluish. Standard NTSC white corresponds to the color a glowing hot object would be at 6500ø K
Reverse 3 - 2 Pull-Down - DTV material originating on film at 24 fps is converted to the 30 fps of DTV by repeating field or frames, resulting in some motion artefacts. Some film presentations remove these repeated images before transmission and send a signal to the television causing it to process (termed Reverse 3 - 2 Pull-Down) this material appropriately to make it suitable for display. In this way, the displayed material closely matches the original film quality, avoiding the motion artefacts.
D/A - Conversion of digital signals to analog signals. Most set-top boxes decode the digital signals broadcast and then convert them to analog signal for interconnection to the display device.
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