Widescreen - see 16 - 9
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.
Encryption - The process of coding signals so that a specific code or key is required by the viewer to recover the data so encrypted. Without this key, the data is meaningless. Encryption is used to provide conditional access for private television services.
Multicasting - Term given to the sharing of the digital television channel among 2, 3, 4 or more individual programs and/or data services
Toslink - A fiber optic cable standard.
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.
LCD. (Liquid Crystal Displays) - A flat panel technology, using thin-film crystal techniques, widely used in laptop computers, other small portable displays and more recently in televisions. Image brightness can be very high and color performance can be good. For HDTV, wide-screen displays of adequate resolution are available up to about 94 cm (37 in.) for direct viewing. LCD devices are also widely used as the key element in many projection televisions, both front and rear screen, up to very large sizes.
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