Big Book OF AV Europe Edition Page 381 Appendix and Glossary

GLOSSARY 381 U Ultra High Definition TV ( 4K) Refers to high-resolution digital displays and video formats with horizontal resolution of around 4000 pixels. The pixel count for this type of TV is 3840 x 2160, which is twice the horizontal and vertical resolution of 1080p (1920 x 1080 pixels). 4K has four times the total pixels of 1080p and is capable of creating a much more detailed picture. Upconversion The term used to describe the conversion of a lower resolution to an apparently higher one. This process increases the number of pixels and/or frame rate and/ or scanning format used to represent an image by interpolating existing pixels to create new ones at closer spacing. V V-Chip The FCC (Federal Communications Commission) began requiring that TVs include V-Chip technology to block the display of television programs based on their rating. All sets with screens 13 inches or larger manufactured after January 1, 2000, must include the V-Chip. Broadcasters are required to encode an electronic signal in TV programs indicating the level of violence, language and sexual content. Parents can program the TV with a rating so that when the the V-Chip reads a show's signal, it will prevent it from displaying if it is above the rating. Viewing Angle Measures a video display's maximum usable viewing range from the center of the screen, with 180 being the theoretical maximum. Most often, the horizontal (side to side) viewing angle is listed, but sometimes both horizontal and vertical viewing angles are provided. For most home theater setups, the horizontal viewing angle is more critical. WXYZ Watt A unit of electrical power. A watt of electrical power is the use of one joule of energy per second. Watts of electrical power equals volts times amperes. Wavelength Sound that passes through air produces a wavelike motion of compression and rarefaction. Wavelength is the distance between two identical positions in the cycle or wave. Similar to ripples or waves produced by dropping a stone in water. Length of sound wave varies with frequency. Low frequency equals longer wavelengths. White Noise A full audio spectrum signal with the same energy level at all frequencies. White noise has much more treble energy than pink noise. Widescreen Widescreen refers to a television or display panel using a 16:9 aspect ratio. 16:9 is the aspect ratio of movie screen and widescreen DTV formats used in all HDTV. WAN Wide Area Network; a data communications system that uses telecommunications circuits to link local area networks (LANs) that are distributed over large geographic distances. WLAN Wireless Local Area Network; a network that shares information by radio frequency (RF).

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