Big Book OF AV Europe Edition Page 369 Appendix and Glossary

GLOSSARY 369 Decibel The measure of sound loudness. One dB is considered to be the smallest change in sound loudness that is perceptible to the human ear. Decibel, A-Weighted (dBA) Unit representing the sound level measured with the A-weighting network on a sound level meter. Decibel, C-Weighted (dBC) Unit representing the sound level measured with the C-weighting network on a sound level meter. Deep Color A color resolution standard associated with High Definition TVs and video gear that include HDMI 1.3 connections. Deep Color supports 10-bit, 12-bit and 16- bit color bit depths, up from 8-bit, which is the current standard for consumer video. De-interlacing The process of converting an interlaced-scan video signal (where each frame is split into two sequential ields) to a progressive-scan signal (where each frame remains whole). De-interlacers are found in HDTVs and progressive-scan DVD players. Diaphragm In a speaker, the part driven by the voice coil that moves, producing air waves that we perceive as sound. It usually has the shape of a cone or dome. Diffusion The scattering or random reflection of a sound wave from a surface. The directions of reflected sound is changed so that listeners may have sensation of sound coming from opposite directions at equal levels. Digital Audio The representation of a waveform with bits of information that are discreet (non-continuous) in both time and amplitude. See PCM and Analog. Digital Audio Output A connection found on HDTVs and HDTV tuners for sending the Dolby Digital soundtrack of HDTV broadcasts to an AV receiver with Dolby Digital decoding. The two most common types of digital output are coaxial and Toslink optical. Display Resolutions 1080i 1080i means the resolution of the picture is 1,920 vertical pixels by 1,080 horizontal pixels and i stands for interlaced scanning. 1080p 1080p means the resolution of the picture is 1,920 vertical pixels by 1,080 horizontal pixels and p stands for progressive scanning. 720p 720p means the resolution of the picture is 1,280 vertical pixels by 720 horizontal pixels and p stands for progressive scanning. Distortion Audio distortion: The name given to anything that alters an original input signal other than changing its amplitude (loudness). DIY Acronym for do-it-yourself, usually referring to various hobbies, especially audio-related. DLP (Digital Light Processing) A projection TV technology developed by Texas Instruments, based on their Digital Micromirror Device (DMD) microchip. Each DMD chip has an array of tiny swiveling mirrors which create the image. Depending on the TVs resolution, the number of mirrors can range from several hundred thousand to over 2 million. DLP technology is used in front- and rear-projection displays, and projectors. Dolby Digital Dolby Digital, also called Digital 5.1 or AC-3, is a five- channel surround sound system that delivers CD-quality digital audio and provides five channels of full frequency for front left, front right, center, surround left and surround right speakers, plus one channel for LFE (low frequency effect) subwoofer. Dolby Pro Logic Rather than producing surround sound from 5 or more discreet channels, as later surround sound formats like Dolby Digital do, the surround information is synthesized from a two-channel source. Since it is often used as a default format newer, versions are still being developed.

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