Aspect ratio - The ratio of screen width to screen height. For TVs it is either 4:3 (1.33:1) or 16:9 (1.78:1). Theater film uses many different aspect ratios, some as high as 2.5:1.
Cathode Ray Tube (CRT) - Hitachi is the leading manufacturer of the rear projection television glass picture tubes that house the electron gun and phosphor-coated faceplate. Hitachi rear projection televisions incorporate three monochromatic discrete high-output CRTs (one each for red, blue and green) that project the full-color image at the screen.
Noise - In image editing applications, a random pattern of unwanted pixels or pixel groupings called artifacts.
Treble - The upper range of audio frequencies, above approximately 4,000Hz.
Invar Shadow Mask - Helps provide greater resistance to the effects of heat produced by electron beam bombardment. This protection helps reduce the problem of colour blur from "doming" and assures consistently bright, sharp images in TVs.
Interactive Multi-Plot Movies - These offer the potential for full-motion interactive video adventure games. These films have enough space on the DVD to offer different directions for plot development and endings, according to choices made by the viewer.
Digital Convergence - Refers to the alignment of red, blue and green at a common point on a projection TV screen to produce white. In projection TV models with this feature, the red, blue and green images converge at more than 165 independent points on the projection screen. This method assures a more accurate initial convergence setting at the factory and a decreased likelihood that the convergence will require adjustment in the home environment. If adjustments are necessary, a repair person can readily make them with greater accuracy and in less time than with conventional methods.
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