67/645 - Older lens mounts made by Pentax.
Progressive Scanning - A system of video scanning where lines of a picture are displayed consecutively (unlike interlaced).
Video-on-Demand (VOD) - A programming library service offering the individual viewer the choice of the available content on demand. When the program is requested and confirmed (by telephone or Internet) it is then delivered to the viewer over an available channel in encrypted form. VOD services are generally arranged on a "Pay per View" basis, analogous to the cinema.
ALiS (Alternate Lighting of Surfaces) Plasma Technology - Hitachi's advanced plasma display design that eliminates the physical grid structure common with conventional plasma designs. ALiS produces a smooth, seamless image, especially noticeable when viewing curves or diagonals. ALiS has been developed to perfectly match the viewable center 1024 lines of a 1080 interlaced HDTV signal, a precise line-for-line display, with no distracting vertical scaling artifacts.
Hi-Resolution CRT - With hi-resolution CRT (Cathode Ray Tube), high definition image sources, such as HDTV, require a picture tube with a small dot pitch to adequately display the details in the picture.
Liquid Coupling - A liquid-filled connection between the CRT and the lens assembly of a projection television that makes it a single optical unit. Hitachi's patented Super Contrast Lens system utilizes a deeper liquid coupling chamber which reduces refraction and reflections between the CRT and lens, thus optimizing contrast and color accuracy. The liquid also acts as a coolant, keeping operating temperatures at proper levels during high-output performance.
Hi-Fi Audio - An audio signal that is more accurately reproduced for better sound quality.
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