Aspect Ratio - the ratio of image width to image height. The term may apply to the display device configuration, or the shape of the content being displayed. (See Letterboxing) HDTV uses an aspect ratio of 16 units wide by 9 units high. Conventional television programming and displays are at an aspect ratio of 4 - 3. Digital SDTV programs may aspect ratios from 4 - 3 to 16 - 9, dependant on content and its source (e.g. upconverted NTSC is likely to be 4 - 3).
Letterbox - The full display of a wide aspect ratio 16 - 9 picture on a display of aspect ratio 4 - 3 will result in black bars above and below the picture. This arrangement is referred to as "Letterbox" and is often seen during movies shown on television.
Interactive Television - This is when TV programming features interactive content and enhancements, blending traditional TV viewing with the interactivity of a personal computer.
4DTV - This is a DTV subscription service for C-band and Ku-band (a satellite service requiring an 8 foot dish).
Closed Captioning - A data stream included in broadcast signal that provides text and/or narrative description of dialogue, sounds, and other elements of the picture for viewers with visual or auditory impairments.
Multi-path interference - Some neighborhoods are plagued with this problem: - The signal finds more than one path to the antenna. Multi-path results from reflections off of buildings and diffraction around the sides of hills. For NTSC sets this will result in ghosts: multiple images shifted laterally. For DTVs the result can be an unusable signal, even though it may be strong. The solutions are moving the antenna or selecting a very directional antenna. Newer generations of DTV receivers are better able to cope with multi-path.
Fire Wire - A digital interface originated by Apple Computer that can transport data at 100, 200, or 400 Mbps. It is widely used to interconnect digital video devices, such as cameras and displays. Also referred to as IEEE- 1394.
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