|
| Name |
Explanation |
| Box |
Electronic equipment used to process television signals in a consumer's home, usually housed in a "box" that sits atop a TV set or VCR. |
| advanced television |
(ATV): A family of television systems that is intended to be improvements over current commercial-quality television. The ATV family includes improved-definition television (IDTV), extended-definition television (EDTV), and high-definition television (HDTV). |
| aspect ratio |
The ratio of the width to the height of a picture. |
| chroma keying |
In television, nearly instantaneous switching between multiple video signals, based on the state, i.e. , phase, of the color (chroma) signal of one, to form a single composite video signal. Note 1: Chroma keying is used to create an overlay effect in the final picture, e.g. , to insert a false background, such as a weather map or scenic view, behind the principal subject being photographed. Note 2: The principal subject is photographed against a background having a single color or a relatively narrow range of colors, usually in the blue. When the phase of the chroma signal corresponds to the preprogrammed state or states associated with the background color, or range of colors, behind the principal subject, the signal from the alternate, i.e ., false, background is inserted in the composite signal and presented at the output. When the phase of the chroma signal deviates from that associated with the background color(s) behind the principal subject, video associated with the principal subject is presented at the output. Synonym color keying. Colloquial synonym blue-screening. Contrast with chrominance signal, composite video. |
| chrominance signal |
In color television, that signal or portion of the composite signal that bears the color information. |
| closed circuit |
In radio and television transmission, pertaining to an arrangement in which programs are directly transmitted to specific users and not broadcast to the general public. |
| composite video |
In television, a video signal in which synchronizing information (pulses) and picture information, including chroma, i.e ., color, information are combined. |
| distribution-quality television |
Television conforming to the NTSC standard, the SECAM standard, the PAL standard, or the PAL-M standard. Synonym [in CCITT usage] existing-quality television. |
| extended-definition television |
(EDTV): Television in which improvements are made to the standard United States National Television System Committee (NTSC) television system, the improvements are receiver-compatible with the standard NTSC television system, and the improvements modify the standard NTSC television system emission standards. EDTV improvements may include a wider aspect ratio, a higher picture definition than NTSC definition, and any of the improvements used in improved-definition television (IDTV). When EDTV signals are transmitted in the 4:3 aspect ratio, it is referred to as "EDTV." When transmitted in a wider aspect ratio, it is referred to as "EDTV-Wide." |
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