| A | B |
|---|
| 480p | low level scanning system each frame containing visible lines scanned one after another |
| 720p | middle level scanning system each frame containing visible lines scanned one after another |
| 1080i | The highest picture quality and fastest image creation |
| analog | A signal that fluctuates exactly like the original stimulus. |
| binary digit | a bit- the smallest piece of digital info |
| codec | Stands for compression-decompression. Can be one of several compression systems of digital video, graphics, and audio files. |
| compression | The temporary rearrangement or elimination of redundant picture information for easier storage and signal transport. |
| high-definition television (HDTV) | Includes the 720p, 1080i, and 1080p scanning systems. Because the 480p system produces high-quality video, it is sometimes, though erroneously, included in the HDTV category. |
| digital | Pertaining to data in the form of binary digits (on/off pulses). |
| frame rate | The time it takes to scan a complete frame; usually expressed in frames per second (fps). In analog (NTSC) television, there are 60 fields, or 30 frames, per second. In DTV the frame rate is flexible, ranging from 15 fps to 60 fps. HDTV cinema cameras have adopted the film standard of 24 fps, but you can change their frame rate. |
| field | One-half of a complete scanning cycle, with two fields necessary for one television picture frame. In analog (NTSC) television, there are 60 fields, or 30 frames, per second. |
| digital television (DTV) | Digital systems that generally have a higher image resolution than standard television. Sometimes called advanced television (ATV). |
| progressive scanning | The consecutive scanning of lines from top to bottom. |
| sampling | Taking a number of samples (voltages) of the analog video or audio signal at equally spaced intervals. |
| scanning | The movement of the electron beam from left to right and from top to bottom on the television screen. |
| interlaced scanning | The scanning of all the odd-numbered lines (first field) and the subsequent scanning of all the even-numbered lines (second field). The two fields make up a complete television frame. |
| quantizing | A step in the digitization of an analog signal. It changes the sampling points into discrete numerical values (0’s and 1’s). |
| frame | A complete scanning cycle of the electron beam. In interlaced scanning, two partial scanning cycles (fields) are necessary for one frame. In progressive scanning, each scanning cycle produces one complete frame. |
| refresh rate | The number of complete scanning cycles per second. Also expressed in frames per second. |
| binary digit | the smallest amount of information a computer can hold and process. The charge is either on or off. |
| pixel | smallest element of a digital picture put together like a mosaic tile or matrix |
| variable scanning systems | the frame rate of the camera can be adjusted allows for smooth accelerated or slow-motion effects. |
| LCD Panels | Liquid crystal molecules change when a signal is applied to allow the back light to shine through |
| Plasma Panels | Thin layer of gas between 2 glass panels which varying charges activates tiny RGB dots |
