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- Number of terms: 20560
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- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
SI provides information on services and events carried by different multiplexes, and even other networks. SI is structured as six tables (PAT, NIT, CAT, SDT, EIT, and BAT). The applications are only concerned with NIT, BAT, SDT, and EIT.
Industry:Software
A way of winding tape such that the end of the selection is at the outside of the reel.
Industry:Software
The electric signal that represents complete colour picture information and all sync signals. Includes blanking and the deflection sync signals to which the colour sync signal is added in the proper time relationship.
Industry:Software
In a scanning standard, the number of raster lines that contain the vertical extent of a white flatfield between the 50% response points, top and bottom.
Industry:Software
A term to describe equipment that can work in more than one resolution. Dedicated TV equipment is designed to operate at a single resolution although some modern equipment, especially that using the ITU-R 601 standard, can switch between the specific formats and aspect ratios of 525/60 and 625/50. By their nature, computers can handle files of any size, so when applied to imaging, they are termed resolution independent. As the images get bigger, so the amount of processing, storage, and data transfer demanded increases in proportion to the resulting file size. So, for a given platform, the speed of operation slows. Other considerations when changing image resolution may be reformatting disks, checking if the RAM is sufficient to handle the required size of file, allowing extra time for RAM/disk caching, and how to show the picture on an appropriate display.
Industry:Software
Video scrambling technique, used with horizontal blanking inversion, active video inversion, or both. In split sync, the horizontal sync pulse is “split,” with the second half of the pulse at +100 IRE instead of the standard –40 IRE. Depending on the scrambling mode, either the entire horizontal blanking interval is inverted about the +30 IRE axis, the active video (after colour burst and until the beginning of front porch blanking) is inverted about the +30 IRE axis, both are inverted, or neither is inverted. By splitting the horizontal sync pulse, a reference of both –40 IRE and +100 IRE is available to the descrambler. Since a portion of the horizontal sync is still at –40 IRE, some sync separators may still lock on the shortened horizontal sync pulses. However, the timing circuits that look for colour burst a fixed interval after the beginning of horizontal sync may be confused. In addition, if the active video is inverted, some video information may fall below 0 IRE, possibly confusing sync detector circuits. The burst is always present at the correct frequency and timing, however, the phase is shifted 180 degrees when the horizontal blanking interval is inverted.
Industry:Software
The process for converting one colour difference signal format to another. See the discussion on Matrix.
Industry:Software
A type of key border effect. An outline key with a character generator appears as if the letters have been traced; the background video is visible all around the letter as well as inside it.
Industry:Software
The time it takes for a signal to travel through a circuit, piece of equipment, or a length of cable. When the luminance and colour information of a video signal are separated for processing, then reunited at the output of a device, it is critical that the propagation delay for each signal component is equal or distortion similar to ghosting will result. Propagation delay is most noticeable in color-under VHS players.
Propagation delay is also a problem when routing computer data and clock signals around a chip or circuit board. The faster the clock, the more critical the path delays.
Industry:Software
