A device that renders divergent or convergent rays more nearly parallel.
Note: The degree of collimation (parallelism) should be stated.

An array of dipole antennas mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array.
Note: A collinear array is usually mounted vertically, in order to increase overall gain and directivity in the horizontal direction. When stacking dipole antennas… (Read More →)

1. In a data transmission system, the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant.
2. In a computer, the situation that occurs when an attempt is made to store simultaneously two different data items at a given address that can hold only one of the… (Read More →)

In color television technology, a calibration process involving adjustment of the relative amplitudes of the signal levels representing the tristimulus colors to (a) achieve a camera output signal or (b) monitor display such that the resulting additive mixture of the excited phosphors accurately creates the perception of white.

The color bar test signal shown in the associated figure, consists of discrete steps of chroma and luminance levels that produce eight different colors superimposed upon standard synchronizing and blanking signals. [T
1. Rpt16-1992]

1. In color television technology, any of several electronically generated video test patterns displayed as vertical bars of usually equal width, and of specified color (e.g., 6 hues, plus gray and black) and intensity, used to establish or verify a proper color reference; e.g., prior to broadcasting or recording.
2. Loosely, the signal that produces color bars.

In analog color television technology, a signal consisting of several (8 to 10 in NTSC) cycles of unmodulated color subcarrier, superimposed at a specified location within the composite signal.
Note: The color burst (a) enables the color-decoding circuits in the receiver, and (b) serves as an amplitude, frequency, and phase reference to which the local color (subcarrier frequency) oscillator in… (Read More →)

Computation of the tristimulus values of colors in terms of one set of primaries.
Note: This computation may be performed electrically in a color television system. [IEEE] [After SMPTE]

In television and computer graphics, the electronic adjustment of a color reproduction process to improve the perceived-color conformity of the reproduction to the original. [After IEEE 100] [After SMPTE]

In color television technology, of a receiver, the circuitry that separates the chroma information from the video (gray-scale) information and processes the former into its constituent signal components.