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- Number of terms: 20560
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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
A random sequence of bits which repeat after 2^n - 1
Industry:Software
A) In NTSC systems, video black is typically 7.5 IRE above the blanking level. This 7.5 IRE level is referred to as the black setup level, or simply setup. b) The ratio between reference black level and reference white level, both measured from blanking level. It is usually measured in percent. Black level reference expressed as a percentage of the blanking to-reference-white excursion. Conventionally 7.50% in system M, conforming to ANSI/EIA/TIA 250-C. Conventionally zero in all other systems where blanking level and black level reference are identical.
Industry:Software
A signal lamp or LED installed on a video camera which informs performers and crew members that the camera is currently live.
Industry:Software
Two-way interactive service that uses either two-way cable or telephone lines to connect a central computer to a television screen.
Industry:Software
A cathode-ray tube used to produce an image by variation of the intensity of a scanning beam.
Industry:Software
Classically, two point objects are considered resolved when the centres of their diffraction discs in the image are separated by at least one disc diameter. This leads to a theoretical minimum angular separation for objects at a distance: a = (1.22)(lambda)/D. Resolving power of a lens increases with increasing optical aperture. Systems vary enormously in the closeness with which their actual resolving power approaches this diffraction-controlled ultimate limit.
Industry:Software
Pixels generated in a television system having the same horizontal and vertical resolution. There is some evidence that a large mismatch between horizontal and vertical resolution prevents the higher resolution from being fully perceived by the human visual system. NTSC was created with square pixels with a resolution of approximately 330 by 330 lines.
Industry:Software
In the transparency technique first-frame analysis, the first frame of the video file. It contains no video data, but merely supplies the colour or range of colours to be rendered as transparent. See First-Frame Analysis, Transparency.
Industry:Software
Bits added to the binary message for the purpose of facilitating the transmission and recovery of the message (e.g., frame synchronisation words, cheque bits, etc.)
Industry:Software
Certain systems described in these standards employ feedback shift registers to modify sequences or patterns of bits in a predetermined manner or to restore such modified bit patterns to their original sequence. With outputs of suitably selected stages added modulo-2 and applied to its feedback loop, an n-stage feedback shift register will generate a bit sequence or pattern (2^n - 1) bits long before repeating. Because such repeating sequences exhibit many of the statistical properties of uniformly distributed random number sequences (e.g., their probability density and autocorrelation functions satisfy appropriate conditions),they are called pseudo-random.
Industry:Software
