- المجال:
- 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.
The signal-to-weighted noise ratio is the ratio in decibels, of the nominal amplitude of the luminance signal (100 IRE units) to the RMS amplitude of the noise measured at the receiving end after band limiting and weighting with a specified network. The measurement should be made with an instrument having, in terms of power, a time constant or integrating time of 0.4 seconds.
Industry:Software
Logic device whose output can be placed into a highimpedance (off) state, in addition to the usual high and low states. This feature allows more than one device output to be connected to the same logic node. Three-state operation is a fundamental requirement for devices used on microprocessor data buses. Same as Tri-State (registered trademark).
Industry:Software
The way in which tape is wound onto a reel. An A-wind is one in which the tape is wound so that the coated surface faces toward the hub; a B-wind is one in which the coated surface faces away from the hub. A uniform wind, as opposed to an uneven wind, is one giving a flat-sided tape pack free from laterally displaced, protruding layers.
Industry:Software
To turn on the power switches on the workstation chassis and the monitor.
Industry:Software
a) Process where analog signals are measured, often millions of times per second for video, in order to convert the analog signal to digital.
The official sampling standard definition for television is ITU-R 601. For TV pictures 8 or 10 bits are normally used; for sound, 16 or 20 bits are common, and 24 bits are being introduced. The ITU-R 601 standard defines the sampling of video components based on 13.5 MHz, and AES/EBU defines sampling of 44.1 and 48 kHz for audio. b) The process of dealing with something continuous in discrete sections. Sampling is probably best known as the first step in the process of digitization, wherein an analog (continuous) signal is divided into discrete moments in time. Yet, even analog television signals have already been sampled twice; once temporally (time being sampled in discrete frames) and once vertically (the vertical direction being divided into discrete scanning lines). If these initial sampling processes are not appropriately filtered (and they rarely are in television), they can lead to aliases. See also Alias, Digitization, and Nyquist.
Industry:Software
Captions, subtitles, or other text that can be displayed or hidden.
Industry:Software
When used to describe television test signals, this term refers to pulses and pedestals which do not have high-frequency chrominance information added to them.
Industry:Software
a) An extra bit appended to a character as an accuracy check.
For example, if parity is even, the sum of all 1s in the character should be even. b) Number of 1s in a word, which may be even or odd. When parity is used, an extra bit is used to force the number of 1s in the word (including the parity bit) to be even (even parity) or odd (odd parity). Parity is one of the simplest error detection techniques and will detect a single-bit failure.
Industry:Software
Digitizing technique whereby the contouring effects of digital video are minimized by adding a small amount of random noise to the signal. Also see Dithering.
Industry:Software
