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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 medium range (typically up to 300 m/1000 ft or more) balanced serial data transmission standard. Data is sent using an ECL signal on two twisted pairs for bidirectional operation. Full specification includes 9-way D-type connectors and optional additional signal lines. RS-422 is widely used for control links around production and post areas for a range of equipment.
Industry:Software
The human visual system has much less acuity for spatial variation of color than for brightness. Rather than conveying RGB, it is advantageous to convey luma in one channel, and color information that has had luma removed in the two other channels. In an analog system, the two color channels can have less bandwidth, typically one-third that of luma. In a digital system each of the two color channels can have considerably less data rate (or data capacity) than luma. Green dominates the luma channel; about 59% of the luma signal comprises green information. Therefore, it is sensible, and advantageous for signal-to-noise reasons, to base the two color channels on blue and red. The simplest way to remove luma from each of these is to subtract it from the difference between a primary color and luma. Hence, the basic video color-difference pair is B-Y, R-Y (pronounced “B minus Y, R minus Y”). The B-Y signal reaches its extreme values at blue (R = 0, G = 0, B = 1; Y = 0.114; B-Y = +0.886) and at yellow (R = 1, G = 1, B = 0; Y = 0.886; B-Y = –0.886). Similarly, the extreme of R-Y, ±0.701, occur at red and cyan. These are inconvenient values for both digital and analog systems. The color spaces YPbPr, YCbCr, PhotoYCC, and YUV are simply scaled versions of Y, B-Y, R-Y that place the extreme of the color difference channels at more convenient values. The R-Y signal drives the vertical axis of the vectorscope.
Industry:Software
Short for oscilloscope (waveform monitor) or vectorscope, devices used to measure the television signal.
Industry:Software
A number from one to seven that uniquely identifies a SCSI device to a system. No two SCSI devices that are physically connected to the same workstation can have the same SCSI address.
Industry:Software
A small plastic dial connected to every SCSI device supplied by Silicon Graphics, Inc. You click on its small buttons to select a SCSI address for a new SCSI device. Each device on a SCSI bus normally should have a unique address.
Industry:Software
The combined length of all internal and external SCSI cables in a system.
Industry:Software
A hardware device that uses the SCSI protocol to communicate with the system. Hard disk, floppy disk, CD-ROM, and tape drives may be SCSI devices.
Industry:Software
A metal cap that you plug into any open SCSI port on a SCSI bus line. No SCSI devices on a SCSI bus line will work unless all SCSI ports are occupied by either a cable or terminator.
Industry:Software
