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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) A standard, single-ended (unbalanced) interconnection scheme for serial data communications. b) Computer communication standard used in video for the control of certain video equipment. Computer controlled VCRs, edit controllers, switchers, and other studio equipment can commonly be found in professional video studios. Successfully linking two devices, at the very least, requires that they use the same communication protocol.
Industry:Software
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 colour than for brightness. Rather than conveying RGB, it is advantageous to convey luma in one channel, and colour information that has had luma removed in the two other channels. In an analogue system, the two colour channels can have less bandwidth, typically one-third that of luma. In a digital system each of the two colour 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 colour 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 colour 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 analogue systems. The colour spaces YPbPr, YCbCr, PhotoYCC, and YUV are simply scaled versions of Y, B-Y, R-Y that place the extreme of the colour 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
