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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 MAC standard proposed for studio intraconnection by the SMPTE working group on CAV standards. The S-MAC system uses time compression and time-domain multiplexing techniques to convey (Y, CR, CB) video signals - a version of (Y, R-Y, B-Y). b) A MAC designed for single transmission of CAV signals in a television facility or between facilities. See also MAC.
Industry:Software
A technique used in many ATV schemes (including all of the MACs) for squeezing a signal of a certain duration into a time period of lesser duration. This effectively multiplies the bandwidth of the original signal by the compression factor. If the higher bandwidth is not available, horizontal resolution is lost. Time compression is most frequently used for colour components (which can often afford the resolution loss due to restricted visual acuity) and for widescreen panels (with the resolution loss made up via some sub-channel).
Industry:Software
For a definition of “TV” column codes.
See Terrestrial Transmission Standards.
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Industry:Software
A) The time at which a presentation unit is to be available to the viewer. When the packet should arrive and its destination. b) Time stamp for vision and sound integrated into PES, transmitted at least every 0.7 sec.
Industry:Software
A term sometimes used to describe a number of scanning lines per frame, interlace ratio, and frame rate; also sometimes used to describe what appears when scanning lines are visible.
Industry:Software
Line rate and field rate sweep signals can be used to measure the frequency response of a system. In a sweep signal, the frequency of the waveform is continuously increased over the length of the line or field. A sweep signal allows you to examine the frequency response continuously over the interval of interest rather then at only discrete frequency intervals as tested by the multiburst or multiphase signals. The Sweep signal however cannot be used for VITS, thus is limited to out-ofservice testing. See the Frequency Response discussion.
Industry:Software
A) That part of the video signal where the voltage level is at 0 IRE and the electron beam sweeps back from the bottom to the top of the screen. b) A period during which the electron beam in a display is blanked out while it travels from the bottom of the screen to the top. It is the black bar that becomes visible when the vertical hold on a television set is not correctly adjusted. The VBI is usually measured in scanning lines. When the VBI is subtracted from the total number of scanning lines, the result is the number of active scanning lines. In NTSC, the VBI has a duration of 20.5 or 21 lines (depending on the field), of which nine lines are devoted to the vertical synchronising signal that lets television sets know when a field has been completed. The remaining lines have long been used to carry auxiliary information, such as test and reference signals, time code, and encoded text, such as captions for the hearing impaired. Some ATV schemes propose expanding the VBI to accommodate widescreen images by the letterbox technique; some propose using it as a sub-channel for additional picture information. See also Blanking.
Industry:Software
A) Special type of disc drive designed for moving very large amounts of information as quickly as possible.
b) A very widely used high data rate general purpose parallel interface.
A maximum of eight devices can be connected to one bus, for example a controller, and up to seven discs or devices of different sorts - Winchester disks, optical disks, tape drives, etc., and may be shared between several computers. SCSI specifies a cabling standard (50-way), a protocol for sending and receiving commands and their format. It is intended as a device-independent interface so the host computer needs no details about the peripherals it controls. But with two versions (single-ended and balanced), two types of connectors and numerous variations in the level of implementation of the interface, SCSI devices cannot “plug & play” on a computer with which they have not been tested. Also, with total bus cabling for the popular single-ended configuration limited to 18 feet (6 meters), all devices must be close to each other.
Industry:Software
The management of multiple signals by transmitting or receiving each on its own assigned frequency.
Industry:Software
