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Tektronix, Inc.
Industrie:
Number of terms: 20560
Number of blossaries: 0
Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
Hum caused by currents circulating through the ground side of a piece of equipment due to grounding different components at points of different voltage potential.
Industry:Software
An electrical wall outlet that accepts a plug that has a grounding prong. In the USA, all properly wired three-prong outlets provide a ground connection.
Industry:Software
A group is any arbitrary collection of polygons; a subset of the database, usually the group represents a coherent object. A group could contain all the polygons constituting the model of a chair, or it could contain twenty such chairs and a table. A polygon can only be in one group at a time, but it can move to another group.
Industry:Software
The ITU-T Group 1 to 4 specify compression of black and white documents and the operation of facsimile equipment. Group 3 (also known as G3 or T.4) is presently the most important standard in the world of fax and document storage applications. G3 compression features modified Huffman encoding. The ITU-T Group 4 (also known as G4 or T.6) is an improvement of ITU-T G3, dedicated to digital telephone lines, in particular ISDN.
Industry:Software
A) A signal defect caused by different frequencies having differing propagation delays. b) This distortion is present when signal components of different frequencies experience different delays as they pass through a system. Distortions are expressed in units of time. The largest difference in delay between a reference low frequency and the other frequencies tested is typically quoted as the group delay distortion. Group delay problems can cause a lack of vertical line sharpness due to luminance pulse ringing, overshoot, or undershoot. The Multipulse or (Sin x)/x signals can be used to cheque for group delay in the same way as these signals are used to cheque for chrominance to luminance delays.
Industry:Software
A) A GOP starts with an I-picture and ends with the last picture before the next I-picture. b) A picture sequence which can be coded as an entity. For instance, it is possible to cut between GOPs. For that reason, the first picture in a GOP has to be intra-coded (I-picture). Time codes are carried on GOP levels.
Industry:Software
Additional safety margin between two transmitting symbols in the COFDM standard. The guard interval ensures that reflections occurring in the single-frequency network are eliminated until the received symbol is processed.
Industry:Software
A modelling object visualised in the presence of another database which will serve as a visualisation support but cannot be modified.
Industry:Software
Part of the MPEG-2/DVB standard where half of the normal 720-pixel horizontal resolution is transmitted while maintaining normal vertical resolution of 480 pixels. Since it is a 4:2:0 format, the colour information is encoded at 240 pixels vertically and 176 pixels horizontally. Virtually all the DBS providers use HHR format since it dramatically reduces the bandwidth needed for channels, though at the expense of picture quality. Special logic in the video decoder chip in the set top box re-expands the picture to normal horizontal size by interpolation before display. 4:2:2 video at Standard Definition looks as good as the NBC analogue feeds on GE-1 Ku. High bandwidth 4:2:0 video such as the NBC digital feeds on GE-1 Ku come very close to studio quality and the low bandwidth video encoded in HHR format looks like DBS.
Industry:Software
Troubleshooting technique used for fault isolation. It involves the examination of circuit nodes approximately midway through a circuit. Once the operational state of these nodes has been determined, the source of the fault can be isolated to the circuits either before or after this point. This process can then be continued.
Industry:Software