- المجال:
- Number of terms: 20560
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- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
a) The effect of a spotlight falling on a video scene, and the switcher feature that allows this to be accomplished. On the AVC, the spotlight control adjusts attenuation of the A bus video. A typical spotlight effect is obtained by selecting the same source on both buses, a soft bordered circle wipe, and using size and position control. Many other effects are also possible with this feature. b) A highlight effect produced by a fullstrength video signal shaped by a wipe pattern and an attenuated (darkened) signal from the same video source. This is activated by selecting spotlight on the M/E effects group of buttons, and adjusting spotlight control on the pattern adjust group of controls to darken the desired area.
Industry:Software
A standard to be used for transmitting signals to the home, not necessarily for producing them. The scanning structure of NTSC is identical for both production and transmission, but this need not be the case in ATV schemes. For example, an HDEP standard of 1125 scanning lines might be used with a transmission standard of 1050 lines.
Standards converters translate one standard into another.
Industry:Software
The model is similar in structure to that of SNA. It consists of seven architectural layers: the physical layer and data link layer, the network layer; the transport layer; the session layer; the presentation layer; the application layer.
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Industry:Software
When a database is visualized, it is “projected” from 3D into 2D (the screen). Two kinds of projection are used, projection and orthogonal.
Industry:Software
SI provides information on services and events carried by different multiplexes, and even other networks. SI is structured as six tables (PAT, NIT, CAT, SDT, EIT, and BAT). The applications are only concerned with NIT, BAT, SDT, and EIT.
Industry:Software
A file format (tagged image format file) preferred over the bitmap (BMP) file format for Windows applications. TIF files may be compressed or uncompressed and contain a header similar to BMP files. A special version of TIF is used for compressed data FAX transmission.
Industry:Software
A large array of several monitors, placed close to each other in the shape of a video screen or “wall.” Each monitor is fed only part of the original video image by using a video-wall generating unit. This device is a digitally-based processor which converts the original analog video signal to digital, rescans, resamples, and generates several individual analog video outputs for driving each array monitor separately. When viewed from a distance, the effect can be very dramatic.
Industry:Software
That portion of the composite video signal which lies above the blanking level and contains the picture information.
Industry:Software
a) Qualitatively: Capacity for seeing distinctly fine details that have a very small angular separation.
b) Quantitatively: Any of a number of measures of spatial discrimination such as the reciprocal of the value of the angular separation in minutes of arc of two neighboring objects (points or lines or other specified stimuli) which the observer can just perceive to be separate. c) In system design, the reference value for normal human visual limiting resolution is 30 cycles/degree, i.e., 60 TV lines per angular degree subtended at the viewing position. For systems of current interest, the maximum viewing distances for discrete vertical resolution of the number of lines presented are shown in the following table.
Limiting Resolution of Vertical Detail (1) TV Per Subtended Maximum Line Frame Vertical Viewing Total Active Angle Distance (1) (2) 525 485 8.08" 7.1h (3) = 5.3w (4) 625 575 9.58" 6.0h = 4.5w (4) 1125 1035 17.25" 3.3h = 1.9W (5) (1) No adjustment has been applied for possible interlace or Kell effects.
(2) Assumes a shadow mask, if present, is not limiting.
(3) h is vertical height of display.
(4) w is horizontal width of display for 4:3 aspect ratio.
(5) W is horizontal width of display for 16:9 aspect ratio.
Industry:Software
In MPEG-4, static background scenes. Sprites can have dimensions much larger than what will be seen in any single frame. A coordinate system is provided to position objects in relation to each other and the sprites. MPEG-4’s scene description capabilities are built on concepts used previously by the Internet community’s Virtual Reality Modeling Language (VRML).
Industry:Software
