- المجال:
- 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.
Copies of videotape with “burnt in” time-code display.
Hours, minutes, seconds, and frames appear on the recorded image.
Industry:Software
One of the three types of digital pictures in an MPEG data stream. A picture that is coded using motion compensated prediction from past reference pictures. The motion compensation is causal, that is, only based on preceding pictures, which can be I-pictures or P-pictures. This type of picture generally has more data than B-picture types.
Industry:Software
a) In a digital video system, the sampling is quincunx if the luminance and color-difference samples are generated from pixels arranged on one of two congruent rectilinear grids, the one being displaced horizontally from the other by half the horizontal pixel spacing.
The alternate grid is usually chosen for alternate lines, but may instead be chosen for alternate field/frames. b) In a digital video system, a sampling structure with an array of samples wherein alternate rows of pixel samples are displaced horizontally in the grid by half of the pitch of the pixel samples along the remaining rows.
Industry:Software
Signal that has been sampled at a lower rate than some other signal in the system. A good example of this is the Y'CbCr color space used in component serial video (ITU-R BT.601). For every two luma (Y') samples, only one Cb and Cr sample is taken causing the Cb and Cr signals to be subsampled.
Industry:Software
Hardware that you add to the basic hardware that increases performance, such as additional memory (SIMMs) or faster graphics boards.
Industry:Software
The process by which acicular particles are rotated so that their longest dimensions tend to lie parallel to one another.
Orientation takes place in magnetic tape by a combination of the sheer force applied during the coating process and the application of a magnetic field to the coating while it is still fluid. Particle orientation increases the residual flux density and hence the output of a tape and improves performance in several other ways.
Industry:Software
a) Technically, the process of converting from one sample rate to another. The digital sample rate for the component format is 13.5 MHz; for the composite format it is either 14.3 MHz for NTSC or 17.7 MHz for PAL. b) Often used incorrectly to indicate both resampling of digital rates and encoding/decoding.
Industry:Software
All ferromagnetic materials are composed of permanently magnetized regions in which the magnetic moments of the atoms are ordered. These domains have a size determined by energy consideration.
When a particle is small enough, it cannot support more than one domain and is called a single-domain particle.
Industry:Software
The sound pressure level at which people feel actual pain 50% of the time. Approximately 140 dB SPL at 1 kHz.
Industry:Software
All analog windowing architectures multiplex graphics and video as analog signals rather than as digital information, but they vary widely in signal manipulation and digital processing capabilities. While they do offer some advantages, analog architectures fail to address certain problems. For example, the graphics pixel-clock frequency becomes the pixel clock for the video image. Therefore, the greater screen resolution, the smaller the video window. Since enlarging the image means losing graphics resolution, the end user may find himself changing display drivers several times a day to fit the immediate task. The simplest analog architecture is the genlocked video overlay. Composite video is decoded into its RGB components. Having no control over the video source, the graphics controller must be genlocked to the video source, operating at a resolution and timing characteristic compatible with the incoming video signal. The graphics signal is switched in and out at appropriate times so that the graphic appears in the desired place in the image. The multiplexed output is then encoded into a new composite signal. The analog multiplexer, currently the most popular architecture, is actually a group of slightly varied architectures. The most popular variation imports the graphics data and pixel clock from the graphics card feature connector across a ribbon cable, where it is fed to a DAC.
The video signal is digitized, color-converted, and scaled, then is stored in a frame buffer similar to a FIFO which synchronizes the data. When the video data emerges from the frame buffer, it is fed to a second DAC. The two DACs are connected to an analog multiplexer that is controlled by a set of counters that keep track of the beam position on the graphics display.
When the beam enters the video-window area, the mux is switched from the graphics signal to the video signal.
Industry:Software
