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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 block of digital memory capable of buffering a frame of video. The amount of memory required for a frame buffer is based on the video being stored. For example to store a 640 X 480 image using the RGB colour space with eight bits per color, the amount of memory required would be: 640 x 480 x 3 = 921,600 bytes. b) A frame buffer is a digital frame store, containing a large chunk of memory dedicated to pixel memory, at least one complete frame’s worth. All the pixels in the buffer have the same depth. Each bit of depth is called a bit plane. Frame buffers can use the bit planes in a variety of ways. First, a pixel’s bits can store the RGB values of colors. This simple method is called full-color mode. In full-color mode, it is common to refer to the red plane, or the blue or green plane, meaning the bits reserved for specifying the RGB components of the pixel.
Full-color systems may also have an alpha channel, which encodes the transparency of each bit. The alpha channel is like a matte or key of the image. Alternately, the bits can store a colour number, which selects the final colour from a colour map. Finally, some bit planes may be reserved for use as overlay planes.
Industry:Entertainment
Taking one frame of video and storing it on a hard drive for use in various video effects.
Industry:Entertainment
DCT coding in which every block consists of lines from both fields which are interlaced. The chrominance blocks in the 4:2:0 format always have to be coded by using frame DCT coding.
Industry:Entertainment
The rate at which a complete frame is scanned, nominally 30 frames per second.
Industry:Entertainment
A picture in which the two fields in a frame are merged (interlaced) into one picture which is then coded.
Industry:Entertainment
A) The rate at which frames of video data are scanned on the screen. In an (M) NTSC system, the frame rate is 29.97 frames per second. For (B, D, G, H, I) PAL, the frame rate is 25 frames per second.
b) The number of frames per second at which a video clip is displayed.
c) The rate at which frames are output from a video decoding device or stored in memory. The NTSC frame rate is 30 frames/second while some graphics frame rates are as high as 100 frames/second.
Industry:Entertainment
The process of converting one frame rate to another. Examples include converting the (M) NTSC frame of 29.97 frames per second to the PAL frame rate of 25 frames per second.
Industry:Entertainment
A network interface protocol defined by CCITT Recommendation I.122 as a packet mode service. In effect it combines the statistical multiplexing and port sharing of X.25 packed switching with the high speed and low delay of time division multiplexing and circuit switching.
Unlike X.25, frame relay implements no layer 3 protocols and only the so-called core layer 2 functions. It is a high-speed switching technology that achieves ten times the packet throughput of existing X.25 networks by eliminating two-thirds of the X.25 protocol complexity. The basic units of information transferred are variable-length frames, using only two bytes for header information. Delay for frame relay is lower than X.25, but it is variable and larger than that experienced in circuit-switched networks.
Industry:Entertainment
Term used for a digital full-frame temporary storage device with memory for only one frame of video.
Industry:Entertainment
A digital buffer, that by storage, comparison of sync information to a reference, and time release of video signals, can continuously adjust the signal for any timing errors. A digital electronic device which synchronises two or more video signals. The frame synchronizer uses one of its inputs as a reference and genlocks the other video signals to the reference’s sync and colour burst signals. By delaying the other signals so that each line and field starts at the same time, two or more video images can be blended, wiped, and otherwise processed together. A TBC (Time Base Controller) takes this a step further by synchronising both signals to a stable reference, eliminating time-base errors from both sources. The Digital Video Mixer includes a frame synchronizer and dual TBCs.
Industry:Entertainment
