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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.
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 synchronizes 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 color 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 synchronizing 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
Process of allowing a digital circuit (typically a microprocessor) to run without feedback (open-loop). This is done to stimulate other devices in the circuit in a recurring and predictable manner.
Industry:Entertainment
Special effect in which the picture is held as a still image. It is possible to freeze either one field or a whole frame. Freezing one field provides a more stable image if the subject is moving, however, the resolution of the video image is half that of a full frame freeze. Digital freeze frame is one special effect that could be created with a special effects generator or a TBC (Time Base Controller). The Digital Video Mixer includes this feature.
Industry:Entertainment
Three HDEP proposals, two closely related, suggested by a number of French organizations. For countries with a field rate of 50 fields per second, there would be 1200 scanning lines, 1150 of them active. For countries with a field rate of 59.94 fields per second, there would be 1001 scanning lines, 970 of them active. Both systems would have identical line rates (60,000 lines per second) and bandwidths (65 MHz luminance), and would be progressively scanned. This correspondence would allow a great deal of common equipment, as Recommendation 601 does for digital component video. The third proposal is for a worldwide standard based on 1050 scanning lines (970 active), 2:1 interlace, and 100 field per second.
Industry:Entertainment
The number of cycles a signal that occurs per second, measured in hertz (repetition rate). In electronics, almost invariably the number of times a signal changes from positive to negative (or vice versa) per second.
Only very simple signals (sine waves) have a single constant frequency; the concept of instantaneous frequency therefore applies to any transition, the frequency said to be the frequency that a sine wave making the same transition would have. Images have spatial frequencies, the number of transitions from dark to light (or vice versa) across an image, or per degree of visual field.
Industry:Entertainment
List of which frequencies can be used for transmission of different signals in the U.S. It may require revision for certain ATV (Advanced TV) schemes. A similar function is performed internationally by the International Frequency Registration Board (IFRB), like the CCIR, part of the International Telecommunications Union.
Industry:Entertainment
