- 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.
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
The process by which colour and brightness signals are combined in NTSC.
Industry:Entertainment
A) Modulation of sine wave or “carrier” by varying its frequency in accordance with amplitude variations of the modulating signal. b) Also referring to the North American audio service broadcast over 88 MHz to 108 MHz.
Industry:Entertainment
A) The range of frequencies which a piece of equipment can process. b) A system’s ability to uniformly transfer signal components of different frequencies without affecting their amplitudes. This parameter is also known as gain/frequency distortion or amplitude versus frequency response. The amplitude variation maybe expressed in dB, percent, or IRE. The reference amplitude (0 dB, 100%) is typically the white bar or some low frequency. Frequency response numbers are only meaningful if they contain three pieces of information: the measured amplitude, the frequency at which the measurement was made, and the reference frequency.
There are a number of test signals that can be used to evaluate frequency response. They include Multiburst, Multipulse, a swept signal, or (Sin X)/X.
Industry:Entertainment
The curve relating the variation in output with frequency of a piece of equipment or magnetic tape when the input is kept constant.
Industry:Entertainment
A distortion in a transmission system where the higher frequency components are not conveyed at their original full amplitude. In video systems, this causes loss of colour saturation.
Industry:Entertainment
