Video Signal

video signal

[′vid·ē·ō ‚sig·nəl]
In television, the signal containing all of the visual information together with blanking and synchronizing pulses.

Video Signal


an electrical signal designed to produce an image. A video signal is formed by photoelectric converters (a superorthicon or vidicon in television or a photoelectric cell or photomultiplier in picture transmission) or by the detection of electromagnetic waves received by a radar set.

In television the instantaneous values of the video signal at the output of the television camera tube are proportional to the brightness of individual parts of the optical image on its light-sensitive surface. The possible peak-to-peak values of a video signal in black-and-white and color television are limited by the levels of the black, which is the reference level (when the video signal is zero), and the white (the maximum value of the video signal). For television braodcasting systems the lowest frequency of the television signal spectrum is equal to the frame frequency (50-60 Hz), and the highest is the greatest frequency of the change in brightness of the transmitted image along a line (6-6.5 MHz). In picture trans-mission a light spot passes sequentially over a fixed image. The rays reflected from the latter impinge on a photoelectric converter, thus creating video signals. The highest frequency in the video-signal spectrum is a function of the rate at which the image is scanned and varies over a wide range (80 Hz to 6 kHz). The video signal in radar is in the form of pulses. The lowest video-signal frequency of the spectrum is equal to the repetition rate of the radiated pulses (50-400 Hz) and the highest is practically inversely proportional to the duration of the radiated pulse (1-10 MHz).


echo signal

The radar energy returned to a radar by a target. The amount of this energy is called received power. Also called a video signal or a target signal.

target signal

The radar energy returned to a radar by a target. Also called an echo signal or a video signal. The amount of this energy is called received power. The size of the echo on the PPI (plan position indicator) is a direct function of the received power. See echo.
References in periodicals archive ?
Recently added to the Vitex product line, the PBTS is designed for long distance video signal transmission.
introduced today an ultra-high-definition (UHD) video signal processor that is able to upscale and downscale between SD (480i), ED (480p), HD (720p, 1080i and 1080p), and UHD (2160p) video formats.
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An integrated video filter driver provides reconstruction filtering that eliminates undesired noise on a video signal.
They can modify a video signal to compensate for distance, accommodating up to 4,000 feet in full motion color/black-and-white or 750 feet with pan-tilt-zoom signals.
A plurality of laser diodes extending along a line near one edge of the first plate are selectively illuminated at an intensity corresponding to the amplitude of a video signal during each of a plurality of video lines.
Succeeds in Including Digital Video Signal Processing Functions for LCD Monitors in a Single Chip -
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One of coax's big advantages is the shielded ground which helps to prevent noise from interfering with the video signal.
TOKYO:6703) today announced it has started shipment of samples of its video decoder LSI that are compliant with three of the world's video signal standards, NTSC, PAL and SECAM(*1).
As a cameraman records a marine biologist conducting onboard research vessel demonstrations, the VBrick appliance feeds the live, compressed video signal to an onboard radio transmitter that includes omni-directional antennas.