horizontal scanning

horizontal scanning

[‚här·ə′zänt·əl ′skan·iŋ]
(engineering)
In radar scanning, rotating the antenna in azimuth around the horizon or in a sector. Also known as searching lighting.

Horizontal Scanning

 

the scanning of a television image with an electron beam on the target of a transmitting television camera or the screen of a receiving tube in a horizontal direction to form distinct television scanning lines. The set of lines forms the television raster.

The total, or nominal, number of lines z in one frame is determined by the parameters of the given television system. The movement, usually linear, of the electron beam across the target or screen from left to right relative to the object whose image is being transmitted or to the viewer is called the forward trace; movement in the opposite direction is called the retrace. The electron beam is extinguished during the retrace, which occupies approximately 18 percent of the line time. Because some of the lines in each frame coincide with the vertical retrace, the actual number of lines is 0.92z.

The frequency of scanning (line frequency) fs is related to the frame frequency n by the formula fs = nz. For example, where n = 25 hertz and z = 625 (the standard figure for USSR television broadcasting), fs = 15,625 hertz. Horizontal scanning generators are used to effect the scanning.

N. G. DERIUGIN

horizontal scanning

horizontal scanning
In radar scanning, rotating the antenna in the azimuth around the horizon or in a sector. Also called search lighting.
References in periodicals archive ?
Purchase a screening device with horizontal scanning capabilities.
Experiments were performed on water, cement pastes, and mortars to determine the variability and uncertainty in counts as a result of changing various machine settings including the integration time, x-ray source intensity, and collimator size, and as a result of changing averaging procedures including the number of scanning repetitions and horizontal scanning resolution (Fig.
27 mm aperture grille pitch, 30-96 kHz horizontal scanning range, and 130 MHz video clock frequency.
This flat screen CRT is capable of a horizontal scanning frequency up to 95kHz, producing flicker free resolutions up to 1,600 x 1,200 at 75Hz.
Picture quality can be further improved by manipulating the horizontal scanning lines on which the picture is produced.
With information capacity four to fivefold that of ordinary TV and horizon definition three-odd-fold that of ordinary analog TV, Digital TV not only supports the future Scanning Standard signal, but also supports certain horizontal scanning signal of cable TV, AV, DVD, Progressive DVD, computer, digital camera and digital video camera ,etc.
The new Diamond Plus 200 has a 30-108 kHz horizontal scanning range, a high-performance 240 MHz video clock frequency and a maximum non-interlaced addressable resolution of 1600x1200 at 85 Hz.
Several companies manufacture CRT-based projectors that achieve a maximum horizontal scanning frequency of 37Khz.
27 mm edge, variable aperture grille pitch, 30-121 kHz horizontal scanning range, and 240 MHz video clock frequency.
A compact, horizontal scanning solution for medium to high-volume POS applications, the Magellan 2300HS "smart" scanner is the highest performing scanner in its class.
25 mm aperture grille pitch, 30-95 kHz horizontal scanning range, and 150 MHz video clock frequency.
The projector's variable-scanning capability has now been refined further to cover a horizontal scanning frequency ranging up to 105 kHz, making the projector ready for almost any input signal including UXGA.