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.
The new Diamond Pro 2040u has a 30-121 kHz horizontal scanning range, and 240 MHz video clock frequency.
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Second, the F520 offers an increased horizontal scanning frequency at a maximum of 96 kHz (FX-C5S: 82 KHz).
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The scanner has been tested at horizontal scanning speeds greater than 19,000 cycles per second.
Variable scanning frequency capability with horizontal scanning frequencies ranging from 15 kHz to 82 kHz assures compatibility with a wide range of source signals.
25 mm aperture grille pitch, 30-69 kHz horizontal scanning range, and 100 MHz video clock frequency.