Television Broadcasting, Technology Of - Research Article from Encyclopedia of Communication and Information

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Cameras and Accessories

Central to television is the use of cameras, which provide most of the visual elements that the audience sees. Basically, the camera is the visual acquisition tool that uses a lens to project an image (technically, the light reflected from the subject) onto the camera's pickup element, either an electron tube or a solid-state imager. The tube encodes the image into thousands of dots, and then an electron gun "reads" the dots and outputs the signal. Most cameras have replaced the tube system with a "chip" system (solid-state imager) that uses one or several charge-coupled devices (CCDs), which are smaller, more durable, and use less power than tubes.

Camera operators can control various elements of the image through lens selection and camera features. For example, electronic shutter speed can vary, video signals can be amplified through gain control, the aperture can be opened...

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This section contains 2,646 words
(approx. 9 pages at 300 words per page)
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Television Broadcasting, Technology Of from Encyclopedia of Communication and Information. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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