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Contents:
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index,
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Did you know?
In its early stages of development, television employed a combination of
optical, mechanical and electronic technologies to capture, transmit and display
a visual image. By the late 1920s, however, those employing only optical and
electronic technologies were being explored. All modern television systems rely
on the latter, although the knowledge gained from the work on
mechanical-dependent systems was crucial in the development of fully electronic
television.
American family watching TV, 1958 The first time images
were transmitted electrically were via early mechanical fax machines, including
the pantelegraph, developed in the late 1800s. The concept of
electrically-powered transmission of television images in motion, was first
sketched in 1878 as the telephonoscope, shortly after the invention of the
telephone. At the time, it was imagined by early science fiction authors, that
someday that light could be transmitted over wires, as sounds were.
The idea of using scanning to transmit images was put to actual practical use in
1881 in the pantelegraph, through the use of a pendulum-based scanning
mechanism. From this period forward, scanning in one form or another, has been
used in nearly every image transmission technology to date, including
television. This is the concept of "rasterization", the process of converting a
visual image into a stream of electrical pulses.
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