Electronic system for transmitting still or moving images and sound to receivers that project a view of the images on a picture tube or screen and recreate the sound. Early versions (1900–20) of the cathode-ray (picture) tube, methods of amplifying an electronic signal, and theoretical formulation of the electronic scanning principle later became the basis of modern TV. RCA demonstrated the first all-electronic TV in 1932. Cable TV systems (introduced in the late 1940s), colour TV (in the 1950s), and recording or playback machines (in the 1980s; see VCR) followed. Digital high-definition (HDTV) systems (1990s) provide sharper, clearer pictures and sound with little interference or other imperfections and have the potential to merge TV functions with those of computers.
This entry comes from Encyclopædia Britannica Concise.
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