Analog television

A television system that transmits picture and sound as continuously varying analog signals rather than digitally encoded data. Its image is organized into scanning lines and synchronized with the receiver.

Raster scan: A method of displaying an image by tracing successive horizontal lines across a screen. Analog television builds each picture from lines scanned in a fixed sequence.
Cathode-ray tube: A vacuum tube that forms images by steering an electron beam across a phosphor-coated screen. It was the standard display technology for analog television receivers.
John Logie Baird: A Scottish inventor who demonstrated early television systems using mechanical scanning. His public demonstrations helped establish television as a practical medium before electronic systems prevailed.
Digital television: A television system that represents and transmits picture and sound as digitally encoded data. It replaces continuously varying broadcast signals with encoded data streams.
Broadcasting: The one-to-many transmission of audio or video programs to a dispersed audience. Analog television became a major form of broadcast communication.
Composite video: An analog video signal that combines picture information with synchronization pulses, and often color information. It carries the image and timing information in a single signal.
Television camera tube: An electronic image sensor that converts a scene's light into a video signal. Early analog broadcasts began with camera tubes translating light into changing electrical values.
Philo Farnsworth: An American inventor who developed an all-electronic television system and demonstrated it in 1927. His image dissector and electronic scanning helped shape television's eventual technical design.
Digital terrestrial television: Digital television broadcast over terrestrial radio transmitters to receiving antennas. It took over many over-the-air services previously carried by analog transmitters.
Television advertisement: A paid audiovisual message transmitted as part of television programming. Analog television made synchronized sound and moving images available to mass-market advertising.

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