Television broadcasting

Television broadcasting distributes audiovisual programs from centralized sources to multiple receivers through terrestrial transmitters, satellites, or cable networks.

Broadcast transmitter: Equipment that converts broadcast signals into radio-frequency energy and radiates it through an antenna. Terrestrial television stations use transmitters to send signals across their coverage areas.
Mechanical television: An early television system that used mechanical scanning to capture and reproduce moving images. Mechanical systems demonstrated broadcast television before electronic systems became dominant.
Television network: An organization that supplies or coordinates television programming across multiple stations or distribution systems. Networks assemble schedules and distribute programs to affiliated broadcasters.
Cable television: Television programming delivered to subscribers through coaxial or fiber-optic networks. Cable distributes programs over wired networks rather than relying on terrestrial over-the-air transmission.
Digital television: Television systems that encode images and sound as digital data for transmission and reception. Digital encoding lets broadcasters carry audiovisual programs and service information in a channel.
Electronic television: Television based on electronic image capture, signal processing, and display rather than mechanical scanning. Electronic television supplied the technical basis for modern broadcast services.
Broadcast programming: The selection, scheduling, and organization of programs for transmission to audiences. A broadcast service turns available content into a timed sequence of programs.
Satellite television: Television programming delivered from satellites to receiving dishes or distribution facilities. Satellite distribution reaches receivers through space-based links instead of local terrestrial transmitters.
Modulation: The process of varying a carrier signal to encode information for transmission. Television signals use modulation to carry encoded audiovisual information over radio-frequency channels.
John Logie Baird: Scottish inventor known for developing and demonstrating early mechanical television systems. Baird's demonstrations helped establish television as a medium for transmitting moving images.

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