Digital terrestrial television

Digital terrestrial television delivers television signals as digital data from ground-based transmitters to receiving antennas. It uses radio-frequency channels shared with other terrestrial broadcast services.

Digital video broadcasting: A family of standards for transmitting digital television and radio over satellite, cable, and terrestrial networks. Its terrestrial branch supplies the standards used to encode and transmit these broadcasts.
Radio spectrum: The range of electromagnetic frequencies used for communication and other applications. Terrestrial television occupies assigned portions of this spectrum.
Analog television: Television that represents picture and sound information through continuously varying signal properties. Digital terrestrial services replaced or coexist with analog broadcasts on terrestrial networks.
DVB-T: The Digital Video Broadcasting standard for terrestrial digital television transmission. It is a widely deployed European-origin standard for terrestrial digital broadcasts.
MPEG transport stream: A container format that multiplexes compressed audio, video, and signaling data into packets for transmission. Broadcast services are combined into transport streams before modulation onto radio channels.
Digital signal: A signal represented by discrete values rather than continuously varying quantities. Digital encoding distinguishes this system from analog terrestrial television.
Satellite television: Television delivered from satellites to receiving dishes or other compatible antennas. Satellite delivery uses space-based relays rather than ground transmitters.
DVB-T2: A second-generation DVB standard for terrestrial digital television, offering improved transmission efficiency over DVB-T. It increases capacity or robustness for terrestrial services using compatible networks and receivers.
Orthogonal frequency-division multiplexing: A modulation method that transmits data across many closely spaced, mutually orthogonal subcarriers. Many terrestrial systems use OFDM to handle echoes and multipath in broadcast channels.
Video compression: The reduction of video data size by removing or representing information more efficiently. Compression allows multiple program streams to fit within limited broadcast capacity.

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