How does DVB (Digital Television) allow several channels through one frequency?

A DVB-T (or ATSC in the US) transmission sends digital data in an MPEG transport stream. This stream of data (demodulated from a single RF channel) contains many sub-streams multiplexed together. The stream includes control blocks that identify the various sub-streams and allow them to be broken out (demultiplexed) by the receiver.

One transport stream can carry multiple digital channels (listed in a Program Association Table), and each digital channel will contain a video stream, one or more audio streams, subtitles, program guide information, etc. more.

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