A subcarrier is a separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. More technically, it is an already-modulated signal, which is then modulated into another signal of higher frequency and bandwidth. This is an early and simple method of multiplexing.
Read more about Subcarrier: FM Stereo, Television, Private Audio, Datacasting, Telemetry and Foldback, MCPC Satellites
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