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Reference.org
Subcarrier
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<p>A subcarrier is a <a href="/facts/Sideband/6ynIVBFk">sideband</a> of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast. There is no physical difference between a carrier and a subcarrier; the "sub" implies that it has been derived from a carrier, which has been amplitude modulated by a steady signal and has a constant frequency relation to it. </p>