Carrier Wave - MSN Encarta

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Carrier wave - Wikipedia, the free encyclopedia
In telecommunications, a carrier wave, or carrier is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information, [1 ...
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Carrier Wave, radio waves that can be used to carry modulated signals. Programme signals (audio, video, etc.) are impressed on the carrier by frequency modulation (FM) or amplitude modulation (AM).

The carrier wave is usually kept at a fixed frequency by the transmitter and is detected in the receiver by a resonant circuit at the carrier frequency. A message is sent by changing the carrier wave's amplitude or its phase proportional to the desired transmission signal. If the amplitude is changed, amplitude modulation results, and a change of phase results in phase modulation, a form of frequency modulation.