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A carrier signal is a specific frequency in an analog communication channel that is modulated with an information-carrying signal. Carrier signals are commonly used in AM, FM, and other radio transmissions to differentiate among channels. When you turn a radio dial, you are selecting a carrier frequency. The radio then amplifies the signal carried on the selected frequency. In AM (amplitude modulation), modulation changes the strength or amplitude of the carrier signal. In FM (frequency modulation), the frequency of the carrier signal is modulated.
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