Carson bandwidth rule

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In telecommunication, Carson's bandwidth rule defines the approximate bandwidth requirements of communications system components for a carrier signal that is frequency modulated by a continuous or broad spectrum of frequencies rather than a single frequency.

Carson's bandwidth rule is expressed by the relation CBR = 2(Δf + f m) where CBR is the bandwidth requirement, Δf is the peak frequency deviation, and f m is the highest modulating frequency.

For example, an FM signal with 5kHz peak deviation, and a maximum audio frequency of 3kHz, would require a bandwidth of approximately 2(5+3) = 16kHz.

Carson's bandwidth rule is often applied to transmitters, antennas, optical sources, receivers, photodetectors, and other communications system components.


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