Baseband

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In telecommunications and signal processing, baseband is an adjective that describes signals and systems whose range of frequencies is measured from close to 0 hertz to a cut-off frequency, a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting close to zero. Baseband can often be considered as a synonym to lowpass or non-modulated, and antonym to passband, bandpass, carrier-modulated or radio frequency (RF) signal.

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Various uses

Baseband bandwidth

A baseband bandwidth is equal to the highest frequency of a signal or system, or an upper bound on such frequencies,[1] for example the upper cut-off frequency of a passband filter. By contrast, a passband bandwidth is the difference between a highest frequency and a nonzero lowest frequency.

Baseband channel

A baseband channel or lowpass channel (or system, or network) is a communication channel that can transfer frequencies that are very near zero.[2] Examples are serial cables and local area networks (LANs), as opposed to passband channels such as radio frequency channels and passband filtered wires of the analog telephone network. Frequency division multiplexing (FDM) allows an analog telephone wire to carry a baseband telephone call, concurrently as one or several carrier-modulated telephone calls.

Baseband transmission

Baseband transmission, also known as Baseband modulation or line coding,[3] aims at transferring a digital bit stream over a baseband channel, as an alternative to passband transmission, also known as carrier-modulated transmission.[4]

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