Baseband is an adjective that describes signals and systems whose range of
frequencies is measured from 0 to a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at 0. It can often be considered as synonym to lowpass, and antonym to
passband.
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1. The original
band of frequencies produced by a
transducer, such as a microphone, telegraph key, or other
signal-initiating device, prior to initial
modulation. Note 1: In
transmission systems, the baseband signal is usually used to modulate a
carrier. Note 2:
Demodulation re-creates the baseband signal. Note 3: Baseband describes the signal state prior to modulation, prior to
multiplexing, following
demultiplexing, and following demodulation. (
188 ) Note 4: Baseband frequencies are usually characterized by being much lower in
frequency than the frequencies that result when the baseband signal is used to modulate a carrier or
subcarrier. 2. In
facsimile, the frequency of a signal equal in
bandwidth to that between zero frequency and
maximum keying frequency. (
188 )
A transmission medium through which digital signals are sent without frequency shifting. In general, only one communication channel is available at any given time.
Ethernet is an example of a baseband network.
See also
broadband.
(1995-02-22)
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