, the term baseband
has the following meanings:
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.
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.
Source: from Federal Standard 1037C and from MIL-STD-188