Discussion
A signal whose spectrum sits at low frequencies, before any carrier is applied, is called a _____ signal.
Answer: A
It is a baseband signal. Passband describes the same information after modulation has translated it up to a carrier. An analytic signal is the one-sided complex representation constructed with the Hilbert transform. Quadrature refers to a component in phase opposition of ninety degrees, one half of a complex envelope. The baseband and passband pair is the fundamental division in the subject, since every modulation scheme is a rule for moving between them.
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