Discussion
Parseval's relation states that
Answer: B
Parseval equates the energy computed from the time waveform with the energy computed from the spectrum, which is the formal statement that a transform preserves energy. Conjugate symmetry of a real signal's spectrum is a separate and equally useful property. The time-bandwidth relation is a consequence of the transform but is not Parseval's statement. And the convolution theorem is a third distinct property, often confused with this one because both relate the two domains.
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