Discussion
What is spectral inversion, as heard on the wrong sideband?
Answer: D
Selecting the opposite sideband mirrors the recovered spectrum about the reinsertion frequency, so the lowest message components come out highest and speech becomes unintelligible noise. It is a qualitatively different fault from a frequency error, which shifts everything by a constant amount and leaves speech recognisable. A delay would be inaudible. A uniform amplitude change is a level matter. Distinguishing inversion from offset by ear is a useful diagnostic skill.
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