Discussion
Shifting a signal in time changes its spectrum by
Answer: A
A delay multiplies the spectrum by a complex exponential, which is a linear phase term; the amplitude spectrum is unchanged. That is why a delay is inaudible in isolation but destroys the waveform of a wideband signal if it varies with frequency, which is precisely the phase distortion a real channel imposes. Amplitude scaling comes from a gain change. A frequency shift comes from multiplication by a sinusoid, not from a delay. And the spectrum is certainly affected, in phase if not in magnitude.
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