Discussion
Which two quantities must a receiver reproduce faithfully before decoding can work?
Answer: A
The decoder needs the composite recovered with its amplitudes and phases intact, since the difference signal is detected coherently against the regenerated subcarrier. Deviation and carrier frequency describe the transmitted signal rather than what the decoder consumes. Pilot level and intermediate frequency are conditions rather than the signal. And audio bandwidth and de-emphasis act after decoding. Coherent detection always imposes requirements on phase as well as amplitude, which is why the pilot exists.
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