Discussion
In FM, what does a direct-current component in the message produce?
Answer: A
A constant message deviates the frequency constantly, so the carrier sits off its nominal channel for as long as the offset persists, which is why FM audio chains are always alternating-coupled. The constant-phase result belongs to PM, where it is harmless but useless. Saying there is no effect ignores the definition of frequency deviation. And amplitude is unaffected in any angle modulation.
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