Phase Modulation for Digital Baseband Signals | Generated by AI
Question: What is the modulation method called when the initial phase of a carrier wave varies according to a digital baseband signal?
Answer: The correct answer is C) Phase Modulation (调相).
Explanation
- Phase Modulation (PM / Phase-Shift Keying): In this scheme, the phase (or initial phase) of the high-frequency carrier wave is altered in proportion to the changes in the modulating baseband signal.
- Frequency Modulation (FM): The frequency of the carrier wave changes according to the baseband signal, while its amplitude and phase remain constant.
- Amplitude Modulation (AM): The amplitude of the carrier wave changes according to the baseband signal, while its frequency and phase remain constant.
Since the question explicitly states that the initial phase varies with the baseband signal, it refers to Phase Modulation (调相).
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