H12-311_V3.0 · Question #247
According to the different signal parameters to be controlled, what kind of modulation methods can be divided into? (Multiple choice)
The correct answer is A. AM B. FM C. Phasing. Modulation works by varying one of the three fundamental parameters of a carrier wave - amplitude, frequency, or phase - to encode information, giving rise to AM (Amplitude Modulation), FM (Frequency Modulation), and PM (Phase Modulation) respectively. Each represents a…
Question
According to the different signal parameters to be controlled, what kind of modulation methods can be divided into? (Multiple choice)
Options
- AAM
- BFM
- CPhasing
- DModulation
How the community answered
(22 responses)- A73% (16)
- D27% (6)
Explanation
Modulation works by varying one of the three fundamental parameters of a carrier wave - amplitude, frequency, or phase - to encode information, giving rise to AM (Amplitude Modulation), FM (Frequency Modulation), and PM (Phase Modulation) respectively. Each represents a distinct classification based on which parameter is being controlled, which is exactly what the question asks.
Option D ("Modulation") is wrong because it names the overarching process itself, not a specific type of modulation - it's the category, not a member of the category.
Memory tip: Think of a carrier wave as having three "knobs" you can turn - how loud (Amplitude), how fast it oscillates (Frequency), and where it starts in its cycle (Phase). One knob = one modulation type: AM, FM, PM.
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