Question
Which of the following describes combining speech with an RF carrier signal?
Answer Options
- A) Impedance matching
- B) Oscillation
- C) Modulation
- D) Low-pass filtering
Correct Answer: C
Explanation
Modulation is the technical term for combining a low-frequency information signal (like speech, music, or digital data) with a high-frequency radio frequency (RF) carrier signal. This process imposes the information onto the carrier signal so that it can be efficiently transmitted through the air.
Modulation is essential because simply transmitting the audio signal alone would not be efficient; the high-frequency RF carrier wave is necessary for the signal to propagate over long distances. The type of modulation determines the bandwidth and characteristics of the transmitted signal.
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