Demodulation is accomplished by which pair of processes (filtering)?

Demodulation is accomplished by which pair of processes (filtering)?

• A. Rectification and Smoothing
• B. Amplification and Filtering
• C. Demodulation and Dynamic range
• D. Compression and Rejection

Answer: (A)

Demodulation aims to recover the original message from an amplitude-modulated carrier by pulling out the envelope. This is accomplished with two steps: rectification, which converts the alternating carrier into a pulsating signal whose magnitude follows the modulation, and smoothing, which filters out the carrier’s high-frequency components so only the slowly varying baseband signal remains. In an envelope detector, a diode provides rectification and an RC network provides smoothing, yielding the recovered audio or data. The other pairings don’t capture how the envelope is extracted or how the carrier is removed to reveal the message.

Demodulation aims to recover the original message from an amplitude-modulated carrier by pulling out the envelope. This is accomplished with two steps: rectification, which converts the alternating carrier into a pulsating signal whose magnitude follows the modulation, and smoothing, which filters out the carrier’s high-frequency components so only the slowly varying baseband signal remains. In an envelope detector, a diode provides rectification and an RC network provides smoothing, yielding the recovered audio or data. The other pairings don’t capture how the envelope is extracted or how the carrier is removed to reveal the message.