Discussion
An SSB receiver recovers the message by
Answer: D
The receiver reinserts a local carrier at the right frequency and mixes, translating the sideband back to baseband. That oscillator is the beat frequency oscillator of traditional sets. Envelope detection cannot work, since one sideband alone has an envelope unrelated to the message. Limiting and discriminating is FM demodulation. And squaring produces the message multiplied by itself along with unwanted products. Which of the two economies applies is worth naming before any arithmetic is attempted.
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