Discussion
A double sideband suppressed carrier signal is generated by
Answer: A
A balanced modulator produces the product of message and carrier, and its symmetry cancels the carrier at the output so only the two sidebands remain. An envelope detector is a demodulator, not a modulator. A saturated class C stage generates harmonics rather than a clean product. And a reactance modulator with multipliers is the classic frequency modulation chain, which produces an angle-modulated signal with a constant envelope, quite unlike DSB-SC.
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