Discussion
What does automatic gain control do?
Answer: A
It reduces the gain on strong signals and restores it on weak ones, so the output stays roughly constant across a wide range of input levels. It cannot improve a signal-to-noise ratio, since it scales signal and noise together, which is the point most often misunderstood about it. Selectivity is fixed by the filters. And tracking is a tuning matter. A control loop can only regulate the quantity it measures, and here that quantity is level.
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