Challenge 1: Constant Fan Hum Even While Talking — Solution Walkthrough

The filter that directly addresses this:

Noise Suppression.

Why, per this chapter's own material:

Noise Suppression actively reduces steady background noise — fan hum
being a textbook example — while the person is actively speaking, not
just during silence. This is exactly the described problem: the fan
hum is present continuously, including during active speech, which is
specifically the case Noise Suppression is built to handle.

Why Noise Gate alone wouldn't fully solve it:

Per this chapter's own material, Noise Gate only mutes the source
entirely once it drops below a set volume threshold — it's designed
to silence background noise during pauses in speech, not to reduce
noise that's present at the same time as the person's voice. Since the
fan hum in this scenario continues even while the streamer is talking,
Noise Gate would have no effect on it during those moments — the
microphone signal is above the gate's threshold (because the person is
speaking), so the gate stays open and the fan hum passes through
alongside the voice.

Why using both together still makes sense:

Per this chapter's own material, Noise Gate and Noise Suppression are
complementary — Noise Gate handles the pauses, and Noise Suppression
handles the noise present during actual speech. Using Noise
Suppression alone would address this specific problem, but combining
both covers the full picture across pauses and active speech alike.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that the specific Noise-Gate-vs-Noise-Suppression
distinction from this chapter is understood as more than "two similar
noise tools" — correctly identifying which one addresses noise DURING
speech specifically.