A digital system can in theory adjust the phase of the cancellation to account for the latency of the processing. It still wouldn't account for sudden changes in the noise levels. If it's a periodic noise it could pick up on the longer modulation of the components, e.g. one frequency fading in and out.
But it seems like it also matters where the sound wave is coming into the room. You could cancel it in one area but reinforce in another. Maybe they have mics around the room and tailor the cancellation in each region.
A digital system can in theory adjust the phase of the cancellation to account for the latency of the processing. It still wouldn't account for sudden changes in the noise levels. If it's a periodic noise it could pick up on the longer modulation of the components, e.g. one frequency fading in and out.
But it seems like it also matters where the sound wave is coming into the room. You could cancel it in one area but reinforce in another. Maybe they have mics around the room and tailor the cancellation in each region.
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