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I never heard of Hear One until now. I need this, heating exams insists my hearing is fine, and yet…

From an audio processing perspective, how would I even build the software?

My guess is it's using timing of arrival. If there are two microphones a head apart there is a usable difference left to right. Just filter out what is out of sync given a difference. Over to you!

it's a well studied problem with many standard algorithms: https://en.wikipedia.org/wiki/Cocktail_party_effect

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