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> I'm perplexed how it works then. this is generally what happens when you open the USB spec and read it. also, it doesn't work very well.
AFAIK you do use a differential receiver for HS data, it's just that you *also* need single ended comparators to detect EOP. Also this design is almost the worst possible design for audio devices. USB audio whine is now a plague, even in professional productions.
if I remember correctly, the data lines are referenced to ground, so while you certainly -could- use a differential comparator, it doesn't give you a lot of advantage
The termination is through GND (half the differential impedance on each leg), but you still need to use a differential receiver. There's no way you can get the required noise immunity without one.
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