4 ms·

But you could surely just randomly vary the beamforming to get the same effect, right?

• Raidion 5y ago
  Beam still has to be in the direction of the mic, which wouldn't help if your body is blocking most of the direct waves. You get some scattering, sure, but I think ultrasonic is pretty absorbable, right?
  • ris 5y ago
    But the same is also true for rotating the bracelet isn't it?
    • pepoluan 5y ago
      The bracelet does not have directional speakers, so the ultrasonic waves will kind of spread everywhere, bouncing off hard surfaces, and ultimately reaches the eavesdropping device.