5 ms·

Are they not able to just use phase shifts and beamforming on the transducer array instead of the odd keep-moving-your-bracelet design?

• pepoluan 5y ago
  The case would be if someone is recording you with a microphone placed somewhere unknown in the room. With the bracelet, and humans' tendency to move their arms while speaking, microphones around the room will be jammed at least part of the time.
  • ris 5y ago
    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.