article_snippet: ’s hands movements using ultrasound to skip through images, play and pause videos and music, take selfies and control characters in online games.
article_snippet: Ultrasound signals sent through the air from speakers in smartphones and tablets bounce against a user’s hand and are recorded by standard microphones.
article_snippet: Ultrasound signals sent through the air from speakers in smartphones and tablets bounce against a user’s hand and are recorded by standard microphones.
article_snippet: The active area is 180 degrees around the device made possible by ultrasound [and]
highlights_snippet: The system tracks a users hands movements using ultrasound .
  
highlights_snippet: Ultrasound signals sent through the air from speakers in smartphones and tablets bounce against a user’s hand and are recorded by microphones .
  