In April 4, 2014, famous Apple information website Apple Insider reports that Apple Company has applied to the US Patent and Trademark Office for its newly developed product – noise cancelling headphones, which is cable of suppressing noise and identifying users ‘voices.
The full name of this patent is called “the system that identify users’voice activity by sensor”; according to its product description, user’s voice will be distinguished after flowing through ear plugs and cables and identified by inertial sensor (accelerator) and microphone array.