Apple files patent application for improved noise cancellation for wireless earbuds
Using a number of sensors, including one that tracks the vibrations from the user's bones, the system determines which of the two earbuds is producing the higher quality signal, which is passed along to a mobile device. Additionally, sensors and acoustical information is used to determine if an earbud is actually in a user's ear. If the system determines that one earbud is not being employed, voice output would default to the second earbud.
The application is number 20150245129, and was originally filed on February 21, 2014. Apple has yet to unveil a set of wireless headphones for the iPhone and there is no indication that it might do so this year. Of course, that doesn't preclude Apple from using this technology in a future set of wireless earphones for its iconic smartphone.
source: USPTO via AppleInsider