US Patent 10080078 Battery-less, noise-cancellation headset

Methods and apparatus for a battery-less, noise-cancellation headset compatible with 4-pin audio jack are generally described herein. An example head device to support a noise cancellation function may include a first microphone associated with a first speaker, and a second microphone associated with a second speaker. The example headset device may further include an audio plug having a single microphone contact, and a controller circuit to oscillate back and forth between coupling the first microphone and the second microphone to the single microphone contact at a predetermined frequency.