[Elecraft] Noise cancelling headphones

[ANDY DURBIN]

Can anyone point me to a specification for any aviation headset that claims the microphone has active noise cancellation?   Can anyone point me to a specification for any non-aviation headset that claims the microphone has active noise cancellation?
Many/most aviation headsets use noise cancelling microphones but they are not active.  They simply sample most of the voice signal on the mouth side of the element and most of the noise on both sides of the element.   Effective noise cancellation requires the microphone to be close to the lips.   I fly with DC H10-13S converted to active noise cancellation.  The same active noise cancelling conversion can be done on many headsets that copy the DC design for the ear "cups".
http://www.headsetsinc.com/
73,
Andy k3wyc