The control unit includes {TAIL ~ circuitry} for driving the output transducer based on electrical signals from {HEAD ~ the input transducers} with an amplitude and phase to perform the noise cancellation, sound filtering, communication interface, and headphone functions 
The control unit includes { TAIL ~ circuitry } for driving the output transducer based on electrical signals from { HEAD ~ the input transducers } with an amplitude and phase to perform the noise cancellation , sound filtering , communication interface , and headphone functions
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH