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