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