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