In synchronism with the frequency fm, any components of the mixed signal that are related to sin fx and cos fx, where fx =|fi fr |, provided that fx is substantially equal to or less than fb /2, are filtered to provide a filtered signal alternating at {TAIL ~ the frequency fm} between {HEAD ~ values} related to sin fx and cos fx  
In synchronism with the frequency fm , any components of the mixed signal that are related to sin fx and cos fx , where fx = |fi fr | , provided that fx is substantially equal to or less than fb /2 , are filtered to provide a filtered signal alternating at { TAIL ~ the frequency fm } between { HEAD ~ values } related to sin fx and cos fx
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH