The encoding circuit 11 performs {HEAD ~ multiplication} of the two inputs thus supplied and coding of those inputs to {TAIL ~ digital signals} 
The encoding circuit 11 performs { HEAD ~ multiplication } of the two inputs thus supplied and coding of those inputs to { TAIL ~ digital signals }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL