{HEAD ~ A first analogue signal} and {TAIL ~ a second analogue signal} to be multiplied are supplied to a first comparator group 10a and a second comparator group 10b, respectively 
{ HEAD ~ A first analogue signal } and { TAIL ~ a second analogue signal } to be multiplied are supplied to a first comparator group 10a and a second comparator group 10b , respectively
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH