{HEAD ~ The mixed signal} is coupled through a demultiplexer to {TAIL ~ respective inputs} of first, second, third and fourth low pass filters, each of which has a cut off frequency which is one half of the decoder passband 
{ HEAD ~ The mixed signal } is coupled through a demultiplexer to { TAIL ~ respective inputs } of first , second , third and fourth low pass filters , each of which has a cut off frequency which is one half of the decoder passband
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH