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