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