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