first differential amplifier means for generating a left right differential output signal which is a function of the difference in {HEAD ~ amplitude} of {TAIL ~ said left and right output pulses} 
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first differential amplifier means for generating a left right differential output signal which is a function of the difference in { HEAD ~ amplitude } of { TAIL ~ said left and right output pulses }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL