{TAIL ~ The envelope detection circuit} 23 has {HEAD ~ amplitude increase detection slice levels} f5 and f6 newly set therein to be positioned about 40% above each of the upper envelope g1 and lower envelope g2 unlike the case of the envelope detection circuit 9 
{ TAIL ~ The envelope detection circuit } 23 has { HEAD ~ amplitude increase detection slice levels } f5 and f6 newly set therein to be positioned about 40 % above each of the upper envelope g1 and lower envelope g2 unlike the case of the envelope detection circuit 9
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