The envelope detection circuit 23 has 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 {HEAD ~ the case} of {TAIL ~ the envelope detection circuit} 9 
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The envelope detection circuit 23 has 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 { HEAD ~ the case } of { TAIL ~ the envelope detection circuit } 9
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