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 {TAIL ~ the upper envelope} g1 and lower envelope g2 unlike the case of the envelope detection circuit 9 
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 { TAIL ~ the upper envelope } g1 and lower envelope g2 unlike the case of the envelope detection circuit 9
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH