2006-09-06 14:09:05 -04:00
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subroutine extract(s3,nadd,ncount,decoded)
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real s3(64,63)
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character decoded*22
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integer era(51),dat4(12),indx(63)
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integer mrsym(63),mr2sym(63),mrprob(63),mr2prob(63)
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logical first
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data first/.true./,nsec1/0/
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save
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call demod64a(s3,nadd,mrsym,mrprob,mr2sym,mr2prob,ntest,nlow)
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if(ntest.lt.50 .or. nlow.gt.20) then
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ncount=-999 !Flag bad data
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go to 900
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endif
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call graycode(mrsym,63,-1)
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call interleave63(mrsym,-1)
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call interleave63(mrprob,-1)
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ndec=1
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nemax=30
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maxe=8
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xlambda=15.0
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if(ndec.eq.1) then
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call graycode(mr2sym,63,-1)
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call interleave63(mr2sym,-1)
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call interleave63(mr2prob,-1)
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nsec1=nsec1+1
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write(22,rec=1) nsec1,xlambda,maxe,200,
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+ mrsym,mrprob,mr2sym,mr2prob
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call flushqqq(22)
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call runqqq('kvasd.exe','-q',iret)
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if(iret.ne.0) then
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if(first) write(*,1000)
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1000 format('Error in KV decoder, or no KV decoder present.'/
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+ 'Using BM algorithm.')
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ndec=0
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first=.false.
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go to 20
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endif
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read(22,rec=2) nsec2,ncount,dat4
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decoded=' '
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if(ncount.ge.0) then
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call unpackmsg(dat4,decoded) !Unpack the user message
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endif
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endif
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20 if(ndec.eq.0) then
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call indexx(63,mrprob,indx)
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do i=1,nemax
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j=indx(i)
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if(mrprob(j).gt.120) then
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ne2=i-1
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go to 2
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endif
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era(i)=j-1
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enddo
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ne2=nemax
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2 decoded=' '
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do nerase=0,ne2,2
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call rs_decode(mrsym,era,nerase,dat4,ncount)
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if(ncount.ge.0) then
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call unpackmsg(dat4,decoded)
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go to 900
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endif
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enddo
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endif
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900 return
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end
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