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https://github.com/saitohirga/WSJT-X.git
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56a58fe6ab
(aka experience-based) decoding. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6256 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
133 lines
3.5 KiB
Fortran
133 lines
3.5 KiB
Fortran
subroutine extract(s3,nadd,nqd,ntrials,naggressive,ndepth, &
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ncount,nhist,decoded,ltext,nft,qual)
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! Input:
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! s3 64-point spectra for each of 63 data symbols
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! nadd number of spectra summed into s3
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! nqd 0/1 to indicate decode attempt at QSO frequency
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! Output:
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! ncount number of symbols requiring correction (-1 for no KV decode)
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! nhist maximum number of identical symbol values
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! decoded decoded message (if ncount >=0)
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! ltext true if decoded message is free text
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! nft 0=no decode; 1=FT decode; 2=hinted decode
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use prog_args !shm_key, exe_dir, data_dir
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use packjt
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real s3(64,63)
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character decoded*22
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character*6 mycall
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integer dat4(12)
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integer mrsym(63),mr2sym(63),mrprob(63),mr2prob(63)
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integer mrs(63),mrs2(63)
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integer correct(63),tmp(63)
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integer param(0:7)
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integer indx(0:62)
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real*8 tt
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logical nokv,ltext
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common/chansyms65/correct
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common/test000/param !### TEST ONLY ###
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data nokv/.false./,nsec1/0/
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save
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qual=0.
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nbirdie=20
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npct=50
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afac1=1.1
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nft=0
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nfail=0
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decoded=' '
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call pctile(s3,4032,npct,base)
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s3=s3/base
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! Get most reliable and second-most-reliable symbol values, and their
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! probabilities
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1 call demod64a(s3,nadd,afac1,mrsym,mrprob,mr2sym,mr2prob,ntest,nlow)
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call chkhist(mrsym,nhist,ipk) !Test for birdies and QRM
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if(nhist.ge.nbirdie) then
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nfail=nfail+1
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call pctile(s3,4032,npct,base)
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s3(ipk,1:63)=base
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if(nfail.gt.30) then
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decoded=' '
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ncount=-1
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go to 900
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endif
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go to 1
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endif
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mrs=mrsym
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mrs2=mr2sym
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call graycode65(mrsym,63,-1) !Remove gray code
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call interleave63(mrsym,-1) !Remove interleaving
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call interleave63(mrprob,-1)
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call graycode65(mr2sym,63,-1) !Remove gray code and interleaving
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call interleave63(mr2sym,-1) !from second-most-reliable symbols
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call interleave63(mr2prob,-1)
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ntry=0
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nverbose=0
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call timer('ftrsd ',0)
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call ftrsd2(mrsym,mrprob,mr2sym,mr2prob,ntrials,nverbose,correct, &
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param,indx,tt,ntry)
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call timer('ftrsd ',1)
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ncandidates=param(0)
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nhard=param(1)
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nsoft=param(2)
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nerased=param(3)
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nsofter=param(4)
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ntotal=param(5)
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nhard_max=44
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nd_a=72 + naggressive
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if(nhard.le.nhard_max .and. ntotal.le.nd_a) nft=1
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! print*,'AAA',ndepth
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if(nft.eq.0 .and. ndepth.ge.5) then
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! print*,'BBB',ndepth
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call timer('exp_deco',0)
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mode65=1
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flip=1.0
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mycall='K1ABC' !### TEMPORARY ###
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call exp_decode65(s3,mrs,mrs2,mode65,flip,mycall,qual,decoded)
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if(qual.ge.1.0) then
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nft=2
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else
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param=0
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ntry=0
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endif
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call timer('exp_deco',1)
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go to 900
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endif
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ncount=-1
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decoded=' '
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ltext=.false.
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if(nft.gt.0) then
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!turn the corrected symbol array into channel symbols for subtraction
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!pass it back to jt65a via common block "chansyms65"
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do i=1,12
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dat4(i)=correct(13-i)
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enddo
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do i=1,63
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tmp(i)=correct(64-i)
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enddo
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correct(1:63)=tmp(1:63)
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call interleave63(correct,63,1)
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call graycode65(correct,63,1)
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call unpackmsg(dat4,decoded) !Unpack the user message
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ncount=0
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if(iand(dat4(10),8).ne.0) ltext=.true.
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endif
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900 continue
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if(nft.eq.1 .and. nhard.lt.0) decoded=' '
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! write(*,3300) nft,nhard,ntotal,int(qual),decoded
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!3300 format(4i5,2x,a22)
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return
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end subroutine extract
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