mirror of https://github.com/saitohirga/WSJT-X.git
162 lines
4.1 KiB
Fortran
162 lines
4.1 KiB
Fortran
subroutine extract(s3,nadd,ntrials,naggressive,ndepth,mycall_12, &
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hiscall_12,hisgrid,nexp_decode,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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use timer_module, only: timer
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real s3(64,63)
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character decoded*22
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character*12 mycall_12,hiscall_12
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character*6 mycall,hiscall,hisgrid
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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 correct(63),tmp(63)
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integer param(0:8)
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logical ltext
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common/chansyms65/correct
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common/test000/param !### TEST ONLY ###
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common/test001/s3a(64,63),mrs(63),mrs2(63) !### TEST ONLY ###
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save
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mycall=mycall_12(1:6)
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hiscall=hiscall_12(1:6)
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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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s3a=s3 !###
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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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iftest=0
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if(iftest.eq.2) go to 10
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call timer('ftrsd ',0)
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param=0
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call ftrsd2(mrsym,mrprob,mr2sym,mr2prob,ntrials,correct,param,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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rtt=0.001*param(4)
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ntotal=param(5)
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qual=0.001*param(7)
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nd0=81
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r0=0.87
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if(naggressive.eq.10) then
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nd0=83
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r0=0.90
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endif
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if(ntotal.le.nd0 .and. rtt.le.r0) nft=1
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if(iftest.eq.1) nft=1 !### TEST ONLY ###
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10 if(iftest.eq.2 .or. (nft.eq.0 .and. ndepth.ge.5)) then
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mode65=1
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flip=1.0
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qmin=1.0
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call timer('exp_deco',0)
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call exp_decode65(s3,mrs,mrs2,mrsym,mr2sym,mrprob,mode65,flip, &
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mycall,hiscall,hisgrid,nexp_decode,qual,decoded)
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if(qual.ge.qmin) then
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nft=2
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else
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decoded=' '
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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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return
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end subroutine extract
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subroutine getpp(workdat,p)
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integer workdat(63)
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integer a(63)
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common/test001/s3a(64,63),mrs(63),mrs2(63)
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a(1:63)=workdat(63:1:-1)
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call interleave63(a,1)
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call graycode(a,63,1,a)
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psum=0.
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do j=1,63
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i=a(j)+1
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x=s3a(i,j)
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s3a(i,j)=0.
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psum=psum + x
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s3a(i,j)=x
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enddo
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p=psum/63.0
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return
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end subroutine getpp
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