subroutine extract(s3,nadd,mode65,ntrials,naggressive,ndepth,nflip, & mycall_12,hiscall_12,hisgrid,nexp_decode,ncount,nhist,decoded, & ltext,nft,qual) ! Input: ! s3 64-point spectra for each of 63 data symbols ! nadd number of spectra summed into s3 ! nqd 0/1 to indicate decode attempt at QSO frequency ! Output: ! ncount number of symbols requiring correction (-1 for no KV decode) ! nhist maximum number of identical symbol values ! decoded decoded message (if ncount >=0) ! ltext true if decoded message is free text ! nft 0=no decode; 1=FT decode; 2=hinted decode use prog_args !shm_key, exe_dir, data_dir use packjt use jt65_mod use timer_module, only: timer real s3(64,63) character decoded*22 character*12 mycall_12,hiscall_12 character*6 mycall,hiscall,hisgrid integer dat4(12) integer mrsym(63),mr2sym(63),mrprob(63),mr2prob(63) integer correct(63),tmp(63) logical ltext common/chansyms65/correct save if(mode65.eq.-99) stop !Silence compiler warning mycall=mycall_12(1:6) hiscall=hiscall_12(1:6) qual=0. nbirdie=20 npct=50 afac1=1.1 nft=0 nfail=0 decoded=' ' call pctile(s3,4032,npct,base) s3=s3/base s3a=s3 !### ! Get most reliable and second-most-reliable symbol values, and their ! probabilities 1 call demod64a(s3,nadd,afac1,mrsym,mrprob,mr2sym,mr2prob,ntest,nlow) call chkhist(mrsym,nhist,ipk) !Test for birdies and QRM if(nhist.ge.nbirdie) then nfail=nfail+1 call pctile(s3,4032,npct,base) s3(ipk,1:63)=base if(nfail.gt.30) then decoded=' ' ncount=-1 go to 900 endif go to 1 endif mrs=mrsym mrs2=mr2sym call graycode65(mrsym,63,-1) !Remove gray code call interleave63(mrsym,-1) !Remove interleaving call interleave63(mrprob,-1) call graycode65(mr2sym,63,-1) !Remove gray code and interleaving call interleave63(mr2sym,-1) !from second-most-reliable symbols call interleave63(mr2prob,-1) ntry=0 call timer('ftrsd ',0) param=0 call ftrsd2(mrsym,mrprob,mr2sym,mr2prob,ntrials,correct,param,ntry) call timer('ftrsd ',1) ncandidates=param(0) nhard=param(1) nsoft=param(2) nerased=param(3) rtt=0.001*param(4) ntotal=param(5) qual=0.001*param(7) nd0=81 r0=0.87 if(naggressive.eq.10) then nd0=83 r0=0.90 endif if(ntotal.le.nd0 .and. rtt.le.r0) nft=1 if(nft.eq.0 .and. iand(ndepth,32).eq.32) then qmin=2.0 - 0.1*naggressive call timer('hint65 ',0) call hint65(s3,mrs,mrs2,nadd,nflip,mycall,hiscall,hisgrid,qual,decoded) if(qual.ge.qmin) then nft=2 ncount=0 else decoded=' ' ntry=0 endif call timer('hint65 ',1) go to 900 endif ncount=-1 decoded=' ' ltext=.false. if(nft.gt.0) then ! Turn the corrected symbol array into channel symbols for subtraction; ! pass it back to jt65a via common block "chansyms65". do i=1,12 dat4(i)=correct(13-i) enddo do i=1,63 tmp(i)=correct(64-i) enddo correct(1:63)=tmp(1:63) call interleave63(correct,63,1) call graycode65(correct,63,1) call unpackmsg(dat4,decoded,.false.,' ') !Unpack the user message ncount=0 if(iand(dat4(10),8).ne.0) ltext=.true. endif 900 continue if(nft.eq.1 .and. nhard.lt.0) decoded=' ' return end subroutine extract subroutine getpp(workdat,p) use jt65_mod integer workdat(63) integer a(63) a(1:63)=workdat(63:1:-1) call interleave63(a,1) call graycode(a,63,1,a) psum=0. do j=1,63 i=a(j)+1 x=s3a(i,j) s3a(i,j)=0. psum=psum + x s3a(i,j)=x enddo p=psum/63.0 return end subroutine getpp