mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-16 09:01:59 -05:00
b557035d0c
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6181 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
110 lines
2.9 KiB
Fortran
110 lines
2.9 KiB
Fortran
subroutine extract(s3,nadd,nqd,ntrials,naggressive,ndepth,nexp_decode, &
|
|
ncount,nhist,decoded,ltext,nsf)
|
|
|
|
! 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
|
|
! nsf 0=no decode; 1=BM decode; 2=KV decode
|
|
|
|
use prog_args !shm_key, exe_dir, data_dir
|
|
use packjt
|
|
|
|
real s3(64,63)
|
|
character decoded*22
|
|
integer dat4(12)
|
|
integer mrsym(63),mr2sym(63),mrprob(63),mr2prob(63)
|
|
integer correct(63),tmp(63)
|
|
integer param(0:7)
|
|
integer indx(0:62)
|
|
real*8 tt
|
|
logical nokv,ltext
|
|
common/chansyms65/correct
|
|
data nokv/.false./,nsec1/0/
|
|
save
|
|
|
|
nbirdie=20
|
|
npct=50
|
|
afac1=1.1
|
|
nsf=0
|
|
nfail=0
|
|
decoded=' '
|
|
call pctile(s3,4032,npct,base)
|
|
s3=s3/base
|
|
! 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
|
|
|
|
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
|
|
|
|
nverbose=0
|
|
call timer('sfrsd ',0)
|
|
call sfrsd2(mrsym,mrprob,mr2sym,mr2prob,ntrials,nverbose,correct, &
|
|
param,indx,tt,ntry)
|
|
call timer('sfrsd ',1)
|
|
ncandidates=param(0)
|
|
nhard=param(1)
|
|
nsoft=param(2)
|
|
|
|
if(nhard.lt.0 .and. ndepth.ge.5) then
|
|
call timer('exp_deco',0)
|
|
call exp_decode65(mrsym,mrprob,mr2sym,nexp_decode,nhard,nsoft,nbest, &
|
|
correct)
|
|
if(nbest.gt.72+2*naggressive) then
|
|
nhard=-1
|
|
endif
|
|
call timer('exp_deco',1)
|
|
endif
|
|
|
|
ndone=ndone+1
|
|
ncount=-1
|
|
decoded=' '
|
|
ltext=.false.
|
|
if(nhard.ge.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) !Unpack the user message
|
|
ncount=0
|
|
if(iand(dat4(10),8).ne.0) ltext=.true.
|
|
nsf=1
|
|
endif
|
|
900 continue
|
|
|
|
return
|
|
end subroutine extract
|