mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-26 22:28:41 -05:00
22340f66e4
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6748 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
173 lines
4.9 KiB
Fortran
173 lines
4.9 KiB
Fortran
module jt9_decode
|
|
|
|
type :: jt9_decoder
|
|
procedure(jt9_decode_callback), pointer :: callback
|
|
contains
|
|
procedure :: decode
|
|
end type jt9_decoder
|
|
|
|
abstract interface
|
|
subroutine jt9_decode_callback (this, sync, snr, dt, freq, drift, &
|
|
decoded)
|
|
import jt9_decoder
|
|
implicit none
|
|
class(jt9_decoder), intent(inout) :: this
|
|
real, intent(in) :: sync
|
|
integer, intent(in) :: snr
|
|
real, intent(in) :: dt
|
|
real, intent(in) :: freq
|
|
integer, intent(in) :: drift
|
|
character(len=22), intent(in) :: decoded
|
|
end subroutine jt9_decode_callback
|
|
end interface
|
|
|
|
contains
|
|
|
|
subroutine decode(this,callback,ss,id2,nfqso,newdat,npts8,nfa, &
|
|
nfsplit,nfb,ntol,nzhsym,nagain,ndepth,nmode,nsubmode,nexp_decode)
|
|
use timer_module, only: timer
|
|
|
|
include 'constants.f90'
|
|
class(jt9_decoder), intent(inout) :: this
|
|
procedure(jt9_decode_callback) :: callback
|
|
real ss(184,NSMAX)
|
|
logical, intent(in) :: newdat, nagain
|
|
character*22 msg
|
|
real*4 ccfred(NSMAX)
|
|
real*4 red2(NSMAX)
|
|
logical ccfok(NSMAX)
|
|
logical done(NSMAX)
|
|
integer*2 id2(NTMAX*12000)
|
|
integer*1 i1SoftSymbols(207)
|
|
common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
|
|
save ccfred,red2
|
|
|
|
if(nexp_decode.eq.-99) stop !Silence compiler warning
|
|
this%callback => callback
|
|
if(nmode.eq.9 .and. nsubmode.ge.1) then
|
|
call decode9w(nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt,freq,msg)
|
|
if (associated(this%callback)) then
|
|
ndrift=0
|
|
call this%callback(sync,nsnr,xdt,freq,ndrift,msg)
|
|
end if
|
|
go to 999
|
|
endif
|
|
|
|
nsynced=0
|
|
ndecoded=0
|
|
nsps=6912 !Params for JT9-1
|
|
df3=1500.0/2048.0
|
|
|
|
tstep=0.5*nsps/12000.0 !Half-symbol step (seconds)
|
|
done=.false.
|
|
|
|
nf0=0
|
|
nf1=nfa
|
|
if(nmode.eq.65+9) nf1=nfsplit
|
|
ia=max(1,nint((nf1-nf0)/df3))
|
|
ib=min(NSMAX,nint((nfb-nf0)/df3))
|
|
lag1=-int(2.5/tstep + 0.9999)
|
|
lag2=int(5.0/tstep + 0.9999)
|
|
if(newdat) then
|
|
call timer('sync9 ',0)
|
|
call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipk)
|
|
call timer('sync9 ',1)
|
|
endif
|
|
|
|
nsps8=nsps/8
|
|
df8=1500.0/nsps8
|
|
dblim=db(864.0/nsps8) - 26.2
|
|
|
|
ia1=1 !quel compiler gripe
|
|
ib1=1 !quel compiler gripe
|
|
do nqd=1,0,-1
|
|
limit=5000
|
|
ccflim=3.0
|
|
red2lim=1.6
|
|
schklim=2.2
|
|
if(iand(ndepth,7).eq.2) then
|
|
limit=10000
|
|
ccflim=2.7
|
|
endif
|
|
if(iand(ndepth,7).eq.3 .or. nqd.eq.1) then
|
|
limit=30000
|
|
ccflim=2.5
|
|
schklim=2.0
|
|
endif
|
|
if(nagain) then
|
|
limit=100000
|
|
ccflim=2.4
|
|
schklim=1.8
|
|
endif
|
|
ccfok=.false.
|
|
|
|
if(nqd.eq.1) then
|
|
nfa1=nfqso-ntol
|
|
nfb1=nfqso+ntol
|
|
ia=max(1,nint((nfa1-nf0)/df3))
|
|
ib=min(NSMAX,nint((nfb1-nf0)/df3))
|
|
ccfok(ia:ib)=(ccfred(ia:ib).gt.(ccflim-2.0)) .and. &
|
|
(red2(ia:ib).gt.(red2lim-1.0))
|
|
ia1=ia
|
|
ib1=ib
|
|
else
|
|
nfa1=nf1
|
|
nfb1=nfb
|
|
ia=max(1,nint((nfa1-nf0)/df3))
|
|
ib=min(NSMAX,nint((nfb1-nf0)/df3))
|
|
do i=ia,ib
|
|
ccfok(i)=ccfred(i).gt.ccflim .and. red2(i).gt.red2lim
|
|
enddo
|
|
ccfok(ia1:ib1)=.false.
|
|
endif
|
|
|
|
fgood=0.
|
|
do i=ia,ib
|
|
if(done(i) .or. (.not.ccfok(i))) cycle
|
|
f=(i-1)*df3
|
|
if(nqd.eq.1 .or. &
|
|
(ccfred(i).ge.ccflim .and. abs(f-fgood).gt.10.0*df8)) then
|
|
|
|
call timer('softsym ',0)
|
|
fpk=nf0 + df3*(i-1)
|
|
call softsym(id2,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt, &
|
|
freq,drift,a3,schk,i1SoftSymbols)
|
|
call timer('softsym ',1)
|
|
|
|
sync=(syncpk+1)/4.0
|
|
if(nqd.eq.1 .and. ((sync.lt.0.5) .or. (schk.lt.1.0))) cycle
|
|
if(nqd.ne.1 .and. ((sync.lt.1.0) .or. (schk.lt.1.5))) cycle
|
|
|
|
call timer('jt9fano ',0)
|
|
call jt9fano(i1SoftSymbols,limit,nlim,msg)
|
|
call timer('jt9fano ',1)
|
|
|
|
if(sync.lt.0.0 .or. snrdb.lt.dblim-2.0) sync=0.0
|
|
nsync=int(sync)
|
|
if(nsync.gt.10) nsync=10
|
|
nsnr=nint(snrdb)
|
|
ndrift=nint(drift/df3)
|
|
num9=num9+1
|
|
|
|
if(msg.ne.' ') then
|
|
numfano=numfano+1
|
|
if (associated(this%callback)) then
|
|
call this%callback(sync,nsnr,xdt,freq,ndrift,msg)
|
|
end if
|
|
iaa=max(1,i-1)
|
|
ibb=min(NSMAX,i+22)
|
|
fgood=f
|
|
nsynced=1
|
|
ndecoded=1
|
|
ccfok(iaa:ibb)=.false.
|
|
done(iaa:ibb)=.true.
|
|
endif
|
|
endif
|
|
enddo
|
|
if(nagain) exit
|
|
enddo
|
|
|
|
999 return
|
|
end subroutine decode
|
|
end module jt9_decode
|