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