mirror of https://github.com/saitohirga/WSJT-X.git
143 lines
3.8 KiB
Fortran
143 lines
3.8 KiB
Fortran
subroutine decoder(ss,c0)
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! Decoder for JT9.
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parameter (NMAX=1800*12000) !Total sample intervals per 30 minutes
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parameter (NDMAX=1800*1500) !Sample intervals at 1500 Hz rate
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parameter (NSMAX=22000) !Max length of saved spectra
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real ss(184,NSMAX)
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character*22 msg
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character*33 line
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character*80 fmt,fmt14
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character*20 datetime
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real*4 ccfred(NSMAX)
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integer*1 i1SoftSymbols(207)
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integer*2 id2
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integer ii(1)
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complex c0(NDMAX)
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complex c1(NDMAX)
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common/npar/nutc,ndiskdat,ntrperiod,nfqso,newdat,npts8,nfa,nfb,ntol, &
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kin,nzhsym,nsave,nagain,ndepth,nrxlog,nfsample,datetime
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common/tracer/limtrace,lu
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save
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call timer('decoder ',0)
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ntrMinutes=ntrperiod/60
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newdat=1
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nsynced=0
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ndecoded=0
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limit=200
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if(ndepth.ge.2) limit=2000
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if(ndepth.ge.3) limit=20000
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nsps=0
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if(ntrMinutes.eq.1) then
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nsps=6912
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df3=1500.0/2048.0
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fmt='(i4.4,i4,i5,f6.1,f8.0,f6.1,3x,a22)'
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fmt14='(i4.4,i4,i5,f6.1,f8.0,f6.1,i3,i8,3x,a22)'
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else if(ntrMinutes.eq.2) then
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nsps=15360
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df3=1500.0/2048.0
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fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)'
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fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i3,i8,3x,a22)'
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else if(ntrMinutes.eq.5) then
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nsps=40960
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df3=1500.0/6144.0
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fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)'
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fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i3,i8,3x,a22)'
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else if(ntrMinutes.eq.10) then
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nsps=82944
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df3=1500.0/12288.0
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fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
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fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i3,i8,3x,a22)'
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else if(ntrMinutes.eq.30) then
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nsps=252000
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df3=1500.0/32768.0
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fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
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fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i3,i8,3x,a22)'
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endif
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if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code###
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kstep=nsps/2
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tstep=kstep/12000.0
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call timer('sync9 ',0)
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call sync9(ss,nzhsym,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk) !Compute ccfred
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call timer('sync9 ',1)
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! open(13,file='decoded.txt',status='unknown')
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! rewind 13
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if(iand(nRxLog,2).ne.0) rewind 14
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if(iand(nRxLog,1).ne.0) then
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! Write date and time to lu 14
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endif
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nRxLog=0
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fgood=0.
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nsps8=nsps/8
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df8=1500.0/nsps8
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sbest=0.
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10 ii=maxloc(ccfred(ia:ib))
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i=ii(1) + ia - 1
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f=(i-1)*df3
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if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. abs(f-fgood).gt.10.0*df8) then
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! call timer('spec9 ',0)
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! call spec9(c0,npts8,nsps,f,fpk,xdt,snr,i1SoftSymbols)
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! call timer('spec9 ',1)
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call timer('test9 ',0)
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fpk=1000.0 + df3*(i-1)
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c1(1:npts8)=conjg(c0(1:npts8))
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call test9(c1,npts8,nsps8,fpk,syncpk,snrdb,xdt,freq,drift,i1SoftSymbols)
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call timer('test9 ',1)
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call timer('decode9 ',0)
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call decode9(i1SoftSymbols,limit,nlim,msg)
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call timer('decode9 ',1)
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sync=(syncpk-1.0)/2.0
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if(sync.lt.0.0) sync=0.0
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nsync=sync
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if(nsync.gt.10) nsync=10
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nsnr=nint(snrdb)
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if(sync.gt.sbest .and. fgood.eq.0.0) then
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sbest=sync
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write(line,fmt) nutc,nsync,nsnr,xdt,freq,drift
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if(nsync.gt.0) nsynced=1
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endif
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if(msg.ne.' ') then
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write(*,fmt) nutc,nsync,nsnr,xdt,freq,drift,msg
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write(14,fmt14) nutc,nsync,nsnr,xdt,freq,drift,ntrMinutes,nlim,msg
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fgood=f
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nsynced=1
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ndecoded=1
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ccfred(max(ia,i-3):min(ib,i+11))=0.
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endif
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endif
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ccfred(i)=0.
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if(maxval(ccfred(ia:ib)).gt.3.0) go to 10
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if(fgood.eq.0.0) then
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write(*,1020) line
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write(14,1020) line
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1020 format(a33)
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endif
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write(*,1010) nsynced,ndecoded
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1010 format('<DecodeFinished>',2i4)
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flush(6)
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call flush(6)
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call flush(14)
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call timer('decoder ',1)
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if(nstandalone.eq.0) call timer('decoder ',101)
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return
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end subroutine decoder
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