mirror of https://github.com/saitohirga/WSJT-X.git
150 lines
3.8 KiB
Fortran
150 lines
3.8 KiB
Fortran
subroutine decoder(ntrSeconds,ndepth,nRxLog,c00)
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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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character*22 msg
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character*33 line
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character*80 fmt,fmt14
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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),c00(NDMAX)
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common/jt9com/ss0(184,NSMAX),savg(NSMAX),id2(NMAX),nutc0,ndiskdat, &
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ntr,nfqso,newdat,npts80,nfb,ntol,kin,nzhsym,nsynced,ndecoded
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common/jt9comB/ss(184,NSMAX),c0
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common/tracer/limtrace,lu
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logical first
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data first/.true./
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save
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if(first) then
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limtrace=0
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lu=12
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open(12,file='timer.out',status='unknown')
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open(14,file='wsjtx_rx.log',status='unknown',position='append')
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first=.false.
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endif
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call timer('decoder ',0)
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if(newdat.ne.0) then
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ss=ss0
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c0=c00
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nutc=nutc0
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npts8=npts80
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endif
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ntrMinutes=ntrSeconds/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,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,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,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,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,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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df8=1500.0/(nsps/8)
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sbest=0.
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10 continue
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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('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=ccfred(i) - 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(snr)
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drift=0.0
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if(ccfred(i).gt.sbest .and. fgood.eq.0.0) then
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sbest=ccfred(i)
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write(line,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,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(13,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,msg
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write(14,fmt14) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,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):min(ib,i+8))=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(13,1020) 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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call flush(13)
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call flush(14)
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close(13)
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call timer('decoder ',1)
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call timer('decoder ',101)
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return
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end subroutine decoder
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