mirror of https://github.com/saitohirga/WSJT-X.git
145 lines
3.8 KiB
Fortran
145 lines
3.8 KiB
Fortran
program jt9
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! Decoder for JT9. Can run stand-alone, reading data from *.wav files;
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! or as the back end of wsjt-x, with data placed in a shared memory region.
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! NB: For unknown reason, ***MUST*** be compiled by g95 with -O0 !!!
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character*80 arg,infile
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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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integer*4 ihdr(11)
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real*4 s(NSMAX)
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real*4 ccfred(NSMAX)
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logical*1 lstrong(0:1023)
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integer*1 i1SoftSymbols(207)
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character*22 msg
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character*33 line
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integer*2 id2
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complex c0(NDMAX)
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common/jt9com/ss(184,NSMAX),savg(NSMAX),id2(NMAX),nutc,ndiskdat, &
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ntr,mousefqso,newdat,nfa,nfb,ntol,kin
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: jt9 TRperiod file1 [file2 ...]'
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print*,' Reads data from *.wav files.'
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print*,''
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print*,' jt9 -s'
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print*,' Gets data from shared memory region.'
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go to 999
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endif
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call getarg(1,arg)
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if(arg(1:2).eq.'-s') go to 999
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read(arg,*) ntrperiod
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ifile1=2
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nfa=1000
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nfb=2000
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! ntol=500
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ntol=500
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nfqso=1500
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newdat=1
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nb=0
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nbslider=100
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limit=20000
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do ifile=ifile1,nargs
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call getarg(ifile,infile)
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open(10,file=infile,access='stream',status='old',err=998)
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read(10) ihdr
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i1=index(infile,'.wav')
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read(infile(i1-4:i1-1),*,err=1) nutc0
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go to 2
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1 nutc0=0
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2 nsps=0
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if(ntrperiod.eq.1) nsps=6912
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if(ntrperiod.eq.2) nsps=15360
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if(ntrperiod.eq.5) nsps=40960
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if(ntrperiod.eq.10) nsps=82944
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if(ntrperiod.eq.30) nsps=252000
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if(nsps.eq.0) stop 'Error: bad TRperiod'
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kstep=nsps/2
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tstep=kstep/12000.0
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k=0
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nhsym0=-999
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npts=(60*ntrperiod-6)*12000
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! do i=1,npts
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! id2(i)=100.0*sin(6.283185307*1046.875*i/12000.0)
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! enddo
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do iblk=1,npts/kstep
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k=iblk*kstep
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read(10,end=10) id2(k-kstep+1:k)
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nhsym=(k-2048)/kstep
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if(nhsym.ge.1 .and. nhsym.ne.nhsym0) then
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! Emit signal readyForFFT
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ingain=0
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call symspec(k,ntrperiod,nsps,ingain,nb,nbslider,pxdb, &
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s,ccfred,df3,ihsym,nzap,slimit,lstrong,c0,npts8)
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nhsym0=nhsym
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if(ihsym.ge.184) go to 10
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endif
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enddo
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10 close(10)
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iz=1000.0/df3
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! Now do the decoding
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nutc=nutc0
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! Get sync, approx freq
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call sync9(ss,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk)
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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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do i=ia,ib
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f=(i-1)*df3
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if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. f.gt.fgood+10.0*df8) then
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call spec9(c0,npts8,nsps,f,fpk,xdt,snrdb,i1SoftSymbols)
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call decode9(i1SoftSymbols,limit,nlim,msg)
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! print*,msg
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! snr=10.0*log10(ccfred(i)) - 10.0*log10(2500.0/df3) + 2.0
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snr=snrdb
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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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width=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,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width
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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(*,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width,msg
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1010 format(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)
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fgood=f
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nsynced=1
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ndecoded=1
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endif
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endif
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enddo
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if(fgood.eq.0.0) then
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write(*,1020) line
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1020 format(a33)
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endif
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enddo
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go to 999
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998 print*,'Cannot open file:'
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print*,infile
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999 end program jt9
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