mirror of https://github.com/saitohirga/WSJT-X.git
183 lines
4.7 KiB
Fortran
183 lines
4.7 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
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complex c1(NDMAX)
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common/jt9com/ss(184,NSMAX),savg(NSMAX),c0(NDMAX),id2(NMAX),nutc,ndiskdat, &
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ntr,mousefqso,newdat,nfa,nfb,ntol,kin,nzhsym,nsynced,ndecoded
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common/tracer/limtrace,lu
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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') then
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call jt9a
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! call ftnquit
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go to 999
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endif
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read(arg,*) ntrperiod
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ifile1=2
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limtrace=0
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lu=12
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nfa=1000
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nfb=2000
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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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ndiskdat=1
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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) then
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nsps=6912
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nzhsym=181
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else if(ntrperiod.eq.2) then
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nsps=15360
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nzhsym=178
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else if(ntrperiod.eq.5) then
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nsps=40960
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nzhsym=172
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else if(ntrperiod.eq.10) then
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nsps=82944
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nzhsym=171
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else if(ntrperiod.eq.30) then
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nsps=252000
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nzhsym=167
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endif
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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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if(ifile.eq.ifile1) then
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open(12,file='timer.out',status='unknown')
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call timer('jt9 ',0)
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endif
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! do i=1,npts
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! id2(i)=100.0*sin(6.283185307*1600.0*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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call timer('read_wav',0)
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read(10,end=10) id2(k-kstep+1:k)
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call timer('read_wav',1)
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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 timer('symspec ',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,npts8)
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call timer('symspec ',1)
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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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nutc=nutc0
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call timer('sync9 ',0)
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call sync9(ss,nzhsym,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk) !Get sync, freq
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call timer('sync9 ',1)
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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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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 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, &
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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,1010) 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(*,1010) nutc,nsync,nsnr,xdt,freq,drift,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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call timer('jt9 ',1)
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call timer('jt9 ',101)
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! call ftnquit
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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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