WSJT-X/lib/jt9.f90

115 lines
2.9 KiB
Fortran
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program jt9
! Decoder for JT9. Can run stand-alone, reading data from *.wav files;
! or as the back end of wsjt-x, with data placed in a shared memory region.
! NB: For unknown reason, ***MUST*** be compiled by g95 with -O0 !!!
character*80 arg,infile
parameter (NMAX=1800*12000) !Total sample intervals per 30 minutes
parameter (NDMAX=1800*1500) !Sample intervals at 1500 Hz rate
parameter (NSMAX=22000) !Max length of saved spectra
integer*4 ihdr(11)
real*4 s(NSMAX)
real*4 red(NSMAX)
logical*1 lstrong(0:1023)
integer*1 i1SoftSymbols(207)
character*22 msg
integer*2 id2
complex c0
common/jt9com/id2(NMAX),ss(184,NSMAX),savg(NSMAX),c0(NDMAX), &
nutc,npts8,junk(20)
nargs=iargc()
if(nargs.lt.1) then
print*,'Usage: jt9 TRperiod file1 [file2 ...]'
print*,' Reads data from *.wav files.'
print*,''
print*,' jt9 -s'
print*,' Gets data from shared memory region.'
go to 999
endif
call getarg(1,arg)
if(arg(1:2).eq.'-s') then
go to 999
endif
read(arg,*) ntrperiod
ifile1=2
nfa=1000
nfb=2000
ntol=500
nfqso=1500
newdat=1
nb=0
nbslider=100
do ifile=ifile1,nargs
call getarg(ifile,infile)
open(10,file=infile,access='stream',status='old',err=998)
read(10) ihdr
i1=index(infile,'.wav')
read(infile(i1-4:i1-1),*,err=1) nutc0
go to 2
1 nutc0=0
2 nsps=0
if(ntrperiod.eq.1) nsps=6912
if(ntrperiod.eq.2) nsps=15360
if(ntrperiod.eq.5) nsps=40960
if(ntrperiod.eq.10) nsps=82944
if(ntrperiod.eq.30) nsps=252000
if(nsps.eq.0) stop 'Error: bad TRprtiod'
kstep=nsps/2
tstep=kstep/12000.0
k=0
nhsym0=-999
npts=(60*ntrperiod-6)*12000
read(10) id2(1:npts)
! do i=1,npts
! id2(i)=100.0*sin(6.283185307*1046.875*i/12000.0)
! enddo
do iblk=1,npts/kstep
k=iblk*kstep
nhsym=(k-2048)/kstep
if(nhsym.ge.1 .and. nhsym.ne.nhsym0) then
! Emit signal readyForFFT
call symspec(k,ntrperiod,nsps,ndiskdat,nb,nbslider,pxdb, &
s,red,df3,ihsym,nzap,slimit,lstrong)
nhsym0=nhsym
if(ihsym.ge.184) go to 10
endif
enddo
10 continue
! Now do the decoding
nutc=nutc0
! Get sync, approx freq
call sync9(ss,tstep,f0a,df3,ntol,nfqso,sync,fpk,red)
fpk0=fpk
! iz=1000.0/df3
! do i=1,iz
! freq=1000.0 + (i-1)*df3
! write(72,3001) freq,red(i),db(red(i))
!3001 format(3f10.3)
! enddo
! flush(72)
call spec9(c0,npts8,nsps,f0a,fpk,xdt,i1SoftSymbols)
call decode9(i1SoftSymbols,msg)
write(*,1010) nutc,xdt,1000.0+fpk,msg,sync,fpk0
1010 format(i4.4,f6.1,f7.1,2x,a22,2f9.1)
enddo
go to 999
998 print*,'Cannot open file:'
print*,infile
999 end program jt9