WSJT-X/lib/jt9.f90
Joe Taylor dac3e3d8a0 Fine-tuning work on decoder.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3181 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2013-04-16 18:33:38 +00:00

132 lines
3.3 KiB
Fortran

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 ccfred(NSMAX)
logical*1 lstrong(0:1023)
integer*1 i1SoftSymbols(207)
character*22 msg
character*33 line
integer*2 id2
complex c0
complex c1(NDMAX)
common/jt9com/ss(184,NSMAX),savg(NSMAX),c0(NDMAX),id2(NMAX),nutc,ndiskdat, &
ntr,mousefqso,newdat,nfa,nfb,ntol,kin,nzhsym,nsynced,ndecoded
common/tracer/limtrace,lu
nargs=iargc()
if(nargs.lt.1) then
print*,'Usage: jt9 TRperiod ndepth 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
call jt9a
! call ftnquit
go to 999
endif
read(arg,*) ntrperiod
call getarg(2,arg)
read(arg,*) ndepth
ifile1=3
limtrace=0
lu=12
nfa=1000
nfb=2000
ntol=500
nfqso=1500
newdat=1
nb=0
nbslider=30
limit=20000
ndiskdat=1
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) then
nsps=6912
nzhsym=173
else if(ntrperiod.eq.2) then
nsps=15360
nzhsym=178
else if(ntrperiod.eq.5) then
nsps=40960
nzhsym=172
else if(ntrperiod.eq.10) then
nsps=82944
nzhsym=171
else if(ntrperiod.eq.30) then
nsps=252000
nzhsym=167
endif
if(nsps.eq.0) stop 'Error: bad TRperiod'
kstep=nsps/2
tstep=kstep/12000.0
k=0
nhsym0=-999
npts=(60*ntrperiod-6)*12000
if(ifile.eq.ifile1) then
open(12,file='timer.out',status='unknown')
call timer('jt9 ',0)
endif
! do i=1,npts
! id2(i)=100.0*sin(6.283185307*1600.0*i/12000.0)
! enddo
do iblk=1,npts/kstep
k=iblk*kstep
call timer('read_wav',0)
read(10,end=10) id2(k-kstep+1:k)
call timer('read_wav',1)
nhsym=(k-2048)/kstep
if(nhsym.ge.1 .and. nhsym.ne.nhsym0) then
! Emit signal readyForFFT
ingain=0
call timer('symspec ',0)
call symspec(k,ntrperiod,nsps,ingain,nb,nbslider,pxdb, &
s,ccfred,df3,ihsym,nzap,slimit,lstrong,npts8)
call timer('symspec ',1)
nhsym0=nhsym
if(ihsym.ge.173) go to 10
endif
enddo
10 close(10)
call fillcom(nutc0,ndepth)
call decoder(ss,c0,1)
enddo
call timer('jt9 ',1)
call timer('jt9 ',101)
go to 999
998 print*,'Cannot open file:'
print*,infile
999 end program jt9