WSJT-X/libm65/jt9.f90
Joe Taylor 8970a140e0 Working toward decode capability.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2628 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2012-10-02 18:08:44 +00:00

127 lines
3.2 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)
logical*1 lstrong(0:1023)
integer*2 id2
complex c0
common/jt8com/id2(NMAX),ss(184,NSMAX),savg(NSMAX),c0(NDMAX), &
nutc,npts8,junk(20)
common/tracer/limtrace,lu
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
! call jt9a
! call ftnquit
go to 999
endif
read(arg,*) ntrperiod
ifile1=2
limtrace=0
lu=12
call timer('jt9 ',0) !###
nfa=1000
nfb=2000
ntol=500
mousedf=0
mousefqso=1500
newdat=1
nb=0
nbslider=100
! call ftninit('.')
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
call timer('read_wav',0)
read(10) id2(1:npts)
call timer('read_wav',1)
! do i=1,npts
! id2(i)=100.0*sin(6.283185307*1046.875*i/12000.0)
! enddo
! if(ifile.eq.ifile1) call timer('jt9 ',0)
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 timer('symspec ',0)
call symspecx(k,ntrperiod,nsps,ndiskdat,nb,nbslider,pxdb, &
s,f0a,df3,ihsym,nzap,slimit,lstrong)
call timer('symspec ',1)
nhsym0=nhsym
if(ihsym.ge.184) go to 10
endif
enddo
10 continue
do i=0,512
if(lstrong(i)) print*,'Strong signal at ',12000.0*i/1024.0
enddo
nz=1000.0/df3
do i=1,nz
freq=f0a + (i-1)*df3
write(78,3001) i,freq,savg(i)
3001 format(i8,2f12.3)
enddo
nutc=nutc0
nstandalone=1
call sync9(ss,tstep,f0a,df3,lagpk,fpk)
call spec9(c0,npts8,nsps,f0a,lagpk,fpk)
! call decode0(dd,ss,savg,nstandalone,nfsample)
enddo
call timer('jt9 ',1)
call timer('jt9 ',101)
! call ftnquit
go to 999
998 print*,'Cannot open file:'
print*,infile
999 end program jt9