WSJT-X/lib/decoder.f90

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subroutine decoder(ntrSeconds,c0)
! 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 !!!
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
character*22 msg
real*4 red(NSMAX)
integer*1 i1SoftSymbols(207)
integer*2 id2
complex c0(NDMAX)
common/jt9com/ss(184,NSMAX),savg(NSMAX),id2(NMAX),nutc,ndiskdat, &
ntr,mousefqso,nagain,newdat,nfa,nfb,ntol,kin
ntrMinutes=ntrSeconds/60
newdat=1
nb=0
nbslider=100
nsps=0
if(ntrMinutes.eq.1) nsps=6912
if(ntrMinutes.eq.2) then
nsps=15360
df3=0.7324219
endif
if(ntrMinutes.eq.5) nsps=40960
if(ntrMinutes.eq.10) nsps=82944
if(ntrMinutes.eq.30) nsps=252000
if(nsps.eq.0) stop 'Error: bad TRperiod'
! Now do the decoding
nutc=0
tstep=kstep/12000.0
ntol=500
nfqso=1500
! Get sync, approx freq
call sync9(ss,tstep,df3,ntol,nfqso,sync,fpk,red)
npts8=170880 !### TEST ONLY ###
call spec9(c0,npts8,nsps,fpk,xdt,i1SoftSymbols)
call decode9(i1SoftSymbols,msg)
open(73,file='decoded.txt',status='unknown')
rewind 73
! write(*,1010) nutc,sync,xdt,1000.0+fpk,msg
write(73,1010) nutc,sync,xdt,1000.0+fpk,msg
1010 format(i4.4,3f7.1,2x,a22)
call flush(73)
close(73)
return
end subroutine decoder