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