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https://github.com/saitohirga/WSJT-X.git
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67 lines
1.6 KiB
Fortran
67 lines
1.6 KiB
Fortran
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subroutine decoder(ntrSeconds)
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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
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common/jt9com/id2(NMAX),ss(184,NSMAX),savg(NSMAX),c0(NDMAX), &
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nutc,npts8,junk(20)
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ntrMinutes=ntrSeconds/60
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nfa=1000
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nfb=2000
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ntol=500
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mousedf=0
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mousefqso=1500
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newdat=1
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nb=0
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nbslider=100
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f0a=0.
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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=nutc0
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nstandalone=1
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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,f0a,df3,ntol,nfqso,sync,fpk,red)
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fpk0=fpk
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call spec9(c0,npts8,nsps,f0a,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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iutc=0
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write(*,1010) iutc,xdt,1000.0+fpk,msg,sync,fpk0
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write(73,1010) iutc,xdt,1000.0+fpk,msg,sync,fpk0
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1010 format(i4.4,f6.1,f7.1,2x,a22,2f9.1)
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flush(73)
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! close(13)
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return
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end subroutine decoder
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