2012-10-27 10:09:34 -04:00
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subroutine decoder(ntrSeconds,nRxLog,c0)
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2012-10-15 17:06:15 -04:00
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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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2012-10-20 16:52:29 -04:00
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real*4 ccfred(NSMAX)
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2012-10-15 17:06:15 -04:00
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integer*1 i1SoftSymbols(207)
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integer*2 id2
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2012-10-16 19:32:15 -04:00
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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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2012-10-19 15:26:07 -04:00
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ntr,nfqso,nagain,newdat,npts8,nfb,ntol,kin
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2012-10-26 12:52:04 -04:00
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logical first
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data first/.true./
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save
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2012-10-15 17:06:15 -04:00
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ntrMinutes=ntrSeconds/60
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newdat=1
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nsps=0
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2012-10-20 13:25:46 -04:00
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if(ntrMinutes.eq.1) then
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nsps=6912
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df3=1500.0/2048.0
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else if(ntrMinutes.eq.2) then
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2012-10-15 17:06:15 -04:00
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nsps=15360
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2012-10-20 13:25:46 -04:00
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df3=1500.0/2048.0
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else if(ntrMinutes.eq.5) then
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nsps=40960
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df3=1500.0/6144.0
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else if(ntrMinutes.eq.10) then
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nsps=82944
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df3=1500.0/12288.0
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else if(ntrMinutes.eq.30) then
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nsps=252000
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df3=1500.0/32768.0
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2012-10-15 17:06:15 -04:00
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endif
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2012-10-20 13:25:46 -04:00
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if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code###
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2012-10-15 17:06:15 -04:00
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! Now do the decoding
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2012-10-19 15:26:07 -04:00
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kstep=nsps/2
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2012-10-16 19:32:15 -04:00
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tstep=kstep/12000.0
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2012-10-15 17:06:15 -04:00
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! Get sync, approx freq
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2012-10-20 16:52:29 -04:00
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call sync9(ss,tstep,df3,ntol,nfqso,sync,snr,fpk0,ccfred)
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call spec9(c0,npts8,nsps,fpk0,fpk,xdt,i1SoftSymbols)
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2012-10-15 17:06:15 -04:00
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call decode9(i1SoftSymbols,msg)
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2012-10-20 16:52:29 -04:00
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nsync=sync
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2012-10-24 15:44:29 -04:00
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nsnr=nint(snr)
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width=0.0
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2012-10-26 12:52:04 -04:00
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open(13,file='decoded.txt',status='unknown')
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rewind 13
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2012-10-24 15:44:29 -04:00
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write(13,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width,msg
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1010 format(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)
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2012-10-19 15:26:07 -04:00
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call flush(13)
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close(13)
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2012-10-26 12:52:04 -04:00
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if(first) then
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open(14,file='wsjtx_rx.log',status='unknown',position='append')
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first=.false.
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endif
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2012-10-27 10:09:34 -04:00
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if(iand(nRxLog,2).ne.0) rewind 14
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if(iand(nRxLog,1).ne.0) then
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! Write date and time to lu 14
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endif
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2012-10-26 12:52:04 -04:00
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write(14,1010) nutc,nsync,nsnr,xdt,1000.0+fpk,width,msg
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call flush(14)
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2012-10-15 17:06:15 -04:00
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return
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end subroutine decoder
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