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https://github.com/saitohirga/WSJT-X.git
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f398495cfc
The decoded message processing relies on fixed column positions so the extra character used in message averaging to indicate sync flips must also be allowed for in other modes. This is done by inserting a space character. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6681 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
192 lines
5.8 KiB
Fortran
192 lines
5.8 KiB
Fortran
subroutine fast9(id2,narg,line)
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! Decoder for "fast9" modes, JT9E to JT9H.
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parameter (NMAX=30*12000,NSAVE=500)
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integer*2 id2(0:NMAX)
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integer narg(0:14)
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integer*1 i1SoftSymbols(207)
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integer*1 i1save(207,NSAVE)
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integer indx(NSAVE)
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integer*8 count0,count1,clkfreq
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real s1(720000) !To reserve space. Logically s1(nq,jz)
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real s2(240,340) !Symbol spectra at quarter-symbol steps
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real ss2(0:8,85) !Folded symbol spectra
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real ss3(0:7,69) !Folded spectra without sync symbols
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real s(1500)
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real ccfsave(NSAVE)
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real t0save(NSAVE)
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real t1save(NSAVE)
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real freqSave(NSAVE)
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real t(6)
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character*22 msg !Decoded message
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character*80 line(100)
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data nsubmode0/-1/,ntot/0/
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save s1,nsubmode0,ntot
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! Parameters from GUI are in narg():
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nutc=narg(0) !UTC
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npts=min(narg(1),NMAX) !Number of samples in id2 (12000 Hz)
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nsubmode=narg(2) !0=A 1=B 2=C 3=D 4=E 5=F 6=G 7=H
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if(nsubmode.lt.4) go to 900
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newdat=narg(3) !1==> new data, compute symbol spectra
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minsync=narg(4) !Lower sync limit
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npick=narg(5)
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t0=0.001*narg(6)
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t1=0.001*narg(7)
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maxlines=narg(8) !Max # of decodes to return to caller
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nmode=narg(9)
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nrxfreq=narg(10) !Targer Rx audio frequency (Hz)
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ntol=narg(11) !Search range, +/- ntol (Hz)
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tmid=npts*0.5/12000.0
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line(1:100)(1:1)=char(0)
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s=0
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s2=0
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nsps=60 * 2**(7-nsubmode) !Samples per sysbol
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nfft=2*nsps !FFT size
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nh=nfft/2
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nq=nfft/4
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istep=nsps/4 !Symbol spectra at quarter-symbol steps
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jz=npts/istep
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df=12000.0/nfft !FFT bin width
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db1=db(2500.0/df)
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nfa=max(200,nrxfreq-ntol) !Lower frequency limit
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nfb=min(nrxfreq+ntol,2500) !Upper frequency limit
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nline=0
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t=0.
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if(newdat.eq.1 .or. nsubmode.ne.nsubmode0) then
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call system_clock(count0,clkfreq)
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call spec9f(id2,npts,nsps,s1,jz,nq) !Compute symbol spectra, s1
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call system_clock(count1,clkfreq)
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t(1)=t(1)+float(count1-count0)/float(clkfreq)
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endif
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nsubmode0=nsubmode
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tmsg=nsps*85.0/12000.0
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limit=2000
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nlen0=0
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i1=0
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i2=0
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ccfsave=0.
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do ilength=1,14
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nlen=1.4142136**(ilength-1)
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if(nlen.gt.jz/340) nlen=jz/340
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if(nlen.eq.nlen0) cycle
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nlen0=nlen
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db0=db(float(nlen))
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jlen=nlen*340
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jstep=jlen/4 !### Is this about right? ###
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if(nsubmode.ge.6) jstep=jlen/2
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do ja=1,jz-jlen,jstep
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jb=ja+jlen-1
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call system_clock(count0,clkfreq)
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call foldspec9f(s1,nq,jz,ja,jb,s2) !Fold symbol spectra into s2
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call system_clock(count1,clkfreq)
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t(2)=t(2)+float(count1-count0)/float(clkfreq)
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! Find sync; put sync'ed symbol spectra into ss2 and ss3
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! Might want to do a peakup in DT and DF, then re-compute symbol spectra.
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call system_clock(count0,clkfreq)
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call sync9f(s2,nq,nfa,nfb,ss2,ss3,lagpk,ipk,ccfbest)
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call system_clock(count1,clkfreq)
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t(3)=t(3)+float(count1-count0)/float(clkfreq)
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i1=i1+1
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if(ccfbest.lt.30.0) cycle
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call system_clock(count0,clkfreq)
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call softsym9f(ss2,ss3,i1SoftSymbols) !Compute soft symbols
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call system_clock(count1,clkfreq)
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t(4)=t(4)+float(count1-count0)/float(clkfreq)
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i2=i2+1
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ccfsave(i2)=ccfbest
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i1save(1:207,i2)=i1SoftSymbols
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t0=(ja-1)*istep/12000.0
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t1=(jb-1)*istep/12000.0
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t0save(i2)=t0
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t1save(i2)=t1
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freq=ipk*df
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freqSave(i2)=freq
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enddo
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enddo
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nsaved=i2
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ccfsave(1:nsaved)=-ccfsave(1:nsaved)
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call system_clock(count0,clkfreq)
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indx=0
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call indexx(ccfsave,nsaved,indx)
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call system_clock(count1,clkfreq)
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t(5)=t(5)+float(count1-count0)/float(clkfreq)
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ccfsave(1:nsaved)=-ccfsave(1:nsaved)
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do iter=1,2
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! do isave=1,nsaved
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do isave=1,50
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i2=indx(isave)
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if(i2.lt.1 .or. i2.gt.nsaved) cycle !### Why needed? ###
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t0=t0save(i2)
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t1=t1save(i2)
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if(iter.eq.1 .and. t1.lt.tmid) cycle
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if(iter.eq.2 .and. t1.ge.tmid) cycle
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ccfbest=ccfsave(i2)
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i1SoftSymbols=i1save(1:207,i2)
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freq=freqSave(i2)
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call system_clock(count0,clkfreq)
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call jt9fano(i1SoftSymbols,limit,nlim,msg) !Invoke Fano decoder
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call system_clock(count1,clkfreq)
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t(6)=t(6)+float(count1-count0)/float(clkfreq)
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i=t0*12000.0
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kz=(t1-t0)/0.02
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smax=0.
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do k=1,kz
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sq=0.
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do n=1,240
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i=i+1
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x=id2(i)
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sq=sq+x*x
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enddo
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s(k)=sq/240.
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smax=max(s(k),smax)
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enddo
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call pctile(s,kz,35,base)
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snr=smax/(1.1*base) - 1.0
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nsnr=-20
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if(snr.gt.0.0) nsnr=nint(db(snr))
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! write(72,3002) nutc,iter,isave,nlen,tmid,t0,t1,ccfbest, &
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! nint(freq),nlim,msg
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!3002 format(i6.6,i1,i4,i3,4f6.1,i5,i7,1x,a22)
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if(msg.ne.' ') then
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! Display multiple decodes only if they differ:
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do n=1,nline
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if(index(line(n),msg).gt.1) go to 100
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enddo
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!### Might want to use decoded message to get a complete estimate of S/N.
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nline=nline+1
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write(line(nline),1000) nutc,nsnr,t0,nint(freq),msg,char(0)
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1000 format(i6.6,i4,f5.1,i5,1x,'@ ',1x,a22,a1)
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ntot=ntot+1
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! write(70,5001) nsaved,isave,nline,maxlines,ntot,nutc,msg
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!5001 format(5i5,i7.6,1x,a22)
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if(nline.ge.maxlines) go to 900
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endif
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100 continue
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enddo
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enddo
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900 continue
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! write(*,6001) t,t(6)/sum(t)
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!6001 format(7f10.3)
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return
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end subroutine fast9
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