More-or-less functional decoder for JTMSK short messages.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6419 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

lib/fast9.f90

@@ -4,7 +4,7 @@ subroutine fast9(id2,narg,line)
 
   parameter (NMAX=30*12000,NSAVE=500)
   integer*2 id2(0:NMAX)
-  integer narg(0:11)
+  integer narg(0:13)
   integer*1 i1SoftSymbols(207)
   integer*1 i1save(207,NSAVE)
   integer indx(NSAVE)

lib/fast_decode.f90

@@ -2,7 +2,7 @@ subroutine fast_decode(id2,narg,line)
 
   parameter (NMAX=30*12000)
   integer*2 id2(NMAX)
-  integer narg(0:9)
+  integer narg(0:13)
   real dat(30*12000)
   complex cdat(262145),cdat2(262145)
   real psavg(450)
@@ -21,8 +21,9 @@ subroutine fast_decode(id2,narg,line)
   t1=0.001*narg(7)
   maxlines=narg(8)
   nmode=narg(9)
-
+  nrxfreq=narg(10)
-!  call sleep_msec(100)                       !### TEMPORARY ###
+  ntol=narg(11)
+  nhashcalls=narg(12)
 
   if(nmode.eq.102) then
      call fast9(id2,narg,line)
@@ -45,7 +46,6 @@ subroutine fast_decode(id2,narg,line)
 ! NB: npts, nsps, etc., are all reduced by 9/32
 
   write(cfile6,'(i6.6)') nutc
-  ntol=400
   nfreeze=1
   mousedf=0
   mousebutton=0

lib/genmsk_short.f90

@@ -53,3 +53,14 @@ subroutine genmsk_short(msg,msgsent,ichk,itone,itype)
 
 900 return
 end subroutine genmsk_short
+
+subroutine hash_calls(calls,ih9)
+
+  use hashing
+  character*(*) calls
+  i1=index(calls,'>')
+  call hash(calls(2:i1-1),i1-2,ih9)
+  ih9=iand(ih9,511)                      !9-bit hash for the two callsigns
+
+  return
+end subroutine hash_calls

lib/jtmsk_decode.f90

@@ -15,9 +15,8 @@ subroutine jtmsk_decode(id2,narg,line)
   complex c(NFFTMAX)                   !Complex (analytic) data
   complex cdat(24000)                  !Short segments, up to 2 s
   complex cdat2(24000)
-  integer narg(0:11)                   !Arguments passed from calling pgm
+  integer narg(0:13)                   !Arguments passed from calling pgm
   character*22 msg,msg0                !Decoded message
-  character*22 msg1         !### Test ###
   character*80 line(100)               !Decodes passed back to caller
 
   limtrace=-1
@@ -33,7 +32,7 @@ subroutine jtmsk_decode(id2,narg,line)
   nmode=narg(9)
   nrxfreq=narg(10)                     !Target Rx audio frequency (Hz)
   ntol=narg(11)                        !Search range, +/- ntol (Hz)
-
+  nhashcalls=narg(12)
   nsnr0=-99
   nline=0
   line(1:100)(1:1)=char(0)
@@ -54,28 +53,6 @@ subroutine jtmsk_decode(id2,narg,line)
   call analytic(d,npts,nfft,c)         !Convert to analytic signal
   call timer('analytic',1)
 
-  msg1="<K1ABC W9XYZ> R26"
-  msg='                      '
-  call jtmsk_short(c,npts,msg1,msg)
-
-!### Needs work!
-  nsnr=1
-  if(msg.ne.'                      ') then
-     if(msg.ne.msg0) then
-        nline=nline+1
-        nsnr0=-99
-     endif
-     if(nsnr.gt.nsnr0) then
-!        call rectify_msk(cdat2(jpk:jpk+NSPM-1),msg,freq2)
-        write(line(nline),1020) nutc,nsnr,t0,nint(freq2),msg
-        nsnr0=nsnr
-        go to 900
-     endif
-     msg0=msg
-     if(nline.ge.maxlines) go to 900
-  endif
-!###
-
   nbefore=NSPM
   nafter=4*NSPM
 ! Process ping list (sorted by S/N) from top down.
@@ -124,7 +101,21 @@ subroutine jtmsk_decode(id2,narg,line)
      enddo
   enddo
 
-900 if(line(1)(1:6).eq.'      ') line(1)(1:1)=char(0)
+900 if(nline.eq.0) then
+     msg='                      '
+     call jtmsk_short(c,npts,narg,tbest,msg)
+
+!### Needs work!
+     if(msg.ne.'                      ') then
+        nline=nline+1
+        j=nint(12000.0*tbest/512.0)
+        nsnr=nint(yellow(j)-1.0)
+        write(line(nline),1020) nutc,nsnr,tbest,nrxfreq,msg
+     endif
+!###
+
+  endif
+  if(line(1)(1:6).eq.'      ') line(1)(1:1)=char(0)
 
   return
 end subroutine jtmsk_decode

lib/jtmsk_short.f90

@@ -1,37 +1,41 @@
-subroutine jtmsk_short(cdat,npts,msg,decoded)
+subroutine jtmsk_short(cdat,npts,narg,tbest,decoded)
 
   parameter (NMAX=15*12000,NSAVE=100)
   character*22 msg,decoded,msgsent
   character*3 rpt(0:7)
   complex cdat(0:npts-1)
-  complex cw(0:209,0:4096)                !Waveforms of possible messages
+  complex cw(0:209,0:4095)                !Waveforms of possible messages
   complex cb11(0:65)                      !Complex waveform of Barker 11
   complex z1,z2a,z2b
   real*8 dt,twopi,freq,phi,dphi0,dphi1,dphi
   real r1(0:NMAX-1)
-  real r2(0:4096)
+  real r2(0:4095)
   real r1save(NSAVE)
-!  integer*8 count0,count1,clkfreq
   integer itone(234)                      !Message bits
   integer jgood(NSAVE)
   integer indx(NSAVE)
+  integer narg(0:13)
   logical first
   data rpt /'26 ','27 ','28 ','R26','R27','R28','RRR','73 '/
-  data first/.true./
+  data first/.true./,nrxfreq0/-1/
-  save first,cw,cb11
+  save first,cw,cb11,nrxfreq0
 
-  if(first) then
+  nrxfreq=narg(10)                     !Target Rx audio frequency (Hz)
+  ntol=narg(11)                        !Search range, +/- ntol (Hz)
+  nhashcalls=narg(12)
+
+  if(first .or. nrxfreq.ne.nrxfreq0) then
      dt=1.d0/12000.d0
      twopi=8.d0*atan(1.d0)
-     freq=1500.d0
+     freq=nrxfreq
      dphi0=twopi*(freq-500.d0)*dt              !Phase increment, lower tone
      dphi1=twopi*(freq+500.d0)*dt              !Phase increment, upper tone
      nsym=35                                   !Number of symbols
      nspm=6*nsym                               !Samples per message
 
-     do imsg=0,4096                     !Generate all possible message waveforms
+     msg="<C1ALL C2ALL> 73"
-        ichk=0
+     do imsg=0,4095                     !Generate all possible message waveforms
-        if(imsg.lt.4096) ichk=10000+imsg
+        ichk=10000+imsg
         call genmsk(msg,ichk,msgsent,itone,itype) !Encode the message
         k=-1
         phi=0.d0
@@ -49,18 +53,12 @@ subroutine jtmsk_short(cdat,npts,msg,decoded)
      enddo
      cb11=cw(0:65,0)
      first=.false.
+     nrxfreq0=nrxfreq
   endif
 
-!  r1thresh=0.40
   r1thresh=0.80
-  r2thresh=0.50
-  rmax=0.9
-  ngood=0
-  nbad=0
   maxdecodes=999
 
-!  call system_clock(count0,clkfreq)
-
   r1max=0.
   do j=0,npts-210                         !Find the B11 sync vectors
      z1=0.
@@ -89,7 +87,8 @@ subroutine jtmsk_short(cdat,npts,msg,decoded)
   kmax=k
   call indexx(r1save,kmax,indx)
 
-  r2bad=0.
+  ibest2=-1
+  u1best=0.
   do kk=1,kmax
      k=indx(kmax+1-kk)
      j=jgood(k)
@@ -98,7 +97,7 @@ subroutine jtmsk_short(cdat,npts,msg,decoded)
      u2=0.
      r2max=0.
      ibest=-1
-     do imsg=0,4096
+     do imsg=0,4095
         ssa=0.
         ssb=0.
         do i=0,209
@@ -118,29 +117,35 @@ subroutine jtmsk_short(cdat,npts,msg,decoded)
            u1=r2max
         endif
      enddo
-     r1or2=r1(j)/r2max
+     r1_r2=r1(j)/r2max
-     if(r2max.ge.r2thresh .and. u2/u1.lt.rmax .and. r1or2.ge.0.91) then
+     t=j/12000.0
-        t=j/12000.0
+     n=0
-        n=0
+     if(ibest/8.eq.narg(12) .and. iand(ibest,7).eq.3) n=1
-        irpt=iand(ibest,7)
+!     write(52,3101) t,nrxfreq,ibest/8,n,r1(j),u1,u2,u2/u1,r1_r2
-        decoded="<...> "//rpt(irpt)
+!     flush(52)
-        if(r2max.eq.r2(4096)) then
+     if(u1.ge.0.75 .and. u2/u1.lt.0.9 .and. r1_r2.lt.1.11) then
-           n=1
+!        write(*,3101) t,nrxfreq,ibest/8,n,r1(j),u1,u2,u2/u1,r1_r2
-           decoded=msg(1:14)//rpt(irpt)
+        if(u1.gt.u1best) then
+           irpt=iand(ibest,7)
+           ihash=ibest/8
+           narg(13)=ihash
+           decoded="<...> "//rpt(irpt)
+           tbest=t
+           r1best=r1(j)
+           u1best=u1
+           u2best=u2
+           ibest2=ibest
+           r1_r2best=r1_r2
+           nn=0
+           if(ihash.eq.narg(12) .and. iand(ibest2,7).eq.3) nn=1
         endif
-        go to 900
-
-!        if(n.eq.0) nbad=nbad+1
-!        if(n.eq.1) ngood=ngood+1
-!        if(n.eq.0 .and. r2max.gt.r2bad) r2bad=r2max
-!        write(52,3020) k,t,ibest,r1(j),r2max,u2/u1,r1or2,n,decoded
-!3020    format(i3,f9.4,i5,4f7.2,i2,1x,a22)
-!        if(ngood+nbad.ge.maxdecodes) exit
      endif
   enddo
+!  if(r1best.gt.0.0) then
+!     write(*,3101) tbest,nrxfreq,ihash,nn,r1best,u1best,u2best,            &
+!          u2best/u1best,r1_r2best
+!3101 format(f7.2,3i6,5f8.2)
+!  endif
 
-!  print "('Worst false decode:',f6.3)",r2bad
+  return
-!  print "('Good:',i3,'   Bad:',i3)",ngood,nbad
-
-900 return
 end subroutine jtmsk_short