Experimenting with a slow MSK144 mode.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7704 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

lib/makepings.f90

@@ -9,13 +9,12 @@ subroutine makepings(pings,npts,width,sig)
   do i=1,14
      t0(i)=i                            !Make pings at t=1, 2, ... 14 s.
   enddo
-  w=width
   amp=sig
 
   do i=1,npts
      iping=min(max(1,i/12000),14)
-     t=(i*dt-t0(iping))/w
+     t=(i*dt-t0(iping))/width
-     if(t.lt.0.d0 .and. t.lt.10.0) then
+     if(t.lt.0.d0 .and. t.lt.10.0) then    !????
         fac=0.
      else
         fac=2.718*t*dexp(-t)

lib/msk144sim.f90

@@ -15,10 +15,10 @@ program msk144sim
   data mygrid/"EN50wc"/
 
   nargs=iargc()
-  if(nargs.ne.5) then
+  if(nargs.ne.6) then
-     print*,'Usage:    msk144sim        message       freq width snr nfiles'
+     print*,'Usage:   msk144sim       message       freq width nfac snr nfiles'
-     print*,' '
+     print*,'Example: msk144sim "K1ABC W9XYZ EN37"  1500  0.12   1   2    1'
-     print*,'Example: msk144sim  "K1ABC W9XYZ EN37"  1500  0.12  2   1'
+     print*,'         msk144sim "K1ABC W9XYZ EN37"  1500  2.5   32  -15   1'
      go to 999
   endif
   call getarg(1,msg)
@@ -27,8 +27,10 @@ program msk144sim
   call getarg(3,arg)
   read(arg,*) width
   call getarg(4,arg)
-  read(arg,*) snrdb
+  read(arg,*) nfac
   call getarg(5,arg)
+  read(arg,*) snrdb
+  call getarg(6,arg)
   read(arg,*) nfiles
 
 !sig is the peak amplitude of the ping. 
@@ -42,12 +44,15 @@ program msk144sim
   twopi=8.d0*atan(1.d0)
 
   nsym=144
+  nsps=6*nfac
   if( itone(41) .lt. 0 ) nsym=40
-  dphi0=twopi*(freq-500)/12000.0
+  baud=2000.d0/nfac
-  dphi1=twopi*(freq+500)/12000.0
+  dphi0=twopi*(freq-0.25d0*baud)/12000.d0
+  dphi1=twopi*(freq+0.25d0*baud)/12000.d0
   phi=0.0
-  indx=0
+  k=0
-  nreps=NMAX/(nsym*6)
+  nreps=NMAX/(nsym*nsps)
+  print*,nsym,nfac,nsps,baud,freq
   do jrep=1,nreps
     do i=1,nsym
       if( itone(i) .eq. 0 ) then
@@ -55,9 +60,9 @@ program msk144sim
       else
         dphi=dphi1
       endif
-      do j=1,6  
+      do j=1,nsps
-        waveform(indx)=cos(phi);
+        waveform(k)=cos(phi)
-        indx=indx+1
+        k=k+1
         phi=mod(phi+dphi,twopi)
       enddo 
     enddo
@@ -68,7 +73,7 @@ program msk144sim
      go to 999
   endif
 
-  call makepings(pings,NMAX,width,sig)
+  if(nfac.eq.1) call makepings(pings,NMAX,width,sig)
 
 !  call sgran()
   do ifile=1,nfiles                  !Loop over requested number of files
@@ -81,8 +86,8 @@ program msk144sim
      fac=sqrt(6000.0/2500.0)
      do i=0,NMAX-1
         xx=gran()
-        wave(i)=pings(i)*waveform(i) + fac*xx
+        if(nfac.eq.1) wave(i)=pings(i)*waveform(i) + fac*xx
-!        wave(i)=sig*waveform(i) + fac*xx
+        if(nfac.gt.1) wave(i)=sig*waveform(i) + fac*xx
         iwave(i)=30.0*wave(i)
      enddo