WSJT-X/libm65/encode232.f90
Joe Taylor f8c1b6ed23 Soundout is now working (or at least making noise) with JTMS3 waveforms.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/jtms3@2479 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2012-07-03 19:43:26 +00:00

34 lines
800 B
Fortran

subroutine encode232(dat,nsym,symbol)
! Convolutional encoder for a K=32, r=1/2 code.
integer*1 dat(13) !User data, packed 8 bits per byte
integer*1 symbol(500) !Channel symbols, one bit per byte
integer*1 i1
include 'conv232.f90'
nstate=0
k=0
do j=1,nsym
do i=7,0,-1
i1=dat(j)
i4=i1
if (i4.lt.0) i4=i4+256
nstate=ior(ishft(nstate,1),iand(ishft(i4,-i),1))
n=iand(nstate,npoly1)
n=ieor(n,ishft(n,-16))
k=k+1
symbol(k)=partab(iand(ieor(n,ishft(n,-8)),255))
n=iand(nstate,npoly2)
n=ieor(n,ishft(n,-16))
k=k+1
symbol(k)=partab(iand(ieor(n,ishft(n,-8)),255))
if(k.ge.nsym) go to 100
enddo
enddo
100 continue
return
end subroutine encode232