mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-10-31 23:57:10 -04:00
f9d0a1863a
This merge brings the WSPR feature development into the main line ready for release in a future v1.6 release. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5424 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
46 lines
752 B
Fortran
46 lines
752 B
Fortran
subroutine inter_wspr(id,ndir)
|
|
|
|
! Interleave (ndir=1) or de-interleave (ndir=-1) the array id.
|
|
|
|
integer*1 id(0:161),itmp(0:161)
|
|
integer j0(0:161)
|
|
logical first
|
|
data first/.true./
|
|
save
|
|
|
|
if(first) then
|
|
! Compute the interleave table using bit reversal.
|
|
k=-1
|
|
do i=0,255
|
|
n=0
|
|
ii=i
|
|
do j=0,7
|
|
n=n+n
|
|
if(iand(ii,1).ne.0) n=n+1
|
|
ii=ii/2
|
|
enddo
|
|
if(n.le.161) then
|
|
k=k+1
|
|
j0(k)=n
|
|
endif
|
|
enddo
|
|
first=.false.
|
|
endif
|
|
|
|
if(ndir.eq.1) then
|
|
do i=0,161
|
|
itmp(j0(i))=id(i)
|
|
enddo
|
|
else
|
|
do i=0,161
|
|
itmp(i)=id(j0(i))
|
|
enddo
|
|
endif
|
|
|
|
do i=0,161
|
|
id(i)=itmp(i)
|
|
enddo
|
|
|
|
return
|
|
end subroutine inter_wspr
|