WSJT-X/flat2.f
Joe Taylor 06291ab964 First good compile with map65a running inside map65.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@334 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2007-01-11 21:25:52 +00:00

29 lines
610 B
Fortran

subroutine flat2(ss,n,nsum)
real ss(2048)
real ref(2048)
real tmp(2048)
nsmo=20
base=50*(float(nsum)**1.5)
ia=nsmo+1
ib=n-nsmo-1
do i=ia,ib
call pctile(ss(i-nsmo),tmp,2*nsmo+1,50,ref(i))
enddo
call pctile(ref(ia),tmp,ib-ia+1,68,base2)
C Don't flatten if signal is extremely low (e.g., RX is off).
if(base2.gt.0.05*base) then
do i=ia,ib
ss(i)=base*ss(i)/ref(i)
enddo
else
do i=1,n
ss(i)=0.
enddo
endif
return
end