WSJT-X/libm65/analytic.f90

25 lines
475 B
Fortran
Raw Normal View History

subroutine analytic(d,npts,nfft,s,c)
! Convert real data to analytic signal
real d(npts)
real s(npts)
complex c(npts)
nh=nfft/2
fac=2.0/nfft
c(1:npts)=fac*d(1:npts)
c(npts+1:nfft)=0.
call four2a(c,nfft,1,-1,1) !Forward c2c FFT
do i=1,nh
s(i)=real(c(i))**2 + aimag(c(i))**2
enddo
c(1)=0.5*c(1)
c(nh+2:nfft)=0.
call four2a(c,nfft,1,1,1) !Inverse c2c FFT
return
end subroutine analytic