mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-19 10:32:02 -05:00
26 lines
504 B
Fortran
26 lines
504 B
Fortran
|
subroutine analytic(d,npts,nfft,s,c)
|
||
|
|
|
||
|
|
! Convert real data to analytic signal
|
||
|
|
|
||
|
|
parameter (NMAX=512*1024)
|
||
|
|
real d(npts)
|
||
|
|
real s(NMAX)
|
||
|
|
complex c(NMAX)
|
||
|
|
|
||
|
|
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
|