WSJT-X/lib/ana64.f90

21 lines
555 B
Fortran
Raw Normal View History

subroutine ana64(iwave,npts,c0)
use timer_module, only: timer
integer*2 iwave(npts) !Raw data at 12000 Hz
complex c0(0:npts-1) !Complex data at 6000 Hz
save
nfft1=npts
nfft2=nfft1/2
df1=12000.0/nfft1
fac=2.0/(32767.0*nfft1)
c0(0:npts-1)=fac*iwave(1:npts)
call four2a(c0,nfft1,1,-1,1) !Forward c2c FFT
c0(nfft2/2+1:nfft2-1)=0.
c0(0)=0.5*c0(0)
call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig
return
end subroutine ana64