mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-08-03 13:22:28 -04:00
a51c5c4251
As at ^/branches/wsjtx_exp@5271 git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5272 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
30 lines
608 B
Fortran
30 lines
608 B
Fortran
subroutine lpf1(dd,jz,dat,jz2)
|
|
|
|
parameter (NFFT1=64*11025,NFFT2=32*11025)
|
|
real dd(jz)
|
|
real dat(jz)
|
|
real x(NFFT1)
|
|
complex cx(0:NFFT1/2)
|
|
equivalence (x,cx)
|
|
save x,cx
|
|
|
|
fac=1.0/float(NFFT1)
|
|
x(1:jz)=fac*dd(1:jz)
|
|
x(jz+1:NFFT1)=0.0
|
|
call four2a(x,NFFT1,1,-1,0) !Forwarxd FFT, r2c
|
|
cx(NFFT2/2:)=0.0
|
|
|
|
! df=11025.0/NFFT1
|
|
! do i=1,NFFT1/2
|
|
! sx=real(cx(i))**2 + aimag(cx(i))**2
|
|
! write(50,3000) i*df,sx
|
|
!3000 format(f15.6,e12.3)
|
|
! enddo
|
|
|
|
call four2a(cx,NFFT2,1,1,-1) !Inverse FFT, c2r
|
|
jz2=jz/2
|
|
dat(1:jz2)=x(1:jz2)
|
|
|
|
return
|
|
end subroutine lpf1
|