WSJT-X/lib/ps4.f90

subroutine ps4(dat,nfft,s)

  parameter (NMAX=2520+2)
  parameter (NHMAX=NMAX/2-1)
  real dat(nfft)
  real dat2(NMAX)
  real s(NHMAX)
  complex c(0:NMAX)
  equivalence(dat2,c)

  nh=nfft/2
  do i=1,nh
     dat2(i)=dat(i)/128.0       !### Why 128 ??
  enddo
  do i=nh+1,nfft
     dat2(i)=0.
  enddo

  call four2a(c,nfft,1,-1,0)

  fac=1.0/nfft
  do i=1,nh
     s(i)=fac*(real(c(i))**2 + aimag(c(i))**2)
  enddo

  return
end subroutine ps4
Reintegrate Joe's experimental VHF & up features 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 2015-04-22 17:48:03 +00:00			`subroutine ps4(dat,nfft,s)`

			`parameter (NMAX=2520+2)`
			`parameter (NHMAX=NMAX/2-1)`
			`real dat(nfft)`
			`real dat2(NMAX)`
			`real s(NHMAX)`
			`complex c(0:NMAX)`
			`equivalence(dat2,c)`

			`nh=nfft/2`
			`do i=1,nh`
			`dat2(i)=dat(i)/128.0 !### Why 128 ??`
			`enddo`
			`do i=nh+1,nfft`
			`dat2(i)=0.`
			`enddo`

			`call four2a(c,nfft,1,-1,0)`

			`fac=1.0/nfft`
			`do i=1,nh`
			`s(i)=fac(real(c(i))2 + aimag(c(i))*2)`
			`enddo`

			`return`
			`end subroutine ps4`