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30 lines
752 B
Fortran
30 lines
752 B
Fortran
subroutine iqfix(c,nfft,gain,phase)
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complex c(0:nfft-1)
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complex z,h,u,v
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real*8 sq1,sq2
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nh=nfft/2
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h=gain*cmplx(cos(phase),sin(phase))
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do i=1,nh-1
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u=c(i)
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v=c(nfft-i)
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x=real(u) + real(v) - (aimag(u) + aimag(v))*aimag(h) + &
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(real(u) - real(v))*real(h)
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y=aimag(u) - aimag(v) + (aimag(u) + aimag(v))*real(h) + &
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(real(u) - real(v))*aimag(h)
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c(i)=0.5*cmplx(x,y)
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z=u
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u=v
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v=z
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x=real(u) + real(v) - (aimag(u) + aimag(v))*aimag(h) + &
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(real(u) - real(v))*real(h)
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y=aimag(u) - aimag(v) + (aimag(u) + aimag(v))*real(h) + &
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(real(u) - real(v))*aimag(h)
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c(nfft-i)=0.5*cmplx(x,y)
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enddo
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return
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end subroutine iqfix
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