WSJT-X/map65/libm65/iqfix.f90

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