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25 lines
425 B
Fortran
25 lines
425 B
Fortran
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subroutine tweak1(ca,jz,f0,cb)
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! Shift frequency of analytic signal ca, with output to cb
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complex ca(jz),cb(jz)
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real*8 twopi
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complex*16 w,wstep
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data twopi/0.d0/
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save twopi
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if(twopi.eq.0.d0) twopi=8.d0*atan(1.d0)
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w=1.d0
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dphi=twopi*f0/11025.d0
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wstep=cmplx(cos(dphi),sin(dphi))
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x0=0.5*(jz+1)
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s=2.0/jz
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do i=1,jz
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x=s*(i-x0)
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w=w*wstep
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cb(i)=w*ca(i)
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enddo
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return
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end subroutine tweak1
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