2016-12-15 18:42:33 +00:00
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subroutine ana64(dd,npts,c0)
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use timer_module, only: timer
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2020-10-22 15:56:20 -04:00
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real dd(npts) !Raw data at 12000 Hz
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complex c0(0:npts-1) !Complex data at 6000 Hz
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2016-12-15 18:42:33 +00:00
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save
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2020-10-22 15:56:20 -04:00
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nfft1=npts
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2016-12-15 18:42:33 +00:00
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nfft2=nfft1/2
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df1=12000.0/nfft1
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fac=2.0/nfft1
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c0(0:npts-1)=fac*dd(1:npts)
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call four2a(c0,nfft1,1,-1,1) !Forward c2c FFT
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2020-10-22 15:56:20 -04:00
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c0(nfft2/2+1:nfft2-1)=0.
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2016-12-15 18:42:33 +00:00
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c0(0)=0.5*c0(0)
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call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig
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return
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end subroutine ana64
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