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31 lines
714 B
Fortran
31 lines
714 B
Fortran
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subroutine spec9f(id2,npts,nsps,s1,jz,nq)
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! Compute symbol spectra at quarter-symbol steps.
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integer*2 id2(0:npts)
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real s1(nq,jz)
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real x(960)
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complex c(0:480)
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equivalence (x,c)
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nfft=2*nsps !FFTs at twice the symbol length
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nh=nfft/2
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do j=1,jz
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ia=(j-1)*nsps/4
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ib=ia+nsps-1
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if(ib.gt.npts) exit
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x(1:nh)=id2(ia:ib)
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x(nh+1:)=0.
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call four2a(x,nfft,1,-1,0) !r2c
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k=mod(j-1,340)+1
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do i=1,NQ
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s1(i,j)=1.e-10*(real(c(i))**2 + aimag(c(i))**2)
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enddo
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enddo
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!### Reference spectrum should be applied here (or possibly earlier?) ###
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!### Normalize so that rms (or level?) is 1.0 ? ###
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return
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end subroutine spec9f
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