mirror of https://github.com/saitohirga/WSJT-X.git
51 lines
1.3 KiB
Fortran
51 lines
1.3 KiB
Fortran
subroutine spec_qra65(c0,nsps,s3,LL,NN)
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! Compute synchronized symbol spectra.
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complex c0(0:85*nsps-1) !Synchronized complex data at 6000 S/s
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complex, allocatable :: cs(:) !Complex symbol spectrum
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real s3(LL,NN) !Synchronized symbol spectra
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real xbase0(LL),xbase(LL) !Work arrays
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integer isync(22) !Indices of sync symbols
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data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
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allocate(cs(0:nsps-1))
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fac=1.0/nsps
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j=0
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n=1
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do k=1,84
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if(k.eq.isync(n)) then
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n=n+1
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cycle
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endif
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j=j+1
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ja=(k-1)*nsps
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jb=ja+nsps-1
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cs=fac*c0(ja:jb)
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call four2a(cs,nsps,1,-1,1) !c2c FFT to frequency
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do ii=1,LL
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i=ii-65
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if(i.lt.0) i=i+nsps
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s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
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enddo
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enddo
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df=6000.0/nsps
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do i=1,LL
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call pctile(s3(i,1:NN),NN,45,xbase0(i)) !Get baseline for passband shape
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enddo
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nh=9
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xbase(1:nh-1)=sum(xbase0(1:nh-1))/(nh-1.0)
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xbase(LL-nh+1:LL)=sum(xbase0(LL-nh+1:LL))/(nh-1.0)
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do i=nh,LL-nh
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xbase(i)=sum(xbase0(i-nh+1:i+nh))/(2*nh+1) !Smoothed passband shape
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enddo
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do i=1,LL
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s3(i,1:NN)=s3(i,1:NN)/(xbase(i)+0.001) !Apply frequency equalization
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enddo
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return
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end subroutine spec_qra65
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