mirror of https://github.com/saitohirga/WSJT-X.git
54 lines
1.4 KiB
Fortran
54 lines
1.4 KiB
Fortran
subroutine spec64(c0,npts,nsps,mode_q65,jpk,s3,LL,NN)
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parameter (MAXFFT=20736)
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complex c0(0:npts-1) !Complex spectrum of dd()
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complex cs(0:MAXFFT-1) !Complex symbol spectrum
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real s3(LL,NN) !Synchronized symbol spectra
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real xbase0(LL),xbase(LL)
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! integer ipk1(1)
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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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nfft=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 + jpk
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jb=ja+nsps-1
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if(ja.lt.0) ja=0
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if(jb.gt.npts-1) jb=npts-1
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nz=jb-ja
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cs(0:nz)=c0(ja:jb)
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if(nz.lt.nfft-1) cs(nz+1:)=0.
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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+mode_q65 !mode_q65 = 1 2 4 8 16 for Q65 A B C D E
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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/nfft
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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=25
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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 spec64
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