mirror of https://github.com/saitohirga/WSJT-X.git
29 lines
610 B
Fortran
29 lines
610 B
Fortran
subroutine flat2(ss,n,nsum)
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real ss(2048)
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real ref(2048)
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real tmp(2048)
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nsmo=20
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base=50*(float(nsum)**1.5)
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ia=nsmo+1
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ib=n-nsmo-1
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do i=ia,ib
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call pctile(ss(i-nsmo),tmp,2*nsmo+1,50,ref(i))
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enddo
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call pctile(ref(ia),tmp,ib-ia+1,68,base2)
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C Don't flatten if signal is extremely low (e.g., RX is off).
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if(base2.gt.0.05*base) then
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do i=ia,ib
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ss(i)=base*ss(i)/ref(i)
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enddo
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else
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do i=1,n
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ss(i)=0.
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enddo
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endif
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return
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end
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