mirror of https://github.com/saitohirga/WSJT-X.git
79 lines
1.6 KiB
Fortran
79 lines
1.6 KiB
Fortran
subroutine mskdt(d,npts,ty,yellow,nyel)
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parameter (NFFT=1024,NH=NFFT/2)
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real d(npts)
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real x(0:NFFT-1)
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real green(703)
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real yellow(703) !703 = 30*12000/512
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real ty(703)
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real y2(175)
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real ty2(175)
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integer indx(703)
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logical ok
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complex c(0:NH)
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equivalence (x,c)
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df=12000.0/NFFT
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i1=nint(300.0/df)
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i2=nint(800.0/df)
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i3=nint(2200.0/df)
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i4=nint(2700.0/df)
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nblks=npts/NH - 1
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do j=1,nblks
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ib=(j+1)*NH
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ia=ib-NFFT+1
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x=d(ia:ib)
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call four2a(x,NFFT,1,-1,0) !r2c FFT
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sqlow=0.
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do i=i1,i2
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sqlow=sqlow + real(c(i))**2 + aimag(c(i))**2
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enddo
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sqmid=0.
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do i=i2,i3
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sqmid=sqmid + real(c(i))**2 + aimag(c(i))**2
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enddo
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sqhigh=0.
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do i=i3,i4
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sqhigh=sqhigh + real(c(i))**2 + aimag(c(i))**2
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enddo
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green(j)=db(sqlow+sqmid+sqhigh)
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yellow(j)=db(sqmid/(sqlow+sqhigh))
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ty(j)=j*512.0/12000.0
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enddo
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npct=20
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call pctile(green,nblks,npct,base)
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green(1:nblks)=green(1:nblks) - base - 0.3
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call pctile(yellow,nblks,npct,base)
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yellow(1:nblks)=yellow(1:nblks) - base - 0.6
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call indexx(yellow,nblks,indx)
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do j=1,nblks/4
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k=indx(nblks+1-j)
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ty(j)=ty(k)
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yellow(j)=yellow(k)
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if(yellow(j).lt.1.5) exit
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enddo
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nyel=j-1
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k=1
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y2(1)=yellow(1)
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ty2(1)=ty(1)
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do j=2,nyel
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ok=.true.
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do i=1,j-1
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if(abs(ty(i)-ty(j)).lt.0.117) ok=.false.
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enddo
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if(ok) then
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k=k+1
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y2(k)=yellow(j)
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ty2(k)=ty(j)
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endif
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enddo
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nyel=k
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yellow(1:nyel)=y2(1:nyel)
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ty(1:nyel)=ty2(1:nyel)
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return
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end subroutine mskdt
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