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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8234 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
56 lines
1.1 KiB
Fortran
56 lines
1.1 KiB
Fortran
subroutine compress(c)
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parameter (NMAX=15*12000) !Samples in iwave (180,000)
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complex c(0:NMAX-1)
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real xr(0:NMAX-1),xi(0:NMAX-1)
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xr=real(c)
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call wavestats(xr,NMAX,rms,pk,pwr_pk,pwr_ave)
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xr=xr/rms
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xi=aimag(c)/rms
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do i=0,NMAX-1
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c(i)=rms*cmplx(h1(xr(i)),h1(xi(i)))
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enddo
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! par=pwr_pk/pwr_ave
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! write(*,1010) 5,rms,pk,pwr_pk,pwr_ave,par
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!1010 format(i3,2f10.3,3f10.2)
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! call wavestats(xi,NMAX,rms,pk,pwr_pk,pwr_ave)
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! par=pwr_pk/pwr_ave
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! write(*,1010) 5,rms,pk,pwr_pk,pwr_ave,par
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return
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end subroutine compress
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real function h1(x)
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! sigma=1.0/sqrt(2.0)
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sigma=1.0
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xlim=sigma/sqrt(6.0)
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ax=abs(x)
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sgnx=1.0
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if(x.lt.0) sgnx=-1.0
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if(ax.le.xlim) then
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h1=x
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else
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z=exp(1.0/6.0 - (ax/sigma)**2)
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h1=sgnx*sqrt(6.0)*sigma*(2.0/3.0 - 0.5*z)
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endif
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return
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end function h1
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subroutine wavestats(x,kz,rms,pk,pwr_pk,pwr_ave)
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real x(kz)
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sumsq=dot_product(x,x)
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rms=sqrt(sumsq/kz)
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pk=max(maxval(x),-minval(x))
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pwr_pk=pk*pk
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pwr_ave=sumsq/kz
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return
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end subroutine wavestats
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