mirror of https://github.com/saitohirga/WSJT-X.git
69 lines
1.3 KiB
Fortran
69 lines
1.3 KiB
Fortran
subroutine bzap(dat,jz,nadd,mode,fzap)
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parameter (NMAX=1024*1024)
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parameter (NMAXH=NMAX)
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real dat(jz),x(NMAX)
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real fzap(200)
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complex c(NMAX)
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equivalence (x,c)
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xn=log(float(jz))/log(2.0)
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n=xn
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if((xn-n).gt.0.) n=n+1
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nfft=2**n
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nh=nfft/nadd
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nq=nh/2
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do i=1,jz
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x(i)=dat(i)
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enddo
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if(nfft.gt.jz) call zero(x(jz+1),nfft-jz)
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call xfft(x,nfft)
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C This is a kludge:
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df=11025.0/(nadd*nfft)
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if(mode.eq.2) df=11025.0/(2*nadd*nfft)
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tol=10.
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itol=nint(2.0/df)
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do izap=1,200
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if(fzap(izap).eq.0.0) goto 10
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ia=(fzap(izap)-tol)/df
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ib=(fzap(izap)+tol)/df
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smax=0.
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do i=ia+1,ib+1
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s=real(c(i))**2 + imag(c(i))**2
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if(s.gt.smax) then
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smax=s
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ipk=i
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endif
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enddo
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fzap(izap)=df*(ipk-1)
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do i=ipk-itol,ipk+itol
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c(i)=0.
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enddo
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enddo
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10 nzaps=izap
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ia=70/df
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do i=1,ia
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c(i)=0.
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enddo
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ia=2700.0/df
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do i=ia,nq+1
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c(i)=0.
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enddo
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do i=2,nq
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c(nh+2-i)=conjg(c(i))
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enddo
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call four2a(c,nh,1,1,-1)
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fac=1.0/nfft
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do i=1,jz/nadd
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dat(i)=fac*x(i)
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enddo
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return
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end
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