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https://github.com/saitohirga/WSJT-X.git
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7e549b5d55
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8271 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
113 lines
2.4 KiB
Fortran
113 lines
2.4 KiB
Fortran
subroutine foxgen()
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parameter (NN=79,KK=87,NSPS=4*1920)
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parameter (NWAVE=NN*NSPS,NFFT=614400,NH=NFFT/2)
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character*32 cmsg
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character*22 msg,msgsent
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logical bcontest
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integer itone(NN)
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integer*1 msgbits(KK)
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integer*8 count0,count1,clkfreq
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real x(NFFT),y(NFFT)
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real*8 dt,twopi,f0,fstep,dfreq,phi,dphi
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complex cx(0:NH),cy(0:NH)
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common/foxcom/wave(NWAVE),nslots,cmsg(5)
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equivalence (x,cx),(y,cy)
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call system_clock(count0,clkfreq)
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bcontest=.false.
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i3bit=0
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fstep=60.d0
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dfreq=6.25d0
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dt=1.d0/48000.d0
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twopi=8.d0*atan(1.d0)
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wave=0.
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do n=1,nslots
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i3bit=0
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print*,n,i3bit,cmsg(n)
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msg=cmsg(n)(1:22)
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call genft8(msg," ",bcontest,i3bit,msgsent,msgbits,itone)
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f0=1500.d0 + fstep*(n-1)
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phi=0.d0
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k=0
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do j=1,NN
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f=f0 + dfreq*itone(j)
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dphi=twopi*f*dt
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do ii=1,NSPS
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k=k+1
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phi=phi+dphi
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xphi=phi
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wave(k)=wave(k)+sin(xphi)
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enddo
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enddo
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call system_clock(count1,clkfreq)
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enddo
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sqx=0.
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do i=1,NWAVE
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sqx=sqx + wave(i)*wave(i)
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enddo
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sigmax=sqrt(sqx/NWAVE)
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wave=wave/sigmax !Force rms=1.0
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do i=1,NWAVE
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wave(i)=h1(wave(i)) !Compress the waveform
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enddo
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fac=1.0/maxval(abs(wave)) !Set maxval = 1.0
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wave=fac*wave
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if(NWAVE.ne.-99) go to 100 !### Omit filtering, for now ###
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x(1:k)=wave
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x(k+1:)=0.
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call four2a(x,nfft,1,-1,0)
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nadd=64
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k=0
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df=48000.0/NFFT
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rewind(29)
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do i=1,NH/nadd - 1
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sx=0.
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! sy=0.
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do j=1,nadd
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k=k+1
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sx=sx + real(cx(k))**2 + aimag(cx(k))**2
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! sy=sy + real(cy(k))**2 + aimag(cy(k))**2
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enddo
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freq=df*(k-nadd/2+0.5)
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write(29,1022) freq,sx,sy,db(sx)-90.0,db(sy)-90.0
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1022 format(f10.3,2e12.3,2f10.3)
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if(freq.gt.3000.0) exit
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enddo
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flush(29)
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100 call system_clock(count1,clkfreq)
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! time=float(count1-count0)/float(clkfreq) !Cumulative execution time
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! write(*,3010) time
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!3010 format('Time:',f10.6)
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return
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end subroutine foxgen
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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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