mirror of https://github.com/saitohirga/WSJT-X.git
96 lines
2.2 KiB
Fortran
96 lines
2.2 KiB
Fortran
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!------------------------------------------------------ horizspec
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subroutine horizspec(x,brightness,contrast,a)
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real x(4096)
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integer brightness,contrast
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integer*2 a(750,300)
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real y(512),ss(128)
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complex c(0:256)
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equivalence (y,c)
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include 'gcom1.f90'
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include 'gcom2.f90'
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save
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nfft=512
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nq=nfft/4
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gain=50.0 * 3.0**(0.36+0.01*contrast)
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gamma=1.3 + 0.01*contrast
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offset=0.5*(brightness+30.0)
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! offset=0.5*(brightness+60.0)
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df=11025.0/512.0
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if(ntr.ne.ntr0) then
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if(lauto.eq.0 .or. ntr.eq.TxFirst) then
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call hscroll(a,nx)
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nx=0
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endif
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ntr0=ntr
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endif
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i0=0
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do iter=1,5
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if(nx.lt.750) nx=nx+1
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if(nx.eq.1) then
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t0curr=Tsec
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endif
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do i=1,nfft
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y(i)=1.4*x(i+i0)
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enddo
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call xfft(y,nfft)
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nq=nfft/4
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do i=1,nq
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ss(i)=real(c(i))**2 + imag(c(i))**2
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enddo
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p=0.
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do i=21,120
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p=p+ss(i)
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n=0
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! Use the gamma formula here!
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if(ss(i).gt.0.) n=gain*log10(0.05*ss(i)) + offset
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! if(ss(i).gt.0.) n=(0.2*ss(i))**gamma + offset
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n=min(252,max(0,n))
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j=121-i
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a(nx,j)=n
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enddo
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if(nx.eq.7 .or. nx.eq.378 .or. nx.eq.750) then
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! Put in yellow ticks at the standard tone frequencies for FSK441, or
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! at the sync-tone frequency for JT65, JT6M.
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do i=nx-4,nx
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if(mode.eq.'FSK441') then
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do n=2,5
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j=121-nint(n*441/df)
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a(i,j)=254
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enddo
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else if(mode(1:4).eq.'JT65') then
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j=121-nint(1270.46/df)
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a(i,j)=254
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else if(mode.eq.'JT6M') then
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j=121-nint(1076.66/df)
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a(i,j)=254
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endif
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enddo
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endif
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ng=140 - 30*log10(0.00033*p+0.001)
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ng=min(ng,150)
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if(nx.eq.1) ng0=ng
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if(abs(ng-ng0).le.1) then
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a(nx,ng)=255
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else
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ist=1
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if(ng.lt.ng0) ist=-1
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jmid=(ng+ng0)/2
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i=max(1,nx-1)
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do j=ng0+ist,ng,ist
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a(i,j)=255
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if(j.eq.jmid) i=i+1
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enddo
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ng0=ng
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endif
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i0=i0+441
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enddo
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return
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end subroutine horizspec
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