WSJT-X/spec.f90

101 lines
2.3 KiB
Fortran
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subroutine spec(brightness,contrast,ngain,nspeed,a,a2)
parameter (NX=750,NY=130,NTOT=NX*NY)
! Input:
integer brightness,contrast !Display parameters
integer ngain !Digital gain for input audio
integer nspeed !Scrolling speed index
! Output:
integer*2 a(NTOT) !Pixel values for NX x NY array
integer*2 a2(NTOT) !Pixel values for NX x NY array
logical first
integer nstep(5)
integer b0,c0
! Could save memory by doing the averaging-by-7 (or 10?) of ss5 in symspec.
include 'spcom.f90'
real s(NFFT,NY)
include 'gcom1.f90'
include 'gcom2.f90'
include 'gcom3.f90'
include 'gcom4.f90'
data first/.true./
data nstep/28,20,14,10,7/ !Integration limits
save
if(first) then
df=96000.0/nfft
call zero(a,NX*NY/2)
call zero(a2,NX*NY/2)
first=.false.
endif
nadd=nstep(nspeed)
nlines=322/nadd
call zero(s,NFFT*NY)
k=0
do j=1,nlines
do n=1,nadd
k=k+1
do i=1,NFFT
s(i,j)=s(i,j) + ss5(k,i)
enddo
enddo
enddo
newpts=NX*nlines
do i=newpts+1,NX*NY
a(i)=a(i-newpts)
a2(i)=a2(i-newpts)
enddo
gain=40*sqrt(nstep(nspeed)/5.0) * 5.0**(0.01*contrast)
gamma=1.3 + 0.01*contrast
offset=(brightness+64.0)/2
fac=20.0/nadd
foffset=0.001*(1270+nfcal)
nbpp=(nfb-nfa)*NFFT/(96.0*NX) !Bins per pixel in wideband (upper) waterfall
fselect=mousefqso + foffset
imid=nint(1000.0*(fselect-125.0+48.0)/df)
fmid=0.5*(nfa+nfb) + foffset
imid0=nint(1000.0*(fmid-125.0+48.0)/df) - nbpp/2 !Last term is empirical
i0=imid-375
ii0=imid0-375*nbpp
if(nfullspec.eq.1) then
nbpp=NFFT/NX
ii0=0
endif
k=0
do j=nlines,1,-1 !Reverse order so last will be on top
do i=1,NX
k=k+1
n=0
x=0.
iia=(i-1)*nbpp + ii0 + 1
iib=i*nbpp + ii0
do ii=iia,iib
x=max(x,s(ii,j))
enddo
x=fac*x
if(x.gt.0.0) n=(2.0*x)**gamma + offset
n=min(252,max(0,n))
a(k)=n
! Now do the lower (zoomed) waterfall with one FFT bin per pixel.
n=0
x=fac*s(i0+i-1,j)
if(x.gt.0.0) n=(3.0*x)**gamma + offset
n=min(252,max(0,n))
a2(k)=n
enddo
enddo
return
end subroutine spec