WSJT-X/lib/spec64.f90

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subroutine spec64(c0,nsps,mode,mode64,jpk,s3,LL,NN)
parameter (MAXFFT=20736)
!### Fix this:
complex c0(0:1800000-1) !Complex spectrum of dd()
complex cs(0:MAXFFT-1) !Complex symbol spectrum
real s3(LL,NN) !Synchronized symbol spectra
real xbase0(LL),xbase(LL)
! integer ipk1(1)
integer isync(22) !Indices of sync symbols
data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
nfft=nsps
fac=1.0/nfft
if(mode.eq.64) then
do j=1,NN
jj=j+7 !Skip first Costas array
if(j.ge.33) jj=j+14 !Skip middle Costas array
ja=jpk + (jj-1)*nfft
jb=ja+nfft-1
cs(0:nfft-1)=fac*c0(ja:jb)
call four2a(cs,nfft,1,-1,1)
do ii=1,LL
i=ii-65
if(i.lt.0) i=i+nfft
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
enddo
enddo
else
j=0
n=1
do k=1,84
if(k.eq.isync(n)) then
n=n+1
cycle
endif
j=j+1
ja=(k-1)*nsps + jpk
jb=ja+nsps-1
cs(0:nfft-1)=fac*c0(ja:jb)
call four2a(cs,nsps,1,-1,1) !c2c FFT to frequency
do ii=1,LL
i=ii-65+mode64 !mode64 = 1 2 4 8 16 for Q65 A B C D E
if(i.lt.0) i=i+nsps
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
enddo
enddo
endif
df=6000.0/nfft
do i=1,LL
call pctile(s3(i,1:NN),NN,45,xbase0(i)) !Get baseline for passband shape
enddo
nh=25
xbase(1:nh-1)=sum(xbase0(1:nh-1))/(nh-1.0)
xbase(LL-nh+1:LL)=sum(xbase0(LL-nh+1:LL))/(nh-1.0)
do i=nh,LL-nh
xbase(i)=sum(xbase0(i-nh+1:i+nh))/(2*nh+1) !Smoothed passband shape
enddo
do i=1,LL
s3(i,1:NN)=s3(i,1:NN)/(xbase(i)+0.001) !Apply frequency equalization
enddo
! print*,'a',LL,NN,jpk,mode,mode64
! df=6000.0/nfft
! do i=1,LL
! write(71,3071) i,i-65,i*df,(s3(i,j),j=1,4)
!3071 format(2i8,f10.3,4e12.3)
! enddo
! do j=1,NN
! ipk1=maxloc(s3(1:LL,j))
! m=ipk1(1)-65
! write(72,3072) j,m,m/2,m/4,m/8,m/16,m/32,m/64
!3072 format(8i7)
! enddo
return
end subroutine spec64