WSJT-X/lib/softsym.f90

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subroutine softsym(c0,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt,freq,drift, &
schk,i1SoftSymbols)
! Compute the soft symbols
complex c0(0:npts8-1)
complex c2(0:4096-1)
complex c3(0:4096-1)
complex c5(0:4096-1)
real a(3)
integer*1 i1SoftSymbolsScrambled(207)
integer*1 i1SoftSymbols(207)
include 'jt9sync.f90'
nspsd=16
ndown=nsps8/nspsd
! Mix, low-pass filter, and downsample to 16 samples per symbol
call downsam9(c0,npts8,nsps8,newdat,nspsd,fpk,c2,nz2)
call peakdt9(c2,nz2,nsps8,nspsd,c3,nz3,xdt) !Find DT
fsample=1500.0/ndown
a=0.
call afc9(c3,nz3,fsample,a,syncpk) !Find deltaF, fDot, fDDot
freq=fpk - a(1)
drift=-2.0*a(2)
call twkfreq(c3,c5,nz3,fsample,a) !Correct for deltaF, fDot, fDDot
! Compute soft symbols (in scrambled order)
call symspec2(c5,nz3,nsps8,nspsd,fsample,freq,drift,snrdb,schk, &
i1SoftSymbolsScrambled)
! Remove interleaving
call interleave9(i1SoftSymbolsScrambled,-1,i1SoftSymbols)
return
end subroutine softsym