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https://github.com/saitohirga/WSJT-X.git
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72 lines
1.9 KiB
Fortran
72 lines
1.9 KiB
Fortran
module sfox_mod
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parameter (NMAX=15*12000) !Samples in iwave (180,000)
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integer MM,NQ,NN,KK,ND1,ND2,ND,NFZ,NSPS,NS,NSYNC,NZ,NFFT,NFFT1
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contains
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subroutine sfox_init(mm0,nn0,kk0,itu,fspread,delay)
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character*2 itu
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integer isps(30)
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integer iloc(1)
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data isps/1000,1008,1024,1050,1080,1120,1152,1176,1200,1260, &
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1280,1296,1344,1350,1372,1400,1440,1470,1500,1512, &
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1536,1568,1600,1620,1680,1728,1920,1944,1960,2000/
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MM=mm0 !Bits per symbol
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NQ=2**MM !Q, number of MFSK tones
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NN=nn0 !Channel symbols, before puncture
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KK=kk0 !Information symbols, before puncture
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ND1=25 !Data symbols before sync
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ND2=NN-2-ND1 !Data symbols after sync
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ND=ND1+ND2 !Total data symbols
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NFZ=3 !First zero
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tsync=2.0
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jsps=nint((12.6-tsync)*12000.0/ND)
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iloc=minloc(abs(isps-jsps))
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NSPS=isps(iloc(1)) !Samples per symbol
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NS=nint(tsync*12000.0/NSPS)
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if(mod(NS,2).eq.1) NS=NS+1
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NSYNC=NS*NSPS !Samples in sync waveform
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NZ=NSPS*(ND+NS) !Samples in full Tx waveform
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NFFT=32768 !Length of FFT for sync waveform
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NFFT1=2*NSPS !Length of FFTs for symbol spectra
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fspread=0.0
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delay=0.0
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if(itu.eq.'LQ') then
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fspread=0.5
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delay=0.5
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else if(itu.eq.'LM') then
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fspread=1.5
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delay=2.0
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else if(itu.eq.'LD') then
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fspread=10.0
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delay=6.0
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else if(itu.eq.'MQ') then
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fspread=0.1
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delay=0.5
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else if(itu.eq.'MM') then
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fspread=0.5
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delay=1.0
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else if(itu.eq.'MD') then
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fspread=1.0
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delay=2.0
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else if(itu.eq.'HQ') then
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fspread=0.5
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delay=1.0
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else if(itu.eq.'HM') then
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fspread=10.0
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delay=3.0
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else if(itu.eq.'HD') then
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fspread=30.0
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delay=7.0
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endif
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return
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end subroutine sfox_init
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end module sfox_mod
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