mirror of https://github.com/saitohirga/WSJT-X.git
104 lines
3.1 KiB
Fortran
104 lines
3.1 KiB
Fortran
program ft4sim_mult
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! Generate simulated signals for experimental "FT4" mode
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use wavhdr
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use packjt77
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include 'ft4_params.f90' !FT4 protocol constants
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parameter (NWAVE=NN*NSPS)
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parameter (NZZ=72576) !Length of .wav file (21*3456)
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type(hdr) h !Header for .wav file
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character arg*12,fname*17,cjunk*4
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character msg37*37,msgsent37*37,c77*77
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complex cwave0((NN+2)*NSPS)
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real wave0((NN+2)*NSPS)
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real wave(NZZ)
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real tmp(NZZ)
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integer itone(NN)
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integer*1 msgbits(77)
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integer*2 iwave(NZZ) !Generated full-length waveform
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.2) then
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print*,'Usage: ft4sim_mult nsigs nfiles'
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print*,'Example: ft4sim_mult 20 8 '
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go to 999
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endif
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call getarg(1,arg)
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read(arg,*) nsigs !Number of signals
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call getarg(2,arg)
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read(arg,*) nfiles !Number of files
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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hmod=1.0 !Modulation index (0.5 is MSK, 1.0 is FSK)
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tt=NSPS*dt !Duration of unsmoothed symbols (s)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ*dt !Transmission length (s) without ramp up/down
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bandwidth_ratio=2500.0/(fs/2.0)
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txt=NN*NSPS/12000.0
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open(10,file='messages.txt',status='old',err=998)
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do ifile=1,nfiles
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1 read(10,1001,end=999) cjunk,n
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1001 format(a4,i2)
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if(cjunk.ne.'File' .or. n.ne.ifile) go to 1
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wave=0.
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write(fname,1002) ifile
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1002 format('000000_',i6.6,'.wav')
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do isig=1,nsigs
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read(10,1003,end=100) cjunk,isnr,xdt0,ifreq,msg37
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1003 format(a4,30x,i3,f5.1,i5,1x,a37)
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if(cjunk.eq.'File') go to 100
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if(isnr.lt.-17) isnr=-17
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f0=ifreq*960.0/576.0
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call random_number(r)
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xdt=r-0.5
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! Source-encode, then get itone()
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i3=-1
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n3=-1
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call pack77(msg37,i3,n3,c77)
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call genft4(msg37,0,msgsent37,msgbits,itone)
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nwave0=(NN+2)*NSPS
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icmplx=0
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call gen_ft4wave(itone,NN,NSPS,12000.0,f0,cwave0,wave0,icmplx,nwave0)
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k0=nint((xdt+0.5)/dt)
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if(k0.lt.1) k0=1
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tmp(:k0-1)=0.0
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tmp(k0:k0+nwave0-1)=wave0
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tmp(k0+nwave0:)=0.0
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! Insert this signal into wave() array
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sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*isnr)
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wave=wave + sig*tmp
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write(*,1100) fname(1:13),isig,isnr,xdt,nint(f0),msg37
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1100 format(a13,i4,i5,f5.1,i6,2x,a37)
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enddo ! isig
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100 backspace 10
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do i=1,NZZ !Add gaussian noise at specified SNR
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xnoise=gran()
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wave(i)=wave(i) + xnoise
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enddo
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gain=30.0
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wave=gain*wave
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if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
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iwave=nint(wave)
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h=default_header(12000,NZZ)
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open(12,file=fname,status='unknown',access='stream')
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write(12) h,iwave !Save to *.wav file
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close(12)
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print*,' '
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enddo ! ifile
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go to 999
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998 print*,'Cannot open file "messages.txt"'
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999 end program ft4sim_mult
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