2015-05-29 13:19:25 -04:00
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program jt4sim
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! Generate simulated data for testing the JT4 decoder
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use wavhdr
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use packjt
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use jt4
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parameter (NMAX=60*12000)
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type(hdr) h
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integer*2 iwave(NMAX) !Generated waveform
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real*4 dat(NMAX)
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real*4 r(2)
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real*8 f0,f,dt,twopi,phi,dphi0,dphi,baud,fspread,fsample,freq,sps
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character message*22,msgsent*22,arg*8,fname*11,submode*1
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integer*4 itone(206) !Channel symbols (values 0-8)
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nargs=iargc()
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if(nargs.ne.5) then
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print*,'Usage: jt4sim "message" [A-G] fspread SNR nfiles'
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print*,'Example: jt4sim "CQ K1ABC FN42" F 200 -17 1'
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go to 999
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endif
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call getarg(1,message)
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call fmtmsg(message,iz)
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call getarg(2,arg)
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read(arg,*) submode
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mode4=ichar(submode) - ichar('A') + 1
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call getarg(3,arg)
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read(arg,*) fspread !Frequency spread (Hz)
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call getarg(4,arg)
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read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
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call getarg(5,arg)
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read(arg,*) nfiles !Number of files
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rmsdb=25.
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rms=10.0**(0.05*rmsdb)
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fsample=12000.d0 !Sample rate (Hz)
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dt=1.d0/fsample !Sample interval (s)
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twopi=8.d0*atan(1.d0)
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npts=60*12000
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sps=12000.d0/4.375d0 !2742.857...
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f0=1000.d0 !Frequency of lowest tone (Hz)
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2015-11-17 20:28:12 -05:00
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freq=f0 !Silence compiler warning
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dphi=0.0 !Silence compiler warning
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2015-05-29 13:19:25 -04:00
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h=default_header(12000,npts)
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if(message(1:3).eq.'sin') read(message(4:),*) sinfreq
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write(*,1000)
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1000 format('File S/N Message'/ &
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'--------------------------------')
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call gen4(message,0,msgsent,itone,itype) !Encode message into tone #s
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! write(*,1030) itone
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!1030 format(/'Channel symbols'/(30i2))
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do ifile=1,nfiles !Loop over all files
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nmin=(ifile-1)*2
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ihr=nmin/60
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imin=mod(nmin,60)
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write(fname,1002) ihr,imin !Create output filename
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1002 format('000000_',2i2.2)
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open(10,file=fname//'.wav',access='stream',status='unknown')
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if(snrdb.lt.90) then
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do i=1,npts
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dat(i)=gran()
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enddo
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else
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dat(1:npts)=0.
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endif
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snrdbx=snrdb
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sig=10.0**(0.05*snrdbx)
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if(snrdb.gt.90.0) sig=1.0
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write(*,1020) ifile,snrdbx,msgsent
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1020 format(i3,f7.1,2x,a22)
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phi=0.
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baud=12000.d0/sps
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isym0=0
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k0=12000
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do k=k0+1,npts
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isym=1.d0 + (k-k0)/sps
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if(isym.gt.206) exit
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if(isym.ne.isym0) then
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freq=f0 + itone(isym)*baud*nch(mode4)
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if(message(1:3).eq.'sin') freq=sinfreq
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dphi0=twopi*freq*dt
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dphi=dphi0
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isym0=isym
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endif
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if(fspread.gt.0.d0 .and. mod(k,120).eq.0) then
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call random_number(r)
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f=freq + 0.5*fspread*(r(1)+r(2)-1.0)
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dphi=twopi*f*dt
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endif
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phi=phi + dphi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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dat(k)=dat(k) + sig*sin(xphi)
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enddo
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fac=32767.0
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if(snrdb.ge.90.0) iwave(1:npts)=nint(fac*dat(1:npts))
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if(snrdb.lt.90.0) iwave(1:npts)=nint(rms*dat(1:npts))
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write(10) h,iwave(1:npts)
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close(10)
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enddo
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999 end program jt4sim
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