84 lines
1.9 KiB
Fortran
84 lines
1.9 KiB
Fortran
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subroutine addit(itone,nfsample,nsym,nsps,ifreq,sig,dat)
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integer itone(nsym)
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real dat(60*12000)
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real*8 f,dt,twopi,phi,dphi,baud,fsample,freq,tsym,t
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tsym=nsps*1.d0/nfsample !Symbol duration
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baud=1.d0/tsym
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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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dphi=0.
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iters=1
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if(nsym.eq.79) iters=2
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do iter=1,iters
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f=ifreq
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phi=0.
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ntot=nsym*tsym/dt
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k=12000 !Start audio at t = 1.0 s
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t=0.
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if(nsym.eq.79) k=12000 + (iter-1)*12000*30 !Special case for FT8
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isym0=-1
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do i=1,ntot
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t=t+dt
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isym=nint(t/tsym) + 1
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if(isym.ne.isym0) then
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freq=f + itone(isym)*baud
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dphi=twopi*freq*dt
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isym0=isym
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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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k=k+1
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dat(k)=dat(k) + sig*sin(xphi)
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enddo
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enddo
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return
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end subroutine addit
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subroutine addcw(icw,ncw,ifreq,sig,dat)
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integer icw(ncw)
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real dat(60*12000)
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real s(60*12000)
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real x(60*12000)
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real y(60*12000)
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real*8 dt,twopi,phi,dphi,fsample,tdit,t
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wpm=25.0
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nspd=nint(1.2*12000.0/wpm)
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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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tdit=nspd*dt
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twopi=8.d0*atan(1.d0)
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dphi=twopi*ifreq*dt
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phi=0.
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k=12000 !Start audio at t = 1.0 s
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t=0.
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npts=60*12000
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x=0.
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do i=1,npts
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t=t+dt
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j=nint(t/tdit) + 1
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j=mod(j-1,ncw) + 1
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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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k=k+1
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x(k)=icw(j)
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s(k)=sin(xphi)
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if(t.ge.59.5) exit
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enddo
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nadd=0.004/dt
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call smo(x,npts,y,nadd)
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y=y/nadd
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dat=dat + sig*y*s
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return
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end subroutine addcw
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