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52 lines
1.2 KiB
Fortran
52 lines
1.2 KiB
Fortran
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subroutine setupmsk(cw,cwb)
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! Calculate the JTMS character waveforms.
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complex cw(168,0:63)
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complex cwb(168)
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integer nb(7)
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! real*8 twopi,dt,f0,f1
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character cc*64
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! 1 2 3 4 5 6
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! 0123456789012345678901234567890123456789012345678901234567890123
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data cc/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ./?- _ @'/
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nsps=24
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twopi=8.d0*atan(1.d0)
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dt=1.d0/48000.d0 !Sample interval
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f0=1000.d0
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f1=2000.d0
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dphi0=twopi*dt*f0
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dphi1=twopi*dt*f1
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do i=0,63
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k=0
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m=0
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do n=5,0,-1 !Each character gets 6+1 bits
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k=k+1
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nb(k)=iand(1,ishft(i,-n))
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m=m+nb(k)
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enddo
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k=k+1
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nb(k)=iand(m,1) !Insert parity bit
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phi=0.
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j=0
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do k=1,7 !Generate the waveform
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if(nb(k).eq.0) then
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dphi=dphi0
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else
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dphi=dphi1
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endif
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do ii=1,nsps
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j=j+1
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phi=phi+dphi
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cw(j,i)=cmplx(cos(phi),sin(phi))
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enddo
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enddo
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enddo
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cwb=cw(1:168,57)
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return
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end subroutine setupmsk
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