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100 lines
2.7 KiB
Fortran
100 lines
2.7 KiB
Fortran
subroutine cgen65(message,mode65,samfac,nsendingsh,msgsent,cwave,nwave)
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! Encodes a JT65 message into a wavefile.
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! Executes in 17 ms on opti-745.
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use packjt
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parameter (NMAX=60*96000) !Max length of wave file
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character*22 message !Message to be generated
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character*22 msgsent !Message as it will be received
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character*3 cok !' ' or 'OOO'
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real*8 t,dt,phi,f,f0,dfgen,dphi,twopi,samfac,tsymbol
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complex cwave(NMAX) !Generated complex wave file
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integer dgen(12)
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integer sent(63)
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logical first
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integer nprc(126)
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real pr(126)
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data nprc/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
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0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
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0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
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0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
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1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
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0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
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1,1,1,1,1,1/
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data twopi/6.283185307179586476d0/,first/.true./
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save
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if(first) then
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do i=1,126
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pr(i)=2*nprc(i)-1
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enddo
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first=.false.
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endif
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call chkmsg(message,cok,nspecial,flip) !See if it's a shorthand
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if(nspecial.eq.0) then
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call packmsg(message,dgen,itype) !Pack message into 72 bits
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nsendingsh=0
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if(iand(dgen(10),8).ne.0) nsendingsh=-1 !Plain text flag
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call rs_encode(dgen,sent)
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call interleave63(sent,1) !Apply interleaving
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call graycode(sent,63,1) !Apply Gray code
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nsym=126 !Symbols per transmission
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tsymbol=4096.d0/11025.d0 !Time per symbol
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else
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nsendingsh=1 !Flag for shorthand message
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nsym=32
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tsymbol=16384.d0/11025.d0
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endif
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! Set up necessary constants
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dt=1.d0/(samfac*96000.d0)
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f0=118*11025.d0/1024
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dfgen=mode65*11025.d0/4096.d0
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t=0.d0
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phi=0.d0
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k=0
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j0=0
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ndata=nsym*96000.d0*samfac*tsymbol
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do i=1,ndata
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t=t+dt
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j=int(t/tsymbol) + 1 !Symbol number, 1-126
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if(j.ne.j0) then
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f=f0
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if(nspecial.ne.0 .and. mod(j,2).eq.0) f=f0+10*nspecial*dfgen
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if(nspecial.eq.0 .and. flip*pr(j).lt.0.0) then
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k=k+1
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f=f0+(sent(k)+2)*dfgen
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endif
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dphi=twopi*dt*f
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j0=j
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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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cwave(i)=cmplx(cos(xphi),-sin(xphi))
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enddo
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cwave(ndata+1:)=0
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nwave=ndata + 48000
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call unpackmsg(dgen,msgsent)
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if(flip.lt.0.0) then
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do i=22,1,-1
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if(msgsent(i:i).ne.' ') goto 10
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enddo
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10 msgsent=msgsent(1:i)//' OOO'
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endif
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if(nsendingsh.eq.1) then
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if(nspecial.eq.2) msgsent='RO'
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if(nspecial.eq.3) msgsent='RRR'
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if(nspecial.eq.4) msgsent='73'
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endif
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return
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end subroutine cgen65
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