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