mirror of https://github.com/saitohirga/WSJT-X.git
84 lines
2.4 KiB
Fortran
84 lines
2.4 KiB
Fortran
subroutine gen65(message,mode65,samfac,iwave,nwave,sendingsh,
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+ msgsent)
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C Encodes a JT65 message into a wavefile.
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parameter (NMAX=60*11025) !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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character*6 c1,c2
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real*8 t,dt,phi,f,f0,dfgen,dphi,twopi,samfac,tsymbol
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integer*2 iwave(NMAX) !Generated wave file
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integer dgen(12)
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integer sent(63)
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integer sendingsh
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common/c1c2/c1,c2
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include 'prcom.h'
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data twopi/6.283185307d0/
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save
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if(abs(pr(1)).ne.1.0) call setup65
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call chkmsg(message,cok,nspecial,flip)
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if(nspecial.eq.0) then
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call packmsg(message,dgen) !Pack message into 72 bits
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sendingsh=0
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if(iand(dgen(10),8).ne.0) sendingsh=-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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tsymbol=4096.d0/11025.d0
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nsym=126 !Symbols per transmission
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else
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tsymbol=16384.d0/11025.d0
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nsym=32
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sendingsh=1 !Flag for shorthand message
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endif
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C Set up necessary constants
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dt=1.0/(samfac*11025.0)
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f0=118*11025.d0/1024
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dfgen=mode65*11025.0/4096.0
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xn=0.
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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*11025.d0*samfac*tsymbol)/2
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ndata=2*ndata
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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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iwave(i)=32767.0*sin(phi)
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enddo
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do j=1,5512 !Put another 0.5 sec of silence at end
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i=i+1
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iwave(i)=0
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enddo
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nwave=i
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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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return
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end
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