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https://github.com/saitohirga/WSJT-X.git
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87 lines
2.3 KiB
Fortran
87 lines
2.3 KiB
Fortran
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subroutine gen24(message,mode4,samfac,ntxdf,iwave,nwave,sendingsh,msgsent,nmsg)
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! Encode a JT4 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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real*8 t,dt,phi,f,f0,dfgen,dphi,pi,twopi,samfac,tsymbol
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integer*2 iwave(NMAX) !Generated wave file
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integer sendingsh
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integer dgen(13)
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integer*1 data0(13),symbol(216)
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logical first
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include 'prcom2.f'
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data first/.true./
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save
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nsym=207 !Symbols per transmission
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if(first) then
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do i=1,nsym
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pr2(i)=2*npr2(i)-1
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enddo
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pi=4.d0*atan(1.d0)
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twopi=2.d0*pi
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first=.false.
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endif
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call chkmsg(message,cok,nspecial,flip)
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call packmsg(message,dgen) !Pack 72-bit message into 12 six-bit symbols
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call entail(dgen,data0)
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call unpackmsg(dgen,msgsent)
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nbytes=(72+31+7)/8
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call encode(data0,nbytes,symbol(2)) !Convolutional encoding
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symbol(1)=0 !Reference phase
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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 interleave24(symbol(2),1) !Apply JT4 interleaving
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! Set up necessary constants
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tsymbol=2520.d0/11025.d0
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dt=1.d0/(samfac*11025.d0)
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f0=118*11025.d0/1024 + ntxdf
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dfgen=11025.d0/2520 !4.375 Hz
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t=0.d0
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phi=0.d0
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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, 1-207
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if(j.ne.j0) then
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f=f0 + (npr2(j)+2*symbol(j)-1.5) * dfgen * mode4
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if(flip.lt.0.0) f=f0+((1-npr2(j))+2*symbol(j)-1.5)*dfgen*mode4
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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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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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do i=22,1,-1
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if(msgsent(i:i).ne.' ') goto 20
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enddo
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20 nmsg=i
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! write(*,3002) (symbol(i),i=1,207)
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! 3002 format(70i1)
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return
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end subroutine gen24
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