mirror of https://github.com/saitohirga/WSJT-X.git
50 lines
1.6 KiB
Fortran
50 lines
1.6 KiB
Fortran
subroutine gen6m(msg,samfac,iwave,nwave)
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C Encodes a message into a wavefile for transmitting JT6M signals.
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parameter (NMAX=21504) !NMAX=28*512*3/2: number of waveform samples
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character*28 msg !Message to be generated
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real*8 samfac
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real*4 x(NMAX) !Data for wavefile
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integer*2 iwave(NMAX) !Generated wave file
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integer*4 imsg(28)
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do i=27,1,-1 !Get message length
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if(msg(i:i).ne.' ') go to 10
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enddo
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i=1
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10 nmsg=i+1
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if(mod(nmsg,2).eq.1) nmsg=nmsg+1 !Make it even
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nwave=nmsg*512*3/2
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do m=1,nmsg !Get character code numbers
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ic=m
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n=ichar(msg(ic:ic))
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C Calculate i in range 0-42:
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if(n.ge.ichar('0') .and. n.le.ichar('9')) i=n-ichar('0')
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if(msg(ic:ic).eq.'.') i=10
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if(msg(ic:ic).eq.',') i=11
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if(msg(ic:ic).eq.' ') i=12
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if(msg(ic:ic).eq.'/') i=13
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if(msg(ic:ic).eq.'#') i=14
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if(msg(ic:ic).eq.'?') i=15
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if(msg(ic:ic).eq.'$') i=16
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if(n.ge.ichar('a') .and. n.le.ichar('z')) i=n-ichar('a')+17
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if(n.ge.ichar('A') .and. n.le.ichar('Z')) i=n-ichar('A')+17
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imsg(m)=i
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enddo
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k=1
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do i=1,nmsg,2
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call gentone(x(k),-1,k) !Generate a sync tone
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call gentone(x(k),imsg(i),k) !First character
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call gentone(x(k),imsg(i+1),k) !Second character
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enddo
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do i=1,nwave
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iwave(i)=nint(32767.0*x(i))
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enddo
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return
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end
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