mirror of https://github.com/saitohirga/WSJT-X.git
52 lines
1.8 KiB
Fortran
52 lines
1.8 KiB
Fortran
subroutine genjt9(message,minutes,msgsent,d6)
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! Encodes a JT9 message and returns msgsent, the message as it will
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! be decoded, and an integer array d6(85) of 9-FSK tone values
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! in the range 0-8.
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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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integer*4 d0(13) !72-bit message as 6-bit words
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integer*1 d1(13) !72 bits and zero tail as 8-bit bytes
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integer*1 d2(207) !Encoded information-carrying bits
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integer*1 d3(207) !Bits from d2, after interleaving
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integer*4 d4(69) !Symbols from d3, values 0-7
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integer*4 d5(69) !Gray-coded symbols, values 0-7
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integer*4 d6(85) !Channel symbols including sync, values 0-8
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integer isync(85) !Sync vector
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data isync/ &
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1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1,0,0,0,0, &
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1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,1,0, &
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0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0, &
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0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0, &
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1,0,0,0,1/
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save
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call packmsg(message,d0) !Pack message into 12 6-bit bytes
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call unpackmsg(d0,msgsent) !Unpack d0 to get msgsent
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call entail(d0,d1) !Add tail, convert to 8-bit bytes
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nsym2=206
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call encode232(d1,nsym2,d2) !Convolutional code, K=32, r=1/2
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call interleave9(d2,1,d3) !Interleave the single bits
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call packbits(d3,nsym2,3,d4) !Pack 3-bit groups into words
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! d5=d4
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! print*,d5
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call graycode(d4,69,1,d5) !Apply Gray code
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! Insert sync symbols (ntone=0) and add 1 to the data-tone numbers.
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j=0
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do i=1,85
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if(isync(i).eq.1) then
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d6(i)=0
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else
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j=j+1
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d6(i)=d5(j)+1
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endif
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enddo
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return
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end subroutine genjt9
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