mirror of https://github.com/saitohirga/WSJT-X.git
47 lines
1.8 KiB
Fortran
47 lines
1.8 KiB
Fortran
subroutine genjt9(message,msgsent,i4tone)
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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 i4tone(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 i4Msg6BitWords(13) !72-bit message as 6-bit words
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integer*1 i1Msg8BitBytes(13) !72 bits and zero tail as 8-bit bytes
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integer*1 i1EncodedBits(207) !Encoded information-carrying bits
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integer*1 i1ScrambledBits(207) !Encoded bits after interleaving
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integer*4 i4DataSymbols(69) !Data symbols (values 0-7)
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integer*4 i4GrayCodedSymbols(69) !Gray-coded symbols (values 0-7)
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integer*4 i4tone(85) !Tone #s, data and sync (values 0-8)
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include 'jt9sync.f90'
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save
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do i=1,22
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if(message(1:1).ne.' ') exit
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message=message(i+1:)
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enddo
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call packmsg(message,i4Msg6BitWords) !Pack message into 12 6-bit bytes
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call unpackmsg(i4Msg6BitWords,msgsent) !Unpack to get msgsent
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if(i4tone(1).eq.-99) go to 999
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call entail(i4Msg6BitWords,i1Msg8BitBytes) !Add tail, convert to 8-bit bytes
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nsym2=206
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call encode232(i1Msg8BitBytes,nsym2,i1EncodedBits) !Encode K=32, r=1/2
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call interleave9(i1EncodedBits,1,i1ScrambledBits) !Interleave the bits
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call packbits(i1ScrambledBits,nsym2,3,i4DataSymbols) !Pack 3-bits into words
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call graycode(i4DataSymbols,69,1,i4GrayCodedSymbols) !Apply Gray code
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! Insert sync symbols at 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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i4tone(i)=0
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else
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j=j+1
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i4tone(i)=i4GrayCodedSymbols(j)+1
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endif
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enddo
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999 return
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end subroutine genjt9
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