mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-08 18:16:02 -05:00
f347e3755a
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2745 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
56 lines
2.0 KiB
Fortran
56 lines
2.0 KiB
Fortran
subroutine genjt9(msg0,msgsent,i4tone)
|
|
|
|
! Encodes a JT9 message and returns msgsent, the message as it will
|
|
! be decoded, and an integer array i4tone(85) of 9-FSK tone values
|
|
! in the range 0-8.
|
|
|
|
character*22 msg0
|
|
character*22 message !Message to be generated
|
|
character*22 msgsent !Message as it will be received
|
|
integer*4 i4Msg6BitWords(13) !72-bit message as 6-bit words
|
|
integer*1 i1Msg8BitBytes(13) !72 bits and zero tail as 8-bit bytes
|
|
integer*1 i1EncodedBits(207) !Encoded information-carrying bits
|
|
integer*1 i1ScrambledBits(207) !Encoded bits after interleaving
|
|
integer*4 i4DataSymbols(69) !Data symbols (values 0-7)
|
|
integer*4 i4GrayCodedSymbols(69) !Gray-coded symbols (values 0-7)
|
|
integer*4 i4tone(85) !Tone #s, data and sync (values 0-8)
|
|
include 'jt9sync.f90'
|
|
save
|
|
|
|
message=msg0
|
|
do i=1,22
|
|
if(ichar(message(i:i)).eq.0) then
|
|
message(i:)=' '
|
|
exit
|
|
endif
|
|
enddo
|
|
|
|
do i=1,22 !Omit leading blanks
|
|
if(message(1:1).ne.' ') exit
|
|
message=message(i+1:)
|
|
enddo
|
|
|
|
call packmsg(message,i4Msg6BitWords) !Pack message into 12 6-bit bytes
|
|
call unpackmsg(i4Msg6BitWords,msgsent) !Unpack to get msgsent
|
|
if(i4tone(1).eq.-99) go to 999
|
|
call entail(i4Msg6BitWords,i1Msg8BitBytes) !Add tail, convert to 8-bit bytes
|
|
nsym2=206
|
|
call encode232(i1Msg8BitBytes,nsym2,i1EncodedBits) !Encode K=32, r=1/2
|
|
call interleave9(i1EncodedBits,1,i1ScrambledBits) !Interleave the bits
|
|
call packbits(i1ScrambledBits,nsym2,3,i4DataSymbols) !Pack 3-bits into words
|
|
call graycode(i4DataSymbols,69,1,i4GrayCodedSymbols) !Apply Gray code
|
|
|
|
! Insert sync symbols at ntone=0 and add 1 to the data-tone numbers.
|
|
j=0
|
|
do i=1,85
|
|
if(isync(i).eq.1) then
|
|
i4tone(i)=0
|
|
else
|
|
j=j+1
|
|
i4tone(i)=i4GrayCodedSymbols(j)+1
|
|
endif
|
|
enddo
|
|
|
|
999 return
|
|
end subroutine genjt9
|