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99 lines
2.4 KiB
Fortran
99 lines
2.4 KiB
Fortran
subroutine genft4slow(msg0,ichk,msgsent,msgbits,i4tone)
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! Encode an FT4 message
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! Input:
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! - msg0 requested message to be transmitted
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! - ichk if ichk=1, return only msgsent
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! - msgsent message as it will be decoded
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! - i4tone array of audio tone values, {0,1,2,3}
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! Frame structure:
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! s4 d24 s4 d24 s4 d24 s4 d24 s4 d24 s4
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! Message duration: TxT = 144*9600/12000 = 115.2 s
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use packjt77
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include 'ft4s_params.f90'
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character*37 msg0
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character*37 message !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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character*24 c24
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integer*4 i4tone(NN),itmp(ND)
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integer*1 codeword(2*ND)
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integer*1 msgbits(101),rvec(77)
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integer icos4a(4),icos4b(4),icos4c(4),icos4d(4),icos4e(4),icos4f(4)
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integer ncrc24
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logical unpk77_success
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data icos4a/0,1,3,2/
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data icos4b/1,0,2,3/
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data icos4c/2,3,1,0/
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data icos4d/3,2,0,1/
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data icos4e/0,2,3,1/
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data icos4f/1,2,0,3/
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data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
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1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
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0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
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message=msg0
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do i=1, 37
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if(ichar(message(i:i)).eq.0) then
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message(i:37)=' '
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exit
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endif
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enddo
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do i=1,37 !Strip leading blanks
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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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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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msgbits=0
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read(c77,'(77i1)') msgbits(1:77)
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call get_crc24(msgbits,101,ncrc24)
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write(c24,'(b24.24)') ncrc24
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read(c24,'(24i1)') msgbits(78:101)
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if(ichk.eq.1) go to 999
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if(unpk77_success) go to 2
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1 msgbits=0
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itone=0
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msgsent='*** bad message *** '
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go to 999
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entry get_ft4slow_tones_from_101bits(msgbits,i4tone)
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2 call encode240_101(msgbits,codeword)
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! Grayscale mapping:
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! bits tone
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! 00 0
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! 01 1
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! 11 2
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! 10 3
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do i=1,ND
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is=codeword(2*i)+2*codeword(2*i-1)
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if(is.le.1) itmp(i)=is
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if(is.eq.2) itmp(i)=3
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if(is.eq.3) itmp(i)=2
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enddo
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i4tone(1:4)=icos4a
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i4tone(5:28)=itmp(1:24)
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i4tone(29:32)=icos4b
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i4tone(33:56)=itmp(25:48)
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i4tone(57:60)=icos4c
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i4tone(61:84)=itmp(49:72)
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i4tone(85:88)=icos4d
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i4tone(89:112)=itmp(73:96)
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i4tone(113:116)=icos4e
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i4tone(117:140)=itmp(97:120)
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i4tone(141:144)=icos4f
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999 return
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end subroutine genft4slow
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