Merged master 8748
This commit is contained in:
Jordan Sherer
@@ -1,65 +0,0 @@
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subroutine gen9(msg0,ichk,msgsent,i4tone,itype)
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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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use packjt
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character*22 msg0
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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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if(msg0(1:1).eq.'@') then
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read(msg0(2:5),*,end=1,err=1) nfreq
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go to 2
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1 nfreq=1000
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2 i4tone(1)=nfreq
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else
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message=msg0
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do i=1,22
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if(ichar(message(i:i)).eq.0) then
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message(i:)=' '
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exit
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endif
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enddo
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do i=1,22 !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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call packmsg(message,i4Msg6BitWords,itype) !Pack into 12 6-bit bytes
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call unpackmsg(i4Msg6BitWords,msgsent) !Unpack to get msgsent
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if(ichk.ne.0) go to 999
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call entail(i4Msg6BitWords,i1Msg8BitBytes) !Add tail, make 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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i1EncodedBits(207)=0
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call interleave9(i1EncodedBits,1,i1ScrambledBits) !Interleave bits
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i1ScrambledBits(207)=0
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call packbits(i1ScrambledBits,69,3,i4DataSymbols) !Pk 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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endif
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999 return
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end subroutine gen9
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@@ -1,158 +0,0 @@
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subroutine decode65a(dd,npts,newdat,nqd,f0,nflip,mode65,ntrials, &
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naggressive,ndepth,ntol,mycall,hiscall,hisgrid,nexp_decode, &
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bVHF,sync2,a,dt,nft,nspecial,qual,nhist,nsmo,decoded)
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! Apply AFC corrections to a candidate JT65 signal, then decode it.
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use jt65_mod
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use timer_module, only: timer
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parameter (NMAX=60*12000) !Samples per 60 s
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real*4 dd(NMAX) !92 MB: raw data from Linrad timf2
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complex cx(NMAX/8) !Data at 1378.125 sps
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complex cx1(NMAX/8) !Data at 1378.125 sps, offset by 355.3 Hz
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complex c5x(NMAX/32) !Data at 344.53125 Hz
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complex c5a(512)
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real s2(66,126)
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real a(5)
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logical bVHF,first
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character decoded*22,decoded_best*22
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character mycall*12,hiscall*12,hisgrid*6
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character*27 cr
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data first/.true./,jjjmin/1000/,jjjmax/-1000/,cr/'(C) 2016, Joe Taylor - K1JT'/
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save
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! Mix sync tone to baseband, low-pass filter, downsample to 1378.125 Hz
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call timer('filbig ',0)
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call filbig(dd,npts,f0,newdat,cx,n5,sq0)
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if(mode65.eq.4) call filbig(dd,npts,f0+355.297852,newdat,cx1,n5,sq0)
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call timer('filbig ',1)
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! NB: cx has sample rate 12000*77125/672000 = 1378.125 Hz
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! Check for a shorthand message
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if(bVHF .and. mode65.ne.101) then
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call sh65(cx,n5,mode65,ntol,xdf,nspecial,sync2)
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if(nspecial.gt.0) then
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a=0.
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a(1)=xdf
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nflip=0
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endif
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endif
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if(nflip.eq.0) go to 900
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! Find best DF, drift, curvature, and DT. Start by downsampling to 344.53125 Hz
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call timer('fil6521 ',0)
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call fil6521(cx,n5,c5x,n6)
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call timer('fil6521 ',1)
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fsample=1378.125/4.
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call timer('afc65b ',0)
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! Best fit for DF, drift, banana-coefficient, and dt. fsample = 344.53125 S/s
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dtbest=dt
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call afc65b(c5x,n6,fsample,nflip,a,ccfbest,dtbest)
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call timer('afc65b ',1)
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dtbest=dtbest+0.003628 !Remove decimation filter and coh. integrator delay
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dt=dtbest !Return new, improved estimate of dt
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sync2=3.7e-4*ccfbest/sq0 !Constant is empirical
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if(mode65.eq.4) cx=cx1
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! Apply AFC corrections to the time-domain signal
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! Now we are back to using the 1378.125 Hz sample rate, enough to
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! accommodate the full JT65C bandwidth.
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a(3)=0
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call timer('twkfreq ',0)
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call twkfreq65(cx,n5,a)
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call timer('twkfreq ',1)
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! Compute spectrum for each symbol.
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nsym=126
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nfft=512
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df=1378.125/nfft
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j=int(dtbest*1378.125)
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call timer('sh_ffts ',0)
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c5a=cmplx(0.0,0.0)
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do k=1,nsym
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do i=1,nfft
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j=j+1
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if(j.ge.1 .and. j.le.NMAX/8) then
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c5a(i)=cx(j)
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else
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c5a(i)=0.
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endif
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enddo
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call four2a(c5a,nfft,1,1,1)
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do i=1,512
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jj=i
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if(i.gt.256) jj=i-512
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s1(jj,k)=real(c5a(i))**2 + aimag(c5a(i))**2
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enddo
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enddo
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call timer('sh_ffts ',1)
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call timer('dec65b ',0)
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qualbest=0.
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qual0=-1.e30
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minsmo=0
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maxsmo=0
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if(mode65.ge.2 .and. mode65.ne.101) then
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minsmo=nint(width/df)-1
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maxsmo=2*nint(width/df)
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endif
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nn=0
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do ismo=minsmo,maxsmo
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if(ismo.gt.0) then
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do j=1,126
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call smo121(s1(-255,j),512)
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if(j.eq.1) nn=nn+1
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if(nn.ge.4) then
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call smo121(s1(-255,j),512)
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if(j.eq.1) nn=nn+1
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endif
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enddo
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endif
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do i=1,66
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jj=i
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if(mode65.eq.2) jj=2*i-1
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if(mode65.eq.4) then
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ff=4*(i-1)*df - 355.297852
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jj=nint(ff/df)+1
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endif
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s2(i,1:126)=s1(jj,1:126)
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enddo
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nadd=ismo !### ??? ###
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call decode65b(s2,nflip,nadd,mode65,ntrials,naggressive,ndepth, &
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mycall,hiscall,hisgrid,nexp_decode,nqd,nft,qual,nhist,decoded)
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if(nft.eq.1) then
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nsmo=ismo
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param(9)=nsmo
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nsum=1
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exit
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else if(nft.eq.2) then
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if(qual.gt.qualbest) then
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decoded_best=decoded
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qualbest=qual
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nnbest=nn
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nsmobest=ismo
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endif
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endif
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if(qual.lt.qual0) exit
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qual0=qual
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enddo
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if(nft.eq.2) then
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decoded=decoded_best
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qual=qualbest
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nsmo=nsmobest
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param(9)=nsmo
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nn=nnbest
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endif
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call timer('dec65b ',1)
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900 return
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end subroutine decode65a
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