2016-01-11 10:00:43 -05:00
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module jt65_decode
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integer, parameter :: NSZ=3413, NZMAX=60*12000, NFFT=1000
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type :: jt65_decoder
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procedure(jt65_decode_callback), pointer :: callback => null()
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contains
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procedure :: decode
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end type jt65_decoder
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!
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! Callback function to be called with each decode
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!
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abstract interface
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subroutine jt65_decode_callback (this, utc, sync, snr, dt, freq, drift, &
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decoded, ft, qual, candidates, tries, total_min, hard_min, aggression)
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import jt65_decoder
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implicit none
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class(jt65_decoder), intent(inout) :: this
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integer, intent(in) :: utc
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real, intent(in) :: sync
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integer, intent(in) :: snr
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real, intent(in) :: dt
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integer, intent(in) :: freq
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integer, intent(in) :: drift
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character(len=22), intent(in) :: decoded
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integer, intent(in) :: ft
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integer, intent(in) :: qual
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integer, intent(in) :: candidates
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integer, intent(in) :: tries
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integer, intent(in) :: total_min
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integer, intent(in) :: hard_min
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integer, intent(in) :: aggression
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end subroutine jt65_decode_callback
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end interface
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contains
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subroutine decode(this,callback,dd0,npts,newdat,nutc,nf1,nf2,nfqso,ntol,nsubmode, &
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minsync,nagain,n2pass,nrobust,ntrials,naggressive,ndepth, &
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mycall,hiscall,hisgrid,nexp_decode)
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! Process dd0() data to find and decode JT65 signals.
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use timer_module, only: timer
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include 'constants.f90'
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class(jt65_decoder), intent(inout) :: this
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procedure(jt65_decode_callback) :: callback
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real, intent(in) :: dd0(NZMAX)
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integer, intent(in) :: npts, nutc, nf1, nf2, nfqso, ntol &
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, nsubmode, minsync, n2pass, ntrials, naggressive, ndepth &
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, nexp_decode
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logical, intent(in) :: newdat, nagain, nrobust
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character(len=12), intent(in) :: mycall, hiscall
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character(len=6), intent(in) :: hisgrid
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real dd(NZMAX)
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real ss(322,NSZ)
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real savg(NSZ)
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real a(5)
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character*22 decoded,decoded0
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type candidate
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real freq
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real dt
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real sync
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end type candidate
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type(candidate) ca(300)
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type accepted_decode
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real freq
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real dt
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real sync
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character*22 decoded
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end type accepted_decode
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type(accepted_decode) dec(50)
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logical :: first_time, robust
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integer h0(0:11),d0(0:11),ne(0:11)
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real r0(0:11)
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common/decstats/ntry65a,ntry65b,n65a,n65b,num9,numfano
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common/steve/thresh0
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common/test000/ncandidates,nhard_min,nsoft_min,nera_best,nrtt1000, &
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ntotal_min,ntry,nq1000,npp1 !### TEST ONLY ###
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! 0 1 2 3 4 5 6 7 8 9 10 11
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data h0/41,42,43,43,44,45,46,47,48,48,49,49/
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data d0/71,72,73,74,76,77,78,80,81,82,83,83/
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! 0 1 2 3 4 5 6 7 8 9 10 11
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data r0/0.70,0.72,0.74,0.76,0.78,0.80,0.82,0.84,0.86,0.88,0.90,0.90/
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save
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this%callback => callback
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first_time=newdat
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robust=nrobust
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dd=dd0
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ndecoded=0
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do ipass=1,n2pass ! 2-pass decoding loop
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first_time=.true.
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if(ipass.eq.1) then !first-pass parameters
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thresh0=2.5
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nsubtract=1
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elseif( ipass.eq.2 ) then !second-pass parameters
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thresh0=2.5
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nsubtract=0
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endif
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if(n2pass.lt.2) nsubtract=0
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! if(newdat) then
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call timer('symsp65 ',0)
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ss=0.
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call symspec65(dd,npts,ss,nhsym,savg) !Get normalized symbol spectra
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call timer('symsp65 ',1)
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! endif
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nfa=nf1
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nfb=nf2
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if(naggressive.gt.0 .and. ntol.lt.1000) then
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nfa=max(200,nfqso-ntol)
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nfb=min(4000,nfqso+ntol)
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thresh0=1.0
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endif
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! robust = .false.: use float ccf. Only if ncand>50 fall back to robust (1-bit) ccf
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! robust = .true. : use only robust (1-bit) ccf
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ncand=0
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if(.not.robust) then
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call timer('sync65 ',0)
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call sync65(ss,nfa,nfb,naggressive,ntol,nhsym,ca,ncand,0)
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call timer('sync65 ',1)
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endif
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if(ncand.gt.50) robust=.true.
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if(robust) then
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ncand=0
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call timer('sync65 ',0)
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call sync65(ss,nfa,nfb,naggressive,ntol,nhsym,ca,ncand,1)
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call timer('sync65 ',1)
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endif
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call fqso_first(nfqso,ntol,ca,ncand)
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nvec=ntrials
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if(ncand.gt.75) then
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! write(*,*) 'Pass ',ipass,' ncandidates too large ',ncand
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nvec=100
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endif
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df=12000.0/NFFT !df = 12000.0/8192 = 1.465 Hz
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mode65=2**nsubmode
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nflip=1 !### temporary ###
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nqd=0
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decoded0=""
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freq0=0.
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do icand=1,ncand
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freq=ca(icand)%freq
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dtx=ca(icand)%dt
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sync1=ca(icand)%sync
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if(ipass.eq.1) ntry65a=ntry65a + 1
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if(ipass.eq.2) ntry65b=ntry65b + 1
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call timer('decod65a',0)
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call decode65a(dd,npts,first_time,nqd,freq,nflip,mode65,nvec, &
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naggressive,ndepth,mycall,hiscall,hisgrid,nexp_decode, &
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sync2,a,dtx,nft,qual,nhist,decoded)
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call timer('decod65a',1)
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n=naggressive
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rtt=0.001*nrtt1000
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if(nft.lt.2) then
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if(nhard_min.gt.50) cycle
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if(nhard_min.gt.h0(n)) cycle
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if(ntotal_min.gt.d0(n)) cycle
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if(rtt.gt.r0(n)) cycle
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endif
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! !### Suppress false decodes in crowded HF bands ###
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! if(naggressive.eq.0 .and. ntrials.le.10000) then
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! if(ntry.eq.ntrials) then
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! if(nhard_min.ge.42 .or. ntotal_min.ge.71) cycle
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! endif
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! endif
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if(decoded.eq.decoded0 .and. abs(freq-freq0).lt. 3.0 .and. &
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minsync.ge.0) cycle !Don't display dupes
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if(decoded.ne.' ' .or. minsync.lt.0) then
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if( nsubtract .eq. 1 ) then
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call timer('subtr65 ',0)
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call subtract65(dd,npts,freq,dtx)
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call timer('subtr65 ',1)
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endif
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nfreq=nint(freq+a(1))
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ndrift=nint(2.0*a(2))
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s2db=10.0*log10(sync2) - 35 !### empirical ###
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nsnr=nint(s2db)
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if(nsnr.lt.-30) nsnr=-30
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if(nsnr.gt.-1) nsnr=-1
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ndupe=0 ! de-dedupe
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do i=1, ndecoded
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if(decoded==dec(i)%decoded) then
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ndupe=1
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exit
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endif
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enddo
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if(ndupe.ne.1 .or. minsync.lt.0) then
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if(ipass.eq.1) n65a=n65a + 1
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if(ipass.eq.2) n65b=n65b + 1
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ndecoded=ndecoded+1
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dec(ndecoded)%freq=freq+a(1)
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dec(ndecoded)%dt=dtx
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dec(ndecoded)%sync=sync2
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dec(ndecoded)%decoded=decoded
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nqual=min(qual,9999.0)
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! if(nqual.gt.10) nqual=10
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if (associated(this%callback)) then
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call this%callback(nutc,sync1,nsnr,dtx-1.0,nfreq,ndrift,decoded &
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,nft,nqual,ncandidates,ntry,ntotal_min,nhard_min,naggressive)
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end if
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endif
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decoded0=decoded
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freq0=freq
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if(decoded0.eq.' ') decoded0='*'
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endif
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enddo !candidate loop
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if(ndecoded.lt.1) exit
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enddo !two-pass loop
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return
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end subroutine decode
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end module jt65_decode
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