mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-13 23:51:49 -05:00
165 lines
4.9 KiB
Fortran
165 lines
4.9 KiB
Fortran
subroutine q65b(nutc,nqd,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
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mycall0,hiscall0,hisgrid,mode_q65,f0,fqso,newdat,nagain,max_drift,idec)
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! This routine provides an interface between MAP65 and the Q65 decoder
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! in WSJT-X. All arguments are input data obtained from the MAP65 GUI.
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! Raw Rx data are available as the 96 kHz complex spectrum ca(MAXFFT1)
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! in common/cacb. If xpol is true, we also have cb(MAXFFT1) for the
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! orthogonal polarization. Decoded messages are sent back to the GUI
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! on stdout.
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! use wavhdr
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use q65_decode
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use wideband_sync
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use timer_module, only: timer
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parameter (MAXFFT1=5376000) !56*96000
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parameter (MAXFFT2=336000) !56*6000 (downsampled by 1/16)
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parameter (NMAX=60*12000)
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! type(hdr) h !Header for the .wav file
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integer*2 iwave(60*12000)
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complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
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complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
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logical xpol
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integer ipk1(1)
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real*8 fcenter,freq0
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character*12 mycall0,hiscall0
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character*12 mycall,hiscall
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character*6 hisgrid
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character*4 grid4
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character*80 line
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character*80 wsjtx_dir
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common/cacb/ca,cb
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save
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open(9,file='wsjtx_dir.txt',status='old')
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read(9,'(a)') wsjtx_dir !Establish the working directory
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close(9)
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if(mycall0(1:1).ne.' ') mycall=mycall0
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if(hiscall0(1:1).ne.' ') hiscall=hiscall0
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if(hisgrid(1:4).ne.' ') grid4=hisgrid(1:4)
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! Find best frequency and ipol from sync_dat, the "orange sync curve".
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df3=96000.0/32768.0
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ifreq=nint((1000.0*f0)/df3)
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ia=nint(ifreq-ntol/df3)
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ib=nint(ifreq+ntol/df3)
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ipk1=maxloc(sync(ia:ib)%ccfmax)
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ipk=ia+ipk1(1)-1
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snr1=sync(ipk)%ccfmax
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ipol=1
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if(xpol) ipol=sync(ipk)%ipol
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nfft1=MAXFFT1
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nfft2=MAXFFT2
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df=96000.0/NFFT1
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if(nfsample.eq.95238) then
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nfft1=5120000
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nfft2=322560
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df=96000.0/nfft1
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endif
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nh=nfft2/2
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f_mouse=1000.0*(fqso+48.0) + mousedf
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f_ipk=ipk*df3
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k0=nint((ipk*df3-1000.0)/df)
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if(nagain.eq.1) k0=nint((f_mouse-1000.0)/df)
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if(k0.lt.nh .or. k0.gt.MAXFFT1-nfft2+1) go to 900
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if(snr1.lt.1.5) go to 900 !### Threshold needs work? ###
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fac=1.0/nfft2
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cx(0:nfft2-1)=ca(k0:k0+nfft2-1)
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cx=fac*cx
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if(xpol) then
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cy(0:nfft2-1)=cb(k0:k0+nfft2-1)
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cy=fac*cy
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endif
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! Here cx and cy (if xpol) are frequency-domain data around the selected
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! QSO frequency, taken from the full-length FFT computed in filbig().
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! Values for fsample, nfft1, nfft2, df, and the downsampled data rate
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! are as follows:
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! fSample nfft1 df nfft2 fDownSampled
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! (Hz) (Hz) (Hz)
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!----------------------------------------------------
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! 96000 5376000 0.017857143 336000 6000.000
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! 95238 5120000 0.018601172 322560 5999.994
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if(ipol.eq.1) cz(0:MAXFFT2-1)=cx
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if(ipol.eq.2) cz(0:MAXFFT2-1)=0.707*(cx+cy)
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if(ipol.eq.3) cz(0:MAXFFT2-1)=cy
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if(ipol.eq.4) cz(0:MAXFFT2-1)=0.707*(cx-cy)
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cz(MAXFFT2)=0.
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! Roll off below 500 Hz and above 2500 Hz.
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ja=nint(500.0/df)
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jb=nint(2500.0/df)
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do i=0,ja
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r=0.5*(1.0+cos(i*3.14159/ja))
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cz(ja-i)=r*cz(ja-i)
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cz(jb+i)=r*cz(jb+i)
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enddo
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cz(ja+jb+1:)=0.
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!Transform to time domain (real), fsample=12000 Hz
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call four2a(cz,2*nfft2,1,1,-1)
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do i=0,nfft2-1
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j=nfft2-1-i
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iwave(2*i+2)=nint(real(cz(j))) !Note the reversed order!
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iwave(2*i+1)=nint(aimag(cz(j)))
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enddo
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iwave(2*nfft2+1:)=0
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! open(30,file='000000_0001.wav',status='unknown',access='stream')
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! h=default_header(12000,NMAX)
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! write(30) h,iwave
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! close(30)
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nsubmode=mode_q65-1
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nfa=990 !Tight limits around ipk for the wideband decode
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nfb=1010
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if(nagain.eq.1) then !For nagain=1, use limits of +/- ntol
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nfa=max(100,1000-ntol)
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nfb=min(2500,1000+ntol)
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endif
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nsnr0=-99 !Default snr for no decode
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! NB: Frequency of ipk is now shifted to 1000 Hz.
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call map65_mmdec(nutc,iwave,nqd,nsubmode,nfa,nfb,1000,ntol, &
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newdat,nagain,max_drift,mycall,hiscall,hisgrid)
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MHz=fcenter
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freq0=MHz + 0.001*ikhz
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if(nsnr0.gt.-99) then
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nq65df=nint(1000*(0.001*k0*df+nkhz_center-48.0+1.000-1.27046-ikhz))-nfcal
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nq65df=nq65df + nfreq0 - 1000
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if(nqd.eq.1 .and. abs(nq65df-mousedf).lt.ntol) then
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write(line,1020) ikhz,nq65df,45*(ipol-1),nutc,xdt0,nsnr0,msg0(1:27),cq0
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1020 format('!',i3.3,i5,i4,i6.4,f5.1,i5,' : ',a27,a3)
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write(*,1100) trim(line)
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1100 format(a)
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endif
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! Write to lu 26, for Messages and Band Map windows
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write(26,1014) freq0,nq65df,0,0,0,xdt0,45*(ipol-1),0, &
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nsnr0,nutc,msg0(1:22),':',char(ichar('A') + mode_q65-1)
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1014 format(f8.3,i5,3i3,f5.1,i4,i3,i4,i5.4,4x,a22,2x,a1,3x,':',a1)
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! Write to file map65_rx.log:
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write(21,1110) freq0,nq65df,xdt0,45*(ipol-1),nsnr0,nutc,msg0(1:28),cq0
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1110 format(f8.3,i5,f5.1,2i4,i5.4,2x,a28,': A',2x,a3)
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endif
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900 close(13)
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close(17)
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call flush(6)
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idec=-1
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read(cq0(2:2),*) idec
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return
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end subroutine q65b
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