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https://github.com/saitohirga/WSJT-X.git
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bf364de0af
This builds on the static phase compensation in the MSK144 decoder and the phase analysis and polynomial fitting capabilities also in teh MSK144 decoder, by allowing captured data to be selected for phase equalization from the WSJT-X UI. Reads captured phase compensation curve estimate files containing fitted polynomial coefficients and measured phase data from MSK144 receptions. Intent is to select a compensation curve that is from a known transmitter like an SDR which have good phase linearity. Phase plots and compensation polynomials may be viewed and compared with the current compensation polynomial. A suitable polynomial can be applied to be use in all further decoding of MSK144 signals. Plots of the currently selected polynomial and its modified higher order terms polynomial which is actually used in equalization (this plot may be dropped - it is just for kicks at the moment). When a captured phase analysis file is loaded plots of the measured phase and the proposed best fit polynomial are shown. Basic maintenance is also included allowing clearing and loading captured plots and an option to revert to a flat no equalization curve. More to come on this as amplitude equalization is also possible, this will probably be similar, maybe even plotted on the same graph with dual axes for phase and amplitude. Amplitude correction from a measured reference spectrum could be viewed and selected for equalization for all modes. TBC... This change also introduces the QCustomPlot 3rd party widget. Currently this is statically linked from a qcp library built by the WSJT-X CMake script. This will probably be migrated to a shared object (DLL) build as a CMake external project, once some CMake script re-factoring has been completed, which is more in line with the QCustomPlot author's intentions. This will allow efficient reuse in other tools shipped with WSJT-X. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7570 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
79 lines
2.4 KiB
Fortran
79 lines
2.4 KiB
Fortran
subroutine analytic(d,npts,nfft,c,dpc,bseq,bdeq)
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! Convert real data to analytic signal
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parameter (NFFTMAX=1024*1024)
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real d(npts) ! passband signal
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real h(NFFTMAX/2) ! real BPF magnitude
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real dpc(5) ! dynamic phase coeffs
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real sac(5),saclast(5) ! amp coeffs
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real fp
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complex corrs(NFFTMAX/2) ! allpass static phase correction
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complex corrd(NFFTMAX/2) ! allpass overall phase correction
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complex c(NFFTMAX) ! analytic signal
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logical*1 bseq ! boolean static equalizer flag
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logical*1 bdeq ! boolean dynamic equalizer flag
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logical*1 bseqlast
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data nfft0/0/
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data bseqlast/.false./
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data saclast/1.0,0.0,0.0,0.0,0.0/
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data sac/1.0,0.05532,0.11438,0.12918,0.09274/ ! amp coeffs for TS2000
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save corrs,corrd,nfft0,h,sac,saclast,pi,t,beta
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df=12000.0/nfft
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nh=nfft/2
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if( nfft.ne.nfft0 ) then
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pi=4.0*atan(1.0)
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t=1.0/2000.0
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beta=0.1
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do i=1,nh+1
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ff=(i-1)*df
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f=ff-1500.0
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h(i)=1.0
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if(abs(f).gt.(1-beta)/(2*t) .and. abs(f).le.(1+beta)/(2*t)) then
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h(i)=h(i)*0.5*(1+cos((pi*t/beta )*(abs(f)-(1-beta)/(2*t))))
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elseif( abs(f) .gt. (1+beta)/(2*t) ) then
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h(i)=0.0
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endif
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enddo
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nfft0=nfft
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endif
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if( any(saclast .ne. sac) ) then
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saclast=sac
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do i=1,nh+1
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ff=(i-1)*df
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f=ff-1500.0
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fp=f/1000.0
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corrs(i)=sac(1)+fp*(sac(2)+fp*(sac(3)+fp*(sac(4)+fp*sac(5))))
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pd=fp*fp*(dpc(3)+fp*(dpc(4)+fp*dpc(5))) ! ignore 1st two terms
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corrd(i)=cmplx(cos(pd),sin(pd))
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enddo
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endif
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fac=2.0/nfft
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c(1:npts)=fac*d(1:npts)
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c(npts+1:nfft)=0.
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call four2a(c,nfft,1,-1,1) !Forward c2c FFT
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if( (.not. bseq) .and. (.not. bdeq) ) then
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c(1:nh+1)=h(1:nh+1)*c(1:nh+1)
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else if( bseq .and. (.not. bdeq) ) then
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c(1:nh+1)=h(1:nh+1)*corrs(1:nh+1)*c(1:nh+1)
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else if( (.not. bseq) .and. bdeq ) then
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c(1:nh+1)=h(1:nh+1)*corrd(1:nh+1)*c(1:nh+1)
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else if( bseq .and. bdeq ) then
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c(1:nh+1)=h(1:nh+1)*corrs(1:nh+1)*corrd(1:nh+1)*c(1:nh+1)
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endif
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c(1)=0.5*c(1) !Half of DC term
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c(nh+2:nfft)=0. !Zero the negative frequencies
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call four2a(c,nfft,1,1,1) !Inverse c2c FFT
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return
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end subroutine analytic
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