mirror of
https://github.com/saitohirga/WSJT-X.git
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121 lines
3.2 KiB
Fortran
121 lines
3.2 KiB
Fortran
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subroutine symspecx(k,ndiskdat,nb,nbslider,ntrperiod,pxdb,sdis,nkhz, &
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ihsym,nzap,slimit,lstrong)
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! k pointer to the most recent new data
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! ndiskdat 0/1 to indicate if data from disk
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! nb 0/1 status of noise blanker (off/on)
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! pxdb power (0-60 dB)
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! sdis spectrum for waterfall display
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! nkhz integer kHz portion of center frequency, e.g., 125 for 144.125
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! ihsym index number of this half-symbol (1-322)
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! nzap number of samples zero'ed by noise blanker
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parameter (NSMAX=1800*12000) !Total sample intervals per 30 minutes
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parameter (MAXFFT=32768) !Max length of FFTs
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parameter (NDMAX=1800*375)
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integer*2 id2
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real*8 ts,hsym
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real*8 fcenter
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common/jt8com/id2(NSMAX),ss(184,MAXFFT),savg(MAXFFT),fcenter,nutc,junk(20), &
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cdat(NDMAX)
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real*4 sdis(MAXFFT),w(MAXFFT)
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complex cx(MAXFFT)
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complex cx00(MAXFFT)
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real x0(0:2047)
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complex cx0(0:1023),cx1(0:1023)
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logical*1 lstrong(0:1023)
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equivalence (x0,cx0)
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data rms/999.0/,k0/99999999/,ntrperiod0/0/
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save
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if(k.gt.NSMAX) go to 999
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if(k.lt.nfft) then
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ihsym=0
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go to 999 !Wait for enough samples to start
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endif
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if(ntrperiod.ne.ntrperiod0) then
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nfft=960
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if(ntrperiod.eq.120) nfft=2048
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if(ntrperiod.eq.300) nfft=5376
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if(ntrperiod.eq.600) nfft=10752
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if(ntrperiod.eq.1800) nfft=32768
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nsps=8*nfft
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hsym=0.5d0*nsps
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pi=4.0*atan(1.0)
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do i=1,nfft
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w(i)=(sin(i*pi/nfft))**2 !Window
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enddo
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endif
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if(k.lt.k0) then
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ts=1.d0 - hsym
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savg=0.
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ihsym=0
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k1=0
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if(ndiskdat.eq.0) id2(k+1)=0. !### Should not be needed ??? ###
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endif
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k0=k
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nzap=0
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sigmas=1.5*(10.0**(0.01*nbslider)) + 0.7
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peaklimit=sigmas*max(10.0,rms)
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faclim=3.0
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px=0.
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nwindow=2
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nfft2=1024
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kstep=nfft2
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if(nwindow.ne.0) kstep=nfft2/2
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nblks=(k-k1)/kstep
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do nblk=1,nblks
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j=k1+1
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do i=0,nfft2-1
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x0(i)=id2(j+i)
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enddo
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call timf2x(k,nfft2,ntrperiod,nwindow,nb,peaklimit,faclim,cx0,cx1, &
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slimit,lstrong,px,nzap)
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do i=0,kstep-1
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cdat(j+i)=cx1(i)
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enddo
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k1=k1+kstep
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enddo
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npts=nfft !Samples used in each half-symbol FFT
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ts=ts+hsym
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ja=ts !Index of first sample
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jb=ja+npts-1 !Last sample
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i=0
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fac=0.0002
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do j=ja,jb !Copy data into cx, cy
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i=i+1
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cx(i)=fac*cdat(j)
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enddo
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if(nzap/178.lt.50 .and. (ndiskdat.eq.0 .or. ihsym.lt.280)) then
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nsum=nblks*kstep - nzap
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if(nsum.le.0) nsum=1
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rms=sqrt(0.5*px/nsum)
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endif
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pxdb=0.
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if(rms.gt.1.0) pxdb=20.0*log10(rms)
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if(pxdb.gt.60.0) pxdb=60.0
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cx00=cx
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ihsym=ihsym+1
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cx=w*cx00 !Apply window for 2nd forward FFT
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call four2a(cx,nfft,1,1,1) !Second forward FFT (X)
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n=min(184,ihsym)
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do i=1,nfft
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sx=real(cx(i))**2 + aimag(cx(i))**2
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ss(n,i)=sx
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sdis(i)=sx
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savg(i)=savg(i) + sx
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enddo
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nkhz=nint(1000.d0*(fcenter-int(fcenter)))
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if(fcenter.eq.0.d0) nkhz=125
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999 return
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end subroutine symspecx
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