WSJT-X/map65/libm65/q65b.f90

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4.6 KiB
Fortran
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subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
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mycall0,hiscall0,hisgrid,mode_q65)
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! This routine provides an interface between MAP65 and the Q65 decoder
! in WSJT-X. All arguments are input data obtained from the MAP65 GUI.
! Raw Rx data are available as the 96 kHz complex spectrum ca(MAXFFT1)
! in common/cacb. If xpol is true, we also have cb(MAXFFT1) for the
! orthogonal polarization. Decoded messages are sent back to the GUI
! on stdout.
! use wavhdr
use q65_decode
use wideband_sync
use timer_module, only: timer
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parameter (MAXFFT1=5376000) !56*96000
parameter (MAXFFT2=336000) !56*6000 (downsampled by 1/16)
parameter (NMAX=60*12000)
! type(hdr) h !Header for the .wav file
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integer*2 iwave(60*12000)
complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
logical xpol
integer ipk1(1)
real*8 fcenter,freq0
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character*12 mycall0,hiscall0
character*12 mycall,hiscall
character*6 hisgrid
character*4 grid4
character*80 line
character*80 wsjtx_dir
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common/cacb/ca,cb
save
open(9,file='wsjtx_dir.txt',status='old')
read(9,'(a)') wsjtx_dir !Establish the working directory
close(9)
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if(mycall0(1:1).ne.' ') mycall=mycall0
if(hiscall0(1:1).ne.' ') hiscall=hiscall0
if(hisgrid(1:4).ne.' ') grid4=hisgrid(1:4)
! Find best frequency and ipol from sync_dat, the "orange sync curve".
df3=96000.0/32768.0
ff=ikhz+0.001*(mousedf+nfcal+1270.459) !Supposed freq of sync tone
ifreq=nint(1000.0*(ff-nkhz_center+48)/df3) !Freq index into ss(4,322,32768)
ia=nint(ifreq-ntol/df3)
ib=nint(ifreq+ntol/df3)
ipk1=maxloc(sync_dat(ia:ib,2))
ipk=ia+ipk1(1)-1
ipol=1
if(xpol) ipol=nint(sync_dat(ipk,4))
nhz=nint((ipk-ifreq)*df3)
snr1=sync_dat(ipk,2)
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nfft1=MAXFFT1
nfft2=MAXFFT2
df=96000.0/NFFT1
if(nfsample.eq.95238) then
nfft1=5120000
nfft2=322560
df=96000.0/nfft1
endif
nh=nfft2/2
ikhz0=nint(1000.0*(fcenter-int(fcenter)))
k0=nint((ipk*df3-1000.0)/df)
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if(k0.lt.nh .or. k0.gt.nfft1-nh) go to 900
if(snr1.lt.2.0) go to 900
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fac=1.0/nfft2
cx(0:nfft2-1)=ca(k0:k0+nfft2-1)
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cx=fac*cx
if(xpol) then
cy(0:nfft2-1)=cb(k0:k0+nfft2-1)
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cy=fac*cy
endif
! Here cx and cy (if xpol) are frequency-domain data around the selected
! QSO frequency, taken from the full-length FFT computed in filbig().
! Values for fsample, nfft1, nfft2, df, and the downsampled data rate
! are as follows:
! fSample nfft1 df nfft2 fDownSampled
! (Hz) (Hz) (Hz)
!----------------------------------------------------
! 96000 5376000 0.017857143 336000 6000.000
! 95238 5120000 0.018601172 322560 5999.994
if(ipol.eq.1) cz(0:MAXFFT2-1)=cx
if(ipol.eq.2) cz(0:MAXFFT2-1)=0.707*(cx+cy)
if(ipol.eq.3) cz(0:MAXFFT2-1)=cy
if(ipol.eq.4) cz(0:MAXFFT2-1)=0.707*(cx-cy)
cz(MAXFFT2)=0.
! Roll off below 500 Hz and above 2500 Hz.
ja=nint(500.0/df)
jb=nint(2500.0/df)
do i=0,ja
r=0.5*(1.0+cos(i*3.14159/ja))
cz(ja-i)=r*cz(ja-i)
cz(jb+i)=r*cz(jb+i)
enddo
cz(ja+jb+1:)=0.
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!Transform to time domain (real), fsample=12000 Hz
call four2a(cz,2*nfft2,1,1,-1)
do i=0,nfft2-1
j=nfft2-1-i
iwave(2*i+2)=nint(real(cz(j))) !Note the reversed order!
iwave(2*i+1)=nint(aimag(cz(j)))
enddo
iwave(2*nfft2+1:)=0
!###
! h=default_header(12000,NMAX)
! open(60,file='000000_0001.wav',access='stream',status='unknown')
! write(60) h,iwave
! close(60)
!###
nsubmode=mode_q65-1
nfa=max(100,1000-ntol)
nfb=min(4900,1000+ntol)
newdat=1
nagain=0
nsnr0=-99 !Default snr for no decode
call timer('mmdec ',0)
! NB: Frequency of ipk is now shifted to 1000 Hz.
call map65_mmdec(nutc,iwave,nsubmode,nfa,nfb,1000,ntol, &
newdat,nagain,mycall,hiscall,hisgrid)
call timer('mmdec ',1)
nfreq=nfreq0 + nhz + mousedf - 1000
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freq0=144.0 + 0.001*ikhz
if(nsnr0.gt.-99) then
write(line,1020) ikhz,nfreq,45*(ipol-1),nutc,xdt0,nsnr0,msg0(1:27),cq0
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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! Should write to lu 26 here, for Messages and Band Map windows ?
write(26,1014) freq0,nfreq0,0,0,0,xdt0,ipol0,0, &
nsnr0,nutc,msg0(1:22),':',char(ichar('A') + mode_q65-1)
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,nfreq,xdt0,45*(ipol-1),nsnr0,nutc,msg0(1:28),cq0
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)
close(17)
call flush(6)
return
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end subroutine q65b