WSJT-X/map65/libm65/q65b.f90

163 lines
4.9 KiB
Fortran

subroutine q65b(nutc,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
mycall0,hiscall0,hisgrid,mode_q65)
! 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
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
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
character*12 mycall0,hiscall0
character*12 mycall,hiscall
character*6 hisgrid
character*4 grid4
character*80 line
character*80 wsjtx_dir
common/cacb/ca,cb
save
open(9,file='wsjtx_dir.txt',status='old')
read(9,'(a)') wsjtx_dir !Establish the working directory
close(9)
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".
ff=ikhz+0.001*(mousedf+1270.459) !supposed freq of sync tone
ifreq=nint(1000.0*(ff-nkhz_center+48)*32768.0/96000.0) !Freq index into ss(4,322,32768)
dff=96000.0/32768.0
ia=nint(ifreq-ntol/dff)
ib=nint(ifreq+ntol/dff)
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)*dff)
snr1=sync_dat(ipk,2)
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=(1000*(ikhz-ikhz0+48.0) + 1270 - 1000 + nfcal + mousedf + nhz)/df
k0=nint((ipk*dff-1000.0)/df)
! print*,'#',snr1,ipk*dff,k0*df
if(k0.lt.nh .or. k0.gt.nfft1-nh) go to 900
if(snr1.lt.2.0) go to 900
fac=1.0/nfft2
cx(0:nfft2-1)=ca(k0:k0+nfft2-1)
cx=fac*cx
if(xpol) then
cy(0:nfft2-1)=cb(k0:k0+nfft2-1)
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.
!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)
call map65_mmdec(nutc,iwave,nsubmode,nfa,nfb,1000+mousedf,ntol, &
newdat,nagain,mycall,hiscall,hisgrid)
call timer('mmdec ',1)
nfreq=nfreq0 + nhz + mousedf - 1000
freq0=144.0 + 0.001*ikhz
! write(*,3001) nfa,nfb,mousedf,ntol,newdat,nagain,nhz,nsnr0, &
! 0.001*ipk*dff,0.001*ifreq*dff,0.001*k0*df
!3001 format('#',8i5,3f10.4)
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)
write(*,1100) trim(line)
1100 format(a)
! 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,msg40(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)
! Write to file map65_rx.log:
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)
endif
900 close(13)
close(17)
write(*,1900)
1900 format('<DecodeFinished>')
call flush(6)
return
end subroutine q65b