mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-18 10:01:57 -05:00
1a23757b26
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6122 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
114 lines
3.5 KiB
Fortran
114 lines
3.5 KiB
Fortran
subroutine jtmsk(id2,narg,line)
|
|
|
|
! Decoder for JTMSK
|
|
|
|
parameter (NMAX=30*12000)
|
|
parameter (NFFTMAX=512*1024)
|
|
parameter (NSPM=1404) !Samples per JTMSK message
|
|
integer*2 id2(0:NMAX) !Raw i*2 data, up to T/R = 30 s
|
|
real d(0:NMAX) !Raw r*4 data
|
|
real ty(703)
|
|
real yellow(703)
|
|
! real spk2(20)
|
|
! real fpk2(20)
|
|
! integer jpk2(20)
|
|
complex c(NFFTMAX) !Complex (analytic) data
|
|
complex cdat(24000) !Short segments, up to 2 s
|
|
complex cdat2(24000)
|
|
integer narg(0:11) !Arguments passed from calling pgm
|
|
character*22 msg,msg0 !Decoded message
|
|
character*80 line(100) !Decodes passed back to caller
|
|
common/tracer/ limtrace,lu
|
|
|
|
limtrace=-1
|
|
lu=12
|
|
! Parameters from GUI are in narg():
|
|
nutc=narg(0) !UTC
|
|
npts=min(narg(1),NMAX) !Number of samples in id2 (12000 Hz)
|
|
newdat=narg(3) !1==> new data, compute symbol spectra
|
|
minsync=narg(4) !Lower sync limit
|
|
npick=narg(5)
|
|
t0=0.001*narg(6)
|
|
t1=0.001*narg(7)
|
|
maxlines=narg(8) !Max # of decodes to return to caller
|
|
nmode=narg(9)
|
|
nrxfreq=narg(10) !Target Rx audio frequency (Hz)
|
|
ntol=narg(11) !Search range, +/- ntol (Hz)
|
|
|
|
nsnr0=-99
|
|
nline=0
|
|
line(1:100)(1:1)=char(0)
|
|
msg0=' '
|
|
msg=msg0
|
|
|
|
d(0:npts-1)=id2(0:npts-1)
|
|
rms=sqrt(dot_product(d(0:npts-1),d(0:npts-1))/npts)
|
|
d(0:npts-1)=d(0:npts-1)/rms
|
|
call timer('mskdt ',0)
|
|
call mskdt(d,npts,ty,yellow,nyel)
|
|
nyel=min(nyel,5)
|
|
call timer('mskdt ',1)
|
|
|
|
n=log(float(npts))/log(2.0) + 1.0
|
|
nfft=min(2**n,1024*1024)
|
|
call timer('analytic',0)
|
|
call analytic(d,npts,nfft,c) !Convert to analytic signal
|
|
call timer('analytic',1)
|
|
|
|
nbefore=NSPM
|
|
nafter=4*NSPM
|
|
! Process ping list (sorted by S/N) from top down.
|
|
do n=1,nyel
|
|
ia=ty(n)*12000.0 - nbefore
|
|
if(ia.lt.1) ia=1
|
|
ib=ia + nafter
|
|
if(ib.gt.NFFTMAX) ib=NFFTMAX
|
|
iz=ib-ia+1
|
|
cdat2(1:iz)=c(ia:ib) !Select nlen complex samples
|
|
ja=ia/NSPM + 1
|
|
jb=ib/NSPM
|
|
t0=ia/12000.0
|
|
! call msksync(cdat,iz,jpk2,fpk2,spk2)
|
|
! call softmsk(cdat,iz,jpk2,fpk2,spk2)
|
|
|
|
do itry=1,21
|
|
idf1=(itry/2) * 50
|
|
if(mod(itry,2).eq.1) idf1=-idf1
|
|
if(abs(idf1).gt.ntol) exit
|
|
fpk=idf1 + nrxfreq
|
|
call timer('tweak1 ',0)
|
|
call tweak1(cdat2,iz,1500.0-fpk,cdat)
|
|
call timer('tweak1 ',1)
|
|
|
|
call timer('syncmsk ',0)
|
|
call syncmsk(cdat,iz,jpk,ipk,idf,rmax,snr,metric,msg)
|
|
call timer('syncmsk ',1)
|
|
freq=fpk+idf
|
|
! write(72,4001) jpk,idf,nint(freq),rmax,snr,msg
|
|
!4001 format(3i6,2f9.2,2x,a22)
|
|
if(metric.eq.-9999) cycle !No output if no significant sync
|
|
t0=(ia+jpk)/12000.0
|
|
nsnr=nint(yellow(n)-2.0)
|
|
if(msg.ne.' ') then
|
|
if(msg.ne.msg0) then
|
|
nline=nline+1
|
|
nsnr0=-99
|
|
endif
|
|
if(nsnr.gt.nsnr0) then
|
|
call rectify_msk(cdat2(jpk:jpk+NSPM-1),msg,freq2)
|
|
write(line(nline),1020) nutc,nsnr,t0,nint(freq2),msg
|
|
1020 format(i6.6,i4,f5.1,i5,' & ',a22)
|
|
nsnr0=nsnr
|
|
go to 900
|
|
endif
|
|
msg0=msg
|
|
if(nline.ge.maxlines) go to 900
|
|
endif
|
|
enddo
|
|
enddo
|
|
|
|
900 if(line(1)(1:6).eq.' ') line(1)(1:1)=char(0)
|
|
|
|
return
|
|
end subroutine jtmsk
|