mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 20:58:55 -05:00
118 lines
3.1 KiB
Fortran
118 lines
3.1 KiB
Fortran
|
program jt4sim
|
||
|
|
|
||
|
|
! Generate simulated data for testing the JT4 decoder
|
||
|
|
|
||
|
|
use wavhdr
|
||
|
|
use packjt
|
||
|
|
use jt4
|
||
|
|
parameter (NMAX=60*12000)
|
||
|
|
type(hdr) h
|
||
|
|
integer*2 iwave(NMAX) !Generated waveform
|
||
|
|
real*4 dat(NMAX)
|
||
|
|
real*4 r(2)
|
||
|
|
real*8 f0,f,dt,twopi,phi,dphi0,dphi,baud,fspread,fsample,freq,sps
|
||
|
|
character message*22,msgsent*22,arg*8,fname*11,submode*1
|
||
|
|
|
||
|
|
integer*4 itone(206) !Channel symbols (values 0-8)
|
||
|
|
|
||
|
|
nargs=iargc()
|
||
|
|
if(nargs.ne.5) then
|
||
|
|
print*,'Usage: jt4sim "message" [A-G] fspread SNR nfiles'
|
||
|
|
print*,'Example: jt4sim "CQ K1ABC FN42" F 200 -17 1'
|
||
|
|
go to 999
|
||
|
|
endif
|
||
|
|
|
||
|
|
call getarg(1,message)
|
||
|
|
call fmtmsg(message,iz)
|
||
|
|
call getarg(2,arg)
|
||
|
|
read(arg,*) submode
|
||
|
|
mode4=ichar(submode) - ichar('A') + 1
|
||
|
|
call getarg(3,arg)
|
||
|
|
read(arg,*) fspread !Frequency spread (Hz)
|
||
|
|
call getarg(4,arg)
|
||
|
|
read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
|
||
|
|
call getarg(5,arg)
|
||
|
|
read(arg,*) nfiles !Number of files
|
||
|
|
|
||
|
|
rmsdb=25.
|
||
|
|
rms=10.0**(0.05*rmsdb)
|
||
|
|
fsample=12000.d0 !Sample rate (Hz)
|
||
|
|
dt=1.d0/fsample !Sample interval (s)
|
||
|
|
twopi=8.d0*atan(1.d0)
|
||
|
|
npts=60*12000
|
||
|
|
sps=12000.d0/4.375d0 !2742.857...
|
||
|
|
f0=1000.d0 !Frequency of lowest tone (Hz)
|
||
|
|
|
||
|
|
h=default_header(12000,npts)
|
||
|
|
|
||
|
|
if(message(1:3).eq.'sin') read(message(4:),*) sinfreq
|
||
|
|
|
||
|
|
write(*,1000)
|
||
|
|
1000 format('File S/N Message'/ &
|
||
|
|
'--------------------------------')
|
||
|
|
|
||
|
|
call gen4(message,0,msgsent,itone,itype) !Encode message into tone #s
|
||
|
|
! write(*,1030) itone
|
||
|
|
!1030 format(/'Channel symbols'/(30i2))
|
||
|
|
|
||
|
|
|
||
|
|
do ifile=1,nfiles !Loop over all files
|
||
|
|
nmin=(ifile-1)*2
|
||
|
|
ihr=nmin/60
|
||
|
|
imin=mod(nmin,60)
|
||
|
|
write(fname,1002) ihr,imin !Create output filename
|
||
|
|
1002 format('000000_',2i2.2)
|
||
|
|
open(10,file=fname//'.wav',access='stream',status='unknown')
|
||
|
|
|
||
|
|
if(snrdb.lt.90) then
|
||
|
|
do i=1,npts
|
||
|
|
dat(i)=gran()
|
||
|
|
enddo
|
||
|
|
else
|
||
|
|
dat(1:npts)=0.
|
||
|
|
endif
|
||
|
|
|
||
|
|
snrdbx=snrdb
|
||
|
|
sig=10.0**(0.05*snrdbx)
|
||
|
|
if(snrdb.gt.90.0) sig=1.0
|
||
|
|
write(*,1020) ifile,snrdbx,msgsent
|
||
|
|
1020 format(i3,f7.1,2x,a22)
|
||
|
|
|
||
|
|
phi=0.
|
||
|
|
baud=12000.d0/sps
|
||
|
|
isym0=0
|
||
|
|
k0=12000
|
||
|
|
do k=k0+1,npts
|
||
|
|
isym=1.d0 + (k-k0)/sps
|
||
|
|
if(isym.gt.206) exit
|
||
|
|
if(isym.ne.isym0) then
|
||
|
|
freq=f0 + itone(isym)*baud*nch(mode4)
|
||
|
|
if(message(1:3).eq.'sin') freq=sinfreq
|
||
|
|
dphi0=twopi*freq*dt
|
||
|
|
dphi=dphi0
|
||
|
|
isym0=isym
|
||
|
|
endif
|
||
|
|
|
||
|
|
if(fspread.gt.0.d0 .and. mod(k,120).eq.0) then
|
||
|
|
call random_number(r)
|
||
|
|
f=freq + 0.5*fspread*(r(1)+r(2)-1.0)
|
||
|
|
dphi=twopi*f*dt
|
||
|
|
endif
|
||
|
|
|
||
|
|
phi=phi + dphi
|
||
|
|
if(phi.gt.twopi) phi=phi-twopi
|
||
|
|
xphi=phi
|
||
|
|
dat(k)=dat(k) + sig*sin(xphi)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
fac=32767.0
|
||
|
|
if(snrdb.ge.90.0) iwave(1:npts)=nint(fac*dat(1:npts))
|
||
|
|
if(snrdb.lt.90.0) iwave(1:npts)=nint(rms*dat(1:npts))
|
||
|
|
|
||
|
|
write(10) h,iwave(1:npts)
|
||
|
|
close(10)
|
||
|
|
|
||
|
|
enddo
|
||
|
|
|
||
|
|
999 end program jt4sim
|