mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-09 02:26:06 -05:00
4f0e73f68f
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8398 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
50 lines
1.0 KiB
Fortran
50 lines
1.0 KiB
Fortran
subroutine wspr_wav(baud,xdt,h,f0,itone,snrdb,iwave)
|
|
|
|
! Generate iwave() from itone().
|
|
|
|
include 'wspr_params.f90'
|
|
integer itone(NN)
|
|
integer*2 iwave(NMAX)
|
|
real*8 twopi,dt,dphi0,dphi1,dphi,phi
|
|
real dat(NMAX)
|
|
|
|
twopi=8.d0*atan(1.d0)
|
|
dt=1.d0/12000.d0
|
|
baud=375.0/256.0
|
|
|
|
dat=0.
|
|
if(snrdb.lt.90) then
|
|
do i=1,NMAX
|
|
dat(i)=gran() !Generate gaussian noise
|
|
enddo
|
|
bandwidth_ratio=2500.0/6000.0
|
|
sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*snrdb)
|
|
else
|
|
sig=1.0
|
|
endif
|
|
|
|
phi=0.d0
|
|
k=nint(xdt/dt)
|
|
do j=1,NN
|
|
dphi=twopi*(f0+h*(itone(j)-1.5)*baud)*dt
|
|
do i=1,NSPS0
|
|
k=k+1
|
|
phi=mod(phi+dphi,twopi)
|
|
if(k.gt.0 .and. k.le.NMAX) dat(k)=dat(k) + sig*sin(phi)
|
|
enddo
|
|
enddo
|
|
|
|
rms=100.0
|
|
if(snrdb.lt.90.0) then
|
|
dat=rms*dat;
|
|
if(maxval(abs(dat)).gt.32767.0) print*,"Warning - data will be clipped."
|
|
else
|
|
datpk=maxval(abs(dat))
|
|
fac=32767.9/datpk
|
|
dat=fac*dat
|
|
endif
|
|
iwave=nint(dat)
|
|
|
|
return
|
|
end subroutine wspr_wav
|