mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-16 00:51:56 -05:00
bcb97a148a
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/jtms3@2525 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
52 lines
1.2 KiB
Fortran
52 lines
1.2 KiB
Fortran
subroutine setupmsk(cw,cwb)
|
|
|
|
! Calculate the JTMS character waveforms.
|
|
|
|
complex cw(168,0:63)
|
|
complex cwb(168)
|
|
integer nb(7)
|
|
! real*8 twopi,dt,f0,f1
|
|
character cc*64
|
|
! 1 2 3 4 5 6
|
|
! 0123456789012345678901234567890123456789012345678901234567890123
|
|
data cc/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ./?- _ @'/
|
|
|
|
nsps=24
|
|
twopi=8.d0*atan(1.d0)
|
|
dt=1.d0/48000.d0 !Sample interval
|
|
f0=1000.d0
|
|
f1=2000.d0
|
|
dphi0=twopi*dt*f0
|
|
dphi1=twopi*dt*f1
|
|
|
|
do i=0,63
|
|
k=0
|
|
m=0
|
|
do n=5,0,-1 !Each character gets 6+1 bits
|
|
k=k+1
|
|
nb(k)=iand(1,ishft(i,-n))
|
|
m=m+nb(k)
|
|
enddo
|
|
k=k+1
|
|
nb(k) = 1 - iand(m,1) !Insert odd parity bit
|
|
|
|
phi=0.
|
|
j=0
|
|
do k=1,7 !Generate the waveform
|
|
if(nb(k).eq.0) then
|
|
dphi=dphi0
|
|
else
|
|
dphi=dphi1
|
|
endif
|
|
do ii=1,nsps
|
|
j=j+1
|
|
phi=phi+dphi
|
|
cw(j,i)=cmplx(cos(phi),sin(phi))
|
|
enddo
|
|
enddo
|
|
enddo
|
|
cwb=cw(1:168,44)
|
|
|
|
return
|
|
end subroutine setupmsk
|