mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-15 16:42:12 -05:00
87 lines
2.3 KiB
Fortran
87 lines
2.3 KiB
Fortran
|
subroutine gen24(message,mode4,samfac,ntxdf,iwave,nwave,sendingsh,msgsent,nmsg)
|
||
|
|
|
||
|
|
! Encode a JT4 message into a wavefile.
|
||
|
|
|
||
|
|
parameter (NMAX=60*11025) !Max length of wave file
|
||
|
|
character*22 message !Message to be generated
|
||
|
|
character*22 msgsent !Message as it will be received
|
||
|
|
character*3 cok !' ' or 'OOO'
|
||
|
|
real*8 t,dt,phi,f,f0,dfgen,dphi,pi,twopi,samfac,tsymbol
|
||
|
|
integer*2 iwave(NMAX) !Generated wave file
|
||
|
|
integer sendingsh
|
||
|
|
integer dgen(13)
|
||
|
|
integer*1 data0(13),symbol(216)
|
||
|
|
logical first
|
||
|
|
include 'prcom2.f'
|
||
|
|
data first/.true./
|
||
|
|
save
|
||
|
|
|
||
|
|
nsym=207 !Symbols per transmission
|
||
|
|
if(first) then
|
||
|
|
do i=1,nsym
|
||
|
|
pr2(i)=2*npr2(i)-1
|
||
|
|
enddo
|
||
|
|
pi=4.d0*atan(1.d0)
|
||
|
|
twopi=2.d0*pi
|
||
|
|
first=.false.
|
||
|
|
endif
|
||
|
|
|
||
|
|
call chkmsg(message,cok,nspecial,flip)
|
||
|
|
call packmsg(message,dgen) !Pack 72-bit message into 12 six-bit symbols
|
||
|
|
call entail(dgen,data0)
|
||
|
|
call unpackmsg(dgen,msgsent)
|
||
|
|
|
||
|
|
nbytes=(72+31+7)/8
|
||
|
|
call encode(data0,nbytes,symbol(2)) !Convolutional encoding
|
||
|
|
symbol(1)=0 !Reference phase
|
||
|
|
sendingsh=0
|
||
|
|
if(iand(dgen(10),8).ne.0) sendingsh=-1 !Plain text flag
|
||
|
|
call interleave24(symbol(2),1) !Apply JT4 interleaving
|
||
|
|
|
||
|
|
! Set up necessary constants
|
||
|
|
tsymbol=2520.d0/11025.d0
|
||
|
|
dt=1.d0/(samfac*11025.d0)
|
||
|
|
f0=118*11025.d0/1024 + ntxdf
|
||
|
|
dfgen=11025.d0/2520 !4.375 Hz
|
||
|
|
t=0.d0
|
||
|
|
phi=0.d0
|
||
|
|
j0=0
|
||
|
|
ndata=(nsym*11025.d0*samfac*tsymbol)/2
|
||
|
|
ndata=2*ndata
|
||
|
|
do i=1,ndata
|
||
|
|
t=t+dt
|
||
|
|
j=int(t/tsymbol) + 1 !Symbol number, 1-207
|
||
|
|
if(j.ne.j0) then
|
||
|
|
f=f0 + (npr2(j)+2*symbol(j)-1.5) * dfgen * mode4
|
||
|
|
if(flip.lt.0.0) f=f0+((1-npr2(j))+2*symbol(j)-1.5)*dfgen*mode4
|
||
|
|
dphi=twopi*dt*f
|
||
|
|
j0=j
|
||
|
|
endif
|
||
|
|
phi=phi+dphi
|
||
|
|
iwave(i)=32767.0*sin(phi)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
do j=1,5512 !Put another 0.5 sec of silence at end
|
||
|
|
i=i+1
|
||
|
|
iwave(i)=0
|
||
|
|
enddo
|
||
|
|
nwave=i
|
||
|
|
|
||
|
|
if(flip.lt.0.0) then
|
||
|
|
do i=22,1,-1
|
||
|
|
if(msgsent(i:i).ne.' ') goto 10
|
||
|
|
enddo
|
||
|
|
10 msgsent=msgsent(1:i)//' OOO'
|
||
|
|
endif
|
||
|
|
do i=22,1,-1
|
||
|
|
if(msgsent(i:i).ne.' ') goto 20
|
||
|
|
enddo
|
||
|
|
20 nmsg=i
|
||
|
|
|
||
|
|
! write(*,3002) (symbol(i),i=1,207)
|
||
|
|
! 3002 format(70i1)
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine gen24
|
||
|
|
|