WSJT-X/wsjtgen.f90

228 lines
5.4 KiB
Fortran
Raw Normal View History

subroutine wsjtgen
! Compute the waveform to be transmitted.
! Input: txmsg message to be transmitted, up to 28 characters
! samfacout fsample_out/11025.d0
! Output: iwave waveform data, i*2 format
! nwave number of samples
! sendingsh 0=normal; 1=shorthand (FSK441) or plain text (JT65)
parameter (NMSGMAX=28) !Max characters per message
parameter (NSPD=25) !Samples per dit
parameter (NDPC=3) !Dits per character
parameter (NWMAX=60*11025) !Max length of waveform
parameter (NTONES=4) !Number of FSK tones
integer itone(84)
character msg*28,msgsent*22,idmsg*22
real*8 freq,pha,dpha,twopi,dt
character testfile*27
logical lcwid
integer*2 icwid(110250)
integer*1 hdr(44)
integer*2 nfmt2,nchan2,nbitsam2,nbytesam2
character*4 ariff,awave,afmt,adata
common/hdr/ariff,lenfile,awave,afmt,lenfmt,nfmt2,nchan2, &
nsamrate,nbytesec,nbytesam2,nbitsam2,adata,ndata
equivalence (ariff,hdr)
data twopi/6.28318530718d0/
include 'gcom1.f90'
include 'gcom2.f90'
fsample_out=11025.d0*samfacout
lcwid=.false.
if(idinterval.gt.0) then
n=(mod(int(tsec/60.d0),idinterval))
if(n.eq.(1-txfirst)) lcwid=.true.
if(idinterval.eq.1) lcwid=.true.
endif
msg=txmsg
ntxnow=ntxreq
! Convert all letters to upper case
do i=1,28
if(msg(i:i).ge.'a' .and. msg(i:i).le.'z') &
msg(i:i)= char(ichar(msg(i:i))+ichar('A')-ichar('a'))
enddo
txmsg=msg
! Find message length
do i=NMSGMAX,1,-1
if(msg(i:i).ne.' ') go to 10
enddo
i=1
10 nmsg=i
nmsg0=nmsg
if(msg(1:1).eq.'@') then
if(msg(2:2).eq.'/' .or. ichar(msg(2:2)).eq.92) then
if(msg(2:).ne.testfile) then
testfile=msg(2:)
#ifdef Win32
open(18,file=testfile,form='binary',status='old',err=12)
#else
open(18,file=testfile,form='unformatted',status='old',err=12)
#endif
go to 14
12 print*,'Cannot open test file ',msg(2:)
go to 999
14 read(18) hdr
if(ndata.gt.NTxMax) ndata=NTxMax
nwave=ndata
call rfile(18,iwave,2*nwave,ierr)
close(18)
if(ierr.ne.0) print*,'Error reading test file ',msg(2:)
endif
go to 999
endif
! Transmit a fixed tone at specified frequency
freq=1000.0
if(msg(2:2).eq.'A' .or. msg(2:2).eq.'a') freq=882
if(msg(2:2).eq.'B' .or. msg(2:2).eq.'b') freq=1323
if(msg(2:2).eq.'C' .or. msg(2:2).eq.'c') freq=1764
if(msg(2:2).eq.'D' .or. msg(2:2).eq.'d') freq=2205
if(freq.eq.1000.0) then
read(msg(2:),*,err=1) freq
goto 2
1 txmsg='@1000'
nmsg=5
nmsg0=5
endif
2 nwave=60*fsample_out
dpha=twopi*freq/fsample_out
do i=1,nwave
iwave(i)=32767.0*sin(i*dpha)
enddo
goto 900
endif
dt=1.d0/fsample_out
LTone=2
if(mode(1:4).eq.'JT65') then
! We're in JT65 mode.
if(mode(5:5).eq.'A') mode65=1
if(mode(5:5).eq.'B') mode65=2
if(mode(5:5).eq.'C') mode65=4
call gen65(msg,mode65,samfacout,iwave,nwave,sendingsh,msgsent)
if(lcwid) then
! Generate and insert the CW ID.
wpm=25.
freqcw=800.
idmsg=MyCall//' '
call gencwid(idmsg,wpm,freqcw,samfacout,icwid,ncwid)
k=nwave
do i=1,ncwid
k=k+1
iwave(k)=icwid(i)
enddo
do i=1,2205 !Add 0.2 s of silence
k=k+1
iwave(k)=0
enddo
nwave=k
endif
goto 900
endif
if(mode(1:4).eq.'Echo') then
! We're in Echo mode.
! dither=AmpA
! call echogen(dither,wavefile,nbytes,f1)
! AmpB=f1
goto 900
endif
if(mode(1:4).eq.'JT6M') then
! We're in JT6M mode.
call gen6m(msg,samfacout,iwave,nwave)
goto 900
endif
if(mode(1:2).eq.'CW') then
! We're in CW mode
wpm=15.
freqcw=800.
call gencw(msg,wpm,freqcw,samfacout,TRPeriod,iwave,nwave)
goto 900
endif
! We're in FSK441 mode.
if(nmsg.lt.28) nmsg=nmsg+1 !Add trailing blank if nmsg < 28
! Check for shorthand messages
sendingsh = 0
if(shok.eq.1 .and. nmsg.le.4) then
if (msg(1:3).eq.'R26') then
msg='++'
nmsg=2
sendingsh = 1
else if (msg(1:3).eq.'R27') then
msg='**'
nmsg=2
sendingsh = 1
else if (msg(1:3).eq.'RRR') then
msg='%%'
nmsg=2
sendingsh = 1
else if (msg(1:2).eq.'73') then
msg='@@'
nmsg=2
sendingsh = 1
endif
endif
! Encode the message
call abc441(msg,nmsg,itone,ndits)
ndata=ndits*nspd
! Generate iwave
k=0
df=11025.0/NSPD
do m=1,ndits
j=itone(m)
freq=(LTone-1+itone(m))*df
dpha=twopi*freq*dt
do i=1,NSPD
k=k+1
pha=pha+dpha
iwave(k)=nint(32767.0*sin(pha))
enddo
enddo
nwave=k
900 sending=txmsg
if(mode(1:4).eq.'JT65' .and. sendingsh.ne.1) sending=msgsent
nmsg=nmsg0
if(lcwid .and. (mode.eq.'FSK441' .or. mode(1:4).eq.'JT6M')) then
! Generate and insert the CW ID.
wpm=25.
freqcw=440.
idmsg=MyCall//' '
call gencwid(idmsg,wpm,freqcw,samfacout,icwid,ncwid)
k=0
do i=ncwid+1,int(trperiod*fsample_out)
k=k+1
if(k.gt.nwave) k=k-nwave
iwave(i)=iwave(k)
enddo
do i=1,ncwid
iwave(i)=icwid(i)
enddo
nwave=trperiod*fsample_out
endif
999 return
end subroutine wsjtgen