WSJT-X/lib/genwave.f90

53 lines
1.1 KiB
Fortran
Raw Normal View History

subroutine genwave(itone,nsym,nsps,nwave,fsample,hmod,f0,icmplx,cwave,wave)
real wave(nwave)
complex cwave(nwave)
integer hmod
integer itone(nsym)
logical ex
real*8 dt,phi,dphi,twopi,freq,baud
dt=1.d0/fsample
twopi=8.d0*atan(1.d0)
baud=fsample/nsps
! Calculate the audio waveform
phi=0.d0
if(icmplx.le.0) wave=0.
if(icmplx.eq.1) cwave=0.
k=0
do j=1,nsym
freq=f0 + itone(j)*hmod*baud
dphi=twopi*freq*dt
do i=1,nsps
k=k+1
if(icmplx.eq.1) then
cwave(k)=cmplx(cos(phi),sin(phi))
else
wave(k)=sin(phi)
endif
phi=phi+dphi
if(phi.gt.twopi) phi=phi-twopi
enddo
enddo
!### TEMPORARY code to allow transmitting both A and B submodes
inquire(file='Q65_Tx2',exist=ex)
if(ex) then
k=0
do j=1,nsym
freq=f0 + itone(j)*2.d0*hmod*baud + 500.d0
dphi=twopi*freq*dt
do i=1,nsps
k=k+1
wave(k)=0.5*(wave(k)+sin(phi))
phi=phi+dphi
if(phi.gt.twopi) phi=phi-twopi
enddo
enddo
endif
!###
return
end subroutine genwave