mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-26 06:08:42 -05:00
74 lines
2.1 KiB
Fortran
74 lines
2.1 KiB
Fortran
subroutine gen_fst280wave(itone,nsym,nsps,nwave,fsample,hmod,f0,icmplx,cwave,wave)
|
|
|
|
real wave(nwave)
|
|
complex cwave(nwave)
|
|
real, allocatable, save :: pulse(:)
|
|
real, allocatable :: dphi(:)
|
|
integer hmod
|
|
integer itone(nsym)
|
|
logical first
|
|
data first/.true./
|
|
save first,twopi,dt,tsym
|
|
|
|
if(first) then
|
|
allocate( pulse(3*nsps*fsample) )
|
|
twopi=8.0*atan(1.0)
|
|
dt=1.0/fsample
|
|
tsym=nsps/fsample
|
|
! Compute the smoothed frequency-deviation pulse
|
|
do i=1,3*nsps
|
|
tt=(i-1.5*nsps)/real(nsps)
|
|
pulse(i)=gfsk_pulse(2.0,tt)
|
|
enddo
|
|
first=.false.
|
|
endif
|
|
|
|
! Compute the smoothed frequency waveform.
|
|
! Length = (nsym+2)*nsps samples, zero-padded
|
|
allocate( dphi(0:(nsym+2)*nsps-1) )
|
|
dphi_peak=twopi*hmod/real(nsps)
|
|
dphi=0.0
|
|
do j=1,nsym
|
|
ib=(j-1)*nsps
|
|
ie=ib+3*nsps-1
|
|
dphi(ib:ie) = dphi(ib:ie) + dphi_peak*pulse(1:3*nsps)*itone(j)
|
|
enddo
|
|
|
|
! Calculate and insert the audio waveform
|
|
phi=0.0
|
|
dphi = dphi + twopi*(f0-1.5*hmod/tsym)*dt !Shift frequency up by f0
|
|
wave=0.
|
|
if(icmplx.eq.1) cwave=0.
|
|
k=0
|
|
do j=0,(nsym+2)*nsps-1
|
|
k=k+1
|
|
if(icmplx.eq.0) then
|
|
wave(k)=sin(phi)
|
|
else
|
|
cwave(k)=cmplx(cos(phi),sin(phi))
|
|
endif
|
|
phi=mod(phi+dphi(j),twopi)
|
|
enddo
|
|
|
|
! Compute the ramp-up and ramp-down symbols
|
|
if(icmplx.eq.0) then
|
|
wave(1:nsps/2)=0.0
|
|
wave(nsps/2+1:nsps)=wave(nsps/2+1:nsps) * &
|
|
(1.0-cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
|
|
k1=(nsym+1)*nsps+1
|
|
wave(k1+nsps/2:)=0.0
|
|
wave(k1:k1+nsps/2-1)=wave(k1:k1+nsps/2-1) * &
|
|
(1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
|
|
else
|
|
cwave(1:nsps/2)=0.0
|
|
cwave(nsps/2+1:nsps)=cwave(nsps/2+1:nsps) * &
|
|
(1.0-cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
|
|
k1=(nsym+1)*nsps+1
|
|
cwave(k1+nsps/2:)=0.0
|
|
cwave(k1:k1+nsps/2-1)=cwave(k1:k1+nsps/2-1) * &
|
|
(1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
|
|
endif
|
|
|
|
return
|
|
end subroutine gen_fst280wave
|