mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-16 09:01:59 -05:00
30 lines
616 B
Fortran
30 lines
616 B
Fortran
|
subroutine twkfreq_xy(c4aa,c4bb,n5,a)
|
||
|
|
|
||
|
|
complex c4aa(n5)
|
||
|
|
complex c4bb(n5)
|
||
|
|
real a(5)
|
||
|
|
complex w,wstep
|
||
|
|
data twopi/6.283185307/
|
||
|
|
|
||
|
|
! Apply AFC corrections to the c4aa and c4bb data
|
||
|
|
w=1.0
|
||
|
|
wstep=1.0
|
||
|
|
x0=0.5*(n5+1)
|
||
|
|
s=2.0/n5
|
||
|
|
do i=1,n5
|
||
|
|
x=s*(i-x0)
|
||
|
|
if(mod(i,1000).eq.1) then
|
||
|
|
p2=1.5*x*x - 0.5
|
||
|
|
! p3=2.5*(x**3) - 1.5*x
|
||
|
|
! p4=4.375*(x**4) - 3.75*(x**2) + 0.375
|
||
|
|
dphi=(a(1) + x*a(2) + p2*a(3)) * (twopi/1378.125)
|
||
|
|
wstep=cmplx(cos(dphi),sin(dphi))
|
||
|
|
endif
|
||
|
|
w=w*wstep
|
||
|
|
c4aa(i)=w*c4aa(i)
|
||
|
|
c4bb(i)=w*c4bb(i)
|
||
|
|
enddo
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine twkfreq_xy
|