mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-05 08:51:19 -05:00
26 lines
502 B
Fortran
26 lines
502 B
Fortran
|
subroutine mixlpf(x1,nbfo,c0)
|
||
|
|
|
||
|
|
real*4 x1(512)
|
||
|
|
real*8 twopi,phi,dphi
|
||
|
|
complex c1(512),c2(105+512)
|
||
|
|
complex c0(64)
|
||
|
|
data phi/0.d0/
|
||
|
|
save phi,c2
|
||
|
|
|
||
|
|
twopi=8.d0*atan(1.d0)
|
||
|
|
dphi=twopi*nbfo/12000.d0
|
||
|
|
|
||
|
|
do i=1,512
|
||
|
|
phi=phi+dphi
|
||
|
|
if(phi.gt.twopi) phi=phi-twopi
|
||
|
|
xphi=phi
|
||
|
|
c1(i)=x1(i)*cmplx(cos(xphi),sin(xphi))
|
||
|
|
enddo
|
||
|
|
c2(106:105+512)=c1
|
||
|
|
|
||
|
|
call fil3c(c2,105+512,c0,n2)
|
||
|
|
c2(1:105)=c1(512-104:512) !Save 105 trailing samples
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine mixlpf
|