mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-01 16:13:57 -04:00
31 lines
714 B
Fortran
31 lines
714 B
Fortran
|
subroutine spec9f(id2,npts,nsps,s1,jz,nq)
|
||
|
|
|
||
|
|
! Compute symbol spectra at quarter-symbol steps.
|
||
|
|
|
||
|
|
integer*2 id2(0:npts)
|
||
|
|
real s1(nq,jz)
|
||
|
|
real x(960)
|
||
|
|
complex c(0:480)
|
||
|
|
equivalence (x,c)
|
||
|
|
|
||
|
|
nfft=2*nsps !FFTs at twice the symbol length
|
||
|
|
nh=nfft/2
|
||
|
|
do j=1,jz
|
||
|
|
ia=(j-1)*nsps/4
|
||
|
|
ib=ia+nsps-1
|
||
|
|
if(ib.gt.npts) exit
|
||
|
|
x(1:nh)=id2(ia:ib)
|
||
|
|
x(nh+1:)=0.
|
||
|
|
call four2a(x,nfft,1,-1,0) !r2c
|
||
|
|
k=mod(j-1,340)+1
|
||
|
|
do i=1,NQ
|
||
|
|
s1(i,j)=1.e-10*(real(c(i))**2 + aimag(c(i))**2)
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
|
||
|
|
!### Reference spectrum should be applied here (or possibly earlier?) ###
|
||
|
|
!### Normalize so that rms (or level?) is 1.0 ? ###
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine spec9f
|