mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-13 15:41:50 -05:00
22 lines
530 B
Fortran
22 lines
530 B
Fortran
|
subroutine ana932(dat,npts0,cdat,npts)
|
||
|
|
|
||
|
|
real dat(npts0)
|
||
|
|
complex cdat(262145)
|
||
|
|
|
||
|
|
n=log(float(npts0))/log(2.0)
|
||
|
|
nfft1=2**(n+1)
|
||
|
|
nfft2=9*nfft1/32
|
||
|
|
df932=11025.0/nfft1
|
||
|
|
fac=2.0/nfft1
|
||
|
|
do i=1,npts0/2
|
||
|
|
cdat(i)=fac*cmplx(dat(2*i-1),dat(2*i))
|
||
|
|
enddo
|
||
|
|
cdat(npts0/2+1:nfft1/2)=0.
|
||
|
|
call four2a(cdat,nfft1,1,-1,0) !Forward r2c FFT
|
||
|
|
call four2a(cdat,nfft2,1,1,1) !Inverse c2c FFT
|
||
|
|
npts=npts0*9.0/32.0 !Downsampled data length
|
||
|
|
npts2=npts
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine ana932
|