The power needed for a raltime FFT display
of any value just does not exist for a typical
home computer. You would need a special
card like these high speed video cards.

I have seen the machines that do real time fft
and back in the 1970s they were like 1000X faster
than your home computer and would do 500 points
and be only a few milli seconds behind real time.

You most probably will have to stick
with after the fact processing.

those old machines were special purpose
and would have circuits built specifically
to work on each chosen freq.

So if you wanted 500 points there would be
500 seperate circuits for each chosen freq.

I suspect SETI is using the public
to do what those old expensive machines
used to do.

Maybe if you got a CRAY supercomputer
you might do real time ( HA! ) crunching.

Since we all live normally about 0.1 seconds behind
realtime anyway we all live in the past.
We never can see reality in real time.

Regards;
geoff
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