>If it is a fairly narrowband signal, centered on 50kHz, maybe you could mix
>it down to a lower frequency, say 1kHz, then do the processing, in the same
>way that a radio mixes the RF down to an IF where the gain/filtering stages
>are easier. As long as the "IF" is high enough that any side bands are
>preserved you should be OK.

This is an area in which I know enough to be dangerous, so no warranty on
the comments ...

If the signal is band limited, can't you simply subsample at a divisor of
the IF rate, thereby doing the mixing and A/D conversion in one step.


Jack

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