[time-nuts] Commercial software defined radio for clock metrology

Hal Murray hmurray at megapathdsl.net
Sat May 28 01:58:35 UTC 2016


bruce.griffiths at xtra.co.nz said:
> All the filtering and down mixing is done in the digital domain.
> Anitialiasing filters in front of the ADCs are also be required. 

What sort of bandwidth is expected?

The usual trick with audio ADCs is to have a low cost analog filter that 
does't have a sharp corner but lets everything you want through, sample at a 
high rate - say 16x, run that through a digital filter with a sharp cutoff, 
then decimate down to the desired sample rate.

-- 
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