The major advantage of simply sampling at 192K is that it is so simple. Not much hardware outside of a good audio interface is required.
But the mixer is attractive because then you can make it a quadrature mixer and then sample with both stereo channels. One then could use a more common 44.1 or 48K sample rate. You trade a bit of hardware up front for reduced processing requirements later. On Thu, Mar 15, 2012 at 12:38 AM, Peter Monta <[email protected]> wrote: >> Many A/D converter systems use a sample and hold before the A/D converter. >> If you do the same before your sound card (your A/D converter) and drive the >> S&H with an audio output from your sound >> card, say at 6.1 kHz you would get a 1 kHz signal into your sound card to >> process. You can call it under sampling >> aliasing or whatever. > > Yes, this would work, but instantaneous sampling would tend to alias > in many harmonics, requiring good prefiltering at RF (if you can call > 60 kHz RF). Just as easy would be a mixer from CMOS switches, driven > say at 50 kHz to get 10 kHz into the sound card. > > The WWVB signal apparently has a double-sided bandwidth of about 1200 > Hz (not clear from the paper if that means 3 dB bandwidth or something > else). To get all of the signal something like 2 or 3 kHz might be > safest, requiring an IF of several kHz at least. > > Cheers, > Peter > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
