Hi What does the signal you are sampling look like?
Does it (maybe) have a bit of noise on it? If it is the output of a “normal” TDC, then the answer is to sample once. Bob > On Oct 5, 2016, at 7:45 PM, Nick Sayer via time-nuts <[email protected]> > wrote: > > This is tangentially on topic, I suppose. It’s for my GPSDO. > > I notice periodically that the phase measurements seem “noisy.” You can see > that over the course of several seconds the value doesn’t change, then it > jumps a bunch and then comes right back. > > My theory at the moment is that sampling the ADC multiple times in a row > might help, but then what’s the best way to (quickly) pick which sample to > use? > > The mean would allow a bad sample undue influence. > > At the moment, I’ve coded taking 3 samples, averaging them and picking the > sample that is closest to the mean. If I’m right, and two of the samples > happen to be very close to each other and a third is an outlier, then that > seems like it would eliminate it. > > I guess what I want is the mode, but with 3 samples, that’s going to be > poorly defined (if at all). > > Anyone have any suggestions (besides a larger sample size)? > _______________________________________________ > 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. _______________________________________________ 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.
