[time-nuts] Question about SoundCard stability?
jimlux
jimlux at earthlink.net
Thu Oct 14 05:30:45 UTC 2010
Jim Lux wrote:
> That's not precisely true. You can get a frequency estimate that is substantially more precise than 1/T if the snr is high. Consider super-resolution in an interferometer which is mathematically similar. What you give up is ambiguity. Probably one of the oldest techniques is that of Prony, but there are lots of others
>
Or, now that I think about it, it's similar to what we do when measuring
ADEV.. you can do a crude "how many zero crossings in the time window"
or you can do a "fit a sinusoid to a series of ADC samples". One has an
uncertainty of "one count/epoch", the other can be substantially better.
More information about the time-nuts
mailing list