[time-nuts] Question about SoundCard stability?

[jimlux]

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.