[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.

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