[sdiy] Moogey jitter

[Ian Fritz]

At 02:58 PM 4/16/06, René Schmitz wrote:

>>Conclusion:  Any phase beating effects are going to occur over longer 
>>time scales due to drifting and wandering, not the bogus phase jitter 
>>that Kevin claims.
>
>Absolutely.
>
>But there is a problem with denominations here. I'd call this frequency 
>fluctuations. Or like Magnus: wandering, quicker than drift, but slower 
>than jitter. (You might even think of drift and jitter being the same 
>thing, it merely depends on the timescales on which you observe.)

Sure. Very important to specify in terms of time scale.  The original 
motivation here was to look at the time scale -- under 1 sec -- that 
Kevin's video was showing fluctuations.  That's what Kenneth's file was 
made to study.


>And I don't see how small fluctuations of momentary frequency away from 
>the average frequency would not change the beating pattern. Provided the 
>frequency of these fluctuations is low enough, that an effect can 
>accumulate over these timescales (several seconds).
>Kenneth's sample is too short IMO to really be useful in analysing that.

Of course.  But did you ever try to tune one oscillator to another in less 
than 2 sec?  :-)

If I could have tuned more accurately and looked at smaller fluctuations, 
sure I would have seen an effect.  But when it is so miniscule ...

   Ian




>Cheers,
>  René
>
>--
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>