[sdiy] Analysis of frequency variation in analogue synths

[Nicholas Gregorich]

On Apr 30, 2007, at 11:31 PM, Magnus Danielson wrote:

>
> The topic of weither the jitter & wander aspects is part of the  
> "analog" or
> "fattness" has been debated here and elsewhere to death before. I  
> still
> consider that issue unsettled. There are parties that argue for the  
> case that
> it is or it isn't jitter & wander related. Personally I advocate  
> the point that
> it *might* be phase modulations or for that matter amlitude  
> modulations (I
> wonder if the ear makes the distinction at lower modulations  
> rates). I have
> not seen any conclusive evidence that it is or it isn't. This have  
> been beaten
> to death here before, I'm just trying to refer to the issues.
>
> There is much more to be said about this, but I gotta run.
>
> Cheers,
> Magnus

Lots of interesting information there, thanks. I thought I read all  
of the Moogy jitter posts but I saw some unread I will go check out.

I realize its been debated a lot, and I don't think Tom or I was  
trying to heat the debate. What we both seem to be after is finding  
the conclusive evidence you mention.

My concern is measuring jitter of a signal and not knowing how how  
much is being injected/caused by the measurement device. It seems  
like the methods mentioned today by Ian and Paul are not robust  
enough to conclude what is going on with PM/FM on a VCO.

Nick.