[sdiy] Analysis of frequency variation in analogue synths

[Nicholas Gregorich]

On May 3, 2007, at 7:50 AM, Ian Fritz wrote:

> At 11:31 PM 5/2/2007, Nicholas Gregorich wrote:
>
>>  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.
>
> Could you please say what you base that statement on? Thank you.
>
>   Ian

Sorry if I have offended you.

The only thing I found suspect was the crystal oscillator simply from  
experience of them behaving less than ideally in a digital setting  
[possibly operator error/learning] and wondering how to measure the  
variations with temperature, noise, by pass capacitor effects, etc. I  
guess I could probably find something useful on the data sheet. :)

Combining that with Paul Perry's comment, I would be back at one  
wondering how to measure the accuracy of my FM discriminator.

Back to the crystal comment, some people pay big money for a nice  
clock to run their DAW off of, which I mentioned a few posts back, is  
this snake oil? What are the effects of jitter in the clock of a  
delta sigma converter? People claim night and day differences between  
internal and external DAW clocks, but is this true?

Nick.