[sdiy] jitter analysis

[Fredrik Carlqvist]

Hello!

 

I am glad you enjoyed my work!

 

Jörg, no, sampling at 44100Hz will not be accurate enough. Most of the
jitter is less than the 22us resolution of the sound card. But it is of
course good enough to measure the sequencer accuracy. 

 

Mark and others, I will try to measure all synthesizers I can lay my hands
on, but I will not build VCOs that I have no use for. One of the reasons I
am doing this is that I think VCOs like Bergfors’ are too accurate to be
musically interesting. For example, the DB-9 CEM3340 VCO is, in my opinion,
too accurate.

 

Glen, Yes the SH-1000 was my first synth as well. I love it. By organ core,
I mean it uses a binary divider with several steps and then add different
overtones together to create the timbres. So the SH-1000 VCO runs up to 32
times faster than the actual pitch played. I think this is a good synthesis
method. It also has several types of formant filters and the traditional VCF
with a beautiful resonance. 

 

Harry, I cannot see if the jitter is cyclic or not. I could modify the
software to save an entire measurement cycle. It would be interesting, since
my hypothesis is that it doesn’t matter if the jitter is cyclic or not for
this application. 

 

 

Fredrik C 

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