[sdiy] waveform pics

[Tim Parkhurst]

> -----Original Message-----
> From: john mahoney [mailto:jmahoney at gate.net]
> Sent: Friday, October 22, 2004 8:51 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] waveform pics
> 
> 
> In a similar vein, Matthew Davidson just posted the following to
> Analogue Heaven:
> 
>     When developing MX4, I inspected the raw waves of a number of
> synths. After the exchange this morning, I dug up the original waves
> and with the magic of iPhoto, produced a web page that compares the
> waves of a Prophet 5, Minimoog, Voyager, Juno 106 and Doepfer standard
> osc.
>     Enjoy:
>     http://www.stretta.com/~matthew/resources/analog_waves/
> 
> --
> john
> 
> ---

Interesting. We had a thread several months back about what might make one
VCO sound better than another. Although no firm conclusions were reached
(especially since the preference is largely subjective), it was generally
thought that clean, well-defined waves with nice, linear slopes and crisp,
vertical 'resets' were the best and produced the widest range of harmonics.
Looking at these waveforms, I notice that the Mini Moog (and Voyager) tri /
saw waves have decidedly non-linear slopes! Lots of ringing and some bending
to the resets on the Mini square wave too. So, does a non-linear slope give
a markedly different set of harmonics than a linear slope? The Doepfer waves
seem to be the best 'looking', although I think few would argue that a
Doepfer VCO sounds better than a Mini. One factor to think about however:
I'm assuming the Doepfer waves came directly from the VCO, whereas the Mini
and Voyager waves were more than likely processed through the VCF. Even with
the filter wide open, it's still in the signal chain. Also, what's up with
the Juno? That has to be the saddest looking output I've ever seen. Anyway,
gonna have to try this with the Odyssey someday, and the CEM 3374 dual VCO
chip. 

Also, thanks to Matthew for posting/creating this, and John M for
cross-posting.


Tim (crisp and well-defined) Servo
 

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