Sv: [sdiy] Digital VCO update

[clark at andrews.edu]

> Regarding waveforms, I think it would be really cool if you could
> include a table for a so-called "hypertriangle" wave.  This is a
> triangle that has a kind of exponential change in amplitude over
> time.

   I refer to this waveform as a Tangent wave, since if you look at a
mathematical tangent plot, it has that exact shape.

> I don't know if an inverted hypertriangle would also be useful (start
> ramping up fast, then slow down as you approach the peak).  So far,
> all the applications I have seen use one that starts ramping slow,
> gradually speeding up towards the peak.  Still, I have a hunch that
> there might be some good apps for the inverted one, too.

   The inverse of the above is pretty much a sine wave.

   On my modular VCO, I have waveshapers that make the Sine and Tangent
waveforms from the Triangle wave.  And basically the difference between
the two is the inversion of the shaping signal.  My version uses an OTA
for the waveshaper and is driven by a fullwave rectified triangle.

   Having the extra waveforms is definately nice!

   Cheers,

   Tony

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