[sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator design

[Donald Tillman]

> On Sep 15, 2018, at 3:26 PM, ulfur hansson <ulfurh at gmail.com> wrote:
> 
> I love the way traditional triangle core oscillator sync sounds, and much prefer it to the harsher sawcore type sync.  with trianglecore sync (I hope I understand this correctly) the waveform changes sign at trigger points rather than doing a hard reset to 0v, right?

There are several way to sync a triangle wave.

The technically correct way would be to force the oscillator to the start of the waveform.  So if it's advertised as a sine wave, the sync pulse should bring it to 0V, ascending.

I'll claim that reversing the direction of the wave is not actually a sync.  The word "synchronize" means to bring an oscillator to the same frequency, and same phase, as another.  I don't think that's remotely possible by flipping the direction of the triangle every cycle.

I'd even call it "anti-sync".

But if it's an expressive sound, it's probably worth coming up with a better name.

  -- Don
--
Donald Tillman, Palo Alto, California
http://www.till.com