SV: [sdiy] Patching thru-zero oscillators from regular VCOs

[karl dalen]

--- Grant Richter <grichter at asapnet.net> skrev:

> There has been a lot of talk recently about "thru-zero" oscillators.

It has been a bit of a fashion word in the synth world for the past 2 years.
Perhaps it has escalated somewhat recently?
 
> These oscillators produce both positive and negative frequencies. In  
> practical terms a negative frequency is simply 180 degrees out of  
> phase relative to a positive frequency.
> 
> Some people think that linear FM produced with a thru-zero oscillator  
> sounds better than regular FM.
> If you want to test this for yourself, you can patch a thru-zero  
> oscillator on almost any wide range modular.
> The technique is quite simple, you need two sine wave VCOs and a ring  
> or balanced modulator. 

Its interesting you say this because i have found out that summing just 
a bunch of 2 quadrant modulators, for example 4VCO as and 4 quads will
sound as complex as if they where 3-4 zeros.It may seams a bit odd but
for example doing old pendulum clock sounds the 2 quad comes far closer
and natural sounding then what the zero produce or 4 quads. 2quads gives
carrier + sidebands.

> The most useful application of a thru-zero oscillator that I have  
> found is for quadraphonic panning. For this application, the thru- 
> zero core needs to produce quadrature trapezoid waveforms. The thru- 
> zero feature allows you to do "sound spinning" with smooth  
> transitions from clockwise to counter-clockwise rotation (slow down  
> and reverse direction, a good and useful thing).

The most interesting use i have found for THZ osc's are around 0 phasing
of carrier.Which performs better on a digital implementation anyhow.

KD


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