[sdiy] Oscillator sync schemes

[Dave Manley]

Tom Wiltshire wrote:
>
> "In Soft Sync, rather than resetting to zero, the wave is inverted; 
> that is, its direction is reversed."
>
> Inversion isn't the same as reversing the wave's direction. Imagine a 
> sine wave that has just gone 'over the top' and is beginning to head 
> back down towards zero. Reversing it would make it start to climb back 
> towards its maximum value. Inverting it would make it close to its 
> maximum negative value, heading up towards zero.
I think the reference here is to a triangle core vco as opposed to a 
ramp core.  Some sync circuits cause the integration circuit in the 
tirangle core to reverse direction.  I've seen this referred to soft sync.

-Dave