[sdiy] Oscillator sync schemes

[HARRY BISSELL]

Soft Syne (imho) should be described as

"the oscillator responds to a external reset pulse only when that pulse
arrives within a small (perhaps adjustable) window of time
BEFORE the internal reset pulse

H^) harry



----- Original Message -----
From: Tom Wiltshire <tom at electricdruid.net>
To: Ian Fritz <ijfritz at comcast.net>
Cc: synthdiy DIY <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 17 Aug 2009 11:14:01 -0400 (EDT)
Subject: Re: [sdiy] Oscillator sync schemes


On 17 Aug 2009, at 15:39, Ian Fritz wrote:

>
>>> Then there's soft sync - it's quite undescribed. What are different
>>> ways of doing 'soft sync'?
>>>
>>> What are other ways of doing synchronization between two (or more)
>>> oscillators?
>>
>>
>> IMHO not the last conclusion on this topic but also a start:   
>> http://en.wikipedia.org/wiki/Oscillator_sync
>
> IMO, that article is pretty limited in scope.

I agree, Ian. There's one or two things in it which seem distinctly  
dubious:

"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.

T.

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