basic (aka stupid) question about oscillator sync

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ianjhicks
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basic (aka stupid) question about oscillator sync

Post by ianjhicks » Fri Dec 28, 2007 5:17 am

Can someone explain to me the difference between hard and soft sync?

danks

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Post by OriginalJambo » Fri Dec 28, 2007 5:48 am

I could be wrong, but I think this is the difference:

In hard sync the slave oscillator is set to restart when the master finishes its cycle.

In soft sync the slave oscillator's waveform is inverted when the master finishes its cycle.

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Post by Dirk » Fri Dec 28, 2007 6:08 am

OriginalJambo wrote:I could be wrong, but I think this is the difference:

In hard sync the slave oscillator is set to restart when the master finishes its cycle.

In soft sync the slave oscillator's waveform is inverted when the master finishes its cycle.
Exactly right.

The result is that with hardsync the synced ocsillator alway's has the same root frequency as the master oscillator. With softsync the synced oscillator will alway's be a harmonic of the root frequency of the master oscillator, and that frequency can also be a subharmonic of the root of the master oscillator.
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Post by V301H » Fri Dec 28, 2007 7:17 am

I remember when I first discovered the hard-sync on my Odyssey back in 1973. I was so amazed at the almost human voice-like sound it produced. The next time I heard that sound is when the Cars came out with "Let's Go" a few years later.

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Post by Bitexion » Fri Dec 28, 2007 6:35 pm

Here's heavy theory on the subject of soft and hard sync:

http://www.clavia.se/nordmodular/Modula ... story.html

No analog oscillator ever came with a softsync input. Only hardsync. Soft sync must be created using other tricks.

You can generally say that soft sync sounds less rough than the sharp, raspy hard sync. But they are really two very different concepts.

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Post by esqoner » Fri Dec 28, 2007 7:00 pm

that is not a stupid question.

don't bash yourself!!

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Post by ianjhicks » Fri Dec 28, 2007 7:57 pm

thanks for the link bitexion, interesting read!

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Post by Huppo » Fri Dec 28, 2007 8:49 pm

esqoner wrote:that is not a stupid question.

don't bash yourself!!
Seriously! I just learned something new. Thanks for asking the question.
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Post by Dirk » Sat Dec 29, 2007 12:02 am

Bitexion wrote:Here's heavy theory on the subject of soft and hard sync:

http://www.clavia.se/nordmodular/Modula ... story.html

No analog oscillator ever came with a softsync input. Only hardsync. Soft sync must be created using other tricks.

You can generally say that soft sync sounds less rough than the sharp, raspy hard sync. But they are really two very different concepts.
I don't think you have completely understood the article you posted.
My System 100 has both hard and softsync and my A6 to, both are analog synths. It depends on the type of vco used, only 1 type can do softsync and both types can do hardsync.
See the quote from Rob Hordijk's article:
The other type of oscillator mentioned, the one that generates square-triangle waveforms at the same time also uses a capacitor, but this capacitor is not shunted. After the charging reaches a maximum level the charging current is reversed and the capacitor is discharged in the same rate as that it is charged, resulting in the triangle waveform. The charge/discharge signal results in the square waveform. Now we have two possibilities. We can still shunt the capacitor with an extra shuntcircuit, enabling hardsync. But we can also force the oscillator to toggle the charge/discharge state. This forces the triangle waveform to reverse it’s direction. This is called ‘soft’-sync and sounds distincly different from hard-sync. E.g. hardsync can generate a strong transient in a synced trianglewave on the syncing moment, but softsync will by itself not add such a strong transient. So it sounds smoother.
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Post by carbon111 » Sat Dec 29, 2007 12:53 am

Bitexion wrote:No analog oscillator ever came with a softsync input. Only hardsync.
The oscillators on the Serge Modular do softsync only.

(Hardsync-type sounds must be achieved via Wave Multipliers or DSG syncing.)
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Post by meatballfulton » Sat Dec 29, 2007 1:01 am

Bitexion wrote:No analog oscillator ever came with a softsync input. Only hardsync. Soft sync must be created using other tricks.
PAiA's 9720 VCO has soft sync but not hard sync. I'm not sure how it's implemented.
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Post by Dirk » Sat Dec 29, 2007 9:21 am

carbon111 wrote:
Bitexion wrote:No analog oscillator ever came with a softsync input. Only hardsync.
The oscillators on the Serge Modular do softsync only.

(Hardsync-type sounds must be achieved via Wave Multipliers or DSG syncing.)
It's an eazy mod to hardsync them. Read the quote from my previous post.
meatballfulton wrote: PAiA's 9720 VCO has soft sync but not hard sync. I'm not sure how it's implemented.
Again read the quote from my previous post.
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Post by insky » Sat Dec 29, 2007 10:12 am

carbon111 wrote:
Bitexion wrote:No analog oscillator ever came with a softsync input. Only hardsync.
The oscillators on the Serge Modular do softsync only.

(Hardsync-type sounds must be achieved via Wave Multipliers or DSG syncing.)
The JX-8P has both soft and hard syncing...I'm not exactly sure how Roland did it but it's still (semi) analog.
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Post by Dirk » Sat Dec 29, 2007 4:08 pm

insky wrote:I'm not exactly sure how Roland did it but it's still (semi) analog.
See previous post.

:mumum:
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Post by insky » Sun Dec 30, 2007 1:14 am

Dirk wrote:
insky wrote:I'm not exactly sure how Roland did it but it's still (semi) analog.
See previous post.

:mumum:

Yeah, somehow I completly missed it when I was reading this. I saw it after I posted though. :oops:
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