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Additive synthesis? Korg Poly-800 & EX-800

 
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ranz



Joined: 21 Jun 2016
Posts: 13

PostPosted: Fri Mar 17, 2017 11:31 pm    Post subject: Additive synthesis? Korg Poly-800 & EX-800 Reply with quote

https://www.youtube.com/watch?v=3aztRABIO1g

^ This video I show how the oscillator generates these special waveforms called step waves. You can turn harmonics on/off at different feet intervals.

Is it additive synthesis?
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OpAmp
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Joined: 07 Jun 2013
Posts: 1173
Location: Brussels, BE

PostPosted: Sat Mar 18, 2017 12:48 am    Post subject: Reply with quote

Hi,

Thanks for sharing the video. It is an interesting synth with a synthesis approach I saw for the first time.

The set up of the DCO oscillator is indeed a kind of primitive additive synthesis. Primitive in the sense of: you can not have fine granularity over the amplitude and phase of the different steps. It is also only 4 steps.

Bye.
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ranz



Joined: 21 Jun 2016
Posts: 13

PostPosted: Sat Mar 18, 2017 1:16 am    Post subject: Reply with quote

Hi OpAmp,

Yes - very primitive and basic. I think Additive is more about combining sine waves - and as you said being able to have control over granularity.
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OpAmp
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PostPosted: Sat Mar 18, 2017 8:22 pm    Post subject: Reply with quote

Hi,

Indeed you are right. Additive synthesis typically uses sine waves.
But on the Poly800 you're adding squares, so it is additive Smile But hey, a square wave on itself can also be seen as a sum of sines Very Happy
The nice thing about the squares is that, although there are only 4 stops to play with on the synth, the resulting waveform has quite a number of harmonics. Playing with only 4 sinewaves would sound a bit thin.

Have fun.
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