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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
FM input vs Pitch mod input
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AngusHastie



Joined: Aug 04, 2004
Posts: 136
Location: London, England
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PostPosted: Sat Dec 10, 2005 7:50 am    Post subject: FM input vs Pitch mod input
Subject description: What's the difference?
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Can someone tell me what the difference is between an FM input and a pitch mod input (on a filter, for example - aren't pitch and frequency the same thing?)
Thanks
Angus
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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
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PostPosted: Sat Dec 10, 2005 8:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes pitch is the same as frequency indeed, it's in how the mod. signals are processed internally.

From the G2 editor's online help file :
Quote:

FM stands for Frequency Modulation and is a method for adding harmonic and inharmonic frequencies to a sound by modulating its frequency with another signal. A signal routed to an FM input on a module affects the pitch by modulating it linearly in the frequency scale as opposed to Pitch modulation where you modulate the frequency in the note scale. The difference in frequency between carrier and modulator wave determines the density of partials in the sound. The level of the modulator wave determines the total bandwidth of the sound.



The practical result of FM is often a "metallic" or "bell" type of sound. The most common wave to do FM on is a pure sine wave, but any type of waveform can be used, both as modulator and carrier (wave to be modulated). Complex waveforms will generate more frequencies than simpler waves.

I hope this clears it up a bit.

For small modulation amounts the difference is not that big, but for larger modulation depths it's very distinctive. I's best to experiment a bit with this - maybe using the FM workshop from http://www.clavia.se/nordmodular/Modularzone/index.html as a guide.

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mosc
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PostPosted: Sat Dec 10, 2005 8:16 am    Post subject: Reply with quote  Mark this post and the followings unread

As usual, Blue Hell is right, but to elaborate:

Exponential response (pitch on the Nord Modulars) is typical of the analog modulars (such as the Moog Modulars) which worked on the 1 volt per octave scale. The FM input (linear) is typical of the FM synths first espoused by John Chowning and then popularized by the infamous Yamaha DX7.

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Blue Hell
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Location: The Netherlands, Enschede
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PostPosted: Sat Dec 10, 2005 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
but to elaborate:


Well well :-)
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AngusHastie



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PostPosted: Sat Dec 10, 2005 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys. I have been ploughing through some old SoundOnSound synth secrets articles to try to understand what I'm doing a bit more (until now, it has really just been trial and error or taking other people's patches that had the basics of a sound I wanted and seeing how they got it).
It's now a process of reading the introduction, skipping the mathematics and reading the conclusion paragraph! Then testing it with some simple constructions on the G2.
I find it's sort of like wine tasting in a way; line up a load of bottles and I can easily taste the difference between them all - the trick is finding a way to remember what causes the differences and remembering which flavour/sound goes with which grape/buildling block.
Like I said, sort of.... Very Happy
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mosc
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PostPosted: Sun Dec 11, 2005 7:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

There are few masters. Fortunately, you don't need to be a master to make great patches.
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