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 Forum index » Clavia Nord Modular » G2 Building Blocks
Constant Pulse Time Oscillator
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1140
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236

PostPosted: Sat Sep 09, 2017 3:39 pm    Post subject: Constant Pulse Time Oscillator
Subject description: Inspired by the NordLead A1
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Hi,

Was shopping around for a compact, easy-to-use and great sounding synth to bring to jam sessions, and picked up a NLA1. A rare example of less really being more. Can totally recommend it.

Among the many oscillator waveforms, it also features constant pulse time, where formants created by the adjustable pulse width remain constant over the pitch range. It's one of those features which prove to be far more useful than one would initially assume.

On the G2 one could do it the DIY route (and thus also provide sine and triangle versions like on the NLA1), but that would be more laborious and DSP-expensive. A pulse wave version however can be had comparatively cheaply, simply with a stock G2 OscB module and lin-expo conversion to keep the pulse width constant.

cheers,
t


ConstPulseOsc_TK.pch2
 Description:
Constant pulse time oscillator, inspired by the NordLead A1

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 Filename:  ConstPulseOsc_TK.pch2
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Sat Sep 09, 2017 6:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Interesting idea .. could extend it to other wave shapes too I guess ... just like PWM can be extended to apply to say a sine (making the wave asymmetric).

Do you know what the pulse time range is? (as when the pulse would go too long some odd things would happen for higher frequencies - or maybe interesting .. dunno).

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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1140
Location: Zürich, Switzerland
Audio files: 7
G2 patch files: 236

PostPosted: Sun Sep 10, 2017 2:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
Interesting idea .. could extend it to other wave shapes too I guess ...

The NLA1 has pulse, triangle and sine, yes. It's basically one constant-time waveform cycle followed by a period of silence according to frequency.

Blue Hell wrote:
Do you know what the pulse time range is? (as when the pulse would go too long some odd things would happen for higher frequencies - or maybe interesting .. dunno).

With sine or triangle it isn't so clear-cut (will have to check on the NLA1). With pulse one can simply go past 50/50 duty cycle to get another octave of range. At least that's what I did here. I put in a clipper module however so that the pulse width doesn't go into total silence as one goes up in pitch.
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