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Linear Frequency Synthesizer

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Linear Frequency Synthesizer

Postby Hexo » Mon Sep 17, 2018 2:17 pm

Hello everybody;

I'm looking for a plugin or app that allows me to increase frequency with constant Hz per seconds. This is for a psychological test and I tested several synths and oscillator plug-ins like Ableton Operator, Melda Production Moscillator and more, but they look to have a non linear curve in the frequency domain. i.e. if you draw a linear envelope to modulate the frequency knob, it won't change linearly. Looks like they have kinds of internal curves pre-applyed to their knobs.

Any comments are highly appreciated.
Regards,
Ahmad Hasanabadi.
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Re: Linear Frequency Synthesizer

Postby Wonks » Mon Sep 17, 2018 2:26 pm

Probably because as the frequency increases, it takes longer and longer to get to the next note. 1kHz to 2kHz is one octave, but then so is 2kHz to 4kHz and then 4kHz to 8kHz.

So most sweeps are set for a logarithmic increase so that it takes the same time to sweep up (or down) each semitone or octave.
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Re: Linear Frequency Synthesizer

Postby Hexo » Mon Sep 17, 2018 2:28 pm

Wonks wrote:Probably because as the frequency increases, it takes longer and longer to get to the next note. 1kHz to 2kHz is one octave, but then so is 2kHz to 4kHz and then 4kHz to 8kHz.

So most sweeps are set for a logarithmic increase so that it takes the same time to sweep up (or down) each semitone or octave.

That's absolutely true, but is there a way to spare this?
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Re: Linear Frequency Synthesizer

Postby Wonks » Mon Sep 17, 2018 8:59 pm

I'm afraid I have no idea. You may have to write your own software or script an instrument in NI Reaktor.
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Re: Linear Frequency Synthesizer

Postby molecular » Tue Sep 18, 2018 11:57 am

If you're up for explaining the experiment, I'd be interested to hear why you'd want to do this. If you are trying to achieve a smooth, clean sweep through the frequencies that sounds "right", I would imagine the logarithmic one is what you'd be after, and a sweep that took as long to get from 10k - 20k as it had from 20 - 20k would sound "wrong".

I realise I have no idea what you're up to, though, and you will have reasons. Just curious!
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Re: Linear Frequency Synthesizer

Postby Hugh Robjohns » Tue Sep 18, 2018 1:39 pm

Adobe Audition's tone generator can be switched between log (default) and linear (option) frequency sweeps.

H
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Re: Linear Frequency Synthesizer

Postby ken long » Wed Sep 19, 2018 12:51 pm

I might be missing something but why not automate your own sweep?
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Re: Linear Frequency Synthesizer

Postby LimitedHeadroom » Tue Oct 02, 2018 11:02 pm

It would be very easy to make something to do this in Max. I'd be happy to throw together a patch to do this for you, it would only take a few minutes. You can run it in the demo without limitations, it functions as a runtime. Let me know if you want me to knock something up.
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