Are there any Spectral/Additive EQs that can boost frequencies that aren’t present in the signal?

[Local Man]

What I’m imagining is an EQ that uses additive synthesis to boost frequencies that are above (or maybe also below) what is present in the signal based on the frequency content of what is. For example you have a sound that has a steep cutoff at about 500hz and very little information above that but you would like to add some frequency content in the 2k to 4K range, then this EQ would generate frequencies in that area that are harmonically related to the fundamental of the sound that is present. So you can boost octaves or even or odd harmonics or whatever other customizations.
Does this kind of thing exist?

And to be clear, I am not talking about those automatic, make it sound good gizmos like gulfoss and zynaptiq’s intensity and that kind of thing. I’m talking about being able to target specific frequency ranges like a normal EQ.

[adl]

Maybe have a look at Wavesfactory Spectre:
https://www.wavesfactory.com/audio-plugins/spectre/

[Local Man]

Maybe have a look at Wavesfactory Spectre:
https://www.wavesfactory.com/audio-plugins/spectre/

That looks like it might be able to do a similar kind of trick but in a very different way. Not sure it how dramatic and focused the results would be but it definitely looks interesting on its own terms.
It looks like it’s just a multi-band exciter with a paragraphic EQ workflow. Which is a pretty cool idea!

[MogwaiBoy]

I love Spectre for what it does, but it sounds like you want very precise control of targeted frequencies and subsequent harmonics produced from those frequencies - and Spectre isn't *that* sophisticated.

Maybe...





Or something else in the Melda lineup?

Zynaptiq do go pretty deep on spectral synthesis - I only have Adaptiverb though so I don't know.

[Tj Shredder]

If you boost something which isn’t there, it still doesn’t appear. You first need to add it.
One technique which does this is an exciter, for example the first one was the Aural Exciter. The technique behind it is distortion. You add harmonics based on lower frequencies which are present in the signal. With distortion/waveshaping you also create all sorts of cross modulated artifacts you need to tame with filters. Not trivial...
For monophonic signals its easier, and there are tools wich analyze the pitch and then resynthesize with that information. Pitch to Midi to Synth...

[andrelafosse]

Voxengo TEOTE ftw!

[fairlyclose]

If you boost something which isn’t there, it still doesn’t appear. You first need to add it.
One technique which does this is an exciter, for example the first one was the Aural Exciter. The technique behind it is distortion. You add harmonics based on lower frequencies which are present in the signal. With distortion/waveshaping you also create all sorts of cross modulated artifacts you need to tame with filters. Not trivial...
For monophonic signals its easier, and there are tools wich analyze the pitch and then resynthesize with that information. Pitch to Midi to Synth...

I was playing with this today to see if I could come up with something for the OP - I tried harmonisers and resonators and pitchshifters with various distortions and filters. The results were not all that great - ok using something like ElastiquePitch V2 where formants and pitch can be played with. One of the problems is getting a decent simple envelope for the added material, another is picking which frequencies one wants, and as you mention getting the eq right is not trivial. A fun excursion but not how I would handle a problem like this in my own work. I would be much more likely to layer another instrument or sound to fill whatever part of the spectrum I thought was missing

[Tj Shredder]

I think I heard about some AI based techniques to add to dull sounds missing highs. But can’t remember where. That could be an option on “normal” music. (The network needs to be trained with existing standard music...)

[plexuss]

Voxengo TEOTE ftw!

I wouldn't say TEOTE as much as Shinechilla https://www.voxengo.com/product/shinechilla

Applications

• Strong harmonic coloration
• Radical timbre changing
• Spectral saturation
• Sound design
• Stereo, mid-side, 5.1 surround plugin

Voxengo Shinechilla is an experimental creative sound effect AAX, AudioUnit and VST plugin for professional sound and music production applications. Shinechilla allows you to generate and blend 2nd, 3rd and 4th harmonics with the original dry sound. The harmonic generation process offered by Shinechilla is quite unique on the plugin market since it produces almost no intermodulation distortion.

Shinechilla is mainly usable for solo instrument processing where it literally “shines” by producing convincing and full-bodied harmonic coloration. Shinechilla is also unique in that it is able to add harmonic coloration on top of the sound instead of distorting the whole sound. However, the option to saturate the whole sound is also available.

The strength of harmonic coloration added by Shinechilla can be flexibly adjusted over the whole frequency range, for each harmonic. In overall, Shinechilla is a great tool for contemporary electronic music producers and sound designers looking for impressive timbres and sounds.

[Bouroki]

Toneboosters enhancer