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snoddas
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73 posts since 5 May, 2006, from Uppsala, Sweden

Postby snoddas; Mon Apr 23, 2018 1:07 am Synth/Effect that can subtract spectrum A from B in real time?

Hi folks,
Playing with ReaFir and enjoying building spectrums for eq:ing. Are there any vstis that can do the same thing, ie build/load a spectrum B and subtract B from other spectrum A. Any basic vst that can hold multiple spectrum B:s so one could choose/play different B:s to subtract from A? Sort of like an 'inverted' vocoder.
Anything similar of interest!
Regards,
/S
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whyterabbyt
Beware the Quoth
 
25997 posts since 3 Sep, 2001, from R'lyeh Oceanic Amusement Park and Funfair

Postby whyterabbyt; Mon Apr 23, 2018 2:37 am Re: Synth/Effect that can subtract spectrum A from B in real time?

The thing about an impulse response is that it is effectively subtracting from the effected signal's spectrum. The way it basically works is that only the frequencies the IR and the signal have in common remain, the rest are lost. The ones that remain are 'multiplied', so the spectrum of the IR is 'superimposed' on the signal.

(The inverse of an IR would be [1-IRn] for each sample n of the IR, he says off the top of his head without thinking about it properly)

Not sure of which convolvers can switch IRs on the fly, its a heavy process so there's a latency involved. I guess one option is could stack up multiple convolvers in a host like Bidule, though, and change which one you're routing to on the fly.
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Mushy Mushy
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9592 posts since 6 Sep, 2008

Postby Mushy Mushy; Mon Apr 23, 2018 3:00 am Re: Synth/Effect that can subtract spectrum A from B in real time?

Isn’t this simply a case of AM and automating the volume of osc 2?

EDIT: :dog: You're referring to EQ not synthesis.
Last edited by Mushy Mushy on Mon Apr 23, 2018 7:17 am, edited 1 time in total.
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Steve1974
KVRist
 
33 posts since 13 Sep, 2014, from Moscow, Russia

Postby Steve1974; Mon Apr 23, 2018 6:46 am Re: Synth/Effect that can subtract spectrum A from B in real time?

Maybe Thorn by Dmitry Sches?
It has Harmonic Filter.
Sorry for my bad English. I'm not a native speaker.
yellowmix
KVRian
 
637 posts since 10 Aug, 2012

Postby yellowmix; Mon Apr 23, 2018 7:15 am Re: Synth/Effect that can subtract spectrum A from B in real time?

Well, unless you're dead-set on using FIR for EQing, consider the more CPU-friendly IIR method with something like Trackspacer from Wavesfactory.
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snoddas
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73 posts since 5 May, 2006, from Uppsala, Sweden

Postby snoddas; Mon Apr 23, 2018 12:27 pm Re: Synth/Effect that can subtract spectrum A from B in real time?

Thanks fir ( :o ) the input. I'll look into the suggestions and see if they lead anywhere useful. I tried out the thorn synth for a one synth challenge and was impressed.
/S
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Tj Shredder
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776 posts since 6 Jan, 2017, from Outer Space

Postby Tj Shredder; Mon Apr 23, 2018 2:29 pm Re: Synth/Effect that can subtract spectrum A from B in real time?

A modular built vocoder should do it, you have to invert the spectrum which is applied to the carrier... Maybe in the reaktor library is something like that...
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snoddas
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73 posts since 5 May, 2006, from Uppsala, Sweden

Postby snoddas; Mon Apr 23, 2018 3:36 pm Re: Synth/Effect that can subtract spectrum A from B in real time?

[quote="Tj Shredder"]A modular built vocoder should do it, you have to invert the spectrum which is applied to the carrier... Maybe in the reaktor library is something like that...[/quote]
So you would invert the modulator signal before feeding it to the vocoder? And the vocoder would need quite a few bands.
Chandlerhimself
KVRian
 
745 posts since 19 Dec, 2013, from Japan

Postby Chandlerhimself; Mon Apr 23, 2018 6:35 pm Re: Synth/Effect that can subtract spectrum A from B in real time?

I believe the convolution mode in MPowersynth’s OSC will do this.
counterparty
KVRist
 
116 posts since 21 Jul, 2016

Postby counterparty; Mon Apr 23, 2018 8:42 pm Re: Synth/Effect that can subtract spectrum A from B in real time?

Do you mean something like WavesFactory Track Spacer? It functions like a multi-band EQ that removes the frequencies of a sidechain track from the track it's applied to.
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Tj Shredder
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776 posts since 6 Jan, 2017, from Outer Space

Postby Tj Shredder; Tue Apr 24, 2018 5:04 am Re: Synth/Effect that can subtract spectrum A from B in real time?

snoddas wrote:
Tj Shredder wrote:A modular built vocoder should do it, you have to invert the spectrum which is applied to the carrier... Maybe in the reaktor library is something like that...

So you would invert the modulator signal before feeding it to the vocoder? And the vocoder would need quite a few bands.

It has to be flipped around some arbitrary level, the places where a frequency would be boosted, you lower it and vice versa. This is something to experiment with. Basically you are asking for a filter controlled by a signal...
I think in Bitwig you could patch something like that together...
aumordia
KVRist
 
260 posts since 16 Jun, 2015

Postby aumordia; Tue Apr 24, 2018 9:51 am Re: Synth/Effect that can subtract spectrum A from B in real time?

harmor
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