'Perfect' Bands?

monobass · Posted: Fri Jun 02, 2006 6:11 am Post subject: 'Perfect' Bands?

Hello all,

I've been trying to achieve something this morning, to accurately split a signal into 3 distinct bands of frequency, Bass, Mid and Hi.

My aim being that when these 3 bands are summed they sound identical to the original. This much I have achieved in the patch attached.

The modulation wheel is controlling the green fade module which at it's low value lets you hear the original, at it's highest value let's you hear the sum of the three distinct bands. They sound identical.

I created the bands in this sequence:

'Bass' = lo pass on Original
'Mid & Hi' = Original + Inv 'Bass'
'Hi' = hi pass on 'Mid & Hi'
Mid = 'Mid & Hi' + Inv 'Hi'

But if you start to change the balance of the three distinct bands (yellow module) you will start to hear artifacts and phase effects, which I presume are due to the way the EQ modules work or due to sample delay issues.

Is there a more accurate way to do this band seperation?
Is this where we come into the realms of the 'allpass' filter?

Thanks

Steve

3 Band Test Steve.prf2

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3 Band Test Steve.prf2

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paul e. · Posted: Fri Jun 02, 2006 8:19 pm Post subject:

are you hearing comb filtering effects perhaps...? just taking a guess...but if so, then that would be pretty hard to avoid

monobass · Posted: Sat Jun 03, 2006 2:32 am Post subject:

Kassen · Posted: Sat Jun 03, 2006 4:41 pm Post subject:

Probably there are many ways but problems in this field tend to involve very hard math. Just this afternoon I saw some equations involving complex numbers (those aren't all that bad, at least I understand the concept) and mathematical signs I never saw before (that always means trouble).

I'm nowhere near a G2 editor right now but 10% sounds like a lot, that probably means something is wrong. This effect in general is simply something you may have to live with or switch to FIR filtes (which would likely be on a computer). I recomend doing what most eq desigener seem to do; pick settings that sound reasonable for most realistic applications.

Jason · Posted: Sat Jun 03, 2006 5:30 pm Post subject:

interesting stuff.
But why is this a performance out of curiousity and not just a patch?

monobass · Posted: Sat Jun 03, 2006 5:34 pm Post subject:

Jason · Posted: Sat Jun 03, 2006 5:57 pm Post subject:

Right on! Just wondering, I havent really made perfs.

Tim Kleinert · Posted: Sun Jun 04, 2006 3:22 am Post subject:

Isn't it this what you are looking for?

monobass · Posted: Sun Jun 04, 2006 12:48 pm Post subject:

jksuperstar · Posted: Sun Jun 04, 2006 4:05 pm Post subject:

I just downloaded & opened, ok for me.

monobass · Posted: Sun Jun 04, 2006 4:28 pm Post subject: