Func Shaper 2 octaves up rectifying

[RunBeerRun]

Can Func Shaper do a 2 octaves up rectify? I'm trying to modify the squarer patch, I can get a more intense octave up.

Tried adding multiplication after it, that just killed the signal.

[Dozius]

You'd need to remove the DC offset introduced by the first rectification and the rectify again. You could chain this together yourself. There is no way to double rectify a signal in one shot that I'm aware of, maybe Robin knows a way.

[Music Engineer]

Can Func Shaper do a 2 octaves up rectify? I'm trying to modify the squarer patch, I can get a more intense octave up.

Tried adding multiplication after it, that just killed the signal.

mmmh...rectifying for pitch shifting? maybe you would be better off with chebychev polynomials instead of rectifiying here - and as you mentioned squaring, you probably are already on this track. maybe try cheby(x,2); for one octave up and cheby(x,4); for two octaves up - this will give the desired pitch shifts for unit amplitude sinusoids at the input. ...and maybe something interesting for other signals. what effect exactly are you trying to achieve?

[RunBeerRun]

Cheby (x,2) is one octave up, (x,4) is still one. I'm using a guitar, for the Octavia style octave up rectify effect.

[Music Engineer]

Cheby (x,2) is one octave up, (x,4) is still one. I'm using a guitar, for the Octavia style octave up rectify effect.

can you describe this effect for someone unfamiliar with the original unit? that cheby(x,4) is the same as cheby(x,2) is weird. might be a bug. did the curve on the display change?

[Music Engineer]

OK, here is some preset which rectifies, subtracts some offset for DC compensation and rectifies again (and subtracts something again):

www.rs-met.com/temp/RectifyTwice.xml

dunno, if that is what you want.

[RunBeerRun]

It's still one octave up, you need to multiply after the original rectify, I made a vst like this in Synthedit.

I can't really explain anything, I just load rectify module-high pass filter-multiply-rectify and it's 2-up.

[Dozius]

I can't really explain anything, I just load rectify module-high pass filter-multiply-rectify and it's 2-up.

That's exactly what I was talking about. Rectify, dc blocking, gain compensation, rectify again. It's the only way to really do what you want. Double rectifying the original signal isn't the same.

[Music Engineer]

I can't really explain anything, I just load rectify module-high pass filter-multiply-rectify and it's 2-up.

That's exactly what I was talking about. Rectify, dc blocking, gain compensation, rectify again. It's the only way to really do what you want. Double rectifying the original signal isn't the same.

he's probably right. i tried to subtract *something* in order to compensate the DC, but that something (0.5 in this case) is only right for certain signals. for general signals, the something has to be signal dependent - which calls for a highpass filter. and that highpass is not expressable in the formule editor

[RunBeerRun]

Cool, thanks for the info.

[RunBeerRun]

I love the sound of 2 octaves up, I just made a plug in Synthmaker using it, same forumula, but the rectifiers were multipliers with the input going into it twice.

[Music Engineer]

I love the sound of 2 octaves up, I just made a plug in Synthmaker using it, same forumula, but the rectifiers were multipliers with the input going into it twice.

in this case, you are actually not rectifying but squaring the signal. a squarer can be seen as a special case of a polynomial waveshaper. scaling the output by a factor of two and subtracting one (y = 2*x^2-1) will not qualitatively change the output, but you will then have the second order chebychev polynomial. for double rectifying/squaring/cheby-shaping, i think you can also use two Func-Shapers in series - just make sure that the first in chain has it's output filter active and adjust it's highpass' cutoff to taste.

[RunBeerRun]

Cool, I chained 2funcs and it's 2-up! I didn't know squaring wasn't rectifying, all I know is the end result.