Pitch Shifter on Ax8

spiderWAW said:
Is it true for Axe FX II too?
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The AxeFX has more processing power and works better on the pitch shifter. Even in AX8, there is a noticeable difference in the pitch shifter performance if you have 40% CPU usage or if you have 80% CPU usage.
 
bdrepko said:
I don't think there is a solution. It is a hardware limitation. I try to keep the CPU usage below 65% if I am using the pitch shifter.
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The Kemper uses a single Freescale processor running at 400 Mhz vs the AX8 using two dual-core 450 MHz ADSP-21469s DSPs.

I don't think it's a hardware limitation.
 
benvigil said:
The Kemper uses a single Freescale processor running at 400 Mhz vs the AX8 using two dual-core 450 MHz ADSP-21469s DSPs.

I don't think it's a hardware limitation.
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You're absolutely right - the perceived hardware limitation is only due to a sub-par and CPU-hungry algorithm. As I mentioned earlier TC could do this in the 90's on far inferior DSP's.

(Not trying to slam, don't know priorities, just saying the hardware is plenty for better pitchsh.)
 
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benvigil said:
The Kemper uses a single Freescale processor running at 400 Mhz vs the AX8 using two dual-core 450 MHz ADSP-21469s DSPs.

I don't think it's a hardware limitation.
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Not sure you can compare like that. Profiling is a completely different process than modeling. The pitch shift works well until the CPU reaches a certain utilization value.
 
Winther said:
You're absolutely right - the perceived hardware limitation is only due to a sub-par and CPU-hungry algorithm. As I mentioned earlier TC could do thi in the 90's on far inferior DSP's.

(Not trying to slam, don't know priorities, just saying the hardware is plenty for better pitchsh.)
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Not sure what improvements could be made to get better pitch shifting. Maybe there is room. But to make a statement that the code is sub-par seems a little arrogant.
 
bdrepko said:
Not sure what improvements could be made to get better pitch shifting. Maybe there is room. But to make a statement that the code is sub-par seems a little arrogant.
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Maybe too harsh but I mean relatively sub-par. Relative to awesome amp models and relative to incredible reverbs and delays. Relative to having DSP power that TC couldn't have even imagined 10% of in their craziest feverish wet nirvana dreams back when they already did better.
Axe's pitch seems sub-par relative to its own general effects standard, eh... and probably hasn't been a top priority. :)

Edit: TC probably had too much latency back then but otherwise very effective algorithms.
 
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So what is currently the best alternative to the Fractal Pitch shifting? Eventide H9 or TC Sub n Up or something else?
 
Don't forget : any digital system will need at least one half-wave of the incoming signal to detect its frequency plus the time it takes to synthesize the pitch transposed signal. The detection of the low E will require at least 1.5 msec.
 
Is that also true, if you are just changing the pitch by a fixed amount, say half step down? Does AX8 need to know, what the pitch is in order to transpose it?
 
pauliusmm said:
yeah, but that one needs a 13 pin out and is very bulky.
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like I said, cumbersome........the hardware unit is bigger than the AX8..HOWEVER, you can get this system self contained in a guitar..I believe Dweezil put one inside one of his FZ Roxy SGs, and I have a very sweet (literally..from Sweetwood Guitars..)prototype I bought off the NAMM floor .
http://sweetwoodguitars.com/studio-pro.cfm
(the video of Nicky Moroch playing at NAMM he is using my guitar that I had already purchased, but
glen wanted to walk it around the floor and got that video......
 
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