[sdiy] OT:Running stand alone autotune

[Joe Frey]

Thanks. That what I wanted to know. Easier to buy...

Richie Burnett wrote:
> Do you mean Vocal Autotune like used on Cher's song "Believe" (and 
> countless others since!)?  Or something to automatically tune an 
> instrument before a performance, more like a guitar tuner?
>
> Real-time autotune of an audio input is very computationally intensive 
> because it uses an algorithm called Autocorrelation (or AMDF) to 
> determine the actual pitch of the audio input.  Only then can it can 
> calculate the pitch error and finally shift the incoming audio to the 
> nearest correct pitch on whatever scale it's set to work with.  The 
> original patent in Harold Hildebrand's name is available on the net 
> and gives an overview of Antares Autotune operation, but many of the 
> details are glossed over as you might expect in a disclosure like this.
>
> Autocorrelation is something that DSPs really excel at, so I'd be 
> surprised if you could get real-time autotune to run on a Raspberry Pi 
> without needing a lot of in-depth assembly optimisation of SIMD 
> instructions or whatever the equivalent is on an R-Pi.  I think the 
> original Autotune patent might have expired now, as there seem to be a 
> lot of copycat autotune pedals on the market now from companies like 
> Digitech, Electroharmonix, Eventide, etc. Your best bet would almost 
> certainly be to purchase one of these!
>
> -Richie,
>
>
>
> -----Original Message----- From: Joe Frey
> Sent: Tuesday, April 14, 2015 3:53 PM
> To: Synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] OT:Running stand alone autotune
>
> Hello, Is there someone on the list that would give me some advice on
> running a stand alone autotune in a box for live performances. Maybe on
> Raspberry Pi or something? Thanks. I really don't want to use a big
> computer and a daw. Is this do-able? Is there another different way?
>


-- 
    (">  <")
    / )   ( \
  ''/ |   / |``
  
"Anything worth doing, is worth doing badly, because it might make it better the next time." --anon

Joe Frey
A.K.A. Bitter Relic of a Bygone Era
joe.frey at radioles.com
http://radioles.com
Chez Judex
http://radioles.com/judex/
Radio Lu-Lu (Internet radio)
http://radioles.com/radiolulu/