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List:       rockbox-dev
Subject:    Re: iAudio X5 procesing power for pitch/tempo control?
From:       "Michael Sevakis" <jethead71 () sbcglobal ! net>
Date:       2007-03-17 2:51:28
Message-ID: 030c01c7683f$29966920$4401a8c0 () gateway ! 2wire ! net
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We have no time/pitch stretcher at the moment that can change just one or
the other but it could be done. The pitchscreen is just the same resampling
used to play different sample rate files. A Gigabeat would probably be able
to handle the highest quality methods. It's the most powerful player running
rockbox right now. Someone just has to implement it.

----- Original Message ----- 
From: "Jeroen Janssen" <jeroen.janssen@gmail.com>
To: <rockbox-dev@cool.haxx.se>
Sent: Friday, March 16, 2007 4:29 PM
Subject: iAudio X5 procesing power for pitch/tempo control?


> Hello,
>
> I was wondering if anyone can tell if the iAudio X5 has enough
> processing power (cpu + specialized audio chips on board) to perform
> the following actions in realtime:
>
> 1) pitch control (keeping tempo constant)
> 2) tempo control (keeping pitch constant)
>
> I play both bass and trombone and the reason why I'm interested in
> these features is:
>
> 1) original songs are sometimes transposed in order for 'our' singers
> to 'hit' the correct notes. This way you can practice an original
> recording in a different key (without preprocessing the files on a
> PC).
>
> 2) when practicing difficult phrases of a song, I want to rehearse
> (and play along) at a slower tempo. When it is ok, then I slightly
> increase the tempo until it's at the normal speed again.
>
> If this can't be done on an iAudio X5, is there a different (rockbox)
> device that could do this?
>
> My guess is that it would probably require dedicated DSP functionality
> to do this? So it's probably not going to be 'generic' for all
> supported rockbox platforms?
>
> Any thoughts on this?
>
> Best regards,
>
> Jeroen Janssen


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